September
September · May · October
United States · 1991–2020
September leads for comfortable weather in Bosky Dell: typically 26.7°C by day, 13.5°C at night, with 106 mm of rain. Based on measured 1991–2020 NOAA station history.
September · May · October
August · July · June
October · April · March
The weakest month is January, scoring 8 against September’s 76 — days reach only 7.9°C, 16° below the 24°C the score treats as ideal, and nights drop to -3.9°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 | 7.9°C | -3.9°C | 58 mm | 4.4 | 9 h 55 | 8 | Good coverage |
| February | 11°C | -2.1°C | 51 mm | 4.5 | 10 h 47 | 23 | Good coverage |
| March | 15.6°C | 1.9°C | 84 mm | 6.6 | 11 h 51 | 38 | Good coverage |
| April | 20.9°C | 7°C | 112 mm | 6.8 | 13 h 04 | 61 | Good coverage |
| May | 24.5°C | 12.2°C | 142 mm | 8.5 | 14 h 06 | 74 | Good coverage |
| June | 28°C | 16.6°C | 136 mm | 7.9 | 14 h 39 | 65 | Good coverage |
| July | 30.9°C | 19.3°C | 89 mm | 5.8 | 14 h 26 | 59 | Good coverage |
| August | 31.4°C | 18.5°C | 66 mm | 4.5 | 13 h 33 | 64 | Good coverage |
| September | 26.7°C | 13.5°C | 106 mm | 5.5 | 12 h 22 | 76 | Good coverage |
| October | 21.4°C | 7.6°C | 77 mm | 6 | 11 h 11 | 70 | Good coverage |
| November | 14.6°C | 2°C | 108 mm | 6.3 | 10 h 10 | 32 | Good coverage |
| December | 9.3°C | -2.7°C | 68 mm | 5 | 9 h 40 | 13 | Good coverage |
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 25.6°C25 Jan 1950 | -29.4°C19 Jan 1984 | 96 mm5 Jan 2005 | 176 mm2005 · driest 0 mm in 1986 | 64 |
| February | 30.0°C22 Feb 1996 | -29.4°C4 Feb 1996 | 77 mm21 Feb 1997 | 163 mm1951 · driest 4 mm in 1963 | 64 |
| March | 32.2°C31 Mar 1974 | -26.1°C12 Mar 1948 | 105 mm18 Mar 2008 | 274 mm1973 · driest 12 mm in 1956 | 64 |
| April | 34.4°C2 Apr 1946 | -14.4°C13 Apr 1957 | 109 mm3 Apr 1965 | 328 mm1945 · driest 5 mm in 1989 | 64 |
| May | 33.9°C31 May 1951 | -4.4°C3 May 1997 | 102 mm7 May 1961 | 408 mm1961 · driest 51 mm in 1964 | 64 |
| June | 38.3°C19 Jun 1953 | 3.9°C2 Jun 1956 | 139 mm3 Jun 2001 | 292 mm1948 · driest 12 mm in 1953 | 64 |
| July | 44.4°C14 Jul 1954 | 6.7°C6 Jul 1972 | 111 mm6 Jul 1993 | 287 mm1958 · driest 4 mm in 1943 | 65 |
| August | 42.2°C17 Aug 1956 | 5.6°C29 Aug 1986 | 102 mm14 Aug 1980 | 210 mm1952 · driest 0 mm in 1995 | 64 |
| September | 40.0°C4 Sep 1947 | -2.8°C30 Sep 1984 | 131 mm30 Sep 1986 | 309 mm1986 · driest 0 mm in 1952 | 64 |
| October | 35.6°C1 Oct 1953 | -10.6°C29 Oct 1952 | 97 mm5 Oct 1998 | 231 mm1984 · driest 1 mm in 1963 | 64 |
| November | 32.8°C1 Nov 1946 | -17.8°C29 Nov 1976 | 133 mm1 Nov 2004 | 267 mm2004 · driest 1 mm in 1950 | 63 |
| December | 26.7°C14 Dec 1948 | -27.8°C30 Dec 1983 | 67 mm14 Dec 1992 | 175 mm1990 · driest 6 mm in 1996 | 64 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 23 | 2 | 2 |
| February | <1 | <1 | 20 | 2 | 1 |
| March | 2 | <1 | 13 | 3 | <1 |
| April | 8 | <1 | 4 | 4 | 0 |
| May | 16 | 2 | <1 | 5 | 0 |
| June | 25 | 9 | 0 | 4 | 0 |
| July | 30 | 22 | 0 | 3 | 0 |
| August | 30 | 22 | 0 | 2 | 0 |
| September | 20 | 8 | <1 | 3 | 0 |
| October | 9 | 1 | 3 | 2 | <1 |
| November | <1 | 0 | 13 | 3 | <1 |
| December | 0 | 0 | 22 | 3 | 1 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 4% | 15% | 5% | 11% | 4.7–11.1°C |
| February | 10% | 20% | 6% | 18% | 7.1–13.8°C |
| March | 25% | 23% | 10% | 22% | 11.9–18.5°C |
| April | 52% | 26% | 12% | 25% | 19.0–24.0°C |
| May | 64% | 29% | 15% | 35% | 23.0–26.4°C |
| June | 73% | 27% | 13% | 29% | 26.8–31.0°C |
| July | 81% | 19% | 9% | 14% | 29.8–33.7°C |
| August | 82% | 18% | 9% | 15% | 29.2–34.4°C |
| September | 75% | 22% | 11% | 22% | 24.9–30.1°C |
| October | 59% | 19% | 9% | 19% | 19.7–24.2°C |
| November | 24% | 18% | 10% | 14% | 11.9–17.7°C |
| December | 4% | 17% | 7% | 15% | 6.8–12.1°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