September
September · May · June
United States · 1991–2020
September leads for comfortable weather in Bells Mill: typically 25.5°C by day, 14.7°C at night, with 117 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 79 — days reach only 6.9°C, 17° 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 | 6.9°C | -2.8°C | 138 mm | 10.1 | 10 h 01 | 5 | Strong coverage |
| February | 9.5°C | -1°C | 144 mm | 9.7 | 10 h 51 | 5 | Strong coverage |
| March | 14.2°C | 2.9°C | 163 mm | 11.2 | 11 h 52 | 21 | Strong coverage |
| April | 19.4°C | 7.6°C | 159 mm | 9.9 | 13 h 02 | 48 | Strong coverage |
| May | 23.2°C | 12.3°C | 135 mm | 9.6 | 14 h | 73 | Strong coverage |
| June | 26.9°C | 16.5°C | 146 mm | 10.8 | 14 h 31 | 65 | Strong coverage |
| July | 28.4°C | 18.5°C | 165 mm | 11.4 | 14 h 19 | 53 | Strong coverage |
| August | 28.1°C | 17.8°C | 121 mm | 9 | 13 h 29 | 64 | Strong coverage |
| September | 25.5°C | 14.7°C | 117 mm | 7 | 12 h 21 | 79 | Strong coverage |
| October | 19.9°C | 8.4°C | 106 mm | 7.3 | 11 h 14 | 61 | Strong coverage |
| November | 13.7°C | 2.8°C | 132 mm | 8.6 | 10 h 16 | 25 | Strong coverage |
| December | 8.9°C | -0.8°C | 178 mm | 10.8 | 9 h 47 | 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 | 22.8°C1 Jan 1952 | -28.9°C21 Jan 1985 | 106 mm7 Jan 1946 | 359 mm1950 · driest 41 mm in 1985 | 85 |
| February | 26.7°C23 Feb 2023 | -22.2°C17 Feb 1958 | 113 mm6 Feb 2020 | 348 mm2020 · driest 5 mm in 1996 | 86 |
| March | 27.8°C13 Mar 1967 | -17.2°C13 Mar 1993 | 152 mm16 Mar 1973 | 352 mm1973 · driest 42 mm in 2007 | 85 |
| April | 31.1°C30 Apr 1942 | -7.2°C13 Apr 1940 | 124 mm28 Apr 2011 | 343 mm2013 · driest 29 mm in 2012 | 86 |
| May | 35.0°C28 May 1941 | -1.1°C1 May 1963 | 109 mm17 May 1969 | 309 mm2003 · driest 22 mm in 1951 | 88 |
| June | 37.8°C30 Jun 2012 | 4.4°C1 Jun 1972 | 189 mm5 Jun 1998 | 302 mm1998 · driest 18 mm in 1944 | 86 |
| July | 38.3°C28 Jul 1952 | 8.9°C22 Jul 1947 | 119 mm12 Jul 1949 | 361 mm2003 · driest 6 mm in 1944 | 88 |
| August | 37.2°C17 Aug 2007 | 6.7°C13 Aug 2004 | 103 mm17 Aug 1985 | 253 mm1985 · driest 2 mm in 1999 | 86 |
| September | 36.7°C6 Sep 1954 | 0.6°C28 Sep 1942 | 150 mm18 Sep 2012 | 260 mm2012 · driest 2 mm in 2019 | 87 |
| October | 32.8°C4 Oct 2019 | -5.6°C28 Oct 1957 | 104 mm8 Oct 1975 | 269 mm1975 · driest 0 mm in 1963 | 87 |
| November | 27.2°C2 Nov 2016 | -21.7°C25 Nov 1950 | 104 mm28 Nov 1948 | 336 mm1948 · driest 27 mm in 2021 | 88 |
| December | 22.8°C8 Dec 1956 | -22.8°C25 Dec 1983 | 195 mm23 Dec 1990 | 465 mm1990 · driest 31 mm in 1958 | 87 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 20 | 5 | 1 |
| February | 0 | 0 | 16 | 4 | 1 |
| March | <1 | 0 | 11 | 5 | <1 |
| April | 5 | 0 | 2 | 5 | 0 |
| May | 14 | <1 | <1 | 4 | 0 |
| June | 24 | 5 | 0 | 5 | 0 |
| July | 28 | 9 | 0 | 5 | 0 |
| August | 27 | 8 | 0 | 4 | 0 |
| September | 19 | 3 | 0 | 3 | 0 |
| October | 4 | <1 | 2 | 3 | 0 |
| November | <1 | 0 | 10 | 4 | <1 |
| December | 0 | 0 | 18 | 6 | <1 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | <1% | 33% | 16% | 42% | 3.9–10.6°C |
| February | 2% | 36% | 18% | 47% | 6.6–13.1°C |
| March | 15% | 35% | 18% | 45% | 11.2–17.7°C |
| April | 41% | 30% | 15% | 37% | 17.5–22.3°C |
| May | 59% | 31% | 14% | 39% | 21.9–25.8°C |
| June | 69% | 31% | 13% | 37% | 25.8–29.0°C |
| July | 66% | 34% | 15% | 42% | 27.2–30.2°C |
| August | 73% | 27% | 12% | 32% | 26.8–30.6°C |
| September | 72% | 24% | 11% | 25% | 23.9–28.1°C |
| October | 50% | 22% | 10% | 24% | 18.5–22.6°C |
| November | 13% | 27% | 13% | 32% | 11.2–16.7°C |
| December | 1% | 31% | 16% | 40% | 5.8–11.8°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