May
May · October · September
United States · 1991–2020
May leads for comfortable weather in Copperfield (historical): typically 25.1°C by day, 8.4°C at night, with 16 mm of rain. Based on measured 1991–2020 NOAA station history.
May · October · September
June · September · August
April · October · May
The weakest month is December, scoring 15 against May’s 85 — days reach only 8.5°C, 15° below the 24°C the score treats as ideal, and nights drop to -3.7°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 | 9.4°C | -3.6°C | 9 mm | 2.2 | 9 h 45 | 18 | Strong coverage |
| February | 12.2°C | -1.6°C | 9 mm | 1.8 | 10 h 41 | 31 | Strong coverage |
| March | 17.1°C | 1.5°C | 9 mm | 1.7 | 11 h 50 | 53 | Strong coverage |
| April | 19.7°C | 3.9°C | 9 mm | 1.7 | 13 h 09 | 66 | Strong coverage |
| May | 25.1°C | 8.4°C | 16 mm | 2.2 | 14 h 15 | 85 | Strong coverage |
| June | 30.8°C | 13.2°C | 7 mm | 1.2 | 14 h 51 | 74 | Strong coverage |
| July | 35.4°C | 17.3°C | 8 mm | 1.7 | 14 h 37 | 58 | Strong coverage |
| August | 34.5°C | 16.3°C | 5 mm | 0.9 | 13 h 40 | 63 | Strong coverage |
| September | 29.7°C | 11.8°C | 3 mm | 0.6 | 12 h 23 | 76 | Strong coverage |
| October | 22.2°C | 5.3°C | 6 mm | 1.2 | 11 h 07 | 77 | Strong coverage |
| November | 14.3°C | -0.3°C | 8 mm | 1.4 | 10 h 01 | 40 | Good coverage |
| December | 8.5°C | -3.7°C | 7 mm | 1.7 | 9 h 29 | 15 | Strong coverage |
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 22.8°C31 Jan 2003 | -19.4°C12 Jan 1963 | 29 mm4 Jan 2008 | 63 mm2017 · driest 0 mm in 2022 | 37 |
| February | 25.0°C24 Feb 2026 | -16.7°C27 Feb 1962 | 27 mm7 Feb 2017 | 57 mm1962 · driest 0 mm in 2007 | 38 |
| March | 31.1°C20 Mar 2026 | -10.0°C21 Mar 1955 | 28 mm13 Mar 1996 | 44 mm1996 · driest 0 mm in 2009 | 38 |
| April | 34.4°C30 Apr 2021 | -8.9°C1 Apr 1955 | 19 mm1 Apr 1998 | 41 mm2007 · driest 0 mm in 1962 | 37 |
| May | 38.3°C31 May 2025 | -3.9°C3 May 1964 | 34 mm7 May 2017 | 55 mm1962 · driest 0 mm in 1999 | 37 |
| June | 40.6°C28 Jun 2021 | 1.1°C6 Jun 1993 | 29 mm3 Jun 1998 | 43 mm1963 · driest 0 mm in 2017 | 38 |
| July | 43.3°C16 Jul 2023 | 6.7°C1 Jul 1997 | 19 mm2 Jul 2025 | 29 mm2015 · driest 0 mm in 2020 | 36 |
| August | 40.6°C12 Aug 2025 | 6.1°C25 Aug 2024 | 21 mm23 Aug 2009 | 30 mm2023 · driest 0 mm in 2021 | 39 |
| September | 40.6°C6 Sep 2022 | 2.2°C21 Sep 2004 | 29 mm9 Sep 1961 | 39 mm2023 · driest 0 mm in 2010 | 37 |
| October | 33.9°C5 Oct 1964 | -9.4°C30 Oct 2019 | 18 mm1 Oct 2023 | 32 mm2010 · driest 0 mm in 1997 | 37 |
| November | 26.7°C1 Nov 2005 | -14.4°C28 Nov 2004 | 14 mm12 Nov 1993 | 38 mm2004 · driest 0 mm in 2012 | 35 |
| December | 24.4°C19 Dec 2025 | -18.9°C23 Dec 1998 | 18 mm23 Dec 2021 | 45 mm2021 · driest 0 mm in 1954 | 36 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) |
|---|---|---|---|---|
| January | 0 | 0 | 23 | <1 |
| February | 0 | 0 | 18 | <1 |
| March | 1 | 0 | 11 | <1 |
| April | 5 | <1 | 5 | <1 |
| May | 15 | 6 | <1 | <1 |
| June | 23 | 18 | 0 | <1 |
| July | 28 | 27 | 0 | <1 |
| August | 28 | 27 | 0 | <1 |
| September | 23 | 15 | 0 | <1 |
| October | 9 | 2 | 3 | <1 |
| November | <1 | 0 | 14 | <1 |
| December | 0 | 0 | 23 | <1 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | <1% | 8% | <1% | 4% | 5.5–11.9°C |
| February | 7% | 8% | <1% | 4% | 9.3–15.1°C |
| March | 31% | 6% | <1% | 2% | 14.1–19.6°C |
| April | 54% | 6% | <1% | 2% | 17.3–21.5°C |
| May | 78% | 8% | 1% | 5% | 21.7–27.6°C |
| June | 93% | 5% | <1% | 3% | 27.5–33.6°C |
| July | 95% | 5% | <1% | 1% | 34.0–37.3°C |
| August | 96% | 4% | <1% | 2% | 33.3–35.7°C |
| September | 95% | 3% | <1% | 1% | 27.8–31.1°C |
| October | 71% | 4% | <1% | <1% | 19.8–25.1°C |
| November | 18% | 5% | <1% | 2% | 11.5–16.5°C |
| December | 2% | 5% | <1% | 2% | 6.8–11.9°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