September
September · August · July
United States · 1991–2020
September leads for comfortable weather in Skyline: typically 22.8°C by day, 9.8°C at night, with 82 mm of rain. Based on measured 1991–2020 NOAA station history.
September · August · July
July · August · June
September · May · October
The weakest month is January, scoring 5 against September’s 77 — days reach only -4.7°C, 29° 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 | -4.7°C | -14.9°C | 26 mm | 4.8 | 9 h 13 | 5 | Good coverage |
| February | -1.4°C | -11.9°C | 20 mm | 4 | 10 h 23 | 5 | Good coverage |
| March | 5.1°C | -5.8°C | 46 mm | 6.1 | 11 h 47 | 5 | Good coverage |
| April | 14.1°C | 1.4°C | 79 mm | 8.6 | 13 h 23 | 32 | Good coverage |
| May | 20.7°C | 8.1°C | 95 mm | 9.7 | 14 h 44 | 62 | Good coverage |
| June | 25.9°C | 13.9°C | 143 mm | 10.3 | 15 h 29 | 70 | Good coverage |
| July | 27.6°C | 16.2°C | 108 mm | 8.4 | 15 h 11 | 71 | Good coverage |
| August | 26.7°C | 15.1°C | 115 mm | 7.8 | 14 h 01 | 75 | Good coverage |
| September | 22.8°C | 9.8°C | 82 mm | 6.7 | 12 h 27 | 77 | Good coverage |
| October | 15.6°C | 3.1°C | 63 mm | 6.5 | 10 h 55 | 44 | Good coverage |
| November | 6.1°C | -3.9°C | 47 mm | 5.2 | 9 h 33 | 5 | Good coverage |
| December | -1.5°C | -10.8°C | 25 mm | 5.3 | 8 h 53 | 5 | Good coverage |
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 14.4°C27 Jan 2002 | -34.4°C31 Jan 1994 | 38 mm18 Jan 1996 | 72 mm1996 · driest 1 mm in 1990 | 26 |
| February | 17.2°C13 Feb 1990 | -37.2°C2 Feb 1996 | 30 mm25 Feb 2007 | 50 mm2001 · driest 0 mm in 1987 | 26 |
| March | 28.3°C30 Mar 1986 | -24.4°C6 Mar 1989 | 35 mm28 Mar 1998 | 102 mm1990 · driest 8 mm in 1994 | 26 |
| April | 33.9°C19 Apr 1985 | -13.3°C4 Apr 1995 | 58 mm12 Apr 2005 | 155 mm1999 · driest 11 mm in 1987 | 26 |
| May | 35.6°C18 May 1987 | -3.3°C3 May 2005 | 48 mm13 May 2005 | 172 mm1991 · driest 32 mm in 2009 | 26 |
| June | 40.6°C22 Jun 1988 | 1.7°C3 Jun 1985 | 158 mm9 Jun 2004 | 239 mm2010 · driest 21 mm in 1988 | 26 |
| July | 40.0°C4 Jul 1990 | 6.7°C22 Jul 1985 | 72 mm2 Jul 1992 | 214 mm1990 · driest 32 mm in 1988 | 26 |
| August | 41.7°C1 Aug 1988 | 3.3°C20 Aug 1985 | 117 mm19 Aug 2007 | 225 mm1993 · driest 37 mm in 2001 | 26 |
| September | 35.6°C6 Sep 1990 | -5.0°C27 Sep 1984 | 98 mm23 Sep 2010 | 244 mm2010 · driest 11 mm in 1999 | 27 |
| October | 33.3°C4 Oct 1997 | -10.6°C30 Oct 1988 | 49 mm2 Oct 2009 | 156 mm2009 · driest 5 mm in 1988 | 26 |
| November | 28.3°C9 Nov 2006 | -25.6°C7 Nov 1991 | 45 mm1 Nov 1991 | 108 mm1996 · driest 3 mm in 2009 | 26 |
| December | 20.6°C2 Dec 1998 | -32.2°C23 Dec 1990 | 28 mm16 Dec 1984 | 66 mm2009 · driest 5 mm in 2002 | 26 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 31 | <1 | 5 |
| February | 0 | 0 | 27 | <1 | 4 |
| March | <1 | 0 | 26 | 2 | 4 |
| April | 2 | <1 | 12 | 3 | <1 |
| May | 8 | 2 | 1 | 4 | 0 |
| June | 19 | 6 | 0 | 4 | 0 |
| July | 25 | 8 | 0 | 4 | 0 |
| August | 22 | 6 | 0 | 3 | 0 |
| September | 12 | 3 | 1 | 2 | 0 |
| October | 4 | <1 | 10 | 2 | <1 |
| November | <1 | 0 | 23 | 2 | 3 |
| December | 0 | 0 | 30 | <1 | 6 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 0% | 15% | 2% | 11% | -7.5–0.9°C |
| February | 0% | 14% | 1% | 7% | -5.9–2.8°C |
| March | 3% | 20% | 6% | 19% | 1.9–8.2°C |
| April | 20% | 28% | 9% | 31% | 11.4–17.2°C |
| May | 45% | 30% | 11% | 39% | 18.3–24.6°C |
| June | 63% | 33% | 13% | 42% | 24.2–28.5°C |
| July | 72% | 27% | 12% | 28% | 26.1–30.4°C |
| August | 73% | 25% | 10% | 26% | 25.0–28.9°C |
| September | 54% | 24% | 9% | 26% | 20.8–25.0°C |
| October | 22% | 20% | 6% | 21% | 13.8–17.5°C |
| November | 3% | 18% | 5% | 15% | 1.1–10.0°C |
| December | <1% | 18% | 2% | 13% | -6.5–2.2°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