September
September · May · October
United States · 1991–2020
September leads for comfortable weather in Mill Seat: typically 28.1°C by day, 15.7°C at night, with 105 mm of rain. Based on measured 1991–2020 NOAA station history.
September · May · October
June · August · September
October · April · November
The weakest month is January, scoring 5 against September’s 73 — days reach only 8.5°C, 15° below the 24°C the score treats as ideal, and nights drop to -2.5°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 | 8.5°C | -2.5°C | 119 mm | 8.9 | 9 h 58 | 5 | Good coverage |
| February | 10.4°C | -1°C | 133 mm | 9.2 | 10 h 50 | 7 | Good coverage |
| March | 16.8°C | 3.5°C | 125 mm | 10.6 | 11 h 51 | 36 | Good coverage |
| April | 22.3°C | 8°C | 156 mm | 9.4 | 13 h 03 | 59 | Good coverage |
| May | 25.9°C | 13.5°C | 146 mm | 10.5 | 14 h 02 | 69 | Good coverage |
| June | 30°C | 18°C | 98 mm | 7.6 | 14 h 34 | 62 | Good coverage |
| July | 31.4°C | 19.9°C | 139 mm | 8.6 | 14 h 22 | 47 | Good coverage |
| August | 31.2°C | 19.2°C | 98 mm | 7.7 | 13 h 31 | 56 | Good coverage |
| September | 28.1°C | 15.7°C | 105 mm | 6 | 12 h 22 | 73 | Good coverage |
| October | 21.6°C | 9.1°C | 110 mm | 7.8 | 11 h 13 | 67 | Good coverage |
| November | 15.9°C | 3.5°C | 102 mm | 7.8 | 10 h 13 | 39 | Good coverage |
| December | 10.4°C | -0.2°C | 136 mm | 9.4 | 9 h 44 | 8 | Good coverage |
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 23.9°C2 Jan 2022 | -19.4°C21 Jan 2024 | 89 mm23 Jan 2016 | 175 mm2006 · driest 25 mm in 2026 | 25 |
| February | 27.2°C24 Feb 2023 | -16.1°C19 Feb 2015 | 114 mm16 Feb 2003 | 317 mm2019 · driest 49 mm in 2002 | 25 |
| March | 32.2°C23 Mar 2026 | -16.1°C7 Mar 2015 | 154 mm28 Mar 2021 | 346 mm2021 · driest 37 mm in 2026 | 25 |
| April | 32.2°C19 Apr 2006 | -6.7°C8 Apr 2007 | 91 mm22 Apr 2017 | 248 mm2014 · driest 56 mm in 2021 | 25 |
| May | 33.3°C15 May 2018 | 0.6°C9 May 2020 | 279 mm2 May 2010 | 490 mm2010 · driest 21 mm in 2005 | 25 |
| June | 41.7°C30 Jun 2012 | 8.3°C6 Jun 2009 | 75 mm7 Jun 2014 | 241 mm2014 · driest 0 mm in 2008 | 25 |
| July | 41.1°C2 Jul 2012 | 11.1°C5 Jul 2014 | 104 mm20 Jul 2012 | 256 mm2016 · driest 16 mm in 2011 | 25 |
| August | 41.1°C16 Aug 2007 | 8.3°C13 Aug 2004 | 112 mm30 Aug 2005 | 254 mm2021 · driest 12 mm in 2007 | 24 |
| September | 37.8°C3 Sep 2011 | 1.7°C26 Sep 2001 | 181 mm1 Sep 2017 | 238 mm2009 · driest 3 mm in 2019 | 25 |
| October | 36.1°C4 Oct 2019 | -3.3°C25 Oct 2013 | 92 mm14 Oct 2014 | 223 mm2014 · driest 4 mm in 2005 | 25 |
| November | 28.9°C2 Nov 2016 | -11.1°C13 Nov 2019 | 70 mm7 Nov 2017 | 187 mm2001 · driest 22 mm in 2009 | 25 |
| December | 25.0°C2 Dec 2012 | -16.7°C16 Dec 2010 | 95 mm10 Dec 2008 | 202 mm2013 · driest 54 mm in 2025 | 25 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 21 | 4 | 1 |
| February | <1 | 0 | 16 | 4 | 2 |
| March | 3 | <1 | 11 | 5 | <1 |
| April | 11 | 2 | 2 | 5 | 0 |
| May | 20 | 7 | 0 | 4 | 0 |
| June | 28 | 17 | 0 | 4 | 0 |
| July | 30 | 23 | 0 | 4 | 0 |
| August | 29 | 21 | 0 | 3 | 0 |
| September | 23 | 11 | 0 | 3 | 0 |
| October | 10 | 2 | 1 | 3 | 0 |
| November | 1 | 0 | 9 | 4 | 0 |
| December | <1 | 0 | 17 | 5 | <1 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 2% | 30% | 15% | 36% | 5.3–11.9°C |
| February | 7% | 32% | 16% | 42% | 6.4–14.1°C |
| March | 28% | 32% | 15% | 39% | 14.3–21.0°C |
| April | 51% | 31% | 15% | 41% | 20.2–24.4°C |
| May | 60% | 34% | 15% | 44% | 24.1–27.5°C |
| June | 74% | 26% | 12% | 33% | 28.6–31.2°C |
| July | 72% | 28% | 14% | 29% | 29.9–33.4°C |
| August | 76% | 24% | 12% | 26% | 29.4–32.7°C |
| September | 77% | 21% | 11% | 16% | 25.8–29.9°C |
| October | 52% | 24% | 10% | 24% | 19.9–23.2°C |
| November | 19% | 25% | 12% | 27% | 12.8–18.3°C |
| December | 4% | 30% | 15% | 38% | 7.7–14.6°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