September
September · May · October
United States · 1991–2020
September leads for comfortable weather in Kampsville: typically 27.1°C by day, 13.6°C at night, with 83 mm of rain. Based on measured 1991–2020 NOAA station history.
September · May · October
August · July · June
October · April · September
The weakest month is January, scoring 5 against September’s 78 — days reach only 4.4°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 | 4.4°C | -6.3°C | 54 mm | 5.8 | 9 h 41 | 5 | Strong coverage |
| February | 7.5°C | -4.3°C | 51 mm | 5.3 | 10 h 39 | 7 | Strong coverage |
| March | 14°C | 0.8°C | 74 mm | 7.1 | 11 h 50 | 32 | Strong coverage |
| April | 20.6°C | 6.5°C | 96 mm | 8.2 | 13 h 11 | 60 | Strong coverage |
| May | 25.3°C | 12.3°C | 118 mm | 9.3 | 14 h 18 | 74 | Strong coverage |
| June | 29.9°C | 17.2°C | 106 mm | 7.3 | 14 h 55 | 63 | Strong coverage |
| July | 31.7°C | 19.4°C | 97 mm | 6.5 | 14 h 41 | 55 | Strong coverage |
| August | 30.8°C | 18.3°C | 73 mm | 4.8 | 13 h 42 | 65 | Strong coverage |
| September | 27.1°C | 13.6°C | 83 mm | 5.8 | 12 h 24 | 78 | Strong coverage |
| October | 20.7°C | 7.3°C | 77 mm | 6.2 | 11 h 06 | 66 | Strong coverage |
| November | 13.2°C | 1.3°C | 77 mm | 6 | 9 h 58 | 31 | Strong coverage |
| December | 6.4°C | -3.7°C | 53 mm | 5.7 | 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 | 25.6°C25 Jan 1950 | -31.1°C15 Jan 1979 | 56 mm10 Jan 1975 | 192 mm2005 · driest 0 mm in 2020 | 93 |
| February | 28.9°C27 Feb 2024 | -31.1°C27 Feb 1934 | 51 mm10 Feb 1959 | 151 mm1951 · driest 0 mm in 1947 | 93 |
| March | 31.1°C29 Mar 1986 | -25.6°C12 Mar 1948 | 79 mm13 Mar 1972 | 216 mm1973 · driest 0 mm in 2022 | 95 |
| April | 34.4°C25 Apr 1986 | -8.9°C14 Apr 1950 | 87 mm12 Apr 1994 | 294 mm1994 · driest 1 mm in 2018 | 94 |
| May | 38.9°C31 May 1934 | -2.2°C1 May 1950 | 94 mm10 May 1981 | 352 mm2002 · driest 0 mm in 2021 | 92 |
| June | 41.7°C19 Jun 1936 | 3.3°C1 Jun 1972 | 112 mm20 Jun 1993 | 281 mm1993 · driest 1 mm in 1959 | 94 |
| July | 46.7°C15 Jul 1954 | 4.4°C13 Jul 1975 | 89 mm4 Jul 1962 | 264 mm2008 · driest 0 mm in 2022 | 92 |
| August | 43.3°C9 Aug 1934 | 3.9°C29 Aug 1986 | 98 mm16 Aug 1946 | 263 mm1946 · driest 0 mm in 2020 | 91 |
| September | 40.6°C1 Sep 1984 | -3.3°C28 Sep 1942 | 101 mm2 Sep 2003 | 295 mm2008 · driest 0 mm in 1940 | 92 |
| October | 35.0°C1 Oct 1952 | -10.0°C29 Oct 1952 | 114 mm5 Oct 1941 | 325 mm1941 · driest 0 mm in 2022 | 92 |
| November | 31.1°C1 Nov 1950 | -21.7°C8 Nov 1991 | 105 mm4 Nov 2024 | 268 mm1985 · driest 0 mm in 2020 | 93 |
| December | 25.0°C15 Dec 1948 | -30.6°C23 Dec 1989 | 128 mm3 Dec 1982 | 294 mm1982 · driest 0 mm in 2019 | 94 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 26 | 2 | 3 |
| February | <1 | 0 | 22 | 2 | 3 |
| March | 3 | 0 | 15 | 2 | 1 |
| April | 8 | 1 | 4 | 3 | <1 |
| May | 18 | 6 | <1 | 3 | 0 |
| June | 28 | 17 | 0 | 3 | 0 |
| July | 31 | 22 | 0 | 3 | 0 |
| August | 30 | 19 | 0 | 2 | 0 |
| September | 21 | 8 | 0 | 3 | 0 |
| October | 8 | 1 | 3 | 3 | 0 |
| November | 1 | 0 | 13 | 2 | <1 |
| December | 0 | 0 | 23 | 2 | 2 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 1% | 18% | 5% | 16% | 0.6–8.1°C |
| February | 5% | 19% | 6% | 17% | 2.6–10.7°C |
| March | 17% | 24% | 9% | 26% | 9.2–16.9°C |
| April | 39% | 28% | 10% | 34% | 16.8–22.6°C |
| May | 62% | 29% | 11% | 34% | 22.5–28.0°C |
| June | 75% | 25% | 10% | 27% | 28.1–32.2°C |
| July | 80% | 21% | 10% | 19% | 30.1–34.0°C |
| August | 81% | 19% | 8% | 16% | 29.2–33.0°C |
| September | 76% | 20% | 9% | 17% | 24.7–29.7°C |
| October | 51% | 20% | 8% | 20% | 18.8–23.7°C |
| November | 15% | 20% | 8% | 18% | 9.3–15.8°C |
| December | 2% | 20% | 6% | 18% | 2.3–9.7°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