September
September · June · May
United States · 1991–2020
September leads for comfortable weather in Avis: typically 25.1°C by day, 13.5°C at night, with 80 mm of rain. Based on measured 1991–2020 NOAA station history.
September · June · May
August · July · June
October · April · May
The weakest month is January, scoring 5 against September’s 83 — days reach only 5.8°C, 18° 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 | 5.8°C | -3.8°C | 78 mm | 9.4 | 9 h 49 | 5 | Good coverage |
| February | 7.8°C | -2.9°C | 72 mm | 8.5 | 10 h 44 | 5 | Good coverage |
| March | 12.6°C | 0.2°C | 95 mm | 9.7 | 11 h 50 | 21 | Good coverage |
| April | 19.3°C | 5.2°C | 93 mm | 10.3 | 13 h 07 | 52 | Good coverage |
| May | 23.6°C | 10.2°C | 115 mm | 11.7 | 14 h 11 | 71 | Good coverage |
| June | 27.4°C | 15.4°C | 98 mm | 10.7 | 14 h 45 | 73 | Good coverage |
| July | 29.4°C | 17.9°C | 107 mm | 11 | 14 h 32 | 60 | Good coverage |
| August | 28.6°C | 17.3°C | 90 mm | 9.1 | 13 h 37 | 68 | Good coverage |
| September | 25.1°C | 13.5°C | 80 mm | 7.2 | 12 h 23 | 83 | Good coverage |
| October | 19.3°C | 6.6°C | 67 mm | 6.8 | 11 h 09 | 61 | Good coverage |
| November | 12.9°C | 1.3°C | 62 mm | 7.1 | 10 h 05 | 31 | Good coverage |
| December | 6.8°C | -2.3°C | 82 mm | 9.4 | 9 h 34 | 5 | Good coverage |
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 25.0°C31 Jan 2002 | -27.2°C21 Jan 1985 | 69 mm28 Jan 1998 | 177 mm1998 · driest 13 mm in 1983 | 67 |
| February | 25.6°C1 Feb 2002 | -25.0°C5 Feb 1996 | 48 mm24 Feb 1984 | 175 mm2003 · driest 5 mm in 1968 | 67 |
| March | 29.4°C29 Mar 1945 | -17.8°C15 Mar 1993 | 84 mm12 Mar 1963 | 196 mm1955 · driest 24 mm in 1988 | 67 |
| April | 32.2°C24 Apr 2001 | -7.8°C1 Apr 1964 | 54 mm25 Apr 1987 | 197 mm1987 · driest 18 mm in 1950 | 67 |
| May | 33.9°C20 May 1943 | -2.2°C9 May 1947 | 89 mm27 May 1954 | 207 mm1954 · driest 19 mm in 1970 | 67 |
| June | 37.8°C11 Jun 1947 | 2.2°C2 Jun 1966 | 70 mm5 Jun 1992 | 179 mm1979 · driest 19 mm in 1988 | 67 |
| July | 37.8°C15 Jul 1954 | 7.2°C10 Jul 1963 | 71 mm2 Jul 1986 | 264 mm2005 · driest 30 mm in 1987 | 67 |
| August | 39.4°C29 Aug 1948 | 5.0°C30 Aug 1986 | 100 mm20 Aug 1969 | 164 mm1947 · driest 27 mm in 2011 | 65 |
| September | 37.2°C2 Sep 1953 | -0.6°C24 Sep 1989 | 72 mm14 Sep 1966 | 184 mm1966 · driest 8 mm in 2005 | 66 |
| October | 34.4°C1 Oct 1953 | -7.8°C27 Oct 1962 | 59 mm16 Oct 1954 | 163 mm1983 · driest 3 mm in 1963 | 66 |
| November | 28.9°C3 Nov 1946 | -13.3°C26 Nov 1950 | 53 mm10 Nov 1962 | 160 mm2003 · driest 7 mm in 2001 | 66 |
| December | 25.0°C1 Dec 2001 | -22.8°C23 Dec 1989 | 41 mm1 Dec 1996 | 147 mm1991 · driest 6 mm in 1965 | 66 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | <1 | 0 | 23 | 3 | 3 |
| February | <1 | 0 | 21 | 2 | 3 |
| March | <1 | 0 | 16 | 4 | 1 |
| April | 7 | <1 | 4 | 3 | <1 |
| May | 14 | 3 | <1 | 4 | 0 |
| June | 23 | 9 | 0 | 3 | 0 |
| July | 29 | 15 | 0 | 4 | 0 |
| August | 28 | 11 | 0 | 3 | 0 |
| September | 17 | 3 | 0 | 3 | 0 |
| October | 4 | 0 | 2 | 2 | <1 |
| November | <1 | 0 | 14 | 2 | <1 |
| December | <1 | 0 | 22 | 3 | 1 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 1% | 29% | 8% | 31% | 2.2–8.5°C |
| February | 2% | 30% | 9% | 38% | 4.1–10.3°C |
| March | 13% | 31% | 10% | 38% | 9.2–15.7°C |
| April | 35% | 33% | 10% | 43% | 16.4–21.6°C |
| May | 54% | 36% | 11% | 47% | 21.0–26.4°C |
| June | 67% | 32% | 10% | 41% | 25.2–29.4°C |
| July | 67% | 34% | 11% | 45% | 27.7–31.3°C |
| August | 73% | 28% | 10% | 33% | 27.2–30.8°C |
| September | 69% | 25% | 8% | 25% | 23.5–28.0°C |
| October | 45% | 22% | 7% | 22% | 17.7–23.0°C |
| November | 12% | 25% | 7% | 26% | 10.7–16.1°C |
| December | 1% | 27% | 8% | 32% | 3.5–9.7°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