September
September · June · August
United States · 1991–2020
September leads for comfortable weather in Bates: typically 23.2°C by day, 9.2°C at night, with 94 mm of rain. Based on measured 1991–2020 NOAA station history.
September · June · August
July · August · June
May · September · June
The weakest month is January, scoring 5 against September’s 73 — days reach only 0.9°C, 23° below the 24°C the score treats as ideal, and nights drop to -11.3°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 | 0.9°C | -11.3°C | 61 mm | 8.9 | 9 h 23 | 5 | Strong coverage |
| February | 2.1°C | -10.4°C | 54 mm | 7.9 | 10 h 29 | 5 | Strong coverage |
| March | 6.3°C | -6.3°C | 72 mm | 8.7 | 11 h 48 | 5 | Strong coverage |
| April | 13.8°C | -0.1°C | 82 mm | 9.9 | 13 h 18 | 26 | Strong coverage |
| May | 20.7°C | 6.2°C | 90 mm | 11.1 | 14 h 35 | 58 | Strong coverage |
| June | 25.1°C | 11.1°C | 111 mm | 11 | 15 h 16 | 72 | Strong coverage |
| July | 27.6°C | 13.6°C | 116 mm | 10.3 | 15 h | 68 | Strong coverage |
| August | 26.8°C | 12.9°C | 97 mm | 9.5 | 13 h 54 | 72 | Strong coverage |
| September | 23.2°C | 9.2°C | 94 mm | 9 | 12 h 26 | 73 | Strong coverage |
| October | 16.3°C | 2.9°C | 108 mm | 9.9 | 10 h 59 | 36 | Strong coverage |
| November | 9.7°C | -2.1°C | 67 mm | 7.9 | 9 h 42 | 13 | Strong coverage |
| December | 3.8°C | -7.3°C | 70 mm | 9.3 | 9 h 05 | 5 | Strong coverage |
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 20.0°C9 Jan 2008 | -32.2°C27 Jan 1994 | 37 mm24 Jan 2019 | 110 mm1999 · driest 19 mm in 2025 | 39 |
| February | 23.9°C22 Feb 2018 | -29.4°C24 Feb 2015 | 42 mm14 Feb 2014 | 147 mm2008 · driest 2 mm in 1987 | 40 |
| March | 29.4°C31 Mar 1986 | -23.9°C6 Mar 2014 | 64 mm15 Mar 1986 | 164 mm2010 · driest 23 mm in 2012 | 39 |
| April | 33.9°C28 Apr 2009 | -15.0°C5 Apr 2016 | 86 mm16 Apr 2007 | 160 mm2007 · driest 23 mm in 2009 | 40 |
| May | 34.4°C27 May 2010 | -6.7°C1 May 2014 | 51 mm11 May 2007 | 153 mm2025 · driest 23 mm in 1993 | 39 |
| June | 36.1°C24 Jun 2025 | -0.6°C1 Jun 2009 | 78 mm7 Jun 2000 | 253 mm2006 · driest 25 mm in 1988 | 40 |
| July | 36.1°C17 Jul 1988 | 3.9°C3 Jul 2015 | 84 mm4 Jul 1999 | 262 mm1995 · driest 37 mm in 2022 | 39 |
| August | 36.7°C10 Aug 2001 | 2.8°C30 Aug 1986 | 89 mm28 Aug 2011 | 277 mm2011 · driest 26 mm in 1998 | 39 |
| September | 35.0°C12 Sep 2013 | -3.9°C10 Sep 2013 | 126 mm17 Sep 1999 | 219 mm1999 · driest 26 mm in 2019 | 38 |
| October | 30.6°C6 Oct 2025 | -8.3°C31 Oct 2002 | 115 mm1 Oct 2010 | 458 mm2005 · driest 18 mm in 1994 | 39 |
| November | 26.7°C1 Nov 2024 | -17.8°C30 Nov 2013 | 66 mm11 Nov 1990 | 130 mm2018 · driest 18 mm in 1998 | 40 |
| December | 22.2°C8 Dec 1998 | -24.4°C12 Dec 1988 | 46 mm26 Dec 2002 | 120 mm1996 · driest 11 mm in 1989 | 39 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 26 | 2 | 6 |
| February | 0 | 0 | 26 | 2 | 5 |
| March | <1 | 0 | 26 | 2 | 4 |
| April | 2 | <1 | 16 | 3 | <1 |
| May | 8 | 2 | 4 | 3 | 0 |
| June | 17 | 5 | <1 | 4 | 0 |
| July | 25 | 9 | 0 | 4 | 0 |
| August | 23 | 6 | 0 | 3 | 0 |
| September | 12 | 2 | <1 | 3 | 0 |
| October | 2 | 0 | 9 | 4 | <1 |
| November | 0 | 0 | 19 | 2 | 2 |
| December | 0 | 0 | 24 | 2 | 4 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | <1% | 28% | 7% | 33% | -2.1–4.2°C |
| February | <1% | 28% | 7% | 32% | -1.3–5.4°C |
| March | 4% | 28% | 7% | 32% | 3.5–10.0°C |
| April | 12% | 34% | 10% | 45% | 11.7–16.4°C |
| May | 39% | 36% | 10% | 48% | 18.1–23.0°C |
| June | 58% | 37% | 12% | 47% | 23.8–26.7°C |
| July | 66% | 34% | 12% | 42% | 25.9–29.4°C |
| August | 67% | 32% | 12% | 37% | 25.0–29.0°C |
| September | 55% | 29% | 10% | 37% | 21.1–24.7°C |
| October | 22% | 32% | 11% | 40% | 14.5–18.4°C |
| November | 5% | 28% | 8% | 31% | 6.6–12.8°C |
| December | <1% | 29% | 7% | 30% | 0.4–7.0°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