May
May · September · June
United States · 1991–2020
May leads for comfortable weather in Walden: typically 24.5°C by day, 12.2°C at night, with 131 mm of rain. Based on measured 1991–2020 NOAA station history.
May · September · June
August · July · June
October · April · May
The weakest month is January, scoring 5 against May’s 75 — days reach only 7.4°C, 17° 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 | 7.4°C | -2.4°C | 132 mm | 7.3 | 10 h 02 | 5 | Good coverage |
| February | 9.3°C | -0.8°C | 128 mm | 8.5 | 10 h 51 | 5 | Good coverage |
| March | 14.6°C | 3.3°C | 143 mm | 9.3 | 11 h 52 | 27 | Good coverage |
| April | 20.2°C | 7.7°C | 154 mm | 8.4 | 13 h 01 | 53 | Good coverage |
| May | 24.5°C | 12.2°C | 131 mm | 8.2 | 13 h 59 | 75 | Good coverage |
| June | 28.2°C | 16°C | 109 mm | 8 | 14 h 31 | 70 | Good coverage |
| July | 29.7°C | 17.9°C | 118 mm | 8.9 | 14 h 18 | 59 | Good coverage |
| August | 29.5°C | 17.6°C | 100 mm | 7.6 | 13 h 29 | 64 | Good coverage |
| September | 26.1°C | 14.2°C | 138 mm | 5.9 | 12 h 21 | 75 | Good coverage |
| October | 20.2°C | 8.1°C | 94 mm | 5.6 | 11 h 14 | 64 | Good coverage |
| November | 14.1°C | 3.2°C | 128 mm | 7.1 | 10 h 16 | 30 | Good coverage |
| December | 8.1°C | -1.1°C | 162 mm | 8.2 | 9 h 48 | 5 | Good coverage |
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 21.1°C29 Jan 1999 | -20.0°C24 Jan 2003 | 91 mm5 Jan 2020 | 252 mm2020 · driest 25 mm in 2025 | 25 |
| February | 26.1°C23 Feb 2023 | -18.9°C19 Feb 2015 | 102 mm16 Feb 2003 | 339 mm2003 · driest 25 mm in 2024 | 26 |
| March | 30.0°C28 Mar 2025 | -13.3°C4 Mar 2002 | 86 mm9 Mar 2011 | 283 mm2011 · driest 44 mm in 2007 | 27 |
| April | 32.2°C19 Apr 2025 | -7.2°C8 Apr 2007 | 127 mm22 Apr 2017 | 273 mm2011 · driest 23 mm in 1999 | 27 |
| May | 33.9°C26 May 2019 | -2.8°C4 May 2004 | 154 mm6 May 2003 | 496 mm2003 · driest 17 mm in 2007 | 27 |
| June | 37.8°C30 Jun 2012 | 6.7°C7 Jun 1998 | 89 mm5 Jun 1998 | 199 mm1998 · driest 6 mm in 2024 | 26 |
| July | 38.9°C8 Jul 2024 | 10.0°C15 Jul 2001 | 85 mm13 Jul 2012 | 272 mm2012 · driest 29 mm in 2024 | 26 |
| August | 37.8°C5 Aug 2010 | 8.9°C21 Aug 2001 | 258 mm27 Aug 2008 | 356 mm2008 · driest 0 mm in 2024 | 23 |
| September | 35.6°C10 Sep 2019 | -5.0°C26 Sep 2001 | 279 mm17 Sep 2004 | 360 mm2004 · driest 3 mm in 2019 | 24 |
| October | 35.0°C1 Oct 2019 | -6.1°C28 Oct 2001 | 159 mm8 Oct 2017 | 240 mm2017 · driest 0 mm in 1998 | 24 |
| November | 26.7°C1 Nov 1998 | -10.6°C21 Nov 2008 | 165 mm28 Nov 2011 | 311 mm2011 · driest 0 mm in 1998 | 24 |
| December | 22.8°C11 Dec 2007 | -16.1°C23 Dec 2022 | 102 mm7 Dec 2004 | 324 mm2004 · driest 22 mm in 2010 | 24 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 19 | 4 | <1 |
| February | 0 | 0 | 16 | 4 | 2 |
| March | 1 | 0 | 10 | 5 | <1 |
| April | 6 | <1 | 2 | 4 | <1 |
| May | 16 | 3 | <1 | 4 | 0 |
| June | 26 | 9 | 0 | 4 | 0 |
| July | 28 | 15 | 0 | 4 | 0 |
| August | 29 | 15 | 0 | 3 | 0 |
| September | 19 | 6 | <1 | 3 | 0 |
| October | 5 | <1 | 2 | 3 | 0 |
| November | <1 | 0 | 9 | 4 | 0 |
| December | 0 | 0 | 18 | 5 | <1 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | <1% | 23% | 12% | 24% | 5.0–10.7°C |
| February | 3% | 30% | 14% | 35% | 7.1–12.6°C |
| March | 19% | 28% | 15% | 31% | 12.1–18.4°C |
| April | 45% | 27% | 14% | 28% | 18.0–22.6°C |
| May | 66% | 27% | 12% | 33% | 22.2–27.7°C |
| June | 73% | 27% | 11% | 31% | 26.7–31.3°C |
| July | 71% | 29% | 13% | 33% | 27.8–32.7°C |
| August | 75% | 25% | 10% | 27% | 27.7–31.9°C |
| September | 77% | 20% | 11% | 16% | 24.1–28.3°C |
| October | 52% | 19% | 9% | 21% | 17.5–22.2°C |
| November | 13% | 22% | 12% | 26% | 11.7–16.3°C |
| December | 2% | 27% | 15% | 29% | 6.5–11.4°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