September
September · May · October
United States · 1991–2020
September leads for comfortable weather in Duquesne: typically 27.9°C by day, 15.4°C at night, with 106 mm of rain. Based on measured 1991–2020 NOAA station history.
September · May · October
August · July · June
October · April · March
The weakest month is January, scoring 7 against September’s 74 — days reach only 7.3°C, 17° below the 24°C the score treats as ideal, and nights drop to -3.7°C.
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 | 7.3°C | -3.7°C | 49 mm | 5.4 | 9 h 52 | 7 | Strong coverage |
| February | 10.2°C | -1.6°C | 49 mm | 5.1 | 10 h 46 | 21 | Strong coverage |
| March | 15.5°C | 3.2°C | 81 mm | 7.9 | 11 h 51 | 40 | Strong coverage |
| April | 20.8°C | 8.3°C | 127 mm | 8.7 | 13 h 06 | 59 | Strong coverage |
| May | 25.1°C | 13.6°C | 167 mm | 10.3 | 14 h 08 | 69 | Strong coverage |
| June | 30.1°C | 18.7°C | 142 mm | 8.7 | 14 h 42 | 53 | Strong coverage |
| July | 32.5°C | 21.1°C | 99 mm | 6.7 | 14 h 28 | 49 | Strong coverage |
| August | 32.4°C | 20.2°C | 85 mm | 6.2 | 13 h 35 | 53 | Strong coverage |
| September | 27.9°C | 15.4°C | 106 mm | 6.2 | 12 h 22 | 74 | Strong coverage |
| October | 21.6°C | 9°C | 96 mm | 6.9 | 11 h 10 | 69 | Strong coverage |
| November | 14.8°C | 3.1°C | 84 mm | 6.3 | 10 h 08 | 38 | Strong coverage |
| December | 8.9°C | -1.7°C | 66 mm | 5.9 | 9 h 38 | 13 | 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 | 25.0°C24 Jan 1950 | -24.4°C20 Jan 1985 | 61 mm30 Jan 1975 | 177 mm1949 · driest 0 mm in 1961 | 79 |
| February | 30.6°C22 Feb 1996 | -26.0°C16 Feb 2021 | 119 mm22 Feb 1985 | 199 mm1985 · driest 0 mm in 2006 | 79 |
| March | 33.9°C21 Mar 2026 | -20.6°C11 Mar 1948 | 82 mm18 Mar 2008 | 230 mm1973 · driest 9 mm in 1956 | 79 |
| April | 35.6°C12 Apr 1972 | -7.2°C8 Apr 2007 | 115 mm29 Apr 2017 | 285 mm2017 · driest 3 mm in 1989 | 79 |
| May | 35.0°C31 May 1949 | -1.1°C1 May 1960 | 145 mm7 May 2008 | 360 mm2019 · driest 37 mm in 1988 | 79 |
| June | 39.4°C11 Jun 1953 | 6.7°C10 Jun 1988 | 133 mm23 Jun 1976 | 435 mm2007 · driest 15 mm in 1954 | 79 |
| July | 46.1°C14 Jul 1954 | 10.0°C13 Jul 1975 | 174 mm3 Jul 1976 | 372 mm1958 · driest 0 mm in 2012 | 79 |
| August | 43.3°C2 Aug 2011 | 7.8°C21 Aug 1950 | 125 mm14 Aug 1980 | 217 mm1964 · driest 1 mm in 2000 | 78 |
| September | 40.6°C1 Sep 2000 | -1.1°C30 Sep 1984 | 181 mm30 Sep 1986 | 485 mm1986 · driest 5 mm in 2013 | 78 |
| October | 34.4°C1 Oct 1953 | -7.8°C31 Oct 1993 | 136 mm8 Oct 2009 | 249 mm1959 · driest 1 mm in 1963 | 78 |
| November | 30.6°C9 Nov 2006 | -14.3°C18 Nov 2014 | 92 mm20 Nov 1979 | 313 mm1985 · driest 0 mm in 1955 | 78 |
| December | 26.1°C27 Dec 2025 | -26.1°C23 Dec 1989 | 91 mm4 Dec 1999 | 248 mm2015 · driest 1 mm in 2025 | 78 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 23 | 2 | 3 |
| February | <1 | 0 | 18 | 2 | 1 |
| March | 3 | <1 | 10 | 3 | 1 |
| April | 9 | 1 | 2 | 4 | <1 |
| May | 18 | 5 | <1 | 5 | 0 |
| June | 28 | 18 | 0 | 4 | 0 |
| July | 31 | 25 | 0 | 3 | 0 |
| August | 30 | 24 | 0 | 3 | 0 |
| September | 23 | 11 | 0 | 3 | 0 |
| October | 10 | 2 | 2 | 3 | <1 |
| November | 1 | 0 | 10 | 3 | <1 |
| December | 0 | 0 | 21 | 2 | 2 |
The best month has moved. On the 1961–1990 numbers the strongest month here was May (scoring 82); on 2011–2025 it is September (77). Both are scored the same way, from the same station — only the climate underneath changed.
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 3% | 16% | 5% | 13% | 3.3–9.6°C |
| February | 9% | 19% | 6% | 14% | 5.5–13.2°C |
| March | 24% | 24% | 9% | 28% | 11.8–17.5°C |
| April | 45% | 28% | 12% | 33% | 18.4–23.0°C |
| May | 60% | 32% | 15% | 41% | 22.9–26.9°C |
| June | 72% | 28% | 14% | 31% | 27.4–32.0°C |
| July | 80% | 20% | 9% | 19% | 30.4–34.1°C |
| August | 79% | 21% | 9% | 22% | 29.8–34.7°C |
| September | 75% | 22% | 11% | 20% | 25.3–30.4°C |
| October | 54% | 21% | 9% | 22% | 19.0–23.7°C |
| November | 20% | 20% | 8% | 17% | 11.0–17.0°C |
| December | 4% | 19% | 6% | 17% | 6.0–11.6°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