September
September · May · June
United States · 1991–2020
September leads for comfortable weather in Ranson: typically 25.7°C by day, 13.2°C at night, with 102 mm of rain. Based on measured 1991–2020 NOAA station history.
September · May · June
August · July · June
October · April · May
The weakest month is January, scoring 5 against September’s 78 — days reach only 5.2°C, 19° below the 24°C the score treats as ideal.
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 | 5.2°C | -4.5°C | 69 mm | 8 | 9 h 41 | 5 | Strong coverage |
| February | 7.1°C | -3.4°C | 60 mm | 7.3 | 10 h 39 | 5 | Strong coverage |
| March | 12°C | 0.4°C | 88 mm | 8.4 | 11 h 50 | 22 | Strong coverage |
| April | 18.7°C | 5.7°C | 86 mm | 8.9 | 13 h 11 | 53 | Strong coverage |
| May | 23.5°C | 10.8°C | 104 mm | 10.4 | 14 h 18 | 74 | Strong coverage |
| June | 28.1°C | 15.7°C | 103 mm | 8.8 | 14 h 55 | 70 | Strong coverage |
| July | 30.5°C | 18.3°C | 95 mm | 8.5 | 14 h 41 | 59 | Strong coverage |
| August | 29.5°C | 17.3°C | 78 mm | 7.6 | 13 h 42 | 68 | Strong coverage |
| September | 25.7°C | 13.2°C | 102 mm | 7.8 | 12 h 24 | 78 | Strong coverage |
| October | 19.3°C | 6.7°C | 76 mm | 6.8 | 11 h 06 | 61 | Strong coverage |
| November | 13°C | 1.5°C | 70 mm | 6.4 | 9 h 58 | 31 | Strong coverage |
| December | 7.2°C | -2.5°C | 79 mm | 7.5 | 9 h 25 | 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 | 26.7°C14 Jan 1932 | -28.3°C14 Jan 1912 | 60 mm5 Jan 1914 | 161 mm1996 · driest 6 mm in 1955 | 133 |
| February | 28.3°C21 Feb 2018 | -25.0°C10 Feb 1899 | 74 mm14 Feb 1984 | 154 mm2003 · driest 3 mm in 2002 | 134 |
| March | 32.2°C23 Mar 1907 | -19.4°C15 Mar 1993 | 103 mm27 Mar 1913 | 198 mm1993 · driest 4 mm in 1910 | 134 |
| April | 38.3°C24 Apr 1925 | -7.2°C2 Apr 1907 | 102 mm26 Apr 1937 | 219 mm1918 · driest 4 mm in 1985 | 134 |
| May | 37.8°C23 May 1925 | -3.3°C11 May 1966 | 130 mm22 May 1901 | 269 mm1921 · driest 9 mm in 1900 | 135 |
| June | 43.3°C2 Jun 1925 | 2.2°C1 Jun 1930 | 94 mm3 Jun 1915 | 234 mm2003 · driest 17 mm in 1994 | 135 |
| July | 44.4°C11 Jul 1936 | 5.0°C1 Jul 1943 | 78 mm2 Jul 1981 | 236 mm1905 · driest 9 mm in 1983 | 135 |
| August | 42.2°C5 Aug 1930 | 3.3°C22 Aug 1925 | 116 mm31 Aug 1911 | 281 mm2024 · driest 0 mm in 2025 | 134 |
| September | 39.4°C2 Sep 1932 | -1.7°C24 Sep 1963 | 157 mm24 Sep 1912 | 241 mm1945 · driest 4 mm in 2005 | 134 |
| October | 36.7°C6 Oct 1941 | -8.3°C24 Oct 1969 | 105 mm15 Oct 1942 | 264 mm1942 · driest 2 mm in 1963 | 134 |
| November | 30.0°C1 Nov 1974 | -14.4°C29 Nov 1930 | 85 mm7 Nov 1997 | 199 mm1997 · driest 8 mm in 1998 | 134 |
| December | 25.6°C6 Dec 1998 | -24.4°C25 Dec 1983 | 95 mm1 Dec 1974 | 162 mm1974 · driest 5 mm in 1955 | 133 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 25 | 2 | 4 |
| February | <1 | 0 | 22 | 2 | 3 |
| March | 1 | <1 | 16 | 3 | 2 |
| April | 5 | 1 | 4 | 3 | 0 |
| May | 13 | 4 | <1 | 4 | 0 |
| June | 25 | 11 | 0 | 4 | 0 |
| July | 30 | 19 | 0 | 3 | 0 |
| August | 29 | 16 | 0 | 2 | 0 |
| September | 17 | 6 | <1 | 3 | 0 |
| October | 5 | <1 | 3 | 3 | 0 |
| November | <1 | 0 | 13 | 2 | <1 |
| December | <1 | 0 | 23 | 3 | 2 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 1% | 25% | 7% | 24% | 0.9–8.4°C |
| February | 2% | 25% | 7% | 25% | 1.8–9.9°C |
| March | 11% | 28% | 9% | 29% | 8.5–14.9°C |
| April | 31% | 28% | 9% | 32% | 15.8–20.5°C |
| May | 56% | 31% | 11% | 38% | 21.4–26.3°C |
| June | 69% | 29% | 11% | 33% | 26.5–30.0°C |
| July | 73% | 28% | 10% | 31% | 28.9–32.9°C |
| August | 74% | 26% | 9% | 26% | 27.8–31.3°C |
| September | 71% | 23% | 8% | 21% | 23.7–28.3°C |
| October | 39% | 21% | 8% | 18% | 17.2–21.5°C |
| November | 10% | 22% | 7% | 18% | 10.2–15.2°C |
| December | 1% | 23% | 8% | 21% | 3.0–9.4°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