If you are looking for actual NWS COOP observations with no estimating and very little quality control done, check out this page.

This page allows you to download observed, sometimes quality controlled, and sometimes estimated once daily reports from various NWS networks including COOP. More detailed documentation exists here and should be consulted before using the data. Backend documentation exists for those wishing to script against the backend service.

Data is also available from the following states:

The purpose is to provide a dataset that does not have holes in it for temperature and precipitation and is updated up until yesterday for most sites. Unfortunately, these values are not on a local calendar day, so please be very careful before use. Unfortunately, long term observations that are on local calendar days does not exist for many locations!

1. Select station(s):

2. Select Start/End Time:

Please note the start year in the station selector. If you only want data for one day, set the start and end times to the same value.
YearMonthDay
Start:
End:

3. Select Variables:

If you select a model format in option 4 below, this selection is ignored.

4. Specialized Data/Model Formats

When you select a given data format, it will override any selected variables above and formats below. These are specialized formats typically used for modelling and their choice dictates the variables to be included. Please contact us to have your format added to the list! The bundled solar radiation with these model files is first prioritized by availability (ie HRRR for past week) and then proceeds from ERA5-Land to NARR to MERRAv2.

5. How to view?

Note that the Excel format is limited to 1,048,576 rows of data, so selecting it will limit the returned data.

6. Data Delimitation:

This option is only relevant if you did not select "Excel File" from #5 above.

7. Include Latitude and Longitude in output?

8. Fill out last year with scenario

Optional! This is a bit tricky to explain. The common usage case is to fill out the current calendar's year worth of data with some data from the past. For example, if today is 16 August 2024 and you select 2023 as the scenario year, the data for 16 August 2024 would instead be a copy of what was observed on 16 August 2023. If you select a date period that was in the past and not ending on 31 December, you could still use this feature to fill out the year with the scenario year. The scenario year could be from the future! For example, what if 2020 ended like what was observed in 2023.

9. Submit Form:

Please be patient and only submit this form once. It may take 10-20 seconds to get a response.

Publications Citing IEM Data (View All)

These are the most recent 10 publications that have cited the usage of data from this page. This list is not exhaustive, so please let us know if you have a publication that should be added.