Grinnell Rgnl climate by month
Averages and records for each calendar month at Grinnell Rgnl, United States, from 1893 to 2026. The warmest month is July, averaging 29.5°C; the coolest is January at −1.8°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | −1.8°C | −12.3°C | 17.8°C9 January 2003 | −36.7°C13 January 1974 | 114 / 115 |
| February | 0.7°C | −10.3°C | 25.0°C27 February 2024 | −37.2°C3 February 1996 | 114 / 115 |
| March | 7.6°C | −4.0°C | 32.2°C23 March 1910 | −27.2°C1 March 1962 | 113 / 114 |
| April | 15.8°C | 2.7°C | 33.3°C29 April 1910 | −17.2°C6 April 1982 | 115 / 116 |
| May | 21.9°C | 8.9°C | 36.7°C22 May 1925 | −7.2°C3 May 2005 | 116 / 116 |
| June | 27.1°C | 14.3°C | 38.9°C5 June 1911 | 1.7°C6 June 1983 | 103 / 106 |
| July | 29.5°C | 16.7°C | 41.1°C3 July 1911 | 4.4°C31 July 1971 | 105 / 105 |
| August | 28.4°C | 15.3°C | 41.7°C5 August 1918 | 2.2°C20 August 1950 | 104 / 104 |
| September | 24.4°C | 10.8°C | 38.3°C4 September 1925 | −6.1°C29 September 1984 | 108 / 113 |
| October | 17.7°C | 4.3°C | 35.0°C6 October 1963 | −16.7°C28 October 1925 | 115 / 115 |
| November | 8.7°C | −2.7°C | 27.8°C1 November 1968 | −26.1°C30 November 1976 | 115 / 116 |
| December | 0.8°C | −9.2°C | 20.6°C5 December 1998 | −35.6°C19 December 1985 | 113 / 114 |
Years shows the number behind the average high, then the number holding a record for that month. They differ because a year contributes an average only when the month has at least 25 days of readings, while a single reading is enough to set a record. The average low is withheld on the same 25-day rule and is counted separately again; it is shown as a dash where the archive cannot support it. Across the twelve months here the averages rest on 103 to 116 years each.
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Every figure on this page is computed from NOAA GHCN-Daily observations stored per station, per year, per month. Nothing is modelled, interpolated or estimated, and a month the archive never covered is left out rather than filled in. A station appears here only once all twelve months carry an average from at least 10 years. See how this is built.