September
September · May · June
United States · 1991–2020
September leads for comfortable weather in Blandon: typically 24.9°C by day, 13.1°C at night, with 120 mm of rain. Based on measured 1991–2020 NOAA station history.
September · May · June
August · July · June
May · October · April
The weakest month is January, scoring 5 against September’s 78 — days reach only 3.8°C, 20° 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 | 3.8°C | -5°C | 79 mm | 7.5 | 9 h 35 | 5 | Good coverage |
| February | 5.1°C | -4.5°C | 61 mm | 5.9 | 10 h 36 | 5 | Good coverage |
| March | 9.9°C | -0.3°C | 104 mm | 8.1 | 11 h 49 | 12 | Good coverage |
| April | 16.8°C | 5.1°C | 83 mm | 8 | 13 h 13 | 47 | Good coverage |
| May | 22.5°C | 10.5°C | 80 mm | 8.9 | 14 h 24 | 75 | Good coverage |
| June | 27.2°C | 15.9°C | 114 mm | 9.3 | 15 h 03 | 71 | Good coverage |
| July | 29.5°C | 18.2°C | 122 mm | 8.9 | 14 h 47 | 59 | Good coverage |
| August | 29.1°C | 17.7°C | 87 mm | 6.7 | 13 h 46 | 68 | Good coverage |
| September | 24.9°C | 13.1°C | 120 mm | 6.9 | 12 h 25 | 78 | Good coverage |
| October | 18.4°C | 6.7°C | 104 mm | 6.9 | 11 h 03 | 53 | Good coverage |
| November | 12.2°C | 2.2°C | 83 mm | 6.7 | 9 h 52 | 28 | Good coverage |
| December | 6.1°C | -2.5°C | 86 mm | 7.4 | 9 h 18 | 5 | Good coverage |
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 21.7°C7 Jan 2007 | -28.9°C21 Jan 1994 | 54 mm8 Jan 1979 | 261 mm1979 · driest 12 mm in 1970 | 39 |
| February | 25.0°C25 Feb 1985 | -22.2°C18 Feb 1979 | 65 mm14 Feb 2007 | 149 mm1971 · driest 16 mm in 2002 | 39 |
| March | 31.1°C31 Mar 1998 | -18.9°C10 Mar 1984 | 121 mm17 Mar 2004 | 190 mm1993 · driest 15 mm in 2006 | 38 |
| April | 36.1°C20 Apr 1976 | -8.9°C7 Apr 1982 | 59 mm2 Apr 1970 | 210 mm1983 · driest 19 mm in 1987 | 38 |
| May | 35.6°C21 May 1996 | -3.3°C1 May 1978 | 96 mm6 May 1989 | 296 mm1989 · driest 16 mm in 1969 | 39 |
| June | 36.1°C8 Jun 1999 | 2.2°C11 Jun 1972 | 165 mm23 Jun 1972 | 400 mm1972 · driest 30 mm in 1988 | 39 |
| July | 38.9°C7 Jul 1999 | 7.8°C27 Jul 1977 | 111 mm26 Jul 2001 | 309 mm1969 · driest 15 mm in 1999 | 39 |
| August | 38.9°C1 Aug 1999 | 5.6°C31 Aug 1976 | 104 mm22 Aug 1994 | 208 mm1978 · driest 4 mm in 1995 | 39 |
| September | 37.8°C11 Sep 1983 | -1.1°C24 Sep 1974 | 159 mm9 Sep 1987 | 284 mm1999 · driest 7 mm in 1998 | 39 |
| October | 33.3°C10 Oct 2007 | -6.7°C24 Oct 1969 | 118 mm9 Oct 2005 | 271 mm2005 · driest 8 mm in 2001 | 39 |
| November | 27.8°C3 Nov 1982 | -13.3°C30 Nov 1976 | 80 mm25 Nov 1971 | 211 mm1971 · driest 13 mm in 2000 | 39 |
| December | 25.0°C30 Dec 1984 | -20.0°C26 Dec 1980 | 82 mm13 Dec 1983 | 226 mm1983 · driest 20 mm in 1980 | 39 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 25 | 3 | 3 |
| February | 0 | 0 | 23 | 2 | 3 |
| March | <1 | <1 | 17 | 3 | 2 |
| April | 3 | <1 | 4 | 3 | <1 |
| May | 10 | 4 | 0 | 2 | 0 |
| June | 22 | 10 | 0 | 4 | 0 |
| July | 28 | 15 | 0 | 4 | 0 |
| August | 28 | 14 | 0 | 3 | 0 |
| September | 15 | 4 | <1 | 3 | 0 |
| October | 4 | <1 | 3 | 3 | 0 |
| November | <1 | 0 | 11 | 3 | <1 |
| December | 0 | 0 | 23 | 3 | 1 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | <1% | 25% | 10% | 26% | -0.5–6.6°C |
| February | <1% | 24% | 9% | 21% | 1.3–8.4°C |
| March | 7% | 27% | 10% | 33% | 7.1–13.1°C |
| April | 23% | 29% | 10% | 33% | 15.0–18.9°C |
| May | 51% | 32% | 11% | 44% | 20.6–25.2°C |
| June | 66% | 32% | 13% | 38% | 25.5–28.7°C |
| July | 71% | 29% | 13% | 32% | 27.7–31.4°C |
| August | 75% | 25% | 10% | 26% | 27.0–30.5°C |
| September | 70% | 23% | 10% | 25% | 23.1–27.3°C |
| October | 33% | 23% | 9% | 23% | 16.5–20.7°C |
| November | 7% | 25% | 10% | 23% | 10.0–14.7°C |
| December | <1% | 25% | 10% | 27% | 3.0–9.0°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