May
May · September · June
United States · 1991–2020
May leads for comfortable weather in Langleyville: typically 23.7°C by day, 12.1°C at night, with 112 mm of rain. Based on measured 1991–2020 NOAA station history.
May · September · June
July · August · June
October · April · May
The weakest month is January, scoring 5 against May’s 77 — days reach only 1.6°C, 22° 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 | 1.6°C | -7.5°C | 55 mm | 6.1 | 9 h 39 | 5 | Strong coverage |
| February | 4.5°C | -5.2°C | 51 mm | 5.4 | 10 h 38 | 5 | Strong coverage |
| March | 10.7°C | -0.3°C | 63 mm | 6.9 | 11 h 49 | 21 | Good coverage |
| April | 18°C | 5.5°C | 104 mm | 9.1 | 13 h 11 | 48 | Strong coverage |
| May | 23.7°C | 12.1°C | 112 mm | 9.7 | 14 h 20 | 77 | Strong coverage |
| June | 28.1°C | 16.8°C | 100 mm | 7.9 | 14 h 57 | 70 | Good coverage |
| July | 29.9°C | 18.2°C | 75 mm | 6.4 | 14 h 42 | 66 | Good coverage |
| August | 29.4°C | 17.1°C | 82 mm | 6 | 13 h 43 | 69 | Strong coverage |
| September | 26.4°C | 12.4°C | 88 mm | 5.9 | 12 h 24 | 77 | Good coverage |
| October | 19.7°C | 6°C | 80 mm | 7.4 | 11 h 05 | 59 | Strong coverage |
| November | 10.8°C | 0.1°C | 82 mm | 7.3 | 9 h 57 | 19 | Good coverage |
| December | 3.9°C | -5°C | 53 mm | 6.1 | 9 h 23 | 5 | Good coverage |
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 21.1°C30 Jan 2013 | -30.6°C19 Jan 1994 | 64 mm11 Jan 2020 | 174 mm2005 · driest 0 mm in 1986 | 41 |
| February | 25.6°C28 Feb 2024 | -27.8°C3 Feb 1996 | 55 mm27 Feb 1997 | 134 mm2018 · driest 7 mm in 2025 | 41 |
| March | 34.4°C27 Mar 2026 | -19.4°C2 Mar 1980 | 46 mm5 Mar 2004 | 136 mm2026 · driest 17 mm in 2024 | 39 |
| April | 33.3°C30 Apr 1987 | -9.4°C7 Apr 1982 | 78 mm2 Apr 2024 | 251 mm1994 · driest 23 mm in 1986 | 40 |
| May | 36.1°C20 May 2024 | -1.1°C20 May 1981 | 108 mm8 May 2023 | 300 mm2002 · driest 19 mm in 1992 | 41 |
| June | 38.9°C26 Jun 1988 | -1.1°C3 Jun 2003 | 62 mm6 Jun 1986 | 247 mm2011 · driest 20 mm in 1988 | 40 |
| July | 40.0°C7 Jul 2012 | 8.9°C29 Jul 2013 | 105 mm20 Jul 1982 | 233 mm1981 · driest 13 mm in 2012 | 40 |
| August | 40.0°C17 Aug 1988 | 5.0°C29 Aug 1986 | 110 mm3 Aug 2012 | 251 mm1981 · driest 10 mm in 2013 | 41 |
| September | 38.3°C2 Sep 2011 | -1.7°C23 Sep 1983 | 120 mm1 Sep 2003 | 280 mm2008 · driest 2 mm in 2004 | 39 |
| October | 34.4°C1 Oct 2019 | -6.7°C19 Oct 1992 | 104 mm2 Oct 2014 | 262 mm2009 · driest 7 mm in 2008 | 40 |
| November | 27.2°C2 Nov 2000 | -17.8°C8 Nov 1991 | 97 mm19 Nov 1985 | 269 mm1985 · driest 15 mm in 2023 | 41 |
| December | 22.2°C29 Dec 2025 | -29.4°C22 Dec 1989 | 62 mm1 Dec 2006 | 188 mm1990 · driest 16 mm in 1996 | 38 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 27 | 2 | 2 |
| February | 0 | 0 | 23 | 2 | 2 |
| March | 1 | 0 | 18 | 2 | 1 |
| April | 4 | <1 | 4 | 4 | <1 |
| May | 14 | 4 | 0 | 4 | 0 |
| June | 24 | 11 | 0 | 4 | 0 |
| July | 29 | 16 | 0 | 3 | 0 |
| August | 29 | 15 | 0 | 3 | 0 |
| September | 20 | 8 | <1 | 3 | 0 |
| October | 7 | 2 | 4 | 3 | <1 |
| November | <1 | 0 | 16 | 3 | <1 |
| December | 0 | 0 | 26 | 2 | 2 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | <1% | 19% | 6% | 16% | -1.3–5.6°C |
| February | <1% | 20% | 6% | 19% | 0.2–8.2°C |
| March | 10% | 25% | 8% | 28% | 7.4–14.9°C |
| April | 29% | 30% | 12% | 36% | 15.3–21.3°C |
| May | 57% | 29% | 12% | 33% | 20.7–26.7°C |
| June | 73% | 26% | 11% | 31% | 26.7–30.3°C |
| July | 78% | 22% | 10% | 19% | 28.5–32.3°C |
| August | 80% | 20% | 9% | 18% | 27.8–31.9°C |
| September | 75% | 18% | 8% | 16% | 24.8–29.2°C |
| October | 40% | 23% | 8% | 26% | 17.3–21.8°C |
| November | 9% | 24% | 9% | 24% | 7.6–14.1°C |
| December | <1% | 21% | 7% | 19% | 0.0–7.3°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