September
September · June · May
United States · 1991–2020
September leads for comfortable weather in Cheat Lake: typically 25°C by day, 13.3°C at night, with 88 mm of rain. Based on measured 1991–2020 NOAA station history.
September · June · May
August · July · June
October · April · May
The weakest month is January, scoring 5 against September’s 81 — days reach only 4.5°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 | 4.5°C | -4.4°C | 79 mm | 10.7 | 9 h 39 | 5 | Strong coverage |
| February | 6.5°C | -3.4°C | 72 mm | 9.4 | 10 h 38 | 5 | Strong coverage |
| March | 11.4°C | 0.3°C | 93 mm | 10.9 | 11 h 49 | 17 | Strong coverage |
| April | 18.5°C | 5.8°C | 98 mm | 11.7 | 13 h 11 | 49 | Strong coverage |
| May | 23.1°C | 10.9°C | 109 mm | 11.9 | 14 h 20 | 71 | Strong coverage |
| June | 27.1°C | 15.5°C | 104 mm | 10.9 | 14 h 58 | 72 | Strong coverage |
| July | 29.1°C | 17.7°C | 125 mm | 9.8 | 14 h 43 | 60 | Strong coverage |
| August | 28.4°C | 17°C | 93 mm | 8.4 | 13 h 44 | 69 | Strong coverage |
| September | 25°C | 13.3°C | 88 mm | 8.4 | 12 h 24 | 81 | Strong coverage |
| October | 18.8°C | 7.2°C | 80 mm | 9 | 11 h 05 | 57 | Strong coverage |
| November | 12.3°C | 2.2°C | 77 mm | 9.3 | 9 h 56 | 27 | Strong coverage |
| December | 6.7°C | -1.8°C | 83 mm | 10 | 9 h 23 | 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 | 24.2°C1 Jan 1892 | -28.9°C16 Jan 1972 | 43 mm11 Jan 2005 | 207 mm1950 · driest 16 mm in 1967 | 88 |
| February | 25.6°C20 Feb 2018 | -23.3°C17 Feb 1973 | 69 mm18 Feb 2000 | 180 mm1883 · driest 16 mm in 1968 | 88 |
| March | 30.0°C23 Mar 1966 | -19.3°C6 Mar 2015 | 55 mm6 Mar 1967 | 185 mm1967 · driest 25 mm in 1958 | 86 |
| April | 33.3°C18 Apr 1976 | -10.0°C10 Apr 1985 | 67 mm12 Apr 1948 | 184 mm2011 · driest 29 mm in 1971 | 86 |
| May | 35.0°C26 May 1878 | -3.9°C10 May 1947 | 74 mm30 May 2025 | 227 mm2003 · driest 31 mm in 2015 | 86 |
| June | 36.7°C29 Jun 2012 | -1.1°C11 Jun 1972 | 70 mm23 Jun 1972 | 239 mm1972 · driest 22 mm in 1966 | 85 |
| July | 42.2°C25 Jul 1892 | 5.0°C1 Jul 1988 | 110 mm18 Jul 1996 | 304 mm2003 · driest 35 mm in 1995 | 88 |
| August | 37.2°C31 Aug 1953 | 3.3°C29 Aug 1982 | 127 mm5 Aug 1956 | 271 mm1954 · driest 10 mm in 1881 | 87 |
| September | 38.9°C3 Sep 1953 | -1.1°C24 Sep 1983 | 70 mm9 Sep 2018 | 229 mm2018 · driest 18 mm in 2007 | 87 |
| October | 36.7°C2 Oct 1891 | -8.3°C24 Oct 1969 | 107 mm9 Oct 1979 | 186 mm1979 · driest 6 mm in 1963 | 87 |
| November | 28.3°C5 Nov 1948 | -16.1°C30 Nov 1958 | 89 mm4 Nov 1985 | 276 mm1985 · driest 17 mm in 2012 | 89 |
| December | 25.0°C9 Dec 1966 | -25.0°C25 Dec 1983 | 57 mm18 Dec 1990 | 185 mm1990 · driest 16 mm in 1965 | 88 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 23 | 3 | 5 |
| February | <1 | 0 | 21 | 2 | 3 |
| March | <1 | 0 | 16 | 3 | 4 |
| April | 6 | <1 | 5 | 4 | <1 |
| May | 13 | 3 | <1 | 4 | 0 |
| June | 23 | 8 | 0 | 4 | 0 |
| July | 28 | 13 | 0 | 4 | 0 |
| August | 27 | 11 | 0 | 3 | 0 |
| September | 16 | 5 | 0 | 3 | 0 |
| October | 5 | <1 | 2 | 3 | <1 |
| November | <1 | 0 | 12 | 2 | 1 |
| December | 0 | 0 | 21 | 3 | 4 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | <1% | 36% | 8% | 50% | 0.3–8.2°C |
| February | 2% | 34% | 8% | 45% | 1.9–9.8°C |
| March | 11% | 36% | 10% | 52% | 7.9–14.8°C |
| April | 28% | 38% | 10% | 52% | 15.3–20.1°C |
| May | 48% | 37% | 12% | 50% | 20.1–25.8°C |
| June | 64% | 34% | 13% | 43% | 24.7–28.7°C |
| July | 67% | 34% | 14% | 43% | 27.1–30.9°C |
| August | 71% | 29% | 12% | 33% | 26.3–29.7°C |
| September | 64% | 28% | 10% | 31% | 22.4–27.1°C |
| October | 37% | 26% | 8% | 30% | 16.6–21.2°C |
| November | 9% | 32% | 9% | 40% | 8.7–14.6°C |
| December | 1% | 34% | 9% | 48% | 1.9–10.4°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