September
September · August · July
United States · 1991–2020
September leads for comfortable weather in Richland Center: typically 23°C by day, 8.8°C at night, with 88 mm of rain. Based on measured 1991–2020 NOAA station history.
September · August · July
July · August · June
September · May · October
The weakest month is January, scoring 5 against September’s 74 — days reach only -2.3°C, 26° 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 | -2.3°C | -13.7°C | 30 mm | 6 | 9 h 18 | 5 | Strong coverage |
| February | -0.1°C | -12°C | 28 mm | 5 | 10 h 26 | 5 | Good coverage |
| March | 6.8°C | -5.9°C | 47 mm | 6 | 11 h 47 | 5 | Good coverage |
| April | 14.3°C | 0.7°C | 110 mm | 9.4 | 13 h 21 | 26 | Good coverage |
| May | 20.9°C | 6.8°C | 111 mm | 10.4 | 14 h 39 | 58 | Good coverage |
| June | 26°C | 12.9°C | 153 mm | 9.5 | 15 h 23 | 67 | Good coverage |
| July | 27.9°C | 15°C | 119 mm | 8.2 | 15 h 06 | 71 | Good coverage |
| August | 27.2°C | 14.1°C | 118 mm | 8.1 | 13 h 57 | 72 | Good coverage |
| September | 23°C | 8.8°C | 88 mm | 7.9 | 12 h 27 | 74 | Good coverage |
| October | 16.2°C | 2.3°C | 62 mm | 6.9 | 10 h 57 | 44 | Strong coverage |
| November | 7.5°C | -3.8°C | 50 mm | 5.6 | 9 h 38 | 7 | Good coverage |
| December | 0.3°C | -10.2°C | 34 mm | 5.9 | 8 h 59 | 5 | Good coverage |
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 14.4°C26 Jan 2002 | -43.3°C30 Jan 1951 | 31 mm5 Jan 1946 | 84 mm1929 · driest 2 mm in 1948 | 96 |
| February | 19.4°C15 Feb 1921 | -40.0°C20 Feb 1929 | 46 mm22 Feb 1922 | 91 mm1971 · driest 1 mm in 1996 | 94 |
| March | 28.9°C30 Mar 1986 | -34.4°C1 Mar 1962 | 84 mm31 Mar 1998 | 157 mm1998 · driest 0 mm in 1996 | 95 |
| April | 33.9°C23 Apr 1980 | -17.8°C6 Apr 1982 | 76 mm3 Apr 1999 | 301 mm1999 · driest 18 mm in 1946 | 94 |
| May | 39.4°C31 May 1934 | -6.1°C4 May 1935 | 94 mm18 May 2000 | 261 mm2001 · driest 6 mm in 1925 | 94 |
| June | 39.4°C21 Jun 1988 | -0.6°C4 Jun 1945 | 120 mm28 Jun 1967 | 285 mm1967 · driest 16 mm in 1988 | 96 |
| July | 43.3°C14 Jul 1936 | 3.3°C6 Jul 1972 | 125 mm1 Jul 1978 | 325 mm1978 · driest 6 mm in 1937 | 93 |
| August | 38.9°C3 Aug 1930 | 0.6°C28 Aug 1986 | 138 mm2 Aug 2001 | 529 mm2007 · driest 10 mm in 1970 | 94 |
| September | 40.0°C10 Sep 1908 | -5.6°C28 Sep 1942 | 114 mm1 Sep 2010 | 309 mm1961 · driest 7 mm in 1979 | 95 |
| October | 32.8°C2 Oct 1976 | -16.1°C30 Oct 1925 | 150 mm22 Oct 1943 | 167 mm1943 · driest 2 mm in 1952 | 95 |
| November | 25.6°C1 Nov 1933 | -27.2°C30 Nov 1947 | 78 mm12 Nov 1982 | 155 mm1982 · driest 1 mm in 1962 | 94 |
| December | 17.8°C6 Dec 1998 | -35.0°C27 Dec 1950 | 41 mm2 Dec 2007 | 90 mm2007 · driest 7 mm in 1929 | 94 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 30 | <1 | 7 |
| February | 0 | 0 | 27 | <1 | 6 |
| March | <1 | 0 | 26 | 1 | 3 |
| April | 2 | <1 | 14 | 4 | <1 |
| May | 8 | 1 | 2 | 4 | 0 |
| June | 20 | 6 | 0 | 5 | 0 |
| July | 26 | 10 | 0 | 4 | 0 |
| August | 24 | 7 | 0 | 3 | 0 |
| September | 12 | 3 | 1 | 3 | 0 |
| October | 3 | <1 | 12 | 2 | <1 |
| November | 0 | 0 | 23 | 2 | 2 |
| December | 0 | 0 | 29 | 1 | 6 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 0% | 18% | 2% | 12% | -6.5–1.3°C |
| February | 0% | 16% | 3% | 12% | -3.5–4.5°C |
| March | 4% | 21% | 5% | 20% | 3.3–10.2°C |
| April | 18% | 28% | 9% | 34% | 12.2–18.1°C |
| May | 47% | 30% | 11% | 37% | 19.2–24.7°C |
| June | 66% | 31% | 13% | 37% | 24.5–29.0°C |
| July | 76% | 24% | 10% | 22% | 26.9–31.5°C |
| August | 75% | 24% | 11% | 22% | 25.9–30.4°C |
| September | 57% | 27% | 11% | 31% | 21.4–25.8°C |
| October | 28% | 21% | 6% | 20% | 14.2–20.4°C |
| November | 2% | 21% | 6% | 18% | 4.8–10.4°C |
| December | 0% | 18% | 3% | 15% | -3.4–3.5°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