September
September · May · October
United States · 1991–2020
September leads for comfortable weather in Advance Mills: typically 26.4°C by day, 14.6°C at night, with 104 mm of rain. Based on measured 1991–2020 NOAA station history.
September · May · October
August · July · June
October · April · May
The weakest month is January, scoring 6 against September’s 78 — days reach only 7.7°C, 16° 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 | 7.7°C | -2.4°C | 76 mm | 7.1 | 9 h 47 | 6 | Strong coverage |
| February | 9.9°C | -1.3°C | 63 mm | 6.4 | 10 h 43 | 17 | Strong coverage |
| March | 14.5°C | 2.3°C | 86 mm | 7.7 | 11 h 50 | 34 | Strong coverage |
| April | 20.6°C | 7.3°C | 82 mm | 8 | 13 h 08 | 64 | Strong coverage |
| May | 24.6°C | 12.2°C | 102 mm | 10.1 | 14 h 13 | 77 | Strong coverage |
| June | 28.9°C | 17°C | 102 mm | 8.5 | 14 h 48 | 66 | Strong coverage |
| July | 31.1°C | 19.4°C | 98 mm | 9.1 | 14 h 34 | 54 | Strong coverage |
| August | 30°C | 18.5°C | 87 mm | 7.3 | 13 h 38 | 63 | Strong coverage |
| September | 26.4°C | 14.6°C | 104 mm | 7 | 12 h 23 | 78 | Strong coverage |
| October | 20.8°C | 8.1°C | 84 mm | 5.7 | 11 h 08 | 68 | Strong coverage |
| November | 14.7°C | 2.8°C | 86 mm | 6.3 | 10 h 03 | 37 | Strong coverage |
| December | 9.6°C | -0.7°C | 81 mm | 7.3 | 9 h 31 | 14 | 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 | 27.2°C30 Jan 2002 | -21.1°C17 Jan 1982 | 104 mm28 Jan 1998 | 229 mm1978 · driest 2 mm in 1981 | 71 |
| February | 27.8°C23 Feb 2023 | -19.4°C5 Feb 1996 | 78 mm14 Feb 1984 | 185 mm2003 · driest 6 mm in 1978 | 71 |
| March | 32.8°C30 Mar 1998 | -17.1°C4 Mar 2014 | 71 mm19 Mar 1975 | 185 mm1975 · driest 6 mm in 2006 | 71 |
| April | 34.4°C17 Apr 1976 | -5.6°C7 Apr 1982 | 73 mm16 Apr 1987 | 220 mm1983 · driest 6 mm in 1976 | 70 |
| May | 36.1°C19 May 1962 | -1.7°C22 May 2002 | 102 mm28 May 1982 | 245 mm2018 · driest 19 mm in 1997 | 71 |
| June | 40.0°C29 Jun 2012 | 5.6°C1 Jun 1966 | 149 mm21 Jun 1972 | 237 mm1972 · driest 8 mm in 1980 | 71 |
| July | 41.1°C8 Jul 2012 | 6.7°C8 Jul 1983 | 85 mm1 Jul 1981 | 241 mm1970 · driest 9 mm in 1994 | 71 |
| August | 39.4°C17 Aug 1988 | 5.6°C29 Aug 1986 | 105 mm9 Aug 2024 | 276 mm1961 · driest 10 mm in 1989 | 70 |
| September | 37.2°C6 Sep 1998 | 1.7°C24 Sep 1963 | 183 mm6 Sep 1996 | 322 mm1996 · driest 3 mm in 1982 | 71 |
| October | 36.1°C3 Oct 2019 | -3.9°C24 Oct 1969 | 234 mm5 Oct 1972 | 318 mm1976 · driest 0 mm in 2000 | 71 |
| November | 30.6°C2 Nov 2016 | -10.0°C24 Nov 1956 | 74 mm21 Nov 2023 | 243 mm1985 · driest 8 mm in 1981 | 71 |
| December | 26.7°C7 Dec 1998 | -18.9°C23 Dec 1989 | 64 mm10 Dec 1992 | 195 mm2009 · driest 3 mm in 1965 | 71 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) |
|---|---|---|---|---|
| January | 0 | 0 | 22 | 3 |
| February | <1 | 0 | 19 | 2 |
| March | 2 | <1 | 12 | 3 |
| April | 8 | 2 | 2 | 3 |
| May | 16 | 6 | <1 | 3 |
| June | 26 | 14 | 0 | 3 |
| July | 30 | 21 | 0 | 3 |
| August | 29 | 17 | 0 | 3 |
| September | 19 | 7 | 0 | 3 |
| October | 7 | 1 | 2 | 2 |
| November | <1 | 0 | 10 | 3 |
| December | <1 | 0 | 20 | 3 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 2% | 22% | 7% | 22% | 4.7–10.6°C |
| February | 6% | 23% | 7% | 21% | 5.5–13.0°C |
| March | 20% | 24% | 8% | 24% | 11.4–17.6°C |
| April | 44% | 25% | 8% | 28% | 18.0–22.9°C |
| May | 61% | 31% | 10% | 39% | 22.7–26.6°C |
| June | 73% | 27% | 10% | 30% | 26.7–30.4°C |
| July | 71% | 30% | 11% | 34% | 28.9–32.8°C |
| August | 76% | 24% | 9% | 25% | 27.9–31.5°C |
| September | 75% | 22% | 8% | 22% | 24.5–28.4°C |
| October | 51% | 18% | 8% | 14% | 18.5–22.8°C |
| November | 18% | 21% | 9% | 17% | 12.4–17.2°C |
| December | 4% | 21% | 8% | 19% | 5.7–12.3°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