September
September · August · June
United States · 1991–2020
September leads for comfortable weather in New Vienna: typically 24.8°C by day, 12.6°C at night, with 82 mm of rain. Based on measured 1991–2020 NOAA station history.
September · August · June
July · August · June
October · September · May
The weakest month is January, scoring 5 against September’s 83 — days reach only 3.1°C, 21° 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 | 3.1°C | -6°C | 89 mm | 9.8 | 9 h 41 | 5 | Strong coverage |
| February | 5.1°C | -5°C | 82 mm | 8.9 | 10 h 39 | 5 | Strong coverage |
| March | 10.7°C | -0.6°C | 99 mm | 10.4 | 11 h 49 | 12 | Strong coverage |
| April | 17.4°C | 4.9°C | 123 mm | 10.8 | 13 h 11 | 41 | Strong coverage |
| May | 22.3°C | 10.8°C | 122 mm | 11.2 | 14 h 18 | 67 | Strong coverage |
| June | 26.8°C | 15.6°C | 117 mm | 9.7 | 14 h 55 | 72 | Strong coverage |
| July | 28.5°C | 17.5°C | 104 mm | 9.5 | 14 h 41 | 65 | Strong coverage |
| August | 27.8°C | 16.5°C | 94 mm | 7.5 | 13 h 42 | 73 | Strong coverage |
| September | 24.8°C | 12.6°C | 82 mm | 7.2 | 12 h 24 | 83 | Strong coverage |
| October | 18.5°C | 6.4°C | 82 mm | 8.1 | 11 h 06 | 55 | Strong coverage |
| November | 11.4°C | 0.7°C | 78 mm | 8.4 | 9 h 58 | 22 | Strong coverage |
| December | 5.8°C | -3°C | 93 mm | 9.7 | 9 h 25 | 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°C25 Jan 1950 | -30.6°C20 Jan 1985 | 56 mm23 Jan 1982 | 374 mm1937 · driest 9 mm in 1981 | 132 |
| February | 25.0°C22 Feb 2018 | -34.4°C10 Feb 1899 | 72 mm19 Feb 2000 | 207 mm2008 · driest 9 mm in 1902 | 134 |
| March | 30.0°C23 Mar 2026 | -23.3°C7 Mar 2015 | 119 mm5 Mar 1963 | 318 mm1964 · driest 1 mm in 1910 | 132 |
| April | 34.4°C18 Apr 1896 | -11.7°C1 Apr 1923 | 87 mm12 Apr 1948 | 296 mm2011 · driest 22 mm in 1971 | 133 |
| May | 37.2°C31 May 1895 | -5.0°C10 May 1966 | 107 mm22 May 1962 | 299 mm1990 · driest 16 mm in 1934 | 133 |
| June | 39.4°C3 Jun 1895 | 2.8°C5 Jun 1945 | 88 mm18 Jun 1911 | 309 mm2008 · driest 10 mm in 1988 | 132 |
| July | 40.6°C4 Jul 1897 | 5.0°C11 Jul 1898 | 183 mm23 Jul 1965 | 251 mm1965 · driest 14 mm in 1951 | 132 |
| August | 39.4°C27 Aug 1948 | 3.3°C30 Aug 1946 | 120 mm22 Aug 1990 | 261 mm1926 · driest 8 mm in 2025 | 131 |
| September | 40.6°C20 Sep 1895 | -3.9°C23 Sep 1974 | 103 mm14 Sep 1979 | 223 mm1979 · driest 11 mm in 1897 | 132 |
| October | 35.0°C15 Oct 1897 | -11.7°C21 Oct 1952 | 72 mm19 Oct 2004 | 229 mm1983 · driest 1 mm in 1963 | 132 |
| November | 29.4°C7 Nov 1895 | -18.3°C30 Nov 1958 | 81 mm6 Nov 2017 | 278 mm1985 · driest 9 mm in 1917 | 131 |
| December | 24.4°C3 Dec 1982 | -30.6°C11 Dec 1917 | 60 mm2 Dec 2007 | 245 mm2007 · driest 11 mm in 1965 | 131 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 25 | 3 | 3 |
| February | 0 | 0 | 22 | 3 | 3 |
| March | <1 | 0 | 18 | 3 | 2 |
| April | 3 | 0 | 6 | 4 | <1 |
| May | 11 | 2 | <1 | 4 | 0 |
| June | 22 | 7 | 0 | 4 | 0 |
| July | 28 | 11 | 0 | 3 | 0 |
| August | 26 | 8 | 0 | 3 | 0 |
| September | 16 | 4 | 0 | 3 | 0 |
| October | 5 | <1 | 3 | 3 | <1 |
| November | <1 | 0 | 16 | 3 | <1 |
| December | 0 | 0 | 23 | 3 | 2 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | <1% | 32% | 10% | 37% | -0.1–7.6°C |
| February | <1% | 30% | 9% | 38% | 1.1–9.3°C |
| March | 9% | 34% | 12% | 44% | 7.2–15.0°C |
| April | 26% | 35% | 13% | 46% | 15.0–19.9°C |
| May | 49% | 34% | 12% | 44% | 20.1–25.6°C |
| June | 66% | 32% | 12% | 38% | 24.9–29.7°C |
| July | 71% | 29% | 12% | 33% | 27.3–31.7°C |
| August | 74% | 25% | 11% | 25% | 26.7–30.8°C |
| September | 69% | 23% | 9% | 22% | 23.2–28.1°C |
| October | 40% | 24% | 8% | 26% | 16.8–22.0°C |
| November | 8% | 29% | 9% | 34% | 8.8–14.6°C |
| December | <1% | 30% | 10% | 36% | 1.9–8.7°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