September
September · May · June
United States · 1991–2020
September leads for comfortable weather in Big Clifty: typically 26.5°C by day, 12.8°C at night, with 81 mm of rain. Based on measured 1991–2020 NOAA station history.
September · May · June
August · July · June
October · April · September
The weakest month is January, scoring 5 against September’s 77 — days reach only 6.2°C, 18° below the 24°C the score treats as ideal, and nights drop to -4.9°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 | 6.2°C | -4.9°C | 101 mm | 9.2 | 9 h 50 | 5 | Strong coverage |
| February | 8.7°C | -3.6°C | 98 mm | 7.9 | 10 h 45 | 5 | Good coverage |
| March | 13.6°C | 0.4°C | 120 mm | 9.3 | 11 h 50 | 22 | Strong coverage |
| April | 20.4°C | 5.8°C | 134 mm | 9.7 | 13 h 07 | 52 | Strong coverage |
| May | 24.4°C | 11.2°C | 127 mm | 9.4 | 14 h 10 | 73 | Strong coverage |
| June | 28.2°C | 16.1°C | 114 mm | 9.7 | 14 h 44 | 67 | Good coverage |
| July | 30.1°C | 18.3°C | 122 mm | 8.8 | 14 h 31 | 57 | Good coverage |
| August | 29.9°C | 17°C | 86 mm | 6.4 | 13 h 36 | 67 | Strong coverage |
| September | 26.5°C | 12.8°C | 81 mm | 7.2 | 12 h 23 | 77 | Good coverage |
| October | 20.8°C | 6.5°C | 96 mm | 6.8 | 11 h 09 | 62 | Strong coverage |
| November | 13.9°C | 0.7°C | 87 mm | 7.7 | 10 h 06 | 30 | Good coverage |
| December | 8°C | -3°C | 109 mm | 9 | 9 h 35 | 5 | Good coverage |
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 26.7°C24 Jan 1943 | -32.8°C19 Jan 1994 | 122 mm11 Jan 1913 | 555 mm1937 · driest 10 mm in 2016 | 123 |
| February | 26.1°C13 Feb 1962 | -32.2°C13 Feb 1899 | 135 mm14 Feb 1989 | 381 mm1989 · driest 0 mm in 2015 | 123 |
| March | 31.1°C24 Mar 1929 | -22.8°C6 Mar 2015 | 141 mm2 Mar 1997 | 349 mm1997 · driest 6 mm in 1918 | 122 |
| April | 32.2°C18 Apr 1896 | -7.2°C7 Apr 1990 | 108 mm30 Apr 1911 | 269 mm2011 · driest 1 mm in 2018 | 122 |
| May | 36.1°C31 May 1937 | -1.7°C4 May 1976 | 141 mm15 May 1986 | 275 mm1995 · driest 16 mm in 1941 | 121 |
| June | 40.6°C29 Jun 1936 | 1.1°C3 Jun 1946 | 98 mm28 Jun 1973 | 368 mm1928 · driest 17 mm in 1936 | 120 |
| July | 42.2°C28 Jul 1930 | 6.7°C2 Jul 1988 | 93 mm6 Jul 1946 | 236 mm1906 · driest 0 mm in 2011 | 120 |
| August | 41.7°C8 Aug 1930 | 6.1°C29 Aug 1986 | 96 mm14 Aug 1921 | 234 mm2005 · driest 11 mm in 2008 | 119 |
| September | 40.6°C1 Sep 1953 | -2.2°C30 Sep 1899 | 153 mm14 Sep 1979 | 338 mm1979 · driest 0 mm in 1897 | 119 |
| October | 34.4°C6 Oct 1919 | -7.8°C28 Oct 1976 | 102 mm22 Oct 2007 | 253 mm2007 · driest 0 mm in 1908 | 120 |
| November | 28.3°C1 Nov 2000 | -20.6°C25 Nov 1950 | 132 mm20 Nov 1900 | 316 mm1957 · driest 9 mm in 1912 | 122 |
| December | 23.9°C2 Dec 1982 | -27.2°C22 Dec 1989 | 157 mm15 Dec 1902 | 306 mm1978 · driest 14 mm in 2017 | 123 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 20 | 3 | 3 |
| February | <1 | 0 | 19 | 3 | 2 |
| March | 1 | 0 | 15 | 3 | 1 |
| April | 6 | <1 | 5 | 4 | 0 |
| May | 15 | 2 | <1 | 4 | 0 |
| June | 23 | 10 | 0 | 3 | 0 |
| July | 26 | 16 | 0 | 3 | 0 |
| August | 27 | 15 | 0 | 3 | 0 |
| September | 18 | 6 | <1 | 2 | 0 |
| October | 7 | <1 | 4 | 3 | 0 |
| November | <1 | 0 | 13 | 3 | <1 |
| December | 0 | 0 | 19 | 3 | 2 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 1% | 30% | 13% | 31% | 2.4–9.8°C |
| February | 3% | 29% | 12% | 32% | 4.6–12.1°C |
| March | 16% | 31% | 14% | 37% | 9.9–17.2°C |
| April | 40% | 31% | 13% | 36% | 17.9–22.7°C |
| May | 62% | 30% | 13% | 36% | 22.5–27.1°C |
| June | 71% | 29% | 12% | 31% | 27.0–31.2°C |
| July | 74% | 26% | 12% | 24% | 28.9–33.4°C |
| August | 78% | 22% | 10% | 20% | 28.2–32.6°C |
| September | 74% | 22% | 10% | 19% | 24.8–30.0°C |
| October | 52% | 20% | 8% | 20% | 19.2–24.0°C |
| November | 15% | 26% | 11% | 26% | 11.1–16.7°C |
| December | 1% | 28% | 12% | 32% | 4.7–11.7°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