IEM "Climodat" Reports
These "Climodat" reports provide some answers to the most common climatological questions we get routinely asked. Here are some important notes about the products presented on this page.
- These reports are based on the daily climate observations from the NWS COOP network. Some quality control is done and estimating is done to create a complete time series without missing data. You can download the daily data.
- We also provide "kitchen sink" data files which contain the much of the raw information used to generate the reports.
- There is a station monitor app that allows you to see current summarized statistics for a station collection of your choice.
- For the Iowa data, the Iowa State Climatologist provides the IEM with a monthly update of quality controlled observational data. This procedure takes a good deal of time on his behalf. Quality controlled information exists from 1 Jan 1951 till 01 Jan 2018. Any months of data afterwards are based on preliminary data from NCDC and other sources.
- Some sites have data back to 1893, so their reports contain data dating back to then.
- This Automated Data Plotting application on this website contains charts and downloadable datasets that may interest you.
- Update 27 Oct 2015: The plain text reports are dynamically generated on this page and no longer directly available for bulk download. The format of the generated Excel files is somewhat different now as well. If this causes you heartburn, please do let us know!
Data is available from the following states:
Download This Report Download This Report as Excel View This Report in Autoplot App
# IEM Climodat https://mesonet.agron.iastate.edu/climodat/ # Report Generated: 15 Oct 2021 # Climate Record: 1893-01-01 -> 2021-10-15 # Site Information: [IA0200] AMES-8-WSW # Contact Information: Daryl Herzmann akrherz@iastate.edu 515.294.5978 # Low Temperature exceedence probabilities # (On a certain date, what is the chance a temperature below a certain # threshold would have been observed once already during the fall of that year) DOY Date <33 <29 <27 <23 214 Aug 01 0 0 0 0 216 Aug 03 0 0 0 0 218 Aug 05 0 0 0 0 220 Aug 07 0 0 0 0 222 Aug 09 0 0 0 0 224 Aug 11 0 0 0 0 226 Aug 13 0 0 0 0 228 Aug 15 0 0 0 0 230 Aug 17 0 0 0 0 232 Aug 19 0 0 0 0 234 Aug 21 0 0 0 0 236 Aug 23 0 0 0 0 238 Aug 25 0 0 0 0 240 Aug 27 0 0 0 0 242 Aug 29 0 0 0 0 244 Aug 31 0 0 0 0 246 Sep 02 0 0 0 0 248 Sep 04 0 0 0 0 250 Sep 06 0 0 0 0 252 Sep 08 0 0 0 0 254 Sep 10 0 0 0 0 256 Sep 12 0 0 0 0 258 Sep 14 1 0 0 0 260 Sep 16 3 0 0 0 262 Sep 18 6 0 0 0 264 Sep 20 9 1 1 0 266 Sep 22 12 1 1 0 268 Sep 24 14 3 1 0 270 Sep 26 20 3 3 0 272 Sep 28 27 7 3 1 274 Sep 30 36 10 4 1 276 Oct 02 42 13 5 1 278 Oct 04 49 14 6 2 280 Oct 06 58 19 10 3 282 Oct 08 63 27 16 4 284 Oct 10 69 33 22 6 286 Oct 12 74 41 27 10 288 Oct 14 76 43 29 10 290 Oct 16 81 48 34 12 292 Oct 18 84 52 39 17 294 Oct 20 86 58 44 20 296 Oct 22 89 69 51 23 298 Oct 24 91 74 57 24 300 Oct 26 93 79 62 34 302 Oct 28 95 83 68 38 304 Oct 30 96 88 72 44 306 Nov 01 97 88 76 55 308 Nov 03 97 93 83 61 310 Nov 05 99 93 89 65 312 Nov 07 99 96 91 70 314 Nov 09 99 96 93 76 316 Nov 11 99 97 94 82 318 Nov 13 99 98 95 86 320 Nov 15 99 98 97 89 322 Nov 17 99 98 97 91 324 Nov 19 99 99 99 94 326 Nov 21 99 99 99 96 328 Nov 23 99 99 99 96 330 Nov 25 99 99 99 98 332 Nov 27 99 99 99 98 334 Nov 29 99 99 99 98 336 Dec 01 99 99 99 99 338 Dec 03 99 99 99 99 340 Dec 05 99 99 99 99 342 Dec 07 99 99 99 99 344 Dec 09 99 99 99 99 346 Dec 11 99 99 99 99 348 Dec 13 99 99 99 99 350 Dec 15 99 99 99 99 352 Dec 17 99 99 99 99 354 Dec 19 99 99 99 99 356 Dec 21 99 99 99 99 358 Dec 23 99 99 99 99 360 Dec 25 99 99 99 99 362 Dec 27 99 99 99 99 364 Dec 29 99 99 99 99