September
September · June · May
United States · 1991–2020
September leads for comfortable weather in Addison Park One: typically 26.9°C by day, 12.6°C at night, with 27 mm of rain. Based on measured 1991–2020 NOAA station history.
September · June · May
June · August · July
October · May · September
The weakest month is January, scoring 5 against September’s 85 — days reach only 3.6°C, 20° 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 | 3.6°C | -5.2°C | 36 mm | 7.2 | 9 h 33 | 5 | Strong coverage |
| February | 6.9°C | -2.8°C | 33 mm | 6.3 | 10 h 35 | 9 | Strong coverage |
| March | 12.8°C | 1.5°C | 44 mm | 7.4 | 11 h 49 | 34 | Strong coverage |
| April | 16.5°C | 4.5°C | 55 mm | 8.2 | 13 h 14 | 49 | Strong coverage |
| May | 22.4°C | 9.3°C | 46 mm | 6.6 | 14 h 25 | 80 | Strong coverage |
| June | 28.8°C | 14.1°C | 24 mm | 3.5 | 15 h 04 | 82 | Strong coverage |
| July | 34.3°C | 19.2°C | 13 mm | 2.4 | 14 h 49 | 59 | Strong coverage |
| August | 33°C | 18.3°C | 15 mm | 3.1 | 13 h 47 | 64 | Strong coverage |
| September | 26.9°C | 12.6°C | 27 mm | 3.9 | 12 h 25 | 85 | Strong coverage |
| October | 18.5°C | 5.5°C | 32 mm | 4.8 | 11 h 03 | 63 | Strong coverage |
| November | 10.3°C | -0.5°C | 34 mm | 5.4 | 9 h 51 | 25 | Strong coverage |
| December | 3.7°C | -4.7°C | 36 mm | 6.8 | 9 h 16 | 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 | 17.2°C31 Jan 2003 | -30.0°C25 Jan 1949 | 35 mm14 Jan 1953 | 82 mm1993 · driest 2 mm in 1961 | 79 |
| February | 20.6°C4 Feb 2025 | -25.6°C6 Feb 1989 | 31 mm24 Feb 1998 | 124 mm1998 · driest 3 mm in 1988 | 79 |
| March | 28.9°C21 Mar 2026 | -16.7°C4 Mar 1966 | 50 mm23 Mar 2017 | 101 mm1983 · driest 3 mm in 1956 | 79 |
| April | 31.7°C29 Apr 2007 | -9.4°C5 Apr 1955 | 41 mm25 Apr 1976 | 116 mm1974 · driest 7 mm in 2020 | 79 |
| May | 37.2°C28 May 2003 | -3.9°C6 May 1965 | 32 mm25 May 1973 | 131 mm2011 · driest 4 mm in 1972 | 79 |
| June | 41.7°C15 Jun 2021 | 1.7°C7 Jun 1962 | 45 mm21 Jun 1948 | 98 mm1998 · driest 0 mm in 1994 | 79 |
| July | 42.8°C12 Jul 2026 | 4.4°C1 Jul 1968 | 58 mm13 Jul 1962 | 65 mm1982 · driest 0 mm in 1963 | 79 |
| August | 41.1°C4 Aug 1994 | 2.8°C31 Aug 1965 | 41 mm4 Aug 1954 | 93 mm1968 · driest 1 mm in 1996 | 78 |
| September | 41.7°C7 Sep 2022 | -2.8°C18 Sep 1965 | 58 mm26 Sep 1982 | 179 mm1982 · driest 0 mm in 2018 | 78 |
| October | 33.3°C4 Oct 2024 | -9.9°C30 Oct 2019 | 63 mm4 Oct 2025 | 130 mm2025 · driest 0 mm in 1952 | 78 |
| November | 23.9°C12 Nov 1967 | -25.6°C16 Nov 1955 | 32 mm22 Nov 2001 | 85 mm2001 · driest 1 mm in 1976 | 78 |
| December | 20.6°C1 Dec 1995 | -26.1°C15 Dec 1972 | 31 mm28 Dec 1972 | 111 mm1983 · driest 1 mm in 2011 | 78 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 27 | <1 | 8 |
| February | 0 | 0 | 22 | <1 | 6 |
| March | <1 | 0 | 12 | 1 | 4 |
| April | 2 | <1 | 4 | 2 | 2 |
| May | 12 | 4 | <1 | 2 | <1 |
| June | 23 | 15 | 0 | <1 | 0 |
| July | 31 | 28 | 0 | <1 | 0 |
| August | 30 | 26 | 0 | <1 | 0 |
| September | 20 | 10 | 0 | <1 | 0 |
| October | 5 | <1 | 3 | <1 | <1 |
| November | 0 | 0 | 17 | <1 | 4 |
| December | 0 | 0 | 27 | <1 | 7 |
The best month has moved. On the 1961–1990 numbers the strongest month here was September (scoring 85); on 2011–2025 it is May (86). Both are scored the same way, from the same station — only the climate underneath changed.
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 0% | 22% | 2% | 22% | -0.5–6.2°C |
| February | <1% | 22% | 3% | 24% | 2.2–9.6°C |
| March | 8% | 25% | 4% | 28% | 9.2–14.7°C |
| April | 28% | 25% | 6% | 27% | 14.0–19.2°C |
| May | 62% | 21% | 5% | 20% | 19.4–24.8°C |
| June | 86% | 12% | 2% | 10% | 25.6–31.8°C |
| July | 92% | 8% | 1% | 5% | 31.8–36.2°C |
| August | 89% | 11% | 2% | 7% | 31.3–34.1°C |
| September | 81% | 13% | 3% | 10% | 23.9–29.0°C |
| October | 44% | 15% | 3% | 13% | 15.6–21.6°C |
| November | 4% | 19% | 3% | 20% | 7.3–13.6°C |
| December | 0% | 22% | 2% | 24% | 1.0–6.9°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