October
October · April · May
United States · 1991–2020
October leads for comfortable weather in Washington Park: typically 23.1°C by day, 12.5°C at night, with 96 mm of rain. Based on measured 1991–2020 NOAA station history.
October · April · May
June · August · July
April · October · November
The weakest month is January, scoring 20 against October’s 82 — days reach only 11.5°C, 12° below the 24°C the score treats as ideal, and nights drop to 0.9°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 | 11.5°C | 0.9°C | 98 mm | 7.5 | 10 h | 20 | Good coverage |
| February | 13.3°C | 1.9°C | 88 mm | 6.9 | 10 h 50 | 30 | Good coverage |
| March | 16.9°C | 5.2°C | 105 mm | 7.8 | 11 h 52 | 45 | Good coverage |
| April | 22.3°C | 10.4°C | 87 mm | 6.6 | 13 h 02 | 76 | Good coverage |
| May | 26.4°C | 15.7°C | 122 mm | 8.1 | 14 h 01 | 74 | Good coverage |
| June | 30.1°C | 20°C | 125 mm | 8.1 | 14 h 33 | 54 | Good coverage |
| July | 31.6°C | 22.1°C | 134 mm | 9.2 | 14 h 20 | 43 | Good coverage |
| August | 30.8°C | 21.7°C | 145 mm | 9.3 | 13 h 30 | 44 | Good coverage |
| September | 27.9°C | 18.8°C | 172 mm | 7.7 | 12 h 21 | 57 | Good coverage |
| October | 23.1°C | 12.5°C | 96 mm | 5.8 | 11 h 13 | 82 | Good coverage |
| November | 17.3°C | 6°C | 83 mm | 6.2 | 10 h 15 | 52 | Good coverage |
| December | 13.6°C | 3°C | 90 mm | 7.9 | 9 h 46 | 32 | Good coverage |
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 27.2°C11 Jan 1901 | -18.3°C7 Jan 2018 | 114 mm29 Jan 2014 | 214 mm2014 · driest 21 mm in 1907 | 30 |
| February | 28.9°C23 Feb 2023 | -15.6°C1 Feb 1900 | 110 mm27 Feb 1906 | 214 mm1906 · driest 20 mm in 2017 | 31 |
| March | 35.0°C23 Mar 1907 | -7.2°C6 Mar 1901 | 53 mm29 Mar 1903 | 166 mm2024 · driest 39 mm in 2025 | 31 |
| April | 32.8°C30 Apr 1903 | -1.7°C15 Apr 1907 | 83 mm5 Apr 2008 | 164 mm2015 · driest 13 mm in 1906 | 31 |
| May | 36.1°C20 May 1903 | 2.2°C11 May 1906 | 114 mm16 May 2014 | 331 mm2012 · driest 35 mm in 2011 | 30 |
| June | 38.3°C8 Jun 2008 | 8.3°C10 Jun 1905 | 141 mm3 Jun 2015 | 417 mm2021 · driest 4 mm in 2008 | 31 |
| July | 40.6°C7 Jul 1900 | 13.9°C10 Jul 2018 | 93 mm13 Jul 1903 | 453 mm2024 · driest 61 mm in 2011 | 31 |
| August | 41.7°C15 Aug 1900 | 10.6°C27 Aug 1905 | 290 mm27 Aug 2011 | 479 mm2011 · driest 80 mm in 2007 | 29 |
| September | 37.2°C20 Sep 1893 | 5.6°C30 Sep 1893 | 205 mm30 Sep 2010 | 465 mm2010 · driest 7 mm in 2025 | 27 |
| October | 33.9°C10 Oct 2007 | -2.2°C12 Oct 1906 | 203 mm8 Oct 2016 | 373 mm2005 · driest 11 mm in 2023 | 29 |
| November | 29.4°C20 Nov 1906 | -7.8°C27 Nov 1903 | 126 mm12 Nov 2020 | 226 mm2009 · driest 13 mm in 1905 | 29 |
| December | 30.0°C7 Dec 1906 | -10.6°C21 Dec 1901 | 53 mm17 Dec 2023 | 206 mm2009 · driest 24 mm in 2011 | 30 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) |
|---|---|---|---|---|
| January | <1 | 0 | 15 | 3 |
| February | <1 | 0 | 11 | 3 |
| March | 3 | <1 | 6 | 4 |
| April | 10 | 1 | <1 | 3 |
| May | 21 | 6 | 0 | 4 |
| June | 28 | 17 | 0 | 4 |
| July | 30 | 24 | 0 | 5 |
| August | 30 | 21 | 0 | 5 |
| September | 24 | 9 | 0 | 4 |
| October | 12 | 1 | <1 | 3 |
| November | 2 | 0 | 5 | 3 |
| December | <1 | 0 | 11 | 4 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 9% | 28% | 10% | 31% | 9.5–15.7°C |
| February | 14% | 28% | 13% | 31% | 10.1–17.4°C |
| March | 35% | 27% | 11% | 28% | 14.9–22.0°C |
| April | 54% | 23% | 10% | 22% | 19.9–24.8°C |
| May | 68% | 28% | 11% | 33% | 25.3–28.6°C |
| June | 71% | 28% | 13% | 32% | 28.6–32.4°C |
| July | 64% | 34% | 17% | 43% | 30.5–34.1°C |
| August | 67% | 31% | 14% | 37% | 29.3–32.8°C |
| September | 75% | 25% | 12% | 25% | 27.0–29.8°C |
| October | 66% | 19% | 7% | 17% | 22.1–24.9°C |
| November | 29% | 21% | 8% | 17% | 15.1–19.9°C |
| December | 11% | 25% | 10% | 27% | 11.6–16.5°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