September
September · August · June
United States · 1991–2020
September leads for comfortable weather in Clover Run (historical): typically 24.2°C by day, 11.4°C at night, with 102 mm of rain. Based on measured 1991–2020 NOAA station history.
September · August · June
August · July · September
September · October · May
The weakest month is January, scoring 5 against September’s 78 — days reach only 3.8°C, 20° 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 | 3.8°C | -6.7°C | 104 mm | 14.7 | 9 h 42 | 5 | Strong coverage |
| February | 5.9°C | -5.7°C | 99 mm | 12.7 | 10 h 40 | 5 | Strong coverage |
| March | 10.8°C | -2°C | 118 mm | 13.1 | 11 h 50 | 5 | Strong coverage |
| April | 17.5°C | 2.8°C | 126 mm | 12.8 | 13 h 10 | 35 | Strong coverage |
| May | 22.1°C | 8.5°C | 146 mm | 13.7 | 14 h 17 | 57 | Strong coverage |
| June | 26°C | 13.3°C | 153 mm | 12.6 | 14 h 54 | 65 | Strong coverage |
| July | 27.9°C | 15.7°C | 164 mm | 12.4 | 14 h 39 | 59 | Strong coverage |
| August | 27.5°C | 15.4°C | 123 mm | 11.2 | 13 h 42 | 68 | Strong coverage |
| September | 24.2°C | 11.4°C | 102 mm | 9.5 | 12 h 24 | 78 | Strong coverage |
| October | 18°C | 4.6°C | 99 mm | 10 | 11 h 06 | 46 | Strong coverage |
| November | 11.6°C | -0.8°C | 90 mm | 9.8 | 9 h 59 | 17 | Strong coverage |
| December | 5.8°C | -4.3°C | 108 mm | 13.4 | 9 h 26 | 5 | Strong coverage |
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 26.7°C29 Jan 1914 | -33.3°C13 Jan 1912 | 81 mm29 Jan 1911 | 340 mm1911 · driest 27 mm in 1967 | 114 |
| February | 27.8°C11 Feb 1932 | -27.8°C10 Feb 1899 | 94 mm9 Feb 1994 | 245 mm2018 · driest 23 mm in 1968 | 113 |
| March | 31.1°C25 Mar 1929 | -22.2°C20 Mar 1914 | 102 mm19 Mar 1932 | 242 mm1967 · driest 23 mm in 1901 | 109 |
| April | 36.7°C25 Apr 1925 | -17.8°C1 Apr 1923 | 116 mm20 Apr 1940 | 256 mm2011 · driest 15 mm in 1902 | 111 |
| May | 35.0°C10 May 1936 | -6.1°C10 May 1947 | 112 mm8 May 1908 | 276 mm1996 · driest 27 mm in 1914 | 108 |
| June | 38.9°C5 Jun 1925 | -1.1°C11 Jun 1972 | 121 mm19 Jun 1910 | 335 mm2018 · driest 4 mm in 1899 | 108 |
| July | 38.9°C26 Jul 1934 | 2.2°C1 Jul 1988 | 119 mm17 Jul 1907 | 356 mm1912 · driest 30 mm in 1997 | 108 |
| August | 38.9°C4 Aug 1930 | 2.2°C12 Aug 1930 | 140 mm19 Aug 1921 | 225 mm1935 · driest 0 mm in 1915 | 107 |
| September | 37.8°C1 Sep 1932 | -2.2°C29 Sep 1914 | 84 mm26 Sep 1940 | 296 mm2018 · driest 6 mm in 1921 | 107 |
| October | 32.2°C6 Oct 1910 | -11.1°C27 Oct 1962 | 152 mm11 Oct 1925 | 240 mm1925 · driest 2 mm in 1952 | 106 |
| November | 27.8°C3 Nov 1946 | -21.7°C29 Nov 1930 | 132 mm5 Nov 1985 | 302 mm1985 · driest 0 mm in 1921 | 107 |
| December | 23.9°C10 Dec 1966 | -32.2°C30 Dec 1917 | 134 mm29 Dec 1926 | 207 mm1972 · driest 16 mm in 1925 | 106 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 25 | 3 | 8 |
| February | <1 | 0 | 23 | 3 | 6 |
| March | <1 | 0 | 20 | 4 | 4 |
| April | 5 | <1 | 10 | 4 | 1 |
| May | 11 | 2 | 1 | 5 | 0 |
| June | 19 | 4 | 0 | 5 | 0 |
| July | 24 | 8 | 0 | 5 | 0 |
| August | 24 | 7 | 0 | 5 | 0 |
| September | 15 | 2 | 0 | 3 | 0 |
| October | 4 | 0 | 7 | 4 | <1 |
| November | <1 | 0 | 18 | 3 | 2 |
| December | 0 | 0 | 24 | 4 | 6 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 1% | 39% | 12% | 52% | 0.5–8.5°C |
| February | 2% | 37% | 11% | 51% | 2.3–9.3°C |
| March | 10% | 39% | 13% | 54% | 6.7–14.7°C |
| April | 28% | 37% | 14% | 47% | 14.4–20.0°C |
| May | 49% | 35% | 14% | 43% | 19.7–25.4°C |
| June | 62% | 34% | 16% | 43% | 24.2–28.7°C |
| July | 66% | 34% | 16% | 43% | 26.4–30.4°C |
| August | 70% | 30% | 13% | 33% | 25.9–29.8°C |
| September | 64% | 26% | 11% | 28% | 22.1–27.1°C |
| October | 39% | 26% | 10% | 30% | 15.9–21.5°C |
| November | 9% | 30% | 10% | 37% | 9.3–14.8°C |
| December | <1% | 35% | 11% | 46% | 2.2–9.3°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