September
September · June · August
United States · 1991–2020
September leads for comfortable weather in Wolverine Lake: typically 23.1°C by day, 12°C at night, with 76 mm of rain. Based on measured 1991–2020 NOAA station history.
September · June · August
July · August · June
May · September · October
The weakest month is January, scoring 5 against September’s 82 — days reach only -0.8°C, 25° 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 | -0.8°C | -8.5°C | 39 mm | 6.6 | 9 h 23 | 5 | Good coverage |
| February | 0.7°C | -7.9°C | 31 mm | 5.2 | 10 h 29 | 5 | Good coverage |
| March | 6.6°C | -3.3°C | 46 mm | 7.2 | 11 h 48 | 5 | Good coverage |
| April | 14.1°C | 2.7°C | 69 mm | 8.6 | 13 h 19 | 35 | Good coverage |
| May | 20.6°C | 8.9°C | 100 mm | 10.3 | 14 h 35 | 62 | Good coverage |
| June | 25.8°C | 14.4°C | 80 mm | 9 | 15 h 17 | 81 | Good coverage |
| July | 28.2°C | 17°C | 74 mm | 8 | 15 h 01 | 73 | Good coverage |
| August | 26.9°C | 16.3°C | 65 mm | 7 | 13 h 54 | 80 | Good coverage |
| September | 23.1°C | 12°C | 76 mm | 7.7 | 12 h 26 | 82 | Good coverage |
| October | 15.6°C | 5.7°C | 66 mm | 8.5 | 10 h 59 | 46 | Good coverage |
| November | 8.6°C | 0.3°C | 50 mm | 7 | 9 h 42 | 17 | Good coverage |
| December | 1.8°C | -4.9°C | 42 mm | 6.2 | 9 h 04 | 5 | Good coverage |
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 16.1°C7 Jan 2008 | -26.6°C6 Jan 2014 | 57 mm11 Jan 2020 | 85 mm2006 · driest 4 mm in 2022 | 28 |
| February | 22.2°C27 Feb 2024 | -28.2°C20 Feb 2015 | 41 mm20 Feb 2018 | 78 mm2001 · driest 5 mm in 2015 | 28 |
| March | 28.9°C22 Mar 2012 | -22.2°C3 Mar 2003 | 37 mm7 Mar 2009 | 89 mm2009 · driest 8 mm in 1999 | 28 |
| April | 29.4°C18 Apr 2004 | -8.2°C5 Apr 2016 | 47 mm4 Apr 2003 | 150 mm2013 · driest 6 mm in 2004 | 28 |
| May | 33.9°C28 May 2018 | -2.1°C13 May 2020 | 39 mm25 May 2011 | 184 mm2004 · driest 19 mm in 2023 | 28 |
| June | 37.2°C28 Jun 2012 | 4.4°C1 Jun 2003 | 52 mm19 Jun 2009 | 138 mm2013 · driest 26 mm in 2012 | 28 |
| July | 37.8°C4 Jul 2012 | 6.7°C6 Jul 2001 | 61 mm28 Jul 2011 | 132 mm2011 · driest 16 mm in 2001 | 28 |
| August | 36.7°C8 Aug 2001 | 7.2°C30 Aug 2025 | 89 mm24 Aug 2023 | 187 mm2023 · driest 5 mm in 1998 | 28 |
| September | 35.0°C2 Sep 2011 | 1.7°C19 Sep 2020 | 78 mm13 Sep 2008 | 209 mm2008 · driest 8 mm in 2017 | 28 |
| October | 31.3°C4 Oct 2025 | -4.3°C30 Oct 2008 | 51 mm16 Oct 2001 | 182 mm2001 · driest 0 mm in 2025 | 28 |
| November | 24.4°C1 Nov 2016 | -13.8°C13 Nov 2019 | 32 mm18 Nov 2017 | 97 mm2005 · driest 14 mm in 2022 | 28 |
| December | 18.9°C5 Dec 2001 | -23.2°C28 Dec 2017 | 33 mm28 Dec 2025 | 87 mm2006 · driest 10 mm in 2017 | 28 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 28 | 1 | 5 |
| February | 0 | 0 | 26 | <1 | 4 |
| March | <1 | 0 | 24 | 2 | 2 |
| April | 2 | 0 | 10 | 2 | <1 |
| May | 8 | 2 | <1 | 4 | 0 |
| June | 18 | 6 | 0 | 3 | 0 |
| July | 26 | 11 | 0 | 2 | 0 |
| August | 23 | 6 | 0 | 2 | 0 |
| September | 11 | 3 | 0 | 3 | 0 |
| October | 2 | <1 | 4 | 2 | 0 |
| November | 0 | 0 | 16 | 2 | 1 |
| December | 0 | 0 | 27 | 1 | 4 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 0% | 21% | 3% | 19% | -3.9–2.3°C |
| February | <1% | 18% | 2% | 13% | -2.9–3.7°C |
| March | 4% | 24% | 5% | 25% | 3.7–11.1°C |
| April | 15% | 30% | 7% | 35% | 12.0–16.3°C |
| May | 39% | 32% | 11% | 41% | 18.3–22.9°C |
| June | 65% | 31% | 10% | 34% | 24.2–27.6°C |
| July | 73% | 26% | 7% | 30% | 25.7–30.3°C |
| August | 75% | 24% | 7% | 21% | 25.3–28.5°C |
| September | 60% | 25% | 8% | 27% | 21.1–25.3°C |
| October | 21% | 28% | 7% | 31% | 14.1–18.0°C |
| November | 3% | 23% | 5% | 22% | 5.7–11.9°C |
| December | 0% | 21% | 4% | 19% | -1.1–5.5°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