June
June · August · July
Canada · 1991–2020
June leads for comfortable weather in Bethesda: typically 24.1°C by day, 13.1°C at night, with 84 mm of rain. Based on measured 1991–2020 NOAA station history.
June · August · July
July · August · June
May · September · June
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 | -10.4°C | 86 mm | 12.4 | 2.9°C | 9 h 13 | 5 | Strong coverage |
| February | -0.6°C | -9.5°C | 66 mm | 10 | 1.4°C | 10 h 23 | 5 | Strong coverage |
| March | 4.4°C | -4.6°C | 62 mm | 9.1 | 1.3°C | 11 h 47 | 5 | Strong coverage |
| April | 11.8°C | 1.7°C | 87 mm | 10 | 3.1°C | 13 h 23 | 22 | Strong coverage |
| May | 19.2°C | 7.9°C | 77 mm | 9.6 | 6.9°C | 14 h 44 | 60 | Strong coverage |
| June | 24.1°C | 13.1°C | 84 mm | 9.5 | 14.3°C | 15 h 29 | 84 | Strong coverage |
| July | 26.9°C | 15.9°C | 82 mm | 8.8 | 20.3°C | 15 h 11 | 77 | Strong coverage |
| August | 26.2°C | 15.4°C | 75 mm | 7.9 | 22.0°C | 14 h 01 | 82 | Strong coverage |
| September | 21.9°C | 11.3°C | 91 mm | 8.6 | 19.7°C | 12 h 27 | 74 | Strong coverage |
| October | 14.5°C | 5.5°C | 92 mm | 11.4 | 14.5°C | 10 h 55 | 36 | Strong coverage |
| November | 7.8°C | -0.1°C | 92 mm | 10.9 | 9.8°C | 9 h 34 | 5 | Strong coverage |
| December | 1.5°C | -5.9°C | 82 mm | 11.6 | 6.0°C | 8 h 53 | 5 | Strong coverage |
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 15.2°C8 Jan 2008 | -33.0°C16 Jan 1994 | 50 mm24 Jan 2010 | 137 mm1998 · driest 43 mm in 1989 | 32 |
| February | 16.0°C23 Feb 2017 | -30.5°C14 Feb 2016 | 42 mm24 Feb 2016 | 129 mm2008 · driest 22 mm in 1999 | 32 |
| March | 24.0°C28 Mar 1998 | -25.0°C3 Mar 2003 | 57 mm5 Mar 2011 | 123 mm2011 · driest 22 mm in 2005 | 32 |
| April | 29.5°C28 Apr 1990 | -11.0°C5 Apr 1995 | 54 mm2 Apr 2005 | 150 mm2011 · driest 15 mm in 2001 | 32 |
| May | 33.0°C26 May 2010 | -2.5°C14 May 2013 | 55 mm13 May 2002 | 157 mm2017 · driest 18 mm in 2005 | 32 |
| June | 35.5°C18 Jun 1994 | 2.5°C6 Jun 2007 | 49 mm24 Jun 1994 | 175 mm1998 · driest 6 mm in 1995 | 33 |
| July | 38.0°C8 Jul 1988 | 7.0°C2 Jul 2001 | 99 mm3 Jul 1999 | 173 mm1999 · driest 13 mm in 1989 | 33 |
| August | 36.5°C3 Aug 1988 | 5.0°C29 Aug 1986 | 60 mm28 Aug 1992 | 138 mm1986 · driest 18 mm in 2012 | 33 |
| September | 34.0°C24 Sep 2017 | -1.0°C29 Sep 2000 | 73 mm8 Sep 2004 | 197 mm1996 · driest 33 mm in 2014 | 32 |
| October | 27.0°C8 Oct 2007 | -6.5°C20 Oct 1992 | 59 mm11 Oct 2006 | 217 mm2006 · driest 30 mm in 2000 | 32 |
| November | 21.0°C2 Nov 2016 | -17.0°C30 Nov 2013 | 77 mm27 Nov 1993 | 151 mm1989 · driest 20 mm in 2012 | 32 |
| December | 18.2°C14 Dec 2015 | -31.0°C27 Dec 1993 | 53 mm3 Dec 1990 | 161 mm1990 · driest 32 mm in 2014 | 32 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 28 | 3 | 11 |
| February | 0 | 0 | 26 | 2 | 9 |
| March | 0 | 0 | 24 | 2 | 5 |
| April | <1 | 0 | 11 | 3 | 1 |
| May | 5 | <1 | <1 | 2 | 0 |
| June | 13 | 2 | 0 | 3 | 0 |
| July | 24 | 5 | 0 | 2 | 0 |
| August | 21 | 4 | 0 | 2 | 0 |
| September | 8 | 1 | <1 | 3 | 0 |
| October | <1 | 0 | 5 | 3 | <1 |
| November | 0 | 0 | 16 | 3 | 3 |
| December | 0 | 0 | 26 | 3 | 8 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 0% | 40% | 8% | 61% | -4.1–1.7°C |
| February | 0% | 36% | 7% | 49% | -4.2–2.7°C |
| March | <1% | 29% | 6% | 39% | 2.1–7.3°C |
| April | 6% | 34% | 11% | 45% | 9.6–14.1°C |
| May | 34% | 31% | 8% | 38% | 16.9–22.1°C |
| June | 60% | 32% | 10% | 41% | 22.4–26.0°C |
| July | 73% | 27% | 8% | 32% | 24.8–28.9°C |
| August | 74% | 25% | 8% | 26% | 24.3–27.9°C |
| September | 50% | 29% | 10% | 39% | 19.4–24.0°C |
| October | 9% | 37% | 9% | 53% | 12.5–16.0°C |
| November | <1% | 37% | 10% | 51% | 5.8–10.4°C |
| December | 0% | 37% | 9% | 51% | -2.1–4.2°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