June
June · July · August
United States · 1991–2020
June leads for comfortable weather in Old Mission: typically 24°C by day, 11°C at night, with 73 mm of rain. Based on measured 1991–2020 NOAA station history.
June · July · August
July · August · June
September · June · May
The weakest month is January, scoring 5 against June’s 84 — days reach only -1.7°C, 26° 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 | Sea | Daylight | Comfort | Coverage |
|---|---|---|---|---|---|---|---|---|
| January | -1.7°C | -8.8°C | 36 mm | 9 | 3.4°C | 9 h 08 | 5 | Good coverage |
| February | -1°C | -9.4°C | 22 mm | 5.9 | 2.1°C | 10 h 20 | 5 | Good coverage |
| March | 4.5°C | -6°C | 34 mm | 5.6 | 1.6°C | 11 h 46 | 5 | Strong coverage |
| April | 11.1°C | -0.6°C | 74 mm | 8.5 | 2.5°C | 13 h 25 | 19 | Strong coverage |
| May | 18.5°C | 5.1°C | 78 mm | 9.8 | 4.5°C | 14 h 49 | 52 | Strong coverage |
| June | 24°C | 11°C | 73 mm | 6.9 | 10.2°C | 15 h 35 | 84 | Strong coverage |
| July | 26.4°C | 14.2°C | 70 mm | 7.3 | 17.5°C | 15 h 17 | 82 | Strong coverage |
| August | 25.6°C | 14.1°C | 82 mm | 7.6 | 20.1°C | 14 h 04 | 82 | Strong coverage |
| September | 21.8°C | 10.4°C | 89 mm | 9.1 | 18.2°C | 12 h 28 | 71 | Strong coverage |
| October | 14.3°C | 4.7°C | 91 mm | 11.2 | 13.2°C | 10 h 53 | 34 | Strong coverage |
| November | 7.7°C | -0.1°C | 51 mm | 8.2 | 8.8°C | 9 h 29 | 12 | Good coverage |
| December | 1.6°C | -4.9°C | 40 mm | 9 | 5.7°C | 8 h 47 | 5 | Good coverage |
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 12.2°C19 Jan 1996 | -25.6°C31 Jan 1994 | 28 mm5 Jan 1997 | 79 mm1990 · driest 1 mm in 2010 | 44 |
| February | 20.6°C28 Feb 2024 | -28.9°C10 Feb 1994 | 25 mm28 Feb 1981 | 71 mm1985 · driest 3 mm in 1987 | 45 |
| March | 28.9°C22 Mar 2012 | -26.7°C3 Mar 2014 | 41 mm28 Mar 1991 | 94 mm1991 · driest 2 mm in 1999 | 46 |
| April | 29.4°C23 Apr 1980 | -13.3°C6 Apr 1996 | 48 mm20 Apr 2012 | 121 mm1981 · driest 6 mm in 1997 | 47 |
| May | 33.3°C13 May 2022 | -5.0°C2 May 1990 | 52 mm30 May 2002 | 168 mm1983 · driest 8 mm in 2021 | 45 |
| June | 35.0°C28 Jun 2005 | -0.6°C4 Jun 1982 | 76 mm27 Jun 1986 | 204 mm1986 · driest 3 mm in 2013 | 46 |
| July | 36.1°C9 Jul 1988 | 2.2°C2 Jul 2001 | 86 mm6 Jul 1999 | 181 mm1999 · driest 11 mm in 2018 | 47 |
| August | 37.2°C1 Aug 2006 | 1.1°C29 Aug 1982 | 79 mm2 Aug 1987 | 187 mm1987 · driest 1 mm in 2020 | 46 |
| September | 33.3°C6 Sep 2023 | -2.8°C28 Sep 2000 | 125 mm7 Sep 2023 | 247 mm1986 · driest 3 mm in 2004 | 45 |
| October | 30.6°C9 Oct 2007 | -6.1°C28 Oct 1997 | 119 mm25 Oct 1991 | 226 mm1991 · driest 11 mm in 2010 | 47 |
| November | 24.4°C10 Nov 2020 | -10.6°C13 Nov 1986 | 39 mm4 Nov 2003 | 117 mm1992 · driest 4 mm in 2022 | 46 |
| December | 18.3°C16 Dec 2021 | -20.6°C21 Dec 1983 | 31 mm8 Dec 2004 | 82 mm1982 · driest 3 mm in 2007 | 46 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) |
|---|---|---|---|---|
| January | 0 | 0 | 23 | <1 |
| February | 0 | 0 | 22 | <1 |
| March | <1 | 0 | 21 | <1 |
| April | <1 | 0 | 15 | 2 |
| May | 4 | <1 | 4 | 2 |
| June | 11 | 3 | <1 | 2 |
| July | 17 | 5 | 0 | 2 |
| August | 15 | 3 | 0 | 2 |
| September | 7 | 1 | <1 | 2 |
| October | 1 | 0 | 4 | 2 |
| November | 0 | 0 | 12 | 1 |
| December | 0 | 0 | 21 | <1 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 0% | 29% | 3% | 28% | -4.6–1.5°C |
| February | 0% | 22% | 1% | 17% | -3.8–2.4°C |
| March | 1% | 19% | 4% | 15% | 1.4–8.2°C |
| April | 7% | 29% | 7% | 28% | 8.4–14.1°C |
| May | 30% | 29% | 8% | 28% | 15.6–21.2°C |
| June | 58% | 26% | 9% | 26% | 21.3–25.7°C |
| July | 73% | 23% | 7% | 19% | 24.6–28.6°C |
| August | 69% | 26% | 10% | 26% | 23.4–27.2°C |
| September | 45% | 31% | 10% | 43% | 19.4–24.1°C |
| October | 12% | 37% | 9% | 45% | 11.3–16.4°C |
| November | 1% | 31% | 6% | 35% | 4.0–11.4°C |
| December | 0% | 30% | 3% | 35% | -2.0–4.3°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