May
May · October · April
United States · 1991–2020
May leads for comfortable weather in Belmont: typically 25.7°C by day, 13.4°C at night, with 90 mm of rain. Based on measured 1991–2020 NOAA station history.
May · October · April
June · August · July
October · April · November
The weakest month is January, scoring 12 against May’s 79 — days reach only 10.1°C, 14° below the 24°C the score treats as ideal, and nights drop to -1.2°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 | -1.2°C | 94 mm | 8.7 | 9 h 55 | 12 | Strong coverage |
| February | 11.7°C | -0.4°C | 82 mm | 7.7 | 10 h 48 | 21 | Strong coverage |
| March | 15.7°C | 3°C | 111 mm | 8.9 | 11 h 51 | 35 | Strong coverage |
| April | 21.5°C | 7.8°C | 93 mm | 8 | 13 h 04 | 66 | Strong coverage |
| May | 25.7°C | 13.4°C | 90 mm | 8.2 | 14 h 05 | 79 | Strong coverage |
| June | 29.9°C | 18.4°C | 126 mm | 8.9 | 14 h 38 | 56 | Strong coverage |
| July | 32.3°C | 20.8°C | 132 mm | 9.3 | 14 h 25 | 43 | Strong coverage |
| August | 31.1°C | 19.8°C | 135 mm | 8.4 | 13 h 33 | 49 | Strong coverage |
| September | 27.9°C | 16.5°C | 136 mm | 7.6 | 12 h 22 | 66 | Strong coverage |
| October | 22.3°C | 10°C | 90 mm | 5.9 | 11 h 12 | 75 | Strong coverage |
| November | 16.5°C | 4.2°C | 88 mm | 6.7 | 10 h 11 | 45 | Strong coverage |
| December | 12°C | 1°C | 90 mm | 8.1 | 9 h 41 | 23 | 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 | 26.7°C31 Jan 2002 | -19.4°C22 Jan 1985 | 76 mm29 Jan 2014 | 188 mm1987 · driest 17 mm in 1981 | 55 |
| February | 28.3°C27 Feb 1977 | -17.8°C10 Feb 1979 | 152 mm26 Feb 2015 | 261 mm2015 · driest 19 mm in 2017 | 55 |
| March | 31.1°C30 Mar 2020 | -12.2°C4 Mar 1980 | 167 mm16 Mar 2016 | 239 mm2016 · driest 16 mm in 2006 | 55 |
| April | 34.4°C28 Apr 1990 | -5.6°C10 Apr 1990 | 109 mm16 Apr 2014 | 231 mm2014 · driest 14 mm in 1985 | 55 |
| May | 36.1°C29 May 2019 | -5.6°C1 May 2006 | 71 mm30 May 1984 | 176 mm1984 · driest 19 mm in 1997 | 53 |
| June | 41.1°C30 Jun 2012 | 1.7°C24 Jun 1992 | 165 mm6 Jun 2001 | 386 mm2013 · driest 3 mm in 1986 | 54 |
| July | 39.4°C7 Jul 1999 | 6.7°C8 Jul 2006 | 166 mm24 Jul 2000 | 310 mm1975 · driest 22 mm in 1983 | 54 |
| August | 40.0°C10 Aug 2007 | 8.3°C29 Aug 1986 | 292 mm25 Aug 2012 | 481 mm2012 · driest 10 mm in 1980 | 54 |
| September | 37.2°C12 Sep 1983 | 0.6°C22 Sep 2004 | 254 mm16 Sep 1999 | 548 mm1999 · driest 11 mm in 1990 | 54 |
| October | 37.8°C4 Oct 2019 | -3.3°C20 Oct 1981 | 173 mm9 Oct 2016 | 242 mm1977 · driest 0 mm in 2000 | 54 |
| November | 29.4°C3 Nov 1974 | -9.4°C23 Nov 2008 | 102 mm7 Nov 1977 | 262 mm1985 · driest 9 mm in 2012 | 53 |
| December | 28.3°C8 Dec 1998 | -15.6°C25 Dec 1983 | 58 mm25 Dec 1986 | 178 mm2013 · driest 19 mm in 1994 | 54 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) |
|---|---|---|---|---|
| January | <1 | 0 | 19 | 3 |
| February | <1 | 0 | 16 | 2 |
| March | 2 | <1 | 9 | 4 |
| April | 10 | 1 | 1 | 3 |
| May | 19 | 7 | <1 | 3 |
| June | 27 | 17 | 0 | 4 |
| July | 30 | 25 | 0 | 4 |
| August | 30 | 21 | 0 | 4 |
| September | 23 | 11 | 0 | 4 |
| October | 10 | 1 | <1 | 3 |
| November | 2 | 0 | 6 | 3 |
| December | <1 | 0 | 15 | 3 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 4% | 28% | 11% | 29% | 6.2–12.7°C |
| February | 8% | 29% | 11% | 35% | 8.1–14.8°C |
| March | 21% | 29% | 12% | 32% | 12.9–17.9°C |
| April | 49% | 26% | 11% | 27% | 19.7–24.0°C |
| May | 66% | 28% | 11% | 33% | 23.5–27.7°C |
| June | 73% | 27% | 11% | 30% | 27.8–31.5°C |
| July | 70% | 30% | 12% | 33% | 30.6–33.8°C |
| August | 74% | 26% | 11% | 27% | 29.1–33.1°C |
| September | 75% | 24% | 11% | 24% | 26.1–29.9°C |
| October | 57% | 19% | 8% | 19% | 20.0–24.0°C |
| November | 25% | 22% | 10% | 21% | 13.7–19.4°C |
| December | 6% | 27% | 10% | 31% | 8.7–14.5°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