September
September · August · June
United States · 1991–2020
September leads for comfortable weather in Waynesburg: typically 24.4°C by day, 11.6°C at night, with 86 mm of rain. Based on measured 1991–2020 NOAA station history.
September · August · June
July · August · June
May · October · September
The weakest month is January, scoring 5 against September’s 81 — days reach only 0.6°C, 23° 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 | 0.6°C | -7.7°C | 72 mm | 9.8 | 9 h 32 | 5 | Strong coverage |
| February | 2.1°C | -7°C | 55 mm | 8.6 | 10 h 34 | 5 | Strong coverage |
| March | 7.9°C | -2.5°C | 65 mm | 8.8 | 11 h 49 | 6 | Strong coverage |
| April | 15.7°C | 3.2°C | 91 mm | 10.8 | 13 h 15 | 37 | Strong coverage |
| May | 21.8°C | 9.2°C | 100 mm | 11.1 | 14 h 27 | 66 | Strong coverage |
| June | 26.7°C | 14.6°C | 115 mm | 9.7 | 15 h 06 | 73 | Strong coverage |
| July | 28.6°C | 16.5°C | 105 mm | 8.8 | 14 h 51 | 67 | Strong coverage |
| August | 27.6°C | 15.5°C | 82 mm | 6.9 | 13 h 48 | 77 | Strong coverage |
| September | 24.4°C | 11.6°C | 86 mm | 7.8 | 12 h 25 | 81 | Strong coverage |
| October | 17.2°C | 5.5°C | 73 mm | 7.9 | 11 h 02 | 51 | Strong coverage |
| November | 9.6°C | 0.1°C | 73 mm | 7.9 | 9 h 50 | 16 | Strong coverage |
| December | 3.4°C | -4.4°C | 67 mm | 8.7 | 9 h 15 | 5 | Strong coverage |
What has changed
Each bar compares the 2011–2025 daytime average for that month against the same month in 1961–1990, measured at the same station. Months where the older record is too thin to compare are left blank.
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 24.4°C21 Jan 1906 | -32.2°C19 Jan 1994 | 64 mm22 Jan 1959 | 270 mm1937 · driest 15 mm in 1900 | 132 |
| February | 23.3°C21 Feb 2018 | -33.3°C10 Feb 1899 | 76 mm10 Feb 1959 | 157 mm2011 · driest 5 mm in 1987 | 131 |
| March | 28.3°C22 Mar 2012 | -26.7°C12 Mar 1948 | 88 mm25 Mar 1913 | 264 mm1913 · driest 3 mm in 1899 | 130 |
| April | 32.2°C18 Apr 1896 | -12.2°C7 Apr 1982 | 66 mm14 Apr 1979 | 201 mm2026 · driest 19 mm in 1946 | 132 |
| May | 37.2°C29 May 1929 | -3.9°C3 May 1908 | 76 mm6 May 1894 | 235 mm1894 · driest 11 mm in 1934 | 133 |
| June | 38.9°C6 Jun 1925 | 0.0°C30 Jun 1919 | 191 mm21 Jun 1937 | 376 mm1937 · driest 7 mm in 1933 | 132 |
| July | 40.6°C5 Jul 1897 | 2.8°C17 Jul 1925 | 91 mm17 Jul 2021 | 255 mm1992 · driest 20 mm in 2016 | 133 |
| August | 43.9°C7 Aug 1918 | 0.6°C30 Aug 1946 | 221 mm21 Aug 2007 | 305 mm2007 · driest 8 mm in 1970 | 133 |
| September | 37.8°C3 Sep 1898 | -3.9°C21 Sep 1956 | 91 mm4 Sep 1991 | 215 mm2012 · driest 12 mm in 1941 | 131 |
| October | 32.2°C6 Oct 1900 | -11.1°C30 Oct 1895 | 81 mm6 Oct 1910 | 231 mm1919 · driest 0 mm in 1963 | 128 |
| November | 26.7°C2 Nov 2016 | -22.2°C30 Nov 1958 | 68 mm30 Nov 1927 | 222 mm1985 · driest 10 mm in 1976 | 129 |
| December | 22.2°C4 Dec 1982 | -28.3°C10 Dec 1958 | 64 mm22 Dec 2013 | 205 mm1990 · driest 0 mm in 1925 | 130 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 27 | 2 | 8 |
| February | 0 | 0 | 25 | 2 | 6 |
| March | <1 | 0 | 22 | 2 | 3 |
| April | 3 | <1 | 9 | 3 | <1 |
| May | 11 | 3 | <1 | 4 | 0 |
| June | 21 | 8 | 0 | 4 | 0 |
| July | 27 | 12 | 0 | 4 | 0 |
| August | 25 | 8 | 0 | 3 | 0 |
| September | 15 | 4 | <1 | 3 | 0 |
| October | 4 | <1 | 4 | 2 | 0 |
| November | <1 | 0 | 16 | 3 | 1 |
| December | 0 | 0 | 25 | 2 | 5 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | <1% | 29% | 8% | 31% | -2.7–5.2°C |
| February | <1% | 27% | 7% | 28% | -1.2–6.3°C |
| March | 6% | 29% | 9% | 35% | 4.6–12.6°C |
| April | 19% | 35% | 10% | 46% | 12.9–18.5°C |
| May | 42% | 36% | 11% | 47% | 18.9–25.2°C |
| June | 65% | 32% | 13% | 38% | 24.6–29.3°C |
| July | 71% | 29% | 12% | 30% | 27.3–31.5°C |
| August | 75% | 25% | 9% | 24% | 26.3–30.1°C |
| September | 62% | 26% | 9% | 27% | 22.5–26.8°C |
| October | 30% | 25% | 8% | 25% | 14.8–20.6°C |
| November | 5% | 27% | 8% | 31% | 6.8–12.6°C |
| December | <1% | 28% | 8% | 33% | -0.3–6.3°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