September
September · August · July
United States · 1991–2020
September leads for comfortable weather in Dean: typically 23.6°C by day, 12.5°C at night, with 1 mm of rain. Based on measured 1991–2020 NOAA station history.
September · August · July
September · August · July
May · April · June
The weakest month is January, scoring 51 against September’s 94 — days reach only 16.8°C, 7° below the 24°C the score treats as ideal, and nights drop to 5.6°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 | Sea | Daylight | Comfort | Coverage |
|---|---|---|---|---|---|---|---|---|
| January | 16.8°C | 5.6°C | 67 mm | 7.3 | 12.7°C | 9 h 55 | 51 | Strong coverage |
| February | 17.4°C | 6.3°C | 62 mm | 7.5 | 12.6°C | 10 h 48 | 55 | Strong coverage |
| March | 18.6°C | 7.2°C | 52 mm | 6.9 | 12.5°C | 11 h 51 | 62 | Strong coverage |
| April | 19.5°C | 8.2°C | 24 mm | 3.9 | 12.1°C | 13 h 04 | 72 | Strong coverage |
| May | 20.2°C | 10.4°C | 10 mm | 1.9 | 12.1°C | 14 h 05 | 79 | Strong coverage |
| June | 21.3°C | 11.8°C | 2 mm | 0.5 | 12.6°C | 14 h 38 | 85 | Strong coverage |
| July | 21.6°C | 13°C | 0 mm | 0.1 | 13.7°C | 14 h 25 | 88 | Strong coverage |
| August | 22.5°C | 13.3°C | 1 mm | 0.2 | 14.4°C | 13 h 33 | 92 | Strong coverage |
| September | 23.6°C | 12.5°C | 1 mm | 0.4 | 14.7°C | 12 h 22 | 94 | Strong coverage |
| October | 23.2°C | 10°C | 15 mm | 1.8 | 14.4°C | 11 h 11 | 88 | Strong coverage |
| November | 19.8°C | 7.2°C | 32 mm | 4.3 | 13.8°C | 10 h 10 | 71 | Strong coverage |
| December | 16.4°C | 5°C | 54 mm | 6.7 | 13.0°C | 9 h 41 | 51 | 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 | 30.0°C17 Jan 2014 | -7.8°C21 Jan 1937 | 68 mm23 Jan 2000 | 201 mm1969 · driest 0 mm in 2022 | 94 |
| February | 31.1°C12 Feb 2022 | -3.9°C13 Feb 1949 | 54 mm16 Feb 2026 | 253 mm1998 · driest 0 mm in 2020 | 93 |
| March | 34.4°C20 Mar 2026 | -2.8°C15 Mar 1944 | 48 mm10 Mar 1995 | 152 mm1991 · driest 0 mm in 1962 | 94 |
| April | 37.8°C26 Apr 2004 | -1.7°C9 Apr 1933 | 55 mm1 Apr 1974 | 144 mm1967 · driest 0 mm in 1949 | 94 |
| May | 37.2°C12 May 1976 | 1.1°C1 May 1967 | 43 mm24 May 1931 | 59 mm1957 · driest 0 mm in 1974 | 94 |
| June | 40.6°C10 Jun 2019 | 3.9°C7 Jun 1932 | 15 mm5 Jun 1934 | 18 mm1934 · driest 0 mm in 2019 | 93 |
| July | 35.6°C14 Jul 1935 | 5.6°C18 Jul 1936 | 13 mm2 Jul 1980 | 14 mm1980 · driest 0 mm in 2019 | 94 |
| August | 36.7°C29 Aug 1968 | 5.6°C22 Aug 1931 | 22 mm26 Aug 1935 | 22 mm1935 · driest 0 mm in 2008 | 93 |
| September | 42.8°C2 Sep 2017 | 2.2°C30 Sep 1950 | 20 mm30 Sep 1983 | 31 mm1976 · driest 0 mm in 1974 | 93 |
| October | 40.6°C5 Oct 1987 | -2.2°C31 Oct 1935 | 42 mm13 Oct 2009 | 71 mm2004 · driest 0 mm in 1995 | 93 |
| November | 35.6°C5 Nov 2012 | -3.9°C22 Nov 1931 | 56 mm30 Nov 2012 | 121 mm1982 · driest 0 mm in 1980 | 93 |
| December | 29.4°C1 Dec 2021 | -5.0°C27 Dec 1954 | 82 mm11 Dec 2014 | 228 mm1955 · driest 0 mm in 2011 | 93 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) |
|---|---|---|---|---|
| January | <1 | 0 | 2 | 3 |
| February | 2 | 0 | <1 | 2 |
| March | 3 | <1 | <1 | 2 |
| April | 3 | <1 | 0 | <1 |
| May | 3 | <1 | 0 | <1 |
| June | 4 | <1 | 0 | 0 |
| July | 3 | <1 | 0 | 0 |
| August | 5 | <1 | 0 | 0 |
| September | 9 | 3 | 0 | 0 |
| October | 10 | 4 | 0 | <1 |
| November | 4 | <1 | <1 | <1 |
| December | <1 | 0 | 2 | 2 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 18% | 23% | 8% | 30% | 14.2–18.9°C |
| February | 22% | 25% | 8% | 32% | 15.1–19.3°C |
| March | 29% | 21% | 6% | 23% | 15.9–19.9°C |
| April | 36% | 13% | 3% | 11% | 17.4–21.0°C |
| May | 44% | 5% | <1% | 3% | 18.5–22.3°C |
| June | 64% | 2% | <1% | 0% | 19.8–23.3°C |
| July | 78% | <1% | 0% | 0% | 20.3–23.2°C |
| August | 86% | <1% | 0% | <1% | 20.9–23.7°C |
| September | 87% | 2% | <1% | <1% | 22.1–26.0°C |
| October | 72% | 6% | 2% | 3% | 21.4–25.1°C |
| November | 45% | 15% | 4% | 17% | 17.6–22.2°C |
| December | 18% | 22% | 7% | 25% | 14.6–18.7°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