The following tables present IEM computed monthly data summaries based on
daily data provided by or computed for the IEM. A download interface
exists for the daily summary information. The climatology is provided by the
nearest NCEI climate station (USC00388188) within the current 1991-2020
dataset.
To load shown data into Microsoft Excel,
highlight the table information with your mouse and then copy/paste into Excel.
Precipitation Totals [inch]
Year
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
1930
M
M
M
M
M
M
M
M
M
M
M
M
1931
M
M
M
M
M
M
M
M
M
M
M
M
1932
M
M
M
M
M
M
M
M
M
M
M
M
1933
M
M
M
M
M
M
M
M
M
M
M
M
1934
M
M
M
M
M
M
M
M
M
M
M
M
1935
M
M
M
M
M
M
M
M
M
M
M
M
1936
M
M
M
M
M
M
M
M
M
M
M
M
1937
M
M
M
M
M
M
M
M
M
M
M
M
1938
M
M
M
M
M
M
M
M
M
M
M
M
1939
M
M
M
M
M
M
M
M
M
M
M
M
1940
M
M
M
M
M
M
M
M
M
M
M
M
1941
M
M
M
M
M
M
M
M
M
M
M
M
1942
M
M
M
M
M
M
M
M
M
M
M
M
1943
M
M
M
M
M
M
M
M
M
M
M
M
1944
M
M
M
M
M
M
M
M
M
M
M
M
1945
M
M
M
M
M
M
M
M
M
M
M
M
1946
M
M
M
M
M
M
M
M
M
M
M
M
1947
M
M
M
M
M
M
M
M
M
M
M
M
1948
3.65
3.42
8.11
2.23
3.92
2.94
2.22
3.89
5.60
1.26
9.17
4.49
1949
3.16
5.98
2.02
5.70
3.11
4.27
5.39
8.92
2.91
9.53
2.12
1.82
1950
3.20
1.23
3.41
1.12
3.87
1.90
4.20
1.79
3.06
3.56
0.85
3.57
1951
1.65
2.21
5.13
4.74
0.86
5.09
1.65
1.67
8.36
0.96
2.67
6.93
1952
3.99
4.47
10.33
3.82
1.95
3.97
4.36
7.23
1.64
0.74
1.23
4.04
1953
5.07
6.24
4.69
2.79
2.86
3.09
2.49
1.37
4.84
0.50
1.03
6.35
1954
6.82
2.30
6.81
1.71
2.36
1.14
1.60
0.89
0.13
0.22
4.15
3.03
1955
2.70
3.99
2.19
7.77
3.97
3.47
7.05
4.35
1.67
3.23
3.03
0.69
1956
1.40
8.80
4.55
6.42
4.80
2.23
3.96
2.69
6.80
2.21
2.71
3.14
1957
3.79
4.11
3.67
2.77
5.42
3.38
1.71
1.89
8.23
2.52
8.89
2.54
1958
4.58
3.26
4.25
9.79
2.17
2.24
9.20
4.68
0.69
1.47
1.82
3.75
1959
2.24
2.96
4.66
5.65
4.96
3.02
5.20
4.66
9.17
9.55
1.86
2.92
1960
5.55
6.32
4.28
2.43
1.99
4.60
1.71
6.61
6.80
5.94
0.52
3.14
1961
2.44
7.71
4.04
4.91
3.11
9.89
5.54
9.82
0.52
0.56
2.73
9.65
1962
5.22
4.86
9.79
5.76
1.22
10.96
1.40
3.27
4.63
1.40
M
M
1963
M
M
M
M
M
M
M
M
M
M
M
M
1964
M
M
M
M
M
M
M
M
M
M
M
M
1965
M
M
M
M
M
M
M
M
M
M
M
M
1966
M
M
M
M
M
M
M
M
M
M
M
M
1967
M
M
M
M
M
M
M
M
M
M
M
M
1968
M
M
M
M
M
M
M
M
M
M
M
M
1969
M
M
M
M
M
M
M
M
M
M
M
M
1970
M
M
M
M
M
M
M
M
M
M
M
M
1971
M
M
M
M
M
M
M
M
M
M
M
M
1972
M
M
M
M
M
M
M
M
M
M
M
M
1973
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
1974
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
1975
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
1976
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
1977
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
1978
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
1979
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
1980
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
1981
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
M
M
M
1982
M
M
M
M
M
M
M
M
M
M
M
M
1983
M
M
M
M
M
M
M
M
M
M
M
M
1984
M
M
M
M
M
M
M
M
M
M
M
M
1985
M
M
M
M
M
M
M
M
M
M
M
M
1986
M
M
M
M
M
M
M
M
M
M
M
M
1987
M
M
M
M
M
M
M
M
M
M
M
M
1988
M
M
M
M
M
M
M
M
M
M
M
M
1989
M
M
M
M
M
M
M
M
M
M
M
M
1990
M
M
M
M
M
M
M
M
M
M
M
M
1991
M
M
M
M
M
M
M
M
M
M
M
M
1992
M
M
M
M
M
M
M
M
M
M
M
M
1993
M
M
M
M
M
M
M
M
M
M
M
M
1994
M
M
M
M
M
M
M
M
M
M
M
M
1995
M
M
M
M
M
M
M
M
M
M
M
M
1996
M
M
M
M
M
M
M
M
M
M
M
M
1997
M
M
M
M
M
M
M
M
M
M
M
M
1998
M
M
M
M
M
M
M
M
M
M
M
M
1999
M
M
M
M
M
M
M
M
M
M
M
M
2000
M
M
M
M
M
M
M
M
M
M
M
M
2001
M
M
M
M
M
M
M
M
M
M
M
M
2002
M
M
M
M
M
M
M
M
M
M
M
M
2003
M
M
M
M
M
M
M
M
M
M
M
M
2004
M
M
M
M
M
M
M
M
M
M
M
M
2005
M
M
M
M
M
M
M
M
M
M
M
M
2006
M
M
M
M
M
M
M
M
M
M
M
M
2007
M
M
M
M
M
M
M
M
M
M
M
M
2008
M
M
M
M
M
M
M
M
M
M
M
M
2009
M
M
M
0.00
0.04
1.39
0.28
0.01
0.02
0.00
3.12
5.55
2010
4.34
2.10
2.14
1.21
3.29
1.25
1.29
3.86
0.91
0.17
0.09
0.52
2011
1.02
3.10
4.48
2.45
2.33
5.04
1.30
2.68
3.73
1.24
3.29
1.80
2012
1.68
1.20
2.58
2.49
3.51
1.17
1.48
4.12
2.92
1.75
0.44
4.16
2013
4.06
2.51
2.16
1.11
0.03
0.11
0.00
1.14
2.91
0.82
2.76
5.45
2014
3.14
1.42
3.59
1.93
2.10
3.54
1.84
0.97
1.91
1.62
3.14
2.41
2015
2.60
2.29
1.71
4.96
2.04
2.17
3.63
1.48
3.69
5.74
7.77
7.74
2016
2.59
2.78
2.37
1.69
4.23
0.68
0.87
0.11
0.85
0.29
0.33
2.14
2017
2.34
1.04
3.85
5.42
4.50
4.05
1.26
3.45
2.81
1.47
0.07
2.07
2018
2.14
3.70
3.31
4.98
7.63
3.18
2.30
0.72
2.76
5.37
5.72
7.30
2019
3.79
5.03
2.72
3.12
2.07
3.54
2.35
3.43
0.30
3.37
2.41
5.02
2020
4.75
7.09
2.80
6.68
7.52
2.14
0.82
4.99
3.99
4.11
5.15
2.64
2021
3.78
3.93
4.44
1.52
2.49
2.73
2.40
3.13
2.54
3.48
0.72
2.24
2022
4.08
5.37
8.26
5.22
2.15
1.10
3.65
0.30
2.87
1.24
5.37
3.50
2023
5.33
2.29
2.30
7.24
2.25
1.30
0.28
3.70
0.68
0.72
1.00
5.03
2024
7.68
2.01
5.85
1.81
3.93
1.78
5.82
6.82
3.03
0.30
2.33
2.98
2025
1.53
3.55
2.04
3.62
5.11
1.78
0.03
M
M
M
M
M
NCEI Climatology
4.34
3.91
4.81
4.29
3.92
4.58
3.97
4.56
3.65
3.93
3.72
4.70
Average Wind Speed [MPH]
Year
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
1930
M
M
M
M
M
M
M
M
M
M
M
M
1931
M
M
M
M
M
M
M
M
M
M
M
M
1932
M
M
M
M
M
M
M
M
M
M
M
M
1933
M
M
M
M
M
M
M
M
M
M
M
M
1934
M
M
M
M
M
M
M
M
M
M
M
M
1935
M
M
M
M
M
M
M
M
M
M
M
M
1936
M
M
M
M
M
8.1
M
M
M
M
M
M
1937
M
M
M
M
M
M
M
M
M
M
M
M
1938
M
M
M
M
M
M
M
M
M
M
M
M
1939
M
M
M
M
M
M
M
M
M
M
M
M
1940
M
M
M
M
M
M
M
M
M
M
M
M
1941
M
M
M
M
M
M
M
M
M
M
M
M
1942
M
M
M
M
M
M
M
M
M
M
M
M
1943
M
M
M
M
M
M
M
M
M
M
M
M
1944
M
M
M
M
M
M
M
M
M
M
M
M
1945
M
M
M
M
M
M
M
M
M
M
M
M
1946
M
M
M
M
M
M
M
M
M
M
M
M
1947
M
M
M
M
M
M
M
M
M
M
M
M
1948
9.1
9.6
10.4
9.1
8.1
8.4
8.0
5.7
7.3
6.5
7.8
7.7
1949
8.3
7.9
8.7
9.5
6.9
8.0
7.5
6.5
7.2
6.5
8.2
7.2
1950
8.1
8.4
8.2
10.0
7.6
7.9
8.1
6.6
8.2
8.1
8.5
7.7
1951
9.1
8.5
9.7
9.9
8.4
7.1
6.5
6.5
6.0
7.3
8.2
7.1
1952
8.8
8.4
8.2
8.4
8.1
6.0
6.1
6.3
6.6
6.7
6.1
6.3
1953
8.1
7.7
8.9
8.3
7.0
5.5
6.2
5.2
7.1
5.7
5.1
6.1
1954
6.9
7.9
8.5
7.8
6.9
7.2
7.4
6.5
5.6
7.8
7.3
10.0
1955
9.3
8.9
11.4
7.5
8.9
7.9
6.8
6.8
8.1
8.2
9.0
8.2
1956
9.3
9.0
11.4
10.9
9.3
7.3
7.8
7.1
8.0
9.1
8.5
9.8
1957
9.7
8.7
9.6
9.5
7.7
7.5
7.0
7.0
7.9
8.3
8.5
10.1
1958
8.6
11.7
9.1
10.4
7.5
8.4
7.3
5.8
6.7
7.4
8.4
8.2
1959
9.1
7.8
9.3
8.7
6.0
5.9
5.6
4.9
6.1
7.2
7.7
7.3
1960
8.3
9.0
9.9
10.6
9.6
8.4
8.0
8.1
8.1
7.5
8.5
6.1
1961
6.5
7.6
8.1
8.9
6.0
6.1
5.9
5.1
6.6
6.9
6.1
7.5
1962
8.3
7.8
9.6
8.7
7.0
6.2
5.8
6.5
6.8
5.8
M
M
1963
M
M
M
M
M
M
M
M
M
M
M
M
1964
M
M
M
M
M
M
M
M
M
M
M
M
1965
M
M
M
M
M
M
M
M
M
M
M
M
1966
M
M
M
M
M
M
M
M
M
M
M
M
1967
M
M
M
M
M
M
M
M
M
M
M
M
1968
M
M
M
M
M
M
M
M
M
M
M
M
1969
M
M
M
M
M
M
M
M
M
M
M
M
1970
M
M
M
M
M
M
M
M
M
M
M
M
1971
M
M
M
M
M
M
M
M
M
M
M
M
1972
M
M
M
M
M
M
M
M
M
M
M
M
1973
4.8
6.2
7.0
8.3
7.0
5.8
5.6
5.4
6.3
7.1
8.1
9.4
1974
9.1
9.7
10.4
10.1
8.7
8.4
5.0
4.7
5.4
5.0
6.5
5.8
1975
6.5
6.3
7.9
8.3
4.8
4.9
4.2
3.9
5.5
5.9
6.3
6.7
1976
7.1
7.8
8.1
7.3
7.4
6.2
5.5
6.5
5.6
6.4
6.6
7.8
1977
8.1
8.3
7.8
7.9
5.6
7.5
6.0
5.6
4.8
7.4
6.8
6.7
1978
7.6
6.5
7.8
7.6
6.6
5.8
5.7
4.9
4.7
6.3
5.4
6.4
1979
6.7
6.9
7.3
6.9
5.9
6.1
5.2
4.6
7.0
5.4
5.4
5.9
1980
6.0
5.9
7.6
7.3
6.0
6.6
4.7
5.1
4.7
6.0
6.5
6.2
1981
6.7
7.4
8.4
7.4
6.7
5.6
5.4
5.9
4.2
M
M
M
1982
M
M
M
M
M
M
M
M
M
M
M
M
1983
M
M
M
M
M
M
M
M
M
M
M
M
1984
M
M
M
M
M
M
M
M
M
M
M
M
1985
M
M
M
M
M
M
M
M
M
M
M
M
1986
M
M
M
M
M
M
M
M
M
M
M
M
1987
M
M
M
M
M
M
M
M
M
M
M
M
1988
M
M
M
M
M
M
M
M
M
M
M
M
1989
M
M
M
M
M
M
M
M
M
M
M
M
1990
M
M
M
M
M
M
M
M
M
M
M
M
1991
M
M
M
M
M
M
M
M
M
M
M
M
1992
M
M
M
M
M
M
M
M
M
M
M
M
1993
M
M
M
M
M
M
M
M
M
M
M
M
1994
M
M
M
M
M
M
M
M
M
M
M
M
1995
M
M
M
M
M
M
M
M
M
M
M
M
1996
M
M
M
M
M
M
M
M
M
M
M
M
1997
M
M
M
M
M
M
M
M
M
M
M
M
1998
M
M
M
M
M
M
M
M
M
M
M
M
1999
M
M
M
M
M
M
M
M
M
M
M
M
2000
M
M
M
M
M
M
M
M
M
M
M
M
2001
M
M
M
M
M
M
M
M
M
M
M
M
2002
M
M
M
M
M
M
M
M
M
M
M
M
2003
M
M
M
M
M
M
M
M
M
M
M
M
2004
M
M
M
M
M
M
M
M
M
M
M
M
2005
M
M
M
M
M
M
M
M
M
M
M
M
2006
M
M
M
M
M
M
M
M
M
M
M
M
2007
M
M
M
M
M
M
M
M
M
M
M
M
2008
M
M
M
M
M
M
M
M
M
M
M
M
2009
M
M
M
5.0
4.7
2.9
3.7
2.9
3.8
3.6
4.8
4.5
2010
5.8
5.4
4.9
4.1
4.1
3.7
3.9
3.0
3.8
4.0
5.0
6.4
2011
5.6
6.5
6.5
7.4
5.1
5.2
3.6
3.7
3.5
5.3
4.0
4.1
2012
5.2
4.6
4.3
5.1
3.7
3.7
3.4
2.5
2.9
4.1
4.4
4.8
2013
4.3
5.7
6.4
5.0
4.2
3.7
3.2
2.8
2.8
2.9
4.4
3.8
2014
5.2
4.6
6.3
5.7
4.0
3.2
3.7
3.3
3.8
3.7
4.2
4.1
2015
4.9
5.2
4.9
4.7
3.4
3.5
3.9
2.7
4.3
4.6
3.7
3.3
2016
4.6
6.5
4.7
5.3
4.7
3.9
3.1
2.8
3.2
3.8
3.3
3.6
2017
4.2
5.2
5.6
4.6
4.3
2.9
3.1
3.3
3.9
3.5
2.8
3.8
2018
4.1
4.3
6.1
5.2
3.0
3.4
2.8
2.3
3.4
3.5
4.2
4.2
2019
4.2
4.4
4.2
4.1
3.3
3.7
2.8
2.6
2.5
3.4
3.4
4.3
2020
3.9
4.5
4.1
4.4
3.8
3.6
2.4
2.1
4.3
2.8
2.9
3.1
2021
3.5
4.9
4.0
3.7
3.2
2.4
2.1
1.4
1.4
2.3
2.9
2.3
2022
3.4
3.1
3.9
3.3
3.9
2.9
3.4
2.6
4.5
3.4
4.3
3.0
2023
3.4
4.6
4.8
4.9
5.3
4.0
2.7
3.1
3.0
3.4
3.5
4.0
2024
5.2
5.0
5.2
4.9
3.2
3.0
2.8
3.6
5.0
2.7
3.7
4.2
2025
4.1
4.6
5.7
4.3
4.4
3.5
3.1
M
M
M
M
M
NCEI Climatology
M
M
M
M
M
M
M
M
M
M
M
M
Average Daily High Temperature [F]
Year
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
1930
M
M
M
M
M
85.83
91.97
87.65
85.27
70.58
56.13
46.74
1931
52.29
56.11
55.61
69.20
76.42
90.83
92.23
87.81
88.63
77.90
68.97
58.68
1932
59.48
60.72
59.61
71.37
78.13
86.63
92.61
86.87
80.93
71.06
56.37
52.29
1933
57.23
53.32
62.32
70.40
83.81
90.03
86.45
85.87
86.03
72.23
61.90
57.23
1934
53.65
48.00
58.77
71.00
78.97
88.43
92.52
87.81
85.50
73.10
63.37
50.32
1935
50.26
53.61
68.06
70.70
80.10
88.57
89.68
88.68
82.10
75.26
63.03
44.10
1936
45.84
49.55
64.39
68.13
85.45
89.17
91.26
88.81
84.00
72.81
59.63
51.35
1937
55.65
52.07
61.16
69.10
80.87
89.03
89.10
87.29
79.10
67.29
57.10
50.77
1938
51.06
58.89
67.77
71.03
80.48
85.23
87.23
90.13
82.60
74.87
64.37
51.26
1939
54.58
57.61
65.90
70.87
79.23
90.57
90.06
87.19
86.50
76.94
60.07
54.58
1940
39.55
51.97
58.61
69.57
78.81
87.43
86.42
85.48
81.60
74.06
60.13
55.29
1941
51.35
50.11
55.81
72.63
83.65
85.20
87.03
87.45
85.87
79.03
63.47
55.87
1942
51.00
47.82
61.81
76.43
79.29
87.87
89.84
85.03
81.30
72.29
63.07
50.06
1943
53.84
56.82
58.84
70.57
81.03
91.13
87.26
89.77
79.87
71.29
61.80
52.84
1944
51.61
56.03
60.87
69.37
83.81
90.60
86.68
84.65
82.07
72.48
58.07
47.87
1945
51.03
54.93
70.90
73.53
76.77
88.97
86.52
85.97
83.80
71.81
61.67
45.29
1946
51.26
57.00
68.13
73.87
76.97
86.83
85.84
85.10
79.77
73.16
65.23
58.23
1947
54.45
49.36
53.52
73.67
81.39
85.37
86.52
88.65
83.20
73.23
56.10
53.06
1948
45.39
54.69
65.42
74.67
81.03
89.50
89.68
87.13
79.60
70.48
63.87
54.90
1949
59.74
59.14
64.10
69.13
80.71
86.47
89.10
85.29
78.77
74.19
61.13
52.26
1950
61.32
58.14
59.23
70.67
81.71
87.07
85.68
86.45
79.57
74.58
59.50
47.90
1951
51.74
56.25
61.35
70.57
80.55
86.47
90.55
91.16
82.13
74.94
56.20
53.61
1952
58.10
56.66
61.61
72.43
81.58
92.93
91.29
85.84
80.27
70.29
62.43
52.03
1953
56.39
56.32
63.81
72.20
84.94
88.23
90.00
89.77
80.80
74.94
64.00
51.97
1954
53.90
60.04
61.32
74.93
75.19
89.30
92.68
93.00
89.43
76.77
57.03
50.03
1955
51.29
55.86
64.23
75.20
82.00
82.43
88.90
88.55
82.47
71.84
62.17
49.61
1956
50.55
56.48
63.42
70.30
79.39
87.47
89.45
90.58
80.00
70.00
60.57
63.13
1957
52.00
59.29
59.97
75.27
79.65
86.27
89.97
87.81
80.93
66.29
61.97
55.03
1958
46.77
47.46
55.35
70.03
79.74
86.53
88.10
87.58
81.87
71.23
65.63
51.13
1959
52.10
54.64
60.65
73.37
80.58
86.50
87.23
89.06
80.27
70.55
61.67
53.58
1960
50.84
52.00
50.26
75.20
79.97
85.83
87.71
87.94
80.33
73.35
63.40
49.71
1961
49.90
57.07
65.45
66.37
75.00
83.73
87.97
85.81
84.53
75.03
65.73
52.10
1962
48.94
58.96
58.29
70.23
87.58
84.63
89.52
87.74
79.60
73.05
58.13
49.80
1963
47.65
48.96
66.29
73.80
78.26
82.37
86.32
88.19
79.50
76.16
62.43
44.55
1964
51.06
49.21
62.00
70.50
80.06
86.63
84.94
83.48
81.83
67.58
66.33
53.68
1965
52.84
53.71
56.48
71.83
84.10
80.77
86.77
87.77
80.53
70.61
62.27
56.74
1966
44.16
50.86
61.52
69.43
76.03
84.27
88.58
85.29
79.43
69.87
61.80
51.81
1967
54.61
48.43
67.03
74.43
75.13
80.97
83.52
82.81
75.70
70.19
58.17
54.52
1968
46.26
48.79
65.32
70.70
76.16
83.43
85.65
89.39
80.27
70.61
59.50
47.94
1969
47.74
49.29
57.32
71.57
78.71
85.87
89.48
82.61
76.57
69.16
59.87
49.06
1970
44.32
54.75
60.61
72.30
79.97
84.57
88.48
85.23
83.83
71.94
60.17
54.84
1971
46.87
53.04
56.03
71.60
75.87
85.73
83.94
84.00
80.53
73.10
59.57
58.03
1972
52.94
49.93
60.39
71.30
73.90
81.93
85.77
84.61
83.50
68.71
56.97
54.81
1973
46.50
56.50
63.48
67.40
75.84
83.40
86.35
85.03
84.13
73.23
65.03
50.23
1974
58.10
55.29
67.03
71.33
78.00
81.43
85.23
84.23
76.67
72.00
61.57
50.52
1975
54.48
54.96
57.42
69.90
79.83
84.63
85.65
88.65
78.30
74.13
64.67
53.06
1976
49.26
64.48
66.87
75.50
75.26
82.10
86.84
85.52
79.33
66.77
56.57
50.68
1977
40.68
56.18
67.29
76.73
81.81
88.43
93.06
88.45
83.77
70.74
64.03
54.06
1978
43.42
47.50
62.65
72.71
78.26
89.57
92.10
88.97
83.13
73.74
64.30
55.68
1979
47.04
48.57
66.84
74.13
80.97
83.63
83.65
87.61
75.77
69.48
61.77
53.58
1980
49.58
50.28
56.45
70.60
78.52
82.87
91.87
91.13
82.03
67.26
58.53
54.45
1981
49.32
54.07
61.42
75.80
77.45
89.07
89.16
83.67
84.67
M
M
M
1982
M
M
M
M
M
M
M
M
M
M
M
M
1983
M
M
M
M
M
M
M
M
M
M
M
M
1984
M
M
M
M
M
M
M
M
M
M
M
M
1985
M
M
M
M
M
M
M
M
M
M
M
M
1986
M
M
M
M
M
M
M
M
M
M
M
M
1987
M
M
M
M
M
M
M
M
M
M
M
M
1988
M
M
M
M
M
M
M
M
M
M
M
M
1989
M
M
M
M
M
M
M
M
M
M
M
M
1990
M
M
M
M
M
M
M
M
M
M
M
M
1991
M
M
M
M
M
M
M
M
M
M
M
M
1992
M
M
M
M
M
M
M
M
M
M
M
M
1993
M
M
M
M
M
M
M
M
M
M
M
M
1994
M
M
M
M
M
M
M
M
M
M
M
M
1995
M
M
M
M
M
M
M
M
M
M
M
M
1996
M
M
M
M
M
M
M
M
M
M
M
M
1997
M
M
M
M
M
M
M
M
M
M
M
M
1998
M
M
M
M
M
M
M
M
M
M
M
M
1999
M
M
M
M
M
M
M
M
M
M
M
M
2000
M
M
M
M
M
M
M
M
M
M
M
M
2001
M
M
M
M
M
M
M
M
M
M
M
M
2002
M
M
M
M
M
M
M
M
M
M
M
M
2003
M
M
M
M
M
M
M
M
M
M
M
M
2004
M
M
M
M
M
M
M
M
M
M
M
M
2005
M
M
M
M
M
M
M
M
M
M
M
M
2006
M
M
M
M
M
M
M
M
M
M
M
M
2007
M
M
M
M
M
M
M
M
M
M
M
M
2008
M
M
M
M
M
M
M
M
M
M
M
M
2009
M
M
M
79.67
77.58
86.66
86.46
87.86
80.35
68.06
63.44
48.14
2010
47.62
47.36
61.79
76.58
80.83
90.38
91.81
88.79
85.58
75.08
62.42
44.43
2011
47.10
58.55
62.08
76.58
80.31
89.60
93.14
91.69
81.98
71.48
65.00
59.06
2012
56.45
59.56
74.27
74.96
82.40
86.30
91.75
87.39
82.76
72.59
63.62
59.64
2013
57.03
54.95
66.26
73.76
79.15
86.54
86.87
85.19
82.21
74.39
60.32
57.78
2014
48.49
59.19
65.68
75.08
83.27
89.78
87.57
87.10
81.80
76.07
60.80
57.78
2015
55.46
52.70
70.32
73.82
84.84
90.68
92.04
89.43
81.92
69.34
63.26
62.60
2016
48.95
53.10
68.64
72.14
77.87
88.82
92.85
88.73
87.08
76.30
66.62
53.25
2017
56.58
65.36
64.46
74.48
78.51
83.66
89.31
85.59
81.14
73.23
62.30
52.61
2018
48.26
61.89
59.29
69.50
81.53
87.86
86.70
86.35
85.26
73.34
55.94
51.74
2019
51.28
58.74
60.80
73.40
83.50
84.38
89.31
87.57
88.88
74.91
57.98
55.86
2020
53.54
55.96
65.85
71.24
75.08
84.44
91.40
87.22
78.14
73.05
65.96
52.90
2021
50.99
52.89
64.92
72.14
77.75
84.80
87.45
88.26
81.68
73.57
60.50
61.50
2022
49.71
58.10
66.66
71.96
81.12
88.46
89.60
86.78
79.88
69.68
62.48
49.71
2023
56.33
62.79
65.15
71.00
75.14
81.68
89.14
87.34
81.98
74.04
62.84
56.68
2024
51.28
59.99
66.08
73.58
79.90
87.20
89.83
86.87
79.53
73.63
64.76
54.12
2025
48.03
58.94
68.23
74.72
76.59
87.50
85.40
M
M
M
M
M
NCEI Climatology
54.10
58.62
66.00
74.79
81.00
86.99
90.10
88.31
83.40
74.40
63.81
55.80
Average Daily Low Temperature [F]
Year
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
1930
M
M
M
M
M
64.33
70.03
65.03
66.30
49.10
40.53
30.26
1931
33.68
35.00
37.10
48.37
56.39
66.07
71.06
67.26
66.03
51.84
47.10
41.65
1932
42.77
42.31
38.55
49.47
57.77
67.10
71.42
69.03
63.43
51.65
39.17
37.55
1933
40.87
35.29
41.00
48.40
62.45
67.67
68.65
69.13
67.37
52.45
41.33
40.87
1934
36.23
29.04
37.26
49.93
58.55
68.30
71.65
70.32
65.37
51.84
43.07
33.71
1935
34.68
34.36
46.48
51.00
58.94
66.80
70.77
69.48
63.30
50.81
45.63
28.65
1936
29.23
32.34
44.32
47.63
60.32
66.43
70.97
69.10
65.60
55.19
40.43
38.00
1937
43.77
35.21
39.74
48.63
58.74
68.87
69.06
69.94
61.30
49.16
38.37
34.06
1938
34.58
40.18
47.13
50.03
60.39
65.50
69.58
70.52
63.60
50.94
43.50
34.81
1939
35.42
39.75
44.19
49.30
58.55
70.47
69.94
68.39
64.83
53.90
40.07
35.55
1940
23.45
34.24
38.71
47.40
55.90
66.93
69.06
69.32
60.97
51.65
41.73
38.61
1941
33.94
30.25
36.06
53.03
60.06
67.73
70.68
70.48
65.27
58.58
41.40
38.29
1942
33.35
32.21
42.45
51.90
60.35
69.40
71.26
68.52
63.70
53.61
43.63
33.48
1943
36.00
35.93
40.00
49.37
61.55
70.87
69.74
70.06
60.17
50.06
38.80
35.52
1944
35.39
40.00
40.68
49.00
61.19
68.53
67.84
67.65
64.73
52.00
41.63
30.84
1945
34.19
38.21
51.16
53.53
56.52
66.93
70.45
68.35
67.17
50.16
42.93
31.03
1946
35.84
36.50
49.45
52.07
58.68
66.67
69.42
67.39
62.67
52.23
47.33
37.52
1947
38.87
27.46
34.65
53.20
59.32
66.23
66.52
70.35
65.13
57.39
41.47
35.13
1948
27.87
36.21
44.84
54.10
59.16
66.23
69.84
66.90
61.17
47.45
45.43
37.84
1949
42.68
41.25
41.16
47.93
58.81
67.80
71.77
67.90
59.90
57.10
37.53
35.81
1950
43.48
38.00
36.90
46.10
60.58
66.87
67.16
66.61
61.07
54.81
34.67
30.19
1951
32.06
33.86
42.61
49.07
56.23
66.27
68.77
69.23
62.97
53.48
35.47
35.58
1952
38.87
36.10
40.06
49.47
59.32
70.23
69.39
67.19
60.80
45.68
40.13
33.61
1953
36.42
36.96
42.87
48.30
63.00
66.63
68.97
66.45
59.93
51.03
39.77
35.06
1954
33.61
36.79
40.61
53.50
54.03
66.00
70.45
70.10
64.33
51.29
38.47
31.67
1955
33.39
34.82
41.94
53.90
61.06
61.57
70.52
70.61
64.60
49.68
38.57
30.84
1956
30.90
38.79
39.90
47.30
60.10
65.63
69.19
68.87
60.10
54.90
39.00
42.32
1957
35.35
41.32
40.81
52.77
60.23
67.47
68.39
66.23
64.10
47.90
43.17
34.23
1958
27.58
25.61
37.97
49.60
59.00
65.57
69.26
68.39
59.90
48.39
44.57
30.58
1959
30.16
37.14
37.90
50.13
60.58
64.57
68.58
68.42
62.80
54.74
39.20
34.42
1960
34.45
32.41
29.65
50.40
54.77
64.40
68.74
69.06
63.73
53.13
40.13
27.32
1961
27.90
36.18
43.52
44.03
54.58
62.47
66.45
66.71
63.60
47.55
45.80
33.74
1962
31.87
36.32
39.16
46.27
62.65
65.63
68.68
67.13
60.37
52.64
41.67
32.33
1963
30.48
28.93
45.16
53.83
59.39
66.87
67.84
68.13
60.73
53.00
43.27
27.90
1964
32.90
31.72
40.74
51.40
60.52
68.77
69.26
68.35
62.70
48.03
45.97
39.35
1965
33.77
35.36
39.00
53.37
64.16
65.53
70.06
69.39
65.07
50.06
44.10
35.42
1966
30.16
36.14
40.81
49.43
59.23
64.53
69.45
68.58
62.53
50.35
42.47
35.35
1967
35.32
34.04
45.00
54.23
56.48
64.17
67.42
66.77
57.67
49.71
38.83
38.68
1968
30.00
29.48
42.13
51.73
56.68
65.73
68.81
68.71
60.90
52.32
41.40
30.81
1969
32.06
33.64
36.94
51.87
58.48
67.77
71.23
66.84
62.13
53.03
39.83
33.32
1970
27.10
32.64
40.52
52.57
59.10
65.60
69.45
68.48
65.33
55.03
40.63
37.29
1971
33.13
32.75
37.52
48.50
55.45
66.93
68.23
68.29
65.10
58.68
41.20
44.39
1972
37.61
32.90
41.90
48.97
57.42
62.17
67.68
68.00
63.50
50.45
42.03
40.77
1973
35.40
34.60
47.13
49.07
56.00
67.17
69.71
68.42
65.70
53.32
44.31
34.97
1974
45.16
35.32
45.81
50.77
59.19
62.80
68.16
68.19
60.70
47.77
40.70
35.71
1975
37.13
38.68
39.65
49.87
62.40
67.00
69.39
69.94
63.80
54.87
44.87
34.90
1976
31.06
41.03
48.10
50.43
57.00
65.43
69.19
67.42
61.70
48.71
36.83
33.10
1977
25.42
34.18
48.97
55.43
62.52
67.77
72.26
71.16
67.23
52.26
49.73
37.74
1978
29.16
30.61
41.97
50.81
57.61
66.10
68.42
68.23
64.77
50.16
47.97
35.87
1979
30.82
32.21
45.81
53.53
60.94
63.30
64.90
65.03
60.87
47.52
43.50
36.03
1980
36.48
30.90
39.48
49.27
56.32
62.27
67.48
66.71
62.76
47.94
39.77
34.19
1981
29.00
35.00
39.16
52.83
53.97
66.80
67.81
65.00
65.17
M
M
M
1982
M
M
M
M
M
M
M
M
M
M
M
M
1983
M
M
M
M
M
M
M
M
M
M
M
M
1984
M
M
M
M
M
M
M
M
M
M
M
M
1985
M
M
M
M
M
M
M
M
M
M
M
M
1986
M
M
M
M
M
M
M
M
M
M
M
M
1987
M
M
M
M
M
M
M
M
M
M
M
M
1988
M
M
M
M
M
M
M
M
M
M
M
M
1989
M
M
M
M
M
M
M
M
M
M
M
M
1990
M
M
M
M
M
M
M
M
M
M
M
M
1991
M
M
M
M
M
M
M
M
M
M
M
M
1992
M
M
M
M
M
M
M
M
M
M
M
M
1993
M
M
M
M
M
M
M
M
M
M
M
M
1994
M
M
M
M
M
M
M
M
M
M
M
M
1995
M
M
M
M
M
M
M
M
M
M
M
M
1996
M
M
M
M
M
M
M
M
M
M
M
M
1997
M
M
M
M
M
M
M
M
M
M
M
M
1998
M
M
M
M
M
M
M
M
M
M
M
M
1999
M
M
M
M
M
M
M
M
M
M
M
M
2000
M
M
M
M
M
M
M
M
M
M
M
M
2001
M
M
M
M
M
M
M
M
M
M
M
M
2002
M
M
M
M
M
M
M
M
M
M
M
M
2003
M
M
M
M
M
M
M
M
M
M
M
M
2004
M
M
M
M
M
M
M
M
M
M
M
M
2005
M
M
M
M
M
M
M
M
M
M
M
M
2006
M
M
M
M
M
M
M
M
M
M
M
M
2007
M
M
M
M
M
M
M
M
M
M
M
M
2008
M
M
M
M
M
M
M
M
M
M
M
M
2009
M
M
M
50.49
59.17
66.50
66.84
67.88
62.66
49.65
42.98
31.88
2010
27.94
30.46
39.20
48.98
61.15
69.38
70.44
71.14
62.72
49.07
39.92
27.53
2011
28.92
36.76
42.22
50.36
57.08
66.86
71.60
70.03
62.84
48.03
42.02
39.84
2012
36.18
37.65
51.34
51.14
62.31
64.82
71.54
69.39
62.78
51.68
39.26
42.22
2013
39.20
35.60
38.56
51.32
57.32
69.26
71.19
69.28
63.76
51.22
39.38
35.54
2014
27.76
37.08
38.91
51.08
59.75
68.84
69.34
68.58
65.36
47.97
37.64
39.20
2015
32.81
30.97
44.95
55.22
61.96
69.74
71.14
69.92
64.34
48.90
44.54
45.53
2016
30.55
35.10
45.70
49.34
57.20
66.86
70.50
70.96
64.76
51.80
41.48
35.72
2017
38.21
40.36
41.29
53.18
57.03
65.00
68.87
68.35
61.28
51.68
40.40
35.37
2018
27.18
43.83
39.08
45.08
62.02
67.28
69.16
68.52
69.18
55.40
38.84
37.23
2019
34.38
39.65
40.36
50.90
61.96
66.02
69.45
68.12
66.20
55.57
38.48
36.59
2020
36.94
37.90
48.43
47.18
53.77
65.00
70.38
69.22
61.40
53.14
44.48
32.46
2021
34.21
34.25
44.02
47.06
55.92
65.66
68.64
68.87
61.40
54.18
36.14
41.75
2022
31.71
36.37
43.79
46.82
59.93
66.20
70.67
68.72
59.50
46.98
43.46
34.32
2023
38.56
42.16
42.97
48.38
56.27
61.52
69.10
68.52
62.06
49.88
40.04
35.31
2024
31.59
37.34
43.50
50.24
60.10
66.62
70.50
67.36
63.87
47.45
45.80
34.15
2025
27.99
37.21
41.99
53.30
57.78
66.98
71.00
M
M
M
M
M
NCEI Climatology
31.49
33.89
39.80
47.30
56.01
64.60
68.61
67.80
61.61
49.01
38.39
33.60
Average Daily Temperature (high+low)/2 [F]
Year
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
1930
M
M
M
M
M
75.08
81.00
76.34
75.78
59.84
48.33
38.50
1931
42.98
45.55
46.35
58.78
66.40
78.45
81.65
77.53
77.33
64.87
58.03
50.16
1932
51.13
51.52
49.08
60.42
67.95
76.87
82.02
77.95
72.18
61.35
47.77
44.92
1933
49.05
44.30
51.66
59.40
73.13
78.85
77.55
77.50
76.70
62.34
51.62
49.05
1934
44.94
38.52
48.02
60.47
68.76
78.37
82.08
79.06
75.43
62.47
53.22
42.02
1935
42.47
43.98
57.27
60.85
69.52
77.68
80.23
79.08
72.70
63.03
54.33
36.37
1936
37.53
40.95
54.35
57.88
72.89
77.80
81.11
78.95
74.80
64.00
50.03
44.68
1937
49.71
43.64
50.45
58.87
69.81
78.95
79.08
78.61
70.20
58.23
47.73
42.42
1938
42.82
49.54
57.45
60.53
70.44
75.37
78.40
80.32
73.10
62.90
53.93
43.03
1939
45.00
48.68
55.05
60.08
68.89
80.52
80.00
77.79
75.67
65.42
50.07
45.06
1940
31.50
43.10
48.66
58.48
67.35
77.18
77.74
77.40
71.28
62.85
50.93
46.95
1941
42.65
40.18
45.94
62.83
71.85
76.47
78.85
78.97
75.57
68.81
52.43
47.08
1942
42.18
40.02
52.13
64.17
69.82
78.63
80.55
76.77
72.50
62.95
53.35
41.77
1943
44.92
46.38
49.42
59.97
71.29
81.00
78.50
79.92
70.02
60.68
50.30
44.18
1944
43.50
48.02
50.77
59.18
72.50
79.57
77.26
76.15
73.40
62.24
49.85
39.35
1945
42.61
46.57
61.03
63.53
66.65
77.95
78.48
77.16
75.48
60.98
52.30
38.16
1946
43.55
46.75
58.79
62.97
67.82
76.75
77.63
76.24
71.22
62.69
56.28
47.87
1947
46.66
38.41
44.08
63.43
70.35
75.80
76.52
79.50
74.17
65.31
48.78
44.10
1948
36.63
45.45
55.13
64.38
70.10
77.87
79.76
77.02
70.38
58.97
54.65
46.37
1949
51.21
50.20
52.63
58.53
69.76
77.13
80.44
76.60
69.33
65.65
49.33
44.03
1950
52.40
48.07
48.06
58.38
71.15
76.97
76.42
76.53
70.32
64.69
47.08
39.05
1951
41.90
45.05
51.98
59.82
68.39
76.37
79.66
80.19
72.55
64.21
45.83
44.60
1952
48.48
46.38
50.84
60.95
70.45
81.58
80.34
76.52
70.53
57.98
51.28
42.82
1953
46.40
46.64
53.34
60.25
73.97
77.43
79.48
78.11
70.37
62.98
51.88
43.52
1954
43.76
48.41
50.97
64.22
64.61
77.65
81.56
81.55
76.88
64.03
47.75
40.57
1955
42.34
45.34
53.08
64.55
71.53
72.00
79.71
79.58
73.53
60.76
50.37
40.23
1956
40.73
47.64
51.66
58.80
69.74
76.55
79.32
79.73
70.05
62.45
49.78
52.73
1957
43.68
50.30
50.39
64.02
69.94
76.87
79.18
77.02
72.52
57.10
52.57
44.63
1958
37.18
36.54
46.66
59.82
69.37
76.05
78.68
77.98
70.88
59.81
55.10
40.85
1959
41.13
45.89
49.27
61.75
70.58
75.53
77.90
78.74
71.53
62.65
50.43
44.00
1960
42.65
42.21
39.95
62.80
67.37
75.12
78.23
78.50
72.03
63.24
51.77
38.52
1961
38.90
46.62
54.48
55.20
64.79
73.10
77.21
76.26
74.07
61.29
55.77
42.92
1962
40.40
47.64
48.73
58.25
75.11
75.13
79.10
77.44
69.98
62.84
49.90
41.07
1963
39.06
38.95
55.73
63.82
68.82
74.62
77.08
78.16
70.12
64.58
52.85
36.23
1964
41.98
40.47
51.37
60.95
70.29
77.70
77.10
75.92
72.27
57.81
56.15
46.52
1965
43.31
44.54
47.74
62.60
74.13
73.15
78.42
78.58
72.80
60.34
53.18
46.08
1966
37.16
43.50
51.16
59.43
67.63
74.40
79.02
76.94
70.98
60.11
52.13
43.58
1967
44.97
41.23
56.02
64.33
65.81
72.57
75.47
74.79
66.68
59.95
48.50
46.60
1968
38.13
39.14
53.73
61.22
66.42
74.58
77.23
79.05
70.58
61.47
50.45
39.37
1969
39.90
41.46
47.13
61.72
68.60
76.82
80.35
74.73
69.35
61.10
49.85
41.19
1970
35.71
43.70
50.56
62.43
69.53
75.08
78.97
76.85
74.58
63.48
50.40
46.06
1971
40.00
42.89
46.77
60.05
65.66
76.33
76.08
76.15
72.82
65.89
50.38
51.21
1972
45.27
41.41
51.15
60.13
65.66
72.05
76.73
76.31
73.50
59.58
49.50
47.79
1973
40.95
45.55
55.31
58.23
65.92
75.28
78.03
76.73
74.92
63.27
54.67
42.60
1974
51.63
45.30
56.42
61.05
68.60
72.12
76.69
76.21
68.68
59.89
51.13
43.11
1975
45.81
46.82
48.53
59.88
71.12
75.82
77.52
79.29
71.05
64.50
54.77
43.98
1976
40.16
52.76
57.48
62.97
66.13
73.77
78.02
76.47
70.52
57.74
46.70
41.89
1977
33.05
45.18
58.13
66.08
72.16
78.10
82.66
79.81
75.50
61.50
56.88
45.90
1978
36.29
39.05
52.31
61.76
67.94
77.83
80.26
78.60
73.95
61.95
56.13
45.77
1979
38.93
40.39
56.32
63.83
70.95
73.47
74.27
76.32
68.32
58.50
52.63
44.81
1980
43.03
40.59
47.97
59.93
67.42
72.57
79.68
78.92
72.40
57.60
49.15
44.32
1981
39.16
44.54
50.29
64.32
65.71
77.93
78.48
74.33
74.92
M
M
M
1982
M
M
M
M
M
M
M
M
M
M
M
M
1983
M
M
M
M
M
M
M
M
M
M
M
M
1984
M
M
M
M
M
M
M
M
M
M
M
M
1985
M
M
M
M
M
M
M
M
M
M
M
M
1986
M
M
M
M
M
M
M
M
M
M
M
M
1987
M
M
M
M
M
M
M
M
M
M
M
M
1988
M
M
M
M
M
M
M
M
M
M
M
M
1989
M
M
M
M
M
M
M
M
M
M
M
M
1990
M
M
M
M
M
M
M
M
M
M
M
M
1991
M
M
M
M
M
M
M
M
M
M
M
M
1992
M
M
M
M
M
M
M
M
M
M
M
M
1993
M
M
M
M
M
M
M
M
M
M
M
M
1994
M
M
M
M
M
M
M
M
M
M
M
M
1995
M
M
M
M
M
M
M
M
M
M
M
M
1996
M
M
M
M
M
M
M
M
M
M
M
M
1997
M
M
M
M
M
M
M
M
M
M
M
M
1998
M
M
M
M
M
M
M
M
M
M
M
M
1999
M
M
M
M
M
M
M
M
M
M
M
M
2000
M
M
M
M
M
M
M
M
M
M
M
M
2001
M
M
M
M
M
M
M
M
M
M
M
M
2002
M
M
M
M
M
M
M
M
M
M
M
M
2003
M
M
M
M
M
M
M
M
M
M
M
M
2004
M
M
M
M
M
M
M
M
M
M
M
M
2005
M
M
M
M
M
M
M
M
M
M
M
M
2006
M
M
M
M
M
M
M
M
M
M
M
M
2007
M
M
M
M
M
M
M
M
M
M
M
M
2008
M
M
M
M
M
M
M
M
M
M
M
M
2009
M
M
M
65.08
68.38
76.58
76.65
77.87
71.51
58.85
53.21
40.01
2010
37.78
38.91
50.49
62.78
70.99
79.88
81.12
79.96
74.15
62.08
51.17
35.98
2011
38.01
47.65
52.15
63.47
68.70
78.23
82.37
80.86
72.41
59.75
53.51
49.45
2012
46.31
48.60
62.80
63.05
72.35
75.56
81.65
78.39
72.77
62.14
51.44
50.93
2013
48.11
45.27
52.41
62.54
68.23
77.90
79.03
77.23
72.98
62.80
49.85
46.66
2014
38.13
48.14
52.29
63.08
71.51
79.31
78.45
77.84
73.58
62.02
49.22
48.49
2015
44.14
41.84
57.64
64.52
73.40
80.21
81.59
79.67
73.13
59.12
53.90
54.06
2016
39.75
44.10
57.17
60.74
67.54
77.84
81.67
79.85
75.92
64.05
54.05
44.48
2017
47.39
52.86
52.87
63.83
67.77
74.33
79.09
76.97
71.21
62.45
51.35
43.99
2018
37.72
52.86
49.19
57.29
71.77
77.57
77.93
77.44
77.22
64.37
47.39
44.48
2019
42.83
49.20
50.58
62.15
72.73
75.20
79.38
77.84
77.54
65.24
48.23
46.23
2020
45.24
46.93
57.14
59.21
64.43
74.72
80.89
78.22
69.77
63.09
55.22
42.68
2021
42.60
43.57
54.47
59.60
66.84
75.23
78.05
78.57
71.54
63.88
48.32
51.63
2022
40.71
47.24
55.23
59.39
70.53
77.33
80.14
77.75
69.69
58.33
52.97
42.02
2023
47.45
52.48
54.06
59.69
65.71
71.60
79.12
77.93
72.02
61.96
51.44
45.99
2024
41.44
48.67
54.79
61.91
70.00
76.91
80.16
77.12
71.70
60.54
55.28
44.14
2025
38.01
48.07
55.11
64.01
67.19
77.24
78.20
M
M
M
M
M
NCEI Climatology
42.80
46.26
52.90
61.05
68.50
75.80
79.35
78.05
72.51
61.70
51.10
44.70
Average Relative Humidity [%]
This value is computed via a simple average of available observations weighted
by the duration between observations.
