October
October · April · September
United States · 1991–2020
October leads for comfortable weather in Mounds: typically 23.5°C by day, 9.8°C at night, with 101 mm of rain. Based on measured 1991–2020 NOAA station history.
October · April · September
September · August · June
November · October · April
The weakest month is January, scoring 20 against October’s 76 — days reach only 10.1°C, 14° below the 24°C the score treats as ideal, and nights drop to -2.8°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 | 10.1°C | -2.8°C | 42 mm | 4.3 | 9 h 58 | 20 | Good coverage |
| February | 12.3°C | -0.8°C | 46 mm | 5.1 | 10 h 49 | 30 | Good coverage |
| March | 17.7°C | 4.4°C | 84 mm | 7 | 11 h 51 | 50 | Good coverage |
| April | 22.8°C | 9.3°C | 115 mm | 7.2 | 13 h 03 | 71 | Good coverage |
| May | 27°C | 14.8°C | 159 mm | 9.9 | 14 h 02 | 66 | Good coverage |
| June | 31.9°C | 20°C | 120 mm | 7.4 | 14 h 35 | 49 | Good coverage |
| July | 34.6°C | 22.1°C | 94 mm | 5.6 | 14 h 22 | 42 | Good coverage |
| August | 34.4°C | 21.3°C | 91 mm | 5.8 | 13 h 31 | 44 | Good coverage |
| September | 30°C | 16.8°C | 90 mm | 5.7 | 12 h 22 | 67 | Good coverage |
| October | 23.5°C | 9.8°C | 101 mm | 6.7 | 11 h 13 | 76 | Good coverage |
| November | 17.4°C | 3.7°C | 58 mm | 4.9 | 10 h 13 | 53 | Good coverage |
| December | 10.9°C | -1.6°C | 60 mm | 4.7 | 9 h 44 | 22 | Good coverage |
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 26.1°C28 Jan 2015 | -18.2°C16 Jan 2024 | 49 mm10 Jan 2020 | 121 mm2020 · driest 3 mm in 2014 | 29 |
| February | 30.6°C11 Feb 2017 | -24.9°C10 Feb 2011 | 49 mm23 Feb 2001 | 121 mm2018 · driest 2 mm in 2026 | 29 |
| March | 35.6°C26 Mar 2020 | -18.3°C4 Mar 2002 | 78 mm19 Mar 2012 | 155 mm2012 · driest 20 mm in 2005 | 29 |
| April | 36.1°C17 Apr 2006 | -4.3°C8 Apr 2007 | 106 mm30 Apr 2019 | 282 mm2017 · driest 37 mm in 2001 | 29 |
| May | 36.7°C25 May 2006 | 1.1°C3 May 2011 | 161 mm6 May 2000 | 342 mm2015 · driest 37 mm in 2012 | 29 |
| June | 41.1°C25 Jun 2012 | 8.3°C7 Jun 1998 | 102 mm16 Jun 2008 | 286 mm2008 · driest 17 mm in 2020 | 29 |
| July | 44.4°C31 Jul 2012 | 12.8°C3 Jul 2013 | 111 mm2 Jul 2004 | 231 mm2020 · driest 1 mm in 2011 | 29 |
| August | 45.6°C1 Aug 2012 | 11.7°C20 Aug 2015 | 175 mm30 Aug 2003 | 329 mm2003 · driest 5 mm in 2000 | 28 |
| September | 42.2°C1 Sep 2000 | 3.3°C26 Sep 2000 | 120 mm21 Sep 2009 | 266 mm2009 · driest 25 mm in 2004 | 28 |
| October | 34.4°C9 Oct 2021 | -3.9°C9 Oct 2000 | 151 mm5 Oct 1998 | 257 mm1998 · driest 17 mm in 2012 | 28 |
| November | 31.7°C2 Nov 2012 | -10.5°C18 Nov 2014 | 80 mm2 Nov 2024 | 274 mm2024 · driest 2 mm in 2005 | 28 |
| December | 30.6°C27 Dec 2025 | -18.3°C9 Dec 2005 | 84 mm26 Dec 2015 | 225 mm2015 · driest 1 mm in 2025 | 28 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) |
|---|---|---|---|---|
| January | <1 | 0 | 24 | 2 |
| February | <1 | <1 | 17 | 2 |
| March | 5 | <1 | 8 | 3 |
| April | 12 | 3 | 1 | 3 |
| May | 22 | 10 | 0 | 5 |
| June | 29 | 22 | 0 | 4 |
| July | 30 | 28 | 0 | 3 |
| August | 30 | 27 | 0 | 3 |
| September | 26 | 16 | 0 | 3 |
| October | 14 | 4 | 1 | 3 |
| November | 3 | <1 | 9 | 2 |
| December | <1 | 0 | 21 | 2 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 9% | 14% | 5% | 9% | 7.5–12.2°C |
| February | 20% | 17% | 5% | 12% | 9.1–16.9°C |
| March | 37% | 22% | 9% | 25% | 15.1–21.6°C |
| April | 58% | 25% | 12% | 25% | 20.8–24.8°C |
| May | 66% | 31% | 16% | 39% | 24.9–28.4°C |
| June | 74% | 26% | 13% | 27% | 29.4–33.8°C |
| July | 82% | 18% | 9% | 15% | 32.9–36.7°C |
| August | 82% | 18% | 9% | 17% | 32.2–36.4°C |
| September | 82% | 17% | 9% | 16% | 27.9–32.4°C |
| October | 64% | 21% | 9% | 22% | 21.7–25.8°C |
| November | 35% | 16% | 7% | 12% | 15.0–19.8°C |
| December | 9% | 15% | 6% | 10% | 9.1–13.8°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