September
September · May · October
United States · 1991–2020
September leads for comfortable weather in Marston: typically 27.8°C by day, 15.5°C at night, with 97 mm of rain. Based on measured 1991–2020 NOAA station history.
September · May · October
August · June · July
October · April · March
The weakest month is January, scoring 5 against September’s 76 — days reach only 6.5°C, 17° 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 | 6.5°C | -2.3°C | 99 mm | 7.7 | 9 h 55 | 5 | Good coverage |
| February | 9.3°C | -0.5°C | 81 mm | 7.3 | 10 h 48 | 13 | Good coverage |
| March | 14.9°C | 4°C | 102 mm | 8 | 11 h 51 | 36 | Good coverage |
| April | 20.9°C | 9.7°C | 138 mm | 8.9 | 13 h 04 | 60 | Good coverage |
| May | 25.8°C | 15.2°C | 136 mm | 9.5 | 14 h 05 | 74 | Good coverage |
| June | 30.7°C | 19.9°C | 106 mm | 7.4 | 14 h 38 | 55 | Good coverage |
| July | 32.5°C | 22°C | 97 mm | 6.1 | 14 h 25 | 48 | Good coverage |
| August | 32.2°C | 20.6°C | 59 mm | 4.6 | 13 h 33 | 58 | Good coverage |
| September | 27.8°C | 15.5°C | 97 mm | 5.2 | 12 h 22 | 76 | Good coverage |
| October | 22.1°C | 9.4°C | 100 mm | 5.9 | 11 h 11 | 72 | Good coverage |
| November | 14.4°C | 4.2°C | 120 mm | 7.8 | 10 h 10 | 33 | Good coverage |
| December | 7.9°C | -0.8°C | 98 mm | 7.9 | 9 h 41 | 5 | Good coverage |
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 21.7°C30 Jan 1987 | -25.6°C17 Jan 1982 | 146 mm2 Jan 1966 | 226 mm1966 · driest 17 mm in 2001 | 47 |
| February | 25.0°C27 Feb 1981 | -20.0°C4 Feb 1996 | 89 mm14 Feb 1989 | 296 mm1990 · driest 25 mm in 2010 | 46 |
| March | 28.9°C31 Mar 1986 | -13.3°C2 Mar 1980 | 169 mm9 Mar 1964 | 366 mm1964 · driest 18 mm in 1966 | 48 |
| April | 34.4°C28 Apr 1987 | -3.9°C8 Apr 1990 | 94 mm2 Apr 1979 | 333 mm2011 · driest 52 mm in 1987 | 47 |
| May | 35.6°C26 May 2006 | 1.7°C2 May 1978 | 248 mm15 May 1986 | 366 mm1986 · driest 16 mm in 2005 | 47 |
| June | 40.0°C27 Jun 1988 | 8.3°C1 Jun 1993 | 76 mm14 Jun 1997 | 224 mm1970 · driest 12 mm in 1988 | 46 |
| July | 41.1°C12 Jul 1980 | 11.1°C4 Jul 1968 | 122 mm28 Jul 1972 | 289 mm1981 · driest 4 mm in 1999 | 46 |
| August | 41.7°C4 Aug 1964 | 5.6°C29 Aug 1986 | 93 mm30 Aug 1978 | 148 mm1982 · driest 0 mm in 1999 | 46 |
| September | 38.3°C12 Sep 1983 | 1.7°C24 Sep 1989 | 289 mm23 Sep 2006 | 388 mm2006 · driest 4 mm in 1978 | 45 |
| October | 33.3°C1 Oct 1986 | -3.9°C5 Oct 1988 | 117 mm20 Oct 1985 | 328 mm2009 · driest 0 mm in 1964 | 44 |
| November | 29.4°C5 Nov 1987 | -10.6°C26 Nov 1977 | 109 mm19 Nov 1988 | 293 mm2011 · driest 27 mm in 2009 | 45 |
| December | 23.3°C5 Dec 1998 | -23.9°C22 Dec 1989 | 107 mm3 Dec 1978 | 300 mm1990 · driest 12 mm in 1976 | 44 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) |
|---|---|---|---|---|
| January | 0 | 0 | 20 | 3 |
| February | 0 | 0 | 15 | 3 |
| March | 2 | 0 | 8 | 3 |
| April | 8 | <1 | <1 | 5 |
| May | 19 | 5 | 0 | 4 |
| June | 28 | 19 | 0 | 3 |
| July | 30 | 25 | 0 | 3 |
| August | 30 | 24 | 0 | 2 |
| September | 23 | 10 | 0 | 3 |
| October | 11 | 2 | <1 | 3 |
| November | <1 | 0 | 7 | 4 |
| December | 0 | 0 | 17 | 3 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | <1% | 24% | 9% | 25% | 2.2–9.4°C |
| February | 2% | 26% | 10% | 25% | 5.1–11.5°C |
| March | 18% | 27% | 11% | 33% | 11.0–17.1°C |
| April | 42% | 30% | 15% | 36% | 18.5–23.1°C |
| May | 66% | 28% | 13% | 30% | 23.6–28.4°C |
| June | 76% | 24% | 11% | 25% | 28.8–32.2°C |
| July | 78% | 22% | 11% | 19% | 30.9–34.1°C |
| August | 83% | 17% | 7% | 13% | 29.7–34.1°C |
| September | 78% | 19% | 9% | 16% | 26.1–30.2°C |
| October | 54% | 20% | 10% | 22% | 20.3–23.8°C |
| November | 16% | 26% | 13% | 28% | 11.6–17.1°C |
| December | <1% | 26% | 12% | 32% | 4.6–10.3°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