September
September · May · October
United States · 1991–2020
September leads for comfortable weather in Bloom: typically 28.4°C by day, 13.4°C at night, with 34 mm of rain. Based on measured 1991–2020 NOAA station history.
September · May · October
September · August · July
April · October · May
The weakest month is January, scoring 6 against September’s 82 — days reach only 7.2°C, 17° below the 24°C the score treats as ideal, and nights drop to -6.5°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 | 7.2°C | -6.5°C | 15 mm | 2.3 | 9 h 50 | 6 | Strong coverage |
| February | 9.3°C | -5°C | 16 mm | 2.8 | 10 h 45 | 16 | Strong coverage |
| March | 15°C | -0.4°C | 34 mm | 3.7 | 11 h 50 | 42 | Strong coverage |
| April | 19.9°C | 4.5°C | 50 mm | 5.5 | 13 h 06 | 63 | Strong coverage |
| May | 25.4°C | 10.7°C | 76 mm | 6.3 | 14 h 10 | 79 | Strong coverage |
| June | 31.2°C | 16.5°C | 83 mm | 6.8 | 14 h 44 | 63 | Strong coverage |
| July | 33.9°C | 19.2°C | 78 mm | 6.8 | 14 h 31 | 50 | Strong coverage |
| August | 32.7°C | 18.2°C | 76 mm | 6.8 | 13 h 36 | 57 | Strong coverage |
| September | 28.4°C | 13.4°C | 34 mm | 3.7 | 12 h 23 | 82 | Strong coverage |
| October | 21.2°C | 6.1°C | 51 mm | 4.3 | 11 h 10 | 71 | Strong coverage |
| November | 13.6°C | -1°C | 20 mm | 2.7 | 10 h 06 | 37 | Strong coverage |
| December | 7.4°C | -5.5°C | 25 mm | 2.8 | 9 h 35 | 8 | 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 | 26.7°C27 Jan 2015 | -25.0°C19 Jan 1984 | 36 mm15 Jan 2017 | 65 mm2017 · driest 0 mm in 1961 | 79 |
| February | 31.1°C18 Feb 2016 | -26.1°C1 Feb 1951 | 46 mm10 Feb 1993 | 73 mm1993 · driest 0 mm in 1991 | 79 |
| March | 35.0°C21 Mar 2026 | -26.1°C11 Mar 1948 | 65 mm10 Mar 1973 | 225 mm1973 · driest 0 mm in 2026 | 79 |
| April | 37.8°C22 Apr 1989 | -10.0°C12 Apr 1997 | 118 mm30 Apr 1978 | 205 mm2016 · driest 1 mm in 2024 | 79 |
| May | 41.1°C29 May 2011 | -3.8°C3 May 2013 | 88 mm29 May 2001 | 262 mm2015 · driest 6 mm in 2004 | 79 |
| June | 43.9°C27 Jun 2012 | 5.0°C2 Jun 2013 | 112 mm30 Jun 2024 | 305 mm2024 · driest 3 mm in 1952 | 79 |
| July | 42.8°C16 Jul 2022 | 7.8°C13 Jul 1990 | 120 mm4 Jul 2010 | 232 mm1962 · driest 6 mm in 1978 | 79 |
| August | 42.2°C4 Aug 2008 | 8.3°C20 Aug 1950 | 98 mm29 Aug 2003 | 189 mm1977 · driest 8 mm in 2022 | 78 |
| September | 41.7°C1 Sep 2011 | -1.7°C30 Sep 1985 | 64 mm24 Sep 1959 | 173 mm1973 · driest 0 mm in 1998 | 78 |
| October | 38.3°C17 Oct 2016 | -12.1°C31 Oct 2019 | 105 mm9 Oct 1949 | 164 mm2018 · driest 0 mm in 1952 | 78 |
| November | 32.8°C8 Nov 1980 | -17.8°C28 Nov 1958 | 87 mm8 Nov 2024 | 162 mm2024 · driest 0 mm in 1966 | 78 |
| December | 30.0°C24 Dec 1955 | -29.4°C22 Dec 1989 | 62 mm29 Dec 2006 | 108 mm2006 · driest 0 mm in 1996 | 78 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | <1 | 0 | 29 | <1 | 3 |
| February | <1 | <1 | 24 | <1 | 3 |
| March | 3 | <1 | 17 | 1 | 2 |
| April | 8 | 2 | 6 | 2 | <1 |
| May | 18 | 7 | <1 | 3 | 0 |
| June | 27 | 19 | 0 | 3 | 0 |
| July | 30 | 26 | 0 | 3 | 0 |
| August | 29 | 23 | 0 | 2 | 0 |
| September | 23 | 14 | <1 | 1 | 0 |
| October | 10 | 4 | 4 | 2 | <1 |
| November | 2 | <1 | 18 | <1 | 1 |
| December | 0 | 0 | 28 | <1 | 3 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 3% | 8% | 1% | 3% | 2.1–9.9°C |
| February | 10% | 11% | 1% | 6% | 4.1–13.7°C |
| March | 27% | 14% | 3% | 10% | 10.0–17.9°C |
| April | 48% | 17% | 5% | 14% | 16.8–22.5°C |
| May | 66% | 24% | 8% | 25% | 22.2–27.6°C |
| June | 76% | 23% | 9% | 23% | 28.1–33.8°C |
| July | 78% | 21% | 8% | 19% | 31.5–36.4°C |
| August | 79% | 20% | 7% | 18% | 30.0–35.2°C |
| September | 80% | 14% | 5% | 10% | 25.2–31.0°C |
| October | 58% | 12% | 4% | 8% | 18.5–24.0°C |
| November | 21% | 10% | 2% | 5% | 9.8–16.5°C |
| December | 4% | 9% | 2% | 5% | 4.3–10.6°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