September
September · May · June
United States · 1991–2020
September leads for comfortable weather in Chamois: typically 25.8°C by day, 12.6°C at night, with 111 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 76 — days reach only 3.1°C, 21° 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 | 3.1°C | -7.2°C | 59 mm | 6.6 | 9 h 44 | 5 | Good coverage |
| February | 6.1°C | -5.1°C | 58 mm | 6 | 10 h 41 | 5 | Strong coverage |
| March | 12.3°C | -0.3°C | 75 mm | 8.4 | 11 h 50 | 23 | Strong coverage |
| April | 18.7°C | 5.7°C | 127 mm | 10.2 | 13 h 09 | 46 | Strong coverage |
| May | 23.4°C | 11.3°C | 125 mm | 10.7 | 14 h 15 | 72 | Strong coverage |
| June | 27.9°C | 16.3°C | 123 mm | 8.8 | 14 h 51 | 67 | Good coverage |
| July | 30.4°C | 18.6°C | 114 mm | 7.1 | 14 h 37 | 58 | Strong coverage |
| August | 30.3°C | 17.8°C | 97 mm | 6.4 | 13 h 40 | 62 | Strong coverage |
| September | 25.8°C | 12.6°C | 111 mm | 7.1 | 12 h 23 | 76 | Strong coverage |
| October | 19.7°C | 6.3°C | 92 mm | 7.5 | 11 h 07 | 58 | Strong coverage |
| November | 12°C | 0.7°C | 82 mm | 7.2 | 10 h 01 | 24 | Strong coverage |
| December | 5.7°C | -4.3°C | 60 mm | 6.6 | 9 h 28 | 5 | Strong coverage |
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 28.3°C23 Jan 1909 | -31.7°C13 Jan 1912 | 75 mm9 Jan 1901 | 170 mm2005 · driest 1 mm in 1986 | 112 |
| February | 27.2°C2 Feb 1911 | -32.2°C13 Feb 1905 | 57 mm10 Feb 1959 | 135 mm1998 · driest 1 mm in 2006 | 114 |
| March | 33.9°C23 Mar 1907 | -24.4°C12 Mar 1948 | 76 mm14 Mar 1922 | 250 mm1973 · driest 11 mm in 1956 | 114 |
| April | 34.4°C10 Apr 1930 | -10.6°C5 Apr 1920 | 102 mm29 Apr 1911 | 303 mm1922 · driest 22 mm in 1948 | 112 |
| May | 38.3°C31 May 1934 | -2.8°C1 May 1903 | 123 mm16 May 1990 | 314 mm1995 · driest 10 mm in 1901 | 113 |
| June | 41.1°C19 Jun 1936 | 3.9°C3 Jun 1910 | 102 mm22 Jun 1997 | 267 mm1985 · driest 2 mm in 1936 | 112 |
| July | 46.7°C15 Jul 1954 | 8.3°C16 Jul 1930 | 110 mm7 Jul 1993 | 344 mm1981 · driest 2 mm in 1976 | 113 |
| August | 42.8°C15 Aug 1936 | 3.9°C31 Aug 1915 | 136 mm12 Aug 1993 | 298 mm2000 · driest 2 mm in 1909 | 115 |
| September | 41.1°C4 Sep 1913 | -1.1°C27 Sep 1940 | 139 mm2 Sep 2014 | 375 mm1993 · driest 5 mm in 1974 | 115 |
| October | 35.6°C7 Oct 1939 | -7.8°C13 Oct 1917 | 129 mm18 Oct 1905 | 310 mm2009 · driest 0 mm in 1964 | 114 |
| November | 29.4°C1 Nov 1937 | -21.7°C30 Nov 1929 | 81 mm1 Nov 1946 | 256 mm1985 · driest 3 mm in 1904 | 114 |
| December | 24.4°C9 Dec 1991 | -29.4°C22 Dec 1989 | 71 mm5 Dec 1925 | 192 mm1982 · driest 5 mm in 1912 | 114 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 28 | 2 | 4 |
| February | 0 | 0 | 23 | 2 | 3 |
| March | 2 | 0 | 18 | 3 | 2 |
| April | 6 | <1 | 4 | 4 | <1 |
| May | 14 | 3 | 0 | 4 | 0 |
| June | 25 | 11 | 0 | 4 | 0 |
| July | 29 | 18 | 0 | 4 | 0 |
| August | 28 | 17 | 0 | 3 | 0 |
| September | 18 | 6 | 0 | 3 | 0 |
| October | 7 | <1 | 4 | 3 | 0 |
| November | <1 | 0 | 15 | 3 | <1 |
| December | 0 | 0 | 24 | 2 | 3 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | <1% | 18% | 5% | 15% | -0.2–7.7°C |
| February | 3% | 20% | 6% | 19% | 1.9–10.1°C |
| March | 16% | 25% | 9% | 26% | 7.9–16.6°C |
| April | 34% | 30% | 12% | 37% | 15.8–21.4°C |
| May | 56% | 32% | 13% | 41% | 21.4–26.9°C |
| June | 71% | 28% | 12% | 32% | 26.3–31.6°C |
| July | 78% | 23% | 10% | 20% | 28.8–34.2°C |
| August | 78% | 22% | 9% | 22% | 28.4–33.9°C |
| September | 72% | 23% | 10% | 21% | 24.2–30.2°C |
| October | 48% | 21% | 9% | 21% | 18.1–23.4°C |
| November | 13% | 21% | 8% | 19% | 9.0–15.5°C |
| December | 2% | 20% | 6% | 17% | 2.3–9.0°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