September
September · June · August
United States · 1991–2020
September leads for comfortable weather in Ainsworth: typically 25.3°C by day, 11.3°C at night, with 65 mm of rain. Based on measured 1991–2020 NOAA station history.
September · June · August
August · July · June
October · May · September
The weakest month is January, scoring 5 against September’s 83 — days reach only 2.2°C, 22° below the 24°C the score treats as ideal, and nights drop to -9.3°C.
Month by month
The bars show the comfort score. Day and night temperatures come from daily observed highs and lows; rain is the historical monthly estimate.
| Month | Day | Night | Rain | Wet days | Daylight | Comfort | Coverage |
|---|---|---|---|---|---|---|---|
| January | 2.2°C | -9.3°C | 10 mm | 2.5 | 9 h 23 | 5 | Strong coverage |
| February | 4°C | -7.9°C | 16 mm | 3.8 | 10 h 29 | 5 | Strong coverage |
| March | 10.3°C | -3°C | 30 mm | 4.5 | 11 h 48 | 21 | Strong coverage |
| April | 15.8°C | 2.1°C | 67 mm | 6.8 | 13 h 19 | 42 | Strong coverage |
| May | 21.4°C | 8.3°C | 96 mm | 9.3 | 14 h 35 | 65 | Strong coverage |
| June | 27°C | 14.1°C | 96 mm | 8.7 | 15 h 17 | 75 | Strong coverage |
| July | 30.6°C | 17.3°C | 78 mm | 7.1 | 15 h 01 | 65 | Strong coverage |
| August | 29.3°C | 16.2°C | 71 mm | 6.3 | 13 h 54 | 72 | Strong coverage |
| September | 25.3°C | 11.3°C | 65 mm | 5.3 | 12 h 26 | 83 | Strong coverage |
| October | 17.5°C | 4°C | 44 mm | 5.1 | 10 h 59 | 56 | Strong coverage |
| November | 9.3°C | -2.7°C | 16 mm | 2.9 | 9 h 42 | 20 | Strong coverage |
| December | 2.9°C | -7.8°C | 14 mm | 3.1 | 9 h 04 | 5 | Strong coverage |
What has changed
Each bar compares the 2011–2025 daytime average for that month against the same month in 1961–1990, measured at the same station. Months where the older record is too thin to compare are left blank.
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 22.2°C27 Jan 2015 | -35.0°C5 Jan 1924 | 36 mm27 Jan 1944 | 70 mm1910 · driest 0 mm in 1928 | 115 |
| February | 25.0°C3 Feb 1962 | -36.1°C2 Feb 1917 | 38 mm23 Feb 1977 | 82 mm1915 · driest 0 mm in 1910 | 117 |
| March | 32.8°C30 Mar 1943 | -28.9°C16 Mar 1906 | 52 mm11 Mar 1977 | 125 mm1977 · driest 1 mm in 2015 | 118 |
| April | 37.2°C28 Apr 1910 | -21.7°C3 Apr 1936 | 66 mm20 Apr 1920 | 170 mm2001 · driest 0 mm in 1926 | 120 |
| May | 40.6°C29 May 1934 | -10.0°C2 May 1911 | 96 mm5 May 2007 | 235 mm1920 · driest 3 mm in 2006 | 119 |
| June | 42.8°C23 Jun 1937 | 0.0°C3 Jun 1929 | 94 mm20 Jun 2024 | 219 mm1944 · driest 14 mm in 2017 | 120 |
| July | 45.0°C19 Jul 1934 | 1.1°C5 Jul 1915 | 126 mm1 Jul 1962 | 269 mm1962 · driest 6 mm in 1940 | 119 |
| August | 43.9°C4 Aug 1934 | 1.7°C22 Aug 1923 | 86 mm4 Aug 1981 | 229 mm1981 · driest 1 mm in 2000 | 119 |
| September | 41.7°C9 Sep 1931 | -6.1°C29 Sep 1945 | 111 mm11 Sep 2019 | 254 mm2019 · driest 2 mm in 1922 | 119 |
| October | 36.1°C4 Oct 1922 | -17.8°C29 Oct 1923 | 75 mm5 Oct 1911 | 172 mm1911 · driest 0 mm in 1958 | 118 |
| November | 29.4°C27 Nov 2017 | -26.1°C14 Nov 1940 | 58 mm2 Nov 1972 | 97 mm1972 · driest 0 mm in 1932 | 118 |
| December | 25.6°C11 Dec 1939 | -34.4°C22 Dec 1989 | 34 mm1 Dec 2018 | 80 mm1909 · driest 0 mm in 1905 | 115 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 29 | <1 | 3 |
| February | 0 | 0 | 25 | <1 | 4 |
| March | <1 | 0 | 22 | <1 | 3 |
| April | 3 | <1 | 11 | 2 | 2 |
| May | 10 | 2 | 1 | 3 | <1 |
| June | 22 | 9 | 0 | 3 | 0 |
| July | 29 | 17 | 0 | 2 | 0 |
| August | 27 | 14 | 0 | 3 | 0 |
| September | 18 | 7 | <1 | 2 | 0 |
| October | 5 | <1 | 7 | 1 | <1 |
| November | <1 | 0 | 21 | <1 | 2 |
| December | 0 | 0 | 29 | <1 | 3 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | <1% | 9% | <1% | 4% | -4.3–5.7°C |
| February | 2% | 12% | 2% | 6% | -1.2–8.3°C |
| March | 11% | 15% | 4% | 11% | 4.0–13.4°C |
| April | 30% | 21% | 7% | 21% | 12.5–19.1°C |
| May | 51% | 27% | 10% | 32% | 19.1–24.9°C |
| June | 69% | 28% | 11% | 30% | 24.6–30.5°C |
| July | 78% | 22% | 8% | 20% | 29.0–34.6°C |
| August | 79% | 20% | 7% | 16% | 27.7–32.8°C |
| September | 72% | 18% | 6% | 15% | 22.3–28.1°C |
| October | 43% | 13% | 4% | 8% | 15.3–21.6°C |
| November | 10% | 10% | 2% | 4% | 5.5–12.9°C |
| December | <1% | 10% | 1% | 5% | -2.0–6.8°C |
A warm and dry day reaches 20°C with under 1 mm of rain; a wet day gets 1 mm or more; a washout gets 10 mm or more. The week column is the share of seven-day stretches in that month, across the station’s whole daily record, that contained three or more wet days — the odds a week-long trip is rained on repeatedly, counted rather than modelled. The last column is the 10th to 90th percentile of that month’s daytime average across individual years: a narrow band means the average is what you will get, a wide one means the average is a midpoint between years that felt quite different.
The evidence behind this page