May
May · September · October
United States · 1991–2020
May leads for comfortable weather in Shumway: typically 25.8°C by day, 5.4°C at night, with 10 mm of rain. Based on measured 1991–2020 NOAA station history.
May · September · October
August · July · September
April · October · May
The weakest month is December, scoring 13 against May’s 77 — days reach only 9.4°C, 15° below the 24°C the score treats as ideal, and nights drop to -6.2°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 | 10.1°C | -6.2°C | 20 mm | 3.2 | 10 h 05 | 16 | Strong coverage |
| February | 13.1°C | -4.3°C | 16 mm | 3.5 | 10 h 53 | 29 | Strong coverage |
| March | 16.9°C | -1.8°C | 19 mm | 3.2 | 11 h 52 | 46 | Strong coverage |
| April | 20.6°C | 1.2°C | 10 mm | 1.9 | 13 h | 64 | Strong coverage |
| May | 25.8°C | 5.4°C | 10 mm | 1.9 | 13 h 56 | 77 | Strong coverage |
| June | 31.1°C | 9.5°C | 6 mm | 1.8 | 14 h 26 | 67 | Strong coverage |
| July | 32.4°C | 14.5°C | 56 mm | 7 | 14 h 15 | 65 | Strong coverage |
| August | 31°C | 13.9°C | 53 mm | 7.4 | 13 h 26 | 68 | Strong coverage |
| September | 28.3°C | 9.7°C | 33 mm | 4.7 | 12 h 21 | 75 | Strong coverage |
| October | 22.5°C | 2.9°C | 23 mm | 3.2 | 11 h 16 | 73 | Strong coverage |
| November | 15.4°C | -2.8°C | 18 mm | 3.1 | 10 h 19 | 40 | Strong coverage |
| December | 9.4°C | -6.2°C | 24 mm | 3.4 | 9 h 52 | 13 | Strong coverage |
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 26.1°C15 Jan 1943 | -34.4°C23 Jan 1937 | 44 mm11 Jan 1941 | 84 mm2010 · driest 0 mm in 1928 | 111 |
| February | 25.6°C23 Feb 1904 | -27.2°C4 Feb 1956 | 38 mm16 Feb 1926 | 71 mm1905 · driest 0 mm in 2006 | 112 |
| March | 28.9°C20 Mar 2004 | -19.4°C13 Mar 2006 | 44 mm26 Mar 1989 | 76 mm1926 · driest 0 mm in 1933 | 111 |
| April | 33.3°C30 Apr 1943 | -16.1°C3 Apr 1969 | 25 mm24 Apr 1942 | 77 mm1926 · driest 0 mm in 1944 | 113 |
| May | 36.7°C28 May 2000 | -8.3°C6 May 1968 | 36 mm7 May 1969 | 93 mm1992 · driest 0 mm in 1996 | 108 |
| June | 38.9°C29 Jun 1924 | -6.7°C11 Jun 1898 | 32 mm13 Jun 1955 | 59 mm1927 · driest 0 mm in 1929 | 111 |
| July | 40.0°C13 Jul 1942 | -2.8°C1 Jul 1936 | 83 mm23 Jul 2008 | 167 mm1921 · driest 6 mm in 1902 | 110 |
| August | 38.9°C2 Aug 1914 | 1.1°C29 Aug 1920 | 70 mm28 Aug 1951 | 161 mm1930 · driest 3 mm in 1924 | 111 |
| September | 36.7°C1 Sep 1918 | -5.6°C22 Sep 1924 | 66 mm17 Sep 1923 | 133 mm1984 · driest 0 mm in 1953 | 109 |
| October | 32.2°C1 Oct 2003 | -11.7°C31 Oct 1919 | 68 mm30 Oct 1959 | 135 mm1959 · driest 0 mm in 1937 | 111 |
| November | 32.2°C4 Nov 1916 | -27.2°C24 Nov 1931 | 37 mm24 Nov 1978 | 99 mm1978 · driest 0 mm in 1927 | 110 |
| December | 23.9°C4 Dec 1958 | -31.1°C22 Dec 1968 | 38 mm19 Dec 1967 | 106 mm1967 · driest 0 mm in 1929 | 112 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 27 | <1 | 1 |
| February | 0 | 0 | 24 | <1 | 1 |
| March | 1 | 0 | 22 | <1 | <1 |
| April | 6 | <1 | 13 | <1 | <1 |
| May | 19 | 5 | 3 | <1 | 0 |
| June | 29 | 21 | <1 | <1 | 0 |
| July | 30 | 25 | 0 | 2 | 0 |
| August | 30 | 21 | 0 | 2 | 0 |
| September | 26 | 11 | <1 | 1 | 0 |
| October | 11 | <1 | 8 | <1 | <1 |
| November | <1 | 0 | 23 | <1 | <1 |
| December | 0 | 0 | 28 | <1 | 2 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 1% | 10% | 2% | 6% | 5.2–12.5°C |
| February | 7% | 12% | 2% | 8% | 9.4–15.7°C |
| March | 24% | 12% | 2% | 8% | 13.2–18.8°C |
| April | 59% | 9% | 1% | 4% | 17.5–23.4°C |
| May | 86% | 6% | 1% | 4% | 22.8–27.6°C |
| June | 93% | 7% | 1% | 5% | 28.9–33.0°C |
| July | 76% | 23% | 5% | 28% | 30.6–34.0°C |
| August | 75% | 26% | 6% | 27% | 29.2–32.6°C |
| September | 85% | 15% | 4% | 13% | 26.1–29.8°C |
| October | 70% | 10% | 3% | 8% | 19.4–25.0°C |
| November | 21% | 9% | 2% | 5% | 12.3–18.5°C |
| December | 2% | 10% | 2% | 5% | 6.1–12.8°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