September
September · May · August
United States · 1991–2020
September leads for comfortable weather in Urbana: typically 26°C by day, 13°C at night, with 86 mm of rain. Based on measured 1991–2020 NOAA station history.
September · May · August
August · July · June
October · April · May
The weakest month is January, scoring 5 against September’s 79 — days reach only 0.9°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 | 0.9°C | -7.7°C | 59 mm | 6.9 | 9 h 36 | 5 | Strong coverage |
| February | 3.7°C | -5.7°C | 54 mm | 6.7 | 10 h 37 | 5 | Strong coverage |
| March | 10.4°C | -0.5°C | 70 mm | 8.2 | 11 h 49 | 17 | Strong coverage |
| April | 17.4°C | 5.1°C | 101 mm | 9.6 | 13 h 12 | 45 | Strong coverage |
| May | 23.4°C | 11.3°C | 121 mm | 10.9 | 14 h 22 | 72 | Strong coverage |
| June | 28.2°C | 16.5°C | 118 mm | 8.9 | 15 h 00 | 66 | Strong coverage |
| July | 29.6°C | 18.3°C | 114 mm | 8.1 | 14 h 45 | 60 | Strong coverage |
| August | 28.9°C | 17.3°C | 90 mm | 7.1 | 13 h 45 | 68 | Strong coverage |
| September | 26°C | 13°C | 86 mm | 6.6 | 12 h 24 | 79 | Strong coverage |
| October | 18.8°C | 6.4°C | 85 mm | 7.6 | 11 h 04 | 56 | Strong coverage |
| November | 10.4°C | 0.3°C | 81 mm | 8 | 9 h 54 | 18 | Strong coverage |
| December | 3.6°C | -4.6°C | 60 mm | 7.2 | 9 h 20 | 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 | 21.1°C23 Jan 1909 | -31.7°C19 Jan 1994 | 63 mm11 Jan 2020 | 194 mm1950 · driest 2 mm in 1986 | 124 |
| February | 23.9°C27 Feb 2024 | -31.7°C13 Feb 1905 | 81 mm21 Feb 2018 | 156 mm2018 · driest 4 mm in 1947 | 124 |
| March | 31.1°C27 Mar 2026 | -22.8°C6 Mar 2015 | 74 mm13 Mar 1917 | 212 mm1922 · driest 10 mm in 1910 | 124 |
| April | 32.8°C11 Apr 1930 | -10.0°C2 Apr 2018 | 79 mm20 Apr 1964 | 243 mm1964 · driest 15 mm in 1976 | 124 |
| May | 36.1°C31 May 1934 | -3.3°C1 May 1903 | 114 mm26 May 1921 | 285 mm1943 · driest 6 mm in 1925 | 123 |
| June | 39.4°C25 Jun 1988 | 2.8°C4 Jun 1945 | 99 mm19 Jun 1983 | 238 mm1947 · driest 8 mm in 1988 | 124 |
| July | 42.8°C14 Jul 1954 | 5.0°C2 Jul 1904 | 113 mm30 Jul 1987 | 351 mm1992 · driest 12 mm in 1930 | 124 |
| August | 38.9°C17 Aug 1988 | 3.9°C31 Aug 1915 | 135 mm12 Aug 1993 | 255 mm1993 · driest 9 mm in 2013 | 124 |
| September | 38.9°C1 Sep 2011 | -1.7°C28 Sep 1942 | 99 mm15 Sep 1931 | 248 mm1926 · driest 6 mm in 1954 | 124 |
| October | 33.9°C3 Oct 1954 | -10.6°C30 Oct 1925 | 95 mm21 Oct 1983 | 229 mm1941 · driest 4 mm in 1964 | 124 |
| November | 26.7°C1 Nov 1950 | -20.6°C25 Nov 1950 | 103 mm2 Nov 1936 | 256 mm1985 · driest 0 mm in 1904 | 124 |
| December | 21.7°C4 Dec 1998 | -28.9°C28 Dec 1924 | 70 mm7 Dec 1966 | 190 mm2015 · driest 3 mm in 1919 | 124 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 28 | 2 | 5 |
| February | 0 | 0 | 25 | 2 | 4 |
| March | <1 | 0 | 18 | 3 | 2 |
| April | 4 | <1 | 5 | 4 | <1 |
| May | 14 | 4 | <1 | 4 | 0 |
| June | 25 | 11 | 0 | 4 | 0 |
| July | 29 | 15 | 0 | 4 | 0 |
| August | 28 | 12 | 0 | 3 | 0 |
| September | 18 | 7 | <1 | 3 | 0 |
| October | 6 | <1 | 3 | 3 | 0 |
| November | <1 | 0 | 16 | 3 | 1 |
| December | 0 | 0 | 25 | 2 | 4 |
The best month has moved. On the 1961–1990 numbers the strongest month here was September (scoring 85); on 2011–2025 it is May (84). 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 | <1% | 22% | 5% | 20% | -2.7–4.5°C |
| February | <1% | 22% | 6% | 22% | -0.7–7.1°C |
| March | 8% | 27% | 9% | 32% | 5.9–13.6°C |
| April | 24% | 32% | 11% | 41% | 14.1–19.5°C |
| May | 53% | 31% | 12% | 39% | 20.2–25.9°C |
| June | 70% | 28% | 12% | 31% | 25.5–30.1°C |
| July | 76% | 24% | 10% | 23% | 28.0–32.3°C |
| August | 77% | 23% | 9% | 21% | 27.1–31.1°C |
| September | 70% | 22% | 9% | 22% | 23.5–28.1°C |
| October | 39% | 22% | 8% | 23% | 16.6–21.8°C |
| November | 7% | 24% | 8% | 24% | 6.9–12.8°C |
| December | <1% | 23% | 7% | 23% | -0.3–6.7°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