April
April · October · May
United States · 1991–2020
April leads for comfortable weather in Mettler: typically 23.8°C by day, 7.4°C at night, with 28 mm of rain. Based on measured 1991–2020 NOAA station history.
April · October · May
June · September · May
November · March · April
The weakest month is January, scoring 44 against April’s 85 — days reach only 15.5°C, 8° below the 24°C the score treats as ideal, and nights drop to 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 | 15.5°C | 2°C | 49 mm | 5.4 | 10 h 02 | 44 | Strong coverage |
| February | 17.5°C | 3.7°C | 62 mm | 5.9 | 10 h 52 | 52 | Strong coverage |
| March | 20.6°C | 5.5°C | 55 mm | 5.7 | 11 h 52 | 66 | Strong coverage |
| April | 23.8°C | 7.4°C | 28 mm | 3.4 | 13 h 01 | 85 | Strong coverage |
| May | 28.5°C | 11.5°C | 15 mm | 2.2 | 13 h 59 | 79 | Strong coverage |
| June | 33.2°C | 15.8°C | 2 mm | 0.4 | 14 h 30 | 68 | Strong coverage |
| July | 36.4°C | 19°C | 2 mm | 0.2 | 14 h 18 | 52 | Strong coverage |
| August | 36°C | 18.2°C | 1 mm | 0.1 | 13 h 28 | 55 | Strong coverage |
| September | 33.4°C | 16.2°C | 2 mm | 0.3 | 12 h 21 | 67 | Strong coverage |
| October | 27.2°C | 10.9°C | 14 mm | 1.4 | 11 h 14 | 82 | Strong coverage |
| November | 19.8°C | 5.2°C | 29 mm | 3.6 | 10 h 16 | 68 | Strong coverage |
| December | 15.5°C | 1.7°C | 47 mm | 5.3 | 9 h 48 | 44 | Strong coverage |
What has changed
Each bar compares the 2011–2025 daytime average for that month against the same month in 1961–1990, measured at the same station. Months where the older record is too thin to compare are left blank.
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 27.8°C28 Jan 1986 | -14.4°C13 Jan 2007 | 56 mm17 Jan 1988 | 119 mm1995 · driest 0 mm in 1948 | 110 |
| February | 30.0°C5 Feb 2015 | -10.0°C5 Feb 2008 | 64 mm27 Feb 1915 | 201 mm1998 · driest 1 mm in 1972 | 114 |
| March | 32.8°C21 Mar 2026 | -8.3°C1 Mar 2007 | 74 mm21 Mar 2011 | 200 mm1991 · driest 0 mm in 1972 | 117 |
| April | 37.8°C22 Apr 1987 | -8.9°C21 Apr 2008 | 46 mm6 Apr 1943 | 137 mm1967 · driest 0 mm in 2007 | 117 |
| May | 42.8°C30 May 1984 | -4.4°C1 May 2008 | 30 mm20 May 2019 | 90 mm2019 · driest 0 mm in 1999 | 112 |
| June | 45.6°C15 Jun 1961 | -0.6°C9 Jun 2007 | 21 mm10 Jun 1957 | 21 mm1957 · driest 0 mm in 1936 | 111 |
| July | 45.0°C5 Jul 2007 | 6.1°C12 Jul 2007 | 29 mm23 Jul 1974 | 29 mm1974 · driest 0 mm in 1985 | 111 |
| August | 43.3°C14 Aug 1933 | 5.0°C20 Aug 2008 | 74 mm21 Aug 2023 | 74 mm2023 · driest 0 mm in 1936 | 112 |
| September | 45.0°C3 Sep 1955 | 1.1°C22 Sep 2008 | 34 mm26 Sep 1982 | 38 mm1976 · driest 0 mm in 1957 | 113 |
| October | 38.3°C10 Oct 1991 | -3.3°C8 Oct 2007 | 48 mm26 Oct 1940 | 59 mm1936 · driest 0 mm in 1928 | 115 |
| November | 33.9°C1 Nov 1966 | -9.4°C30 Nov 2006 | 47 mm4 Nov 1987 | 138 mm1987 · driest 0 mm in 2021 | 112 |
| December | 27.2°C13 Dec 2004 | -11.7°C22 Dec 2007 | 48 mm24 Dec 2025 | 116 mm1931 · driest 0 mm in 1930 | 115 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) |
|---|---|---|---|---|
| January | <1 | 0 | 9 | 2 |
| February | 1 | 0 | 5 | 2 |
| March | 5 | <1 | 3 | 2 |
| April | 11 | 4 | 2 | <1 |
| May | 21 | 11 | <1 | <1 |
| June | 26 | 21 | <1 | 0 |
| July | 27 | 27 | 0 | 0 |
| August | 28 | 27 | 0 | 0 |
| September | 26 | 22 | 0 | <1 |
| October | 19 | 8 | <1 | <1 |
| November | 3 | <1 | 4 | 1 |
| December | <1 | 0 | 8 | 2 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 10% | 19% | 6% | 19% | 11.4–17.0°C |
| February | 23% | 20% | 7% | 19% | 14.3–19.2°C |
| March | 46% | 20% | 7% | 18% | 16.6–22.4°C |
| April | 70% | 13% | 5% | 10% | 20.5–25.8°C |
| May | 89% | 7% | 2% | 3% | 24.3–29.9°C |
| June | 99% | 1% | <1% | <1% | 29.5–34.9°C |
| July | 100% | <1% | <1% | <1% | 33.9–37.9°C |
| August | 99% | <1% | <1% | 0% | 32.3–36.8°C |
| September | 98% | 2% | <1% | 1% | 29.1–34.1°C |
| October | 86% | 6% | 2% | 3% | 23.1–28.9°C |
| November | 41% | 12% | 5% | 9% | 16.2–21.4°C |
| December | 11% | 17% | 6% | 13% | 11.9–17.2°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