September
September · June · May
United States · 1991–2020
September leads for comfortable weather in Barthell: typically 26°C by day, 11.8°C at night, with 101 mm of rain. Based on measured 1991–2020 NOAA station history.
September · June · May
August · June · July
October · April · September
The weakest month is January, scoring 5 against September’s 75 — days reach only 7.3°C, 17° below the 24°C the score treats as ideal, and nights drop to -4.6°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 | -4.6°C | 109 mm | 9.1 | 9 h 54 | 5 | Good coverage |
| February | 9.4°C | -3.8°C | 117 mm | 9.1 | 10 h 47 | 5 | Good coverage |
| March | 15.4°C | 0.5°C | 128 mm | 8.7 | 11 h 51 | 27 | Good coverage |
| April | 20.6°C | 4.5°C | 119 mm | 8.9 | 13 h 05 | 53 | Good coverage |
| May | 24.7°C | 9.7°C | 134 mm | 9.8 | 14 h 06 | 68 | Good coverage |
| June | 28.2°C | 14.7°C | 117 mm | 8 | 14 h 39 | 70 | Good coverage |
| July | 29.9°C | 17.2°C | 150 mm | 9.4 | 14 h 26 | 55 | Good coverage |
| August | 29.4°C | 16.2°C | 94 mm | 6.7 | 13 h 33 | 68 | Good coverage |
| September | 26°C | 11.8°C | 101 mm | 6.2 | 12 h 22 | 75 | Good coverage |
| October | 20.7°C | 4.5°C | 73 mm | 6.2 | 11 h 11 | 62 | Good coverage |
| November | 14.3°C | -0.2°C | 95 mm | 7.2 | 10 h 10 | 28 | Good coverage |
| December | 8.8°C | -2.8°C | 134 mm | 8.9 | 9 h 40 | 5 | Good coverage |
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 24.4°C25 Jan 1943 | -31.1°C21 Jan 1985 | 68 mm8 Jan 1998 | 317 mm1937 · driest 29 mm in 1986 | 48 |
| February | 25.6°C21 Feb 2018 | -27.2°C4 Feb 1996 | 107 mm6 Feb 2004 | 300 mm1939 · driest 18 mm in 1941 | 48 |
| March | 30.6°C23 Mar 2026 | -19.4°C15 Mar 1993 | 89 mm18 Mar 2002 | 271 mm1997 · driest 0 mm in 1999 | 50 |
| April | 33.9°C30 Apr 1942 | -9.4°C8 Apr 2007 | 69 mm17 Apr 1998 | 238 mm2003 · driest 17 mm in 1942 | 49 |
| May | 35.6°C22 May 1941 | -2.8°C5 May 1997 | 102 mm7 May 1984 | 259 mm1983 · driest 16 mm in 1941 | 52 |
| June | 38.3°C18 Jun 1936 | 2.2°C12 Jun 1988 | 83 mm4 Jun 1983 | 252 mm1989 · driest 0 mm in 1993 | 51 |
| July | 42.2°C12 Jul 1936 | 4.4°C4 Jul 1988 | 103 mm8 Jul 2022 | 611 mm2022 · driest 16 mm in 1944 | 54 |
| August | 38.3°C11 Aug 1980 | 4.4°C30 Aug 1986 | 99 mm19 Aug 2010 | 251 mm2017 · driest 28 mm in 2016 | 53 |
| September | 35.6°C10 Sep 1983 | -1.7°C30 Sep 1991 | 101 mm2 Sep 1982 | 279 mm1989 · driest 0 mm in 1993 | 51 |
| October | 33.9°C7 Oct 1941 | -8.3°C23 Oct 1987 | 65 mm10 Oct 1999 | 182 mm1990 · driest 0 mm in 1963 | 50 |
| November | 27.8°C1 Nov 1984 | -12.8°C23 Nov 2008 | 83 mm9 Nov 1986 | 195 mm1986 · driest 0 mm in 1998 | 51 |
| December | 25.0°C4 Dec 1982 | -27.8°C24 Dec 1989 | 102 mm23 Dec 1990 | 431 mm1991 · driest 10 mm in 1965 | 49 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 23 | 4 | 2 |
| February | 0 | 0 | 22 | 3 | 1 |
| March | 2 | 0 | 15 | 5 | <1 |
| April | 9 | <1 | 7 | 4 | 0 |
| May | 16 | 3 | 1 | 4 | 0 |
| June | 24 | 12 | 0 | 4 | 0 |
| July | 29 | 17 | 0 | 5 | 0 |
| August | 28 | 15 | 0 | 3 | 0 |
| September | 19 | 6 | <1 | 3 | 0 |
| October | 7 | <1 | 7 | 2 | 0 |
| November | <1 | 0 | 16 | 4 | <1 |
| December | 0 | 0 | 21 | 4 | <1 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 2% | 31% | 14% | 35% | 3.5–10.2°C |
| February | 3% | 35% | 14% | 42% | 5.4–11.8°C |
| March | 20% | 32% | 15% | 37% | 11.3–17.9°C |
| April | 41% | 33% | 13% | 40% | 18.2–22.6°C |
| May | 60% | 33% | 14% | 40% | 22.4–27.3°C |
| June | 71% | 29% | 14% | 32% | 26.7–31.0°C |
| July | 69% | 32% | 15% | 36% | 28.3–32.1°C |
| August | 76% | 25% | 10% | 23% | 27.7–31.6°C |
| September | 75% | 22% | 10% | 18% | 24.6–28.2°C |
| October | 49% | 22% | 9% | 21% | 18.5–22.8°C |
| November | 17% | 28% | 12% | 31% | 11.3–17.0°C |
| December | 2% | 31% | 14% | 35% | 5.0–12.4°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