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.

  1. 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.
  2. There is a station monitor app that allows you to see current summarized statistics for a station collection of your choice.
  3. The Automated Data Plotting application on this website contains charts and downloadable datasets that may interest you.

Data is available from the following states:

Select Climate Station:Select Report:

or Select from map

Download This Report Download This Report as Excel View This Report in Autoplot App 

# IEM Climodat https://mesonet.agron.iastate.edu/climodat/
# Report Generated: 30 Sep 2023
# Climate Record: 1893-01-01 -> 2023-09-30
# Site Information: [IA0200] AMES-8-WSW
# Contact: Daryl Herzmann akrherz@iastate.edu 515.294.5978
# Low Temperature exceedence probabilities
# On a certain date, what is the observed frequency that a given
temperature threshold has been first observed by the given date.
 DOY Date    <=32  <=28  <=26  <=22
 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   59   19   10    3
 282 Oct 08   63   26   16    4
 284 Oct 10   70   33   22    6
 286 Oct 12   74   41   27   10
 288 Oct 14   76   43   30   10
 290 Oct 16   81   48   35   13
 292 Oct 18   84   53   40   17
 294 Oct 20   86   59   45   20
 296 Oct 22   90   70   51   23
 298 Oct 24   92   74   57   24
 300 Oct 26   93   80   62   35
 302 Oct 28   96   83   69   39
 304 Oct 30   96   89   72   45
 306 Nov 01   98   89   77   55
 308 Nov 03   98   93   84   61
 310 Nov 05  100   94   90   66
 312 Nov 07  100   96   92   70
 314 Nov 09  100   97   94   76
 316 Nov 11  100   98   95   82
 318 Nov 13  100   99   96   86
 320 Nov 15  100   99   98   90
 322 Nov 17  100   99   98   92
 324 Nov 19  100  100  100   95
 326 Nov 21  100  100  100   96
 328 Nov 23  100  100  100   97
 330 Nov 25  100  100  100   99
 332 Nov 27  100  100  100   99
 334 Nov 29  100  100  100   99