September
September · June · August
United States · 1991–2020
September leads for comfortable weather in Stanley Circle: typically 25.4°C by day, 11.4°C at night, with 35 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 88 — days reach only 2.9°C, 21° 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 | 2.9°C | -5.3°C | 51 mm | 7.5 | 9 h 32 | 5 | Good coverage |
| February | 5.7°C | -3.1°C | 50 mm | 7 | 10 h 34 | 5 | Good coverage |
| March | 11.4°C | 0.9°C | 56 mm | 6.7 | 11 h 49 | 27 | Good coverage |
| April | 15.2°C | 3.8°C | 85 mm | 9.2 | 13 h 14 | 38 | Good coverage |
| May | 21°C | 8.6°C | 68 mm | 7.7 | 14 h 26 | 70 | Good coverage |
| June | 26.8°C | 13.1°C | 38 mm | 4.3 | 15 h 05 | 86 | Good coverage |
| July | 32.4°C | 17.8°C | 20 mm | 2.7 | 14 h 50 | 67 | Good coverage |
| August | 31.3°C | 16.8°C | 19 mm | 3.1 | 13 h 48 | 73 | Good coverage |
| September | 25.4°C | 11.4°C | 35 mm | 4.5 | 12 h 25 | 88 | Good coverage |
| October | 17.5°C | 5.1°C | 58 mm | 6.5 | 11 h 02 | 55 | Good coverage |
| November | 9.4°C | -0.5°C | 52 mm | 6.6 | 9 h 50 | 18 | Good coverage |
| December | 3.5°C | -4.7°C | 50 mm | 7.2 | 9 h 15 | 5 | Good coverage |
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 15.0°C1 Jan 1997 | -19.4°C18 Jan 1984 | 38 mm9 Jan 2011 | 102 mm1993 · driest 11 mm in 2010 | 34 |
| February | 18.3°C26 Feb 1986 | -20.6°C1 Feb 1985 | 36 mm25 Feb 1998 | 113 mm1998 · driest 4 mm in 1988 | 34 |
| March | 24.4°C23 Mar 2004 | -13.9°C26 Mar 1913 | 55 mm9 Mar 1986 | 148 mm1983 · driest 18 mm in 2013 | 34 |
| April | 30.6°C24 Apr 2012 | -5.6°C2 Apr 1997 | 38 mm9 Apr 2013 | 160 mm2011 · driest 8 mm in 1981 | 34 |
| May | 36.1°C30 May 2003 | -1.7°C1 May 2011 | 50 mm12 May 1989 | 193 mm2011 · driest 5 mm in 2001 | 35 |
| June | 37.8°C29 Jun 2013 | 0.6°C4 Jun 1993 | 35 mm25 Jun 1985 | 128 mm1998 · driest 0 mm in 2013 | 35 |
| July | 40.0°C14 Jul 2002 | 8.3°C5 Jul 1986 | 32 mm24 Jul 1993 | 59 mm1982 · driest 0 mm in 2005 | 33 |
| August | 38.3°C5 Aug 1994 | 7.8°C27 Aug 1992 | 61 mm31 Aug 2000 | 70 mm2000 · driest 0 mm in 1996 | 34 |
| September | 35.0°C2 Sep 1995 | -1.1°C23 Sep 2007 | 53 mm27 Sep 1982 | 196 mm1982 · driest 2 mm in 1988 | 34 |
| October | 31.1°C1 Oct 2011 | -7.2°C30 Oct 1991 | 42 mm21 Oct 2004 | 153 mm2004 · driest 0 mm in 1999 | 34 |
| November | 24.4°C1 Nov 2012 | -15.0°C25 Nov 1993 | 41 mm23 Nov 2001 | 129 mm2001 · driest 9 mm in 2009 | 34 |
| December | 20.0°C1 Dec 1995 | -22.8°C23 Dec 1990 | 41 mm8 Dec 2007 | 175 mm1983 · driest 1 mm in 1986 | 35 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 28 | 2 | 6 |
| February | 0 | 0 | 23 | 2 | 4 |
| March | 0 | 0 | 14 | 2 | 2 |
| April | 2 | <1 | 6 | 3 | 1 |
| May | 9 | 2 | <1 | 2 | 0 |
| June | 20 | 11 | 0 | 1 | 0 |
| July | 30 | 25 | 0 | <1 | 0 |
| August | 30 | 23 | 0 | <1 | 0 |
| September | 19 | 6 | 0 | 1 | 0 |
| October | 4 | <1 | 4 | 2 | <1 |
| November | 0 | 0 | 17 | 2 | 3 |
| December | 0 | 0 | 26 | 2 | 5 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 0% | 23% | 5% | 23% | -1.1–5.9°C |
| February | 0% | 24% | 5% | 27% | 1.4–8.3°C |
| March | 6% | 23% | 8% | 24% | 9.1–13.4°C |
| April | 22% | 29% | 9% | 35% | 12.7–18.1°C |
| May | 51% | 25% | 8% | 29% | 17.7–23.2°C |
| June | 81% | 14% | 4% | 11% | 24.5–29.5°C |
| July | 89% | 10% | 2% | 6% | 29.5–34.3°C |
| August | 89% | 11% | 2% | 7% | 29.6–32.8°C |
| September | 73% | 16% | 4% | 15% | 23.2–27.2°C |
| October | 31% | 20% | 6% | 21% | 15.1–19.8°C |
| November | 2% | 23% | 5% | 26% | 6.2–12.0°C |
| December | <1% | 24% | 6% | 25% | 0.2–5.8°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