September
September · June · August
United States · 1991–2020
September leads for comfortable weather in Walled Lake: typically 23.5°C by day, 11.3°C at night, with 83 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 81 — days reach only -0.6°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 | -0.6°C | -8.6°C | 58 mm | 9.5 | 9 h 23 | 5 | Good coverage |
| February | 0.4°C | -8.8°C | 48 mm | 8.1 | 10 h 29 | 5 | Good coverage |
| March | 6.7°C | -4.1°C | 60 mm | 7.7 | 11 h 48 | 5 | Good coverage |
| April | 13.9°C | 1.5°C | 74 mm | 9.6 | 13 h 19 | 31 | Good coverage |
| May | 20.7°C | 8.2°C | 106 mm | 10.6 | 14 h 35 | 60 | Good coverage |
| June | 26°C | 13.7°C | 78 mm | 8.9 | 15 h 17 | 80 | Good coverage |
| July | 28.5°C | 16.2°C | 85 mm | 8.6 | 15 h 00 | 71 | Good coverage |
| August | 27.5°C | 15.3°C | 81 mm | 7.6 | 13 h 54 | 77 | Good coverage |
| September | 23.5°C | 11.3°C | 83 mm | 7.7 | 12 h 26 | 81 | Good coverage |
| October | 15.9°C | 4.8°C | 65 mm | 9.6 | 10 h 59 | 45 | Good coverage |
| November | 8.6°C | -1.1°C | 66 mm | 8.1 | 9 h 42 | 11 | Good coverage |
| December | 2°C | -5.2°C | 57 mm | 8.7 | 9 h 04 | 5 | Good coverage |
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 17.2°C8 Jan 2008 | -26.7°C31 Jan 2019 | 34 mm12 Jan 2020 | 124 mm2024 · driest 14 mm in 2022 | 22 |
| February | 22.2°C28 Feb 2024 | -27.8°C20 Feb 2015 | 31 mm20 Feb 2018 | 93 mm2018 · driest 7 mm in 2024 | 22 |
| March | 29.4°C23 Mar 2012 | -22.8°C1 Mar 2014 | 40 mm1 Mar 2017 | 114 mm2017 · driest 16 mm in 2013 | 22 |
| April | 29.4°C25 Apr 2009 | -8.3°C7 Apr 2018 | 54 mm3 Apr 2025 | 142 mm2011 · driest 41 mm in 2008 | 22 |
| May | 34.4°C29 May 2018 | -2.8°C13 May 2013 | 74 mm31 May 2015 | 193 mm2018 · driest 24 mm in 2026 | 22 |
| June | 37.2°C29 Jun 2012 | 3.9°C5 Jun 2009 | 90 mm26 Jun 2021 | 206 mm2021 · driest 29 mm in 2012 | 22 |
| July | 37.8°C7 Jul 2012 | 8.9°C1 Jul 2024 | 81 mm17 Jul 2025 | 194 mm2021 · driest 32 mm in 2026 | 22 |
| August | 36.1°C2 Aug 2006 | 6.7°C30 Aug 2025 | 71 mm12 Aug 2014 | 168 mm2020 · driest 9 mm in 2010 | 21 |
| September | 36.7°C3 Sep 2011 | 1.7°C24 Sep 2012 | 89 mm22 Sep 2021 | 172 mm2021 · driest 19 mm in 2017 | 21 |
| October | 31.7°C5 Oct 2025 | -4.4°C31 Oct 2023 | 42 mm4 Oct 2021 | 193 mm2021 · driest 9 mm in 2005 | 21 |
| November | 25.0°C2 Nov 2016 | -15.0°C13 Nov 2019 | 58 mm16 Nov 2005 | 128 mm2005 · driest 16 mm in 2009 | 21 |
| December | 16.7°C4 Dec 2012 | -21.1°C28 Dec 2017 | 36 mm1 Dec 2006 | 104 mm2008 · driest 26 mm in 2010 | 22 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 29 | 2 | 8 |
| February | 0 | 0 | 26 | 1 | 8 |
| March | <1 | 0 | 25 | 2 | 3 |
| April | 1 | 0 | 12 | 3 | 1 |
| May | 8 | 2 | <1 | 4 | 0 |
| June | 19 | 6 | 0 | 3 | 0 |
| July | 27 | 11 | 0 | 3 | 0 |
| August | 25 | 8 | 0 | 3 | 0 |
| September | 12 | 3 | 0 | 3 | 0 |
| October | 2 | <1 | 5 | 2 | 0 |
| November | <1 | 0 | 19 | 2 | 2 |
| December | 0 | 0 | 28 | 2 | 6 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 0% | 31% | 5% | 38% | -3.3–2.2°C |
| February | <1% | 27% | 5% | 28% | -2.4–4.3°C |
| March | 4% | 26% | 6% | 32% | 4.3–10.7°C |
| April | 14% | 33% | 10% | 45% | 11.8–16.6°C |
| May | 42% | 33% | 11% | 40% | 18.5–23.7°C |
| June | 66% | 30% | 9% | 36% | 24.8–27.3°C |
| July | 71% | 29% | 10% | 34% | 27.0–30.4°C |
| August | 74% | 25% | 9% | 24% | 25.9–28.8°C |
| September | 60% | 24% | 9% | 29% | 22.1–25.5°C |
| October | 22% | 30% | 7% | 34% | 14.4–19.3°C |
| November | 4% | 26% | 7% | 32% | 4.9–11.7°C |
| December | 0% | 29% | 6% | 34% | -0.5–5.4°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