May
May · September · October
United States · 1991–2020
May leads for comfortable weather in Arlington: typically 22.9°C by day, 14.6°C at night, with 90 mm of rain. Based on measured 1991–2020 NOAA station history.
May · September · October
July · August · June
April · October · May
The weakest month is January, scoring 10 against May’s 83 — days reach only 8.2°C, 16° 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 | 8.2°C | 0°C | 78 mm | 8 | 6.4°C | 9 h 52 | 10 | Good coverage |
| February | 9.5°C | 0.8°C | 73 mm | 7.3 | 5.1°C | 10 h 46 | 17 | Good coverage |
| March | 12.8°C | 4°C | 78 mm | 7.7 | 7.4°C | 11 h 51 | 33 | Good coverage |
| April | 18.4°C | 9.1°C | 86 mm | 8.2 | 12.0°C | 13 h 06 | 59 | Good coverage |
| May | 22.9°C | 14.6°C | 90 mm | 8.7 | 17.0°C | 14 h 09 | 83 | Good coverage |
| June | 27.4°C | 19.3°C | 90 mm | 9.5 | 22.2°C | 14 h 42 | 67 | Good coverage |
| July | 29.9°C | 21.8°C | 107 mm | 7.8 | 25.4°C | 14 h 29 | 54 | Good coverage |
| August | 28.7°C | 21°C | 123 mm | 8.6 | 25.9°C | 13 h 35 | 56 | Good coverage |
| September | 25.9°C | 18.2°C | 103 mm | 6.2 | 24.2°C | 12 h 22 | 76 | Good coverage |
| October | 20.7°C | 12.4°C | 108 mm | 6.8 | 19.8°C | 11 h 10 | 71 | Good coverage |
| November | 14.8°C | 6.2°C | 86 mm | 7.2 | 14.0°C | 10 h 07 | 43 | Good coverage |
| December | 11°C | 2.4°C | 90 mm | 7.9 | 9.6°C | 9 h 37 | 22 | Good coverage |
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 22.2°C1 Jan 2022 | -15.1°C30 Jan 2014 | 48 mm23 Jan 2016 | 127 mm2017 · driest 38 mm in 2009 | 22 |
| February | 25.9°C23 Feb 2023 | -14.6°C21 Feb 2015 | 55 mm11 Feb 2020 | 158 mm2025 · driest 26 mm in 2006 | 22 |
| March | 28.1°C20 Mar 2020 | -7.8°C7 Mar 2015 | 81 mm28 Mar 2024 | 242 mm2024 · driest 7 mm in 2006 | 23 |
| April | 30.7°C16 Apr 2026 | -2.3°C6 Apr 2016 | 55 mm15 Apr 2007 | 139 mm2007 · driest 12 mm in 2011 | 23 |
| May | 33.6°C30 May 2019 | 1.8°C10 May 2020 | 87 mm16 May 2014 | 196 mm2017 · driest 21 mm in 2011 | 23 |
| June | 36.4°C24 Jun 2010 | 7.9°C2 Jun 2014 | 75 mm5 Jun 2017 | 196 mm2023 · driest 34 mm in 2010 | 23 |
| July | 38.8°C25 Jul 2010 | 12.6°C3 Jul 2010 | 88 mm24 Jul 2004 | 271 mm2004 · driest 36 mm in 2006 | 23 |
| August | 36.6°C8 Aug 2007 | 12.1°C21 Aug 2024 | 156 mm27 Aug 2011 | 276 mm2004 · driest 22 mm in 2022 | 22 |
| September | 33.8°C11 Sep 2007 | 7.7°C30 Sep 2021 | 151 mm8 Sep 2014 | 291 mm2014 · driest 3 mm in 2007 | 22 |
| October | 33.2°C2 Oct 2019 | 0.0°C31 Oct 2011 | 147 mm8 Oct 2016 | 252 mm2012 · driest 2 mm in 2024 | 22 |
| November | 26.7°C6 Nov 2018 | -4.7°C14 Nov 2019 | 126 mm12 Nov 2020 | 220 mm2009 · driest 12 mm in 2010 | 22 |
| December | 25.8°C24 Dec 2015 | -10.7°C24 Dec 2022 | 77 mm11 Dec 2008 | 207 mm2009 · driest 26 mm in 2011 | 22 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) |
|---|---|---|---|---|
| January | 0 | 0 | 16 | 3 |
| February | 0 | 0 | 13 | 3 |
| March | <1 | 0 | 7 | 3 |
| April | 4 | <1 | <1 | 3 |
| May | 11 | 1 | 0 | 3 |
| June | 23 | 8 | 0 | 3 |
| July | 30 | 15 | 0 | 3 |
| August | 29 | 9 | 0 | 3 |
| September | 18 | 3 | 0 | 3 |
| October | 5 | <1 | <1 | 3 |
| November | <1 | 0 | 3 | 3 |
| December | <1 | 0 | 10 | 3 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 2% | 26% | 9% | 24% | 5.6–11.0°C |
| February | 5% | 27% | 10% | 36% | 6.2–13.3°C |
| March | 13% | 25% | 9% | 22% | 10.3–15.7°C |
| April | 30% | 27% | 9% | 29% | 17.1–20.4°C |
| May | 55% | 27% | 10% | 31% | 20.7–25.1°C |
| June | 69% | 30% | 9% | 31% | 26.4–29.1°C |
| July | 74% | 26% | 11% | 24% | 28.7–31.2°C |
| August | 74% | 26% | 9% | 25% | 27.2–29.9°C |
| September | 78% | 21% | 9% | 18% | 24.6–27.3°C |
| October | 46% | 21% | 8% | 20% | 19.3–22.1°C |
| November | 11% | 23% | 8% | 18% | 12.9–16.8°C |
| December | 3% | 24% | 9% | 23% | 8.9–13.3°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