October
October · April · May
United States · 1991–2020
October leads for comfortable weather in Arlington: typically 25.5°C by day, 12.8°C at night, with 119 mm of rain. Based on measured 1991–2020 NOAA station history.
October · April · May
September · June · August
March · November · October
The weakest month is January, scoring 19 against October’s 77 — days reach only 12.3°C, 12° below the 24°C the score treats as ideal, and nights drop to 2.1°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 | 12.3°C | 2.1°C | 135 mm | 8.4 | 10 h 12 | 19 | Strong coverage |
| February | 14.8°C | 3.9°C | 133 mm | 7.6 | 10 h 58 | 32 | Strong coverage |
| March | 19.4°C | 7.8°C | 132 mm | 8.2 | 11 h 53 | 54 | Strong coverage |
| April | 24°C | 12.4°C | 166 mm | 7.5 | 12 h 57 | 73 | Strong coverage |
| May | 28.1°C | 17.4°C | 126 mm | 7.8 | 13 h 50 | 65 | Strong coverage |
| June | 31.7°C | 21.5°C | 106 mm | 7.3 | 14 h 18 | 49 | Strong coverage |
| July | 33.3°C | 23°C | 98 mm | 7.2 | 14 h 07 | 42 | Strong coverage |
| August | 33.3°C | 22.5°C | 101 mm | 6.8 | 13 h 22 | 43 | Strong coverage |
| September | 30.7°C | 19°C | 90 mm | 5 | 12 h 20 | 61 | Strong coverage |
| October | 25.5°C | 12.8°C | 119 mm | 5.9 | 11 h 18 | 77 | Strong coverage |
| November | 18.9°C | 7.1°C | 130 mm | 7.4 | 10 h 25 | 52 | Strong coverage |
| December | 13.8°C | 3.6°C | 145 mm | 8.9 | 10 h | 25 | Strong coverage |
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 30.0°C3 Jan 1902 | -20.6°C12 Jan 1962 | 154 mm3 Jan 1949 | 364 mm1946 · driest 17 mm in 2003 | 98 |
| February | 31.7°C24 Feb 1927 | -22.2°C13 Feb 1899 | 126 mm21 Feb 1961 | 409 mm1903 · driest 18 mm in 1893 | 97 |
| March | 33.9°C31 Mar 1946 | -8.9°C3 Mar 1943 | 167 mm5 Mar 1984 | 408 mm1980 · driest 8 mm in 2007 | 97 |
| April | 35.0°C1 Apr 1941 | 0.0°C13 Apr 1940 | 194 mm29 Apr 1991 | 585 mm1991 · driest 16 mm in 1965 | 97 |
| May | 37.2°C27 May 1953 | 4.4°C2 May 1976 | 161 mm15 May 2008 | 350 mm1983 · driest 14 mm in 1897 | 100 |
| June | 42.2°C29 Jun 1952 | 10.0°C8 Jun 1894 | 99 mm23 Jun 2018 | 330 mm1900 · driest 0 mm in 1952 | 100 |
| July | 42.8°C13 Jul 1930 | 13.9°C15 Jul 1967 | 120 mm10 Jul 1970 | 277 mm1950 · driest 0 mm in 1896 | 99 |
| August | 42.8°C18 Aug 1951 | 12.8°C22 Aug 1961 | 135 mm27 Aug 1992 | 331 mm1960 · driest 0 mm in 2000 | 98 |
| September | 43.3°C1 Sep 1951 | 1.7°C29 Sep 1967 | 158 mm4 Sep 2008 | 347 mm1958 · driest 0 mm in 2004 | 100 |
| October | 36.7°C3 Oct 1954 | -1.7°C30 Oct 1954 | 210 mm7 Oct 1982 | 468 mm1982 · driest 0 mm in 1963 | 100 |
| November | 36.7°C21 Nov 1899 | -7.8°C19 Nov 1903 | 222 mm19 Nov 1948 | 504 mm1948 · driest 0 mm in 1949 | 95 |
| December | 31.1°C22 Dec 1898 | -16.1°C18 Dec 1929 | 138 mm4 Dec 1982 | 456 mm1982 · driest 7 mm in 2010 | 95 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) |
|---|---|---|---|---|
| January | <1 | 0 | 12 | 4 |
| February | 2 | 0 | 7 | 4 |
| March | 7 | <1 | 2 | 4 |
| April | 16 | 2 | 0 | 4 |
| May | 26 | 12 | 0 | 4 |
| June | 29 | 24 | 0 | 3 |
| July | 31 | 28 | 0 | 3 |
| August | 31 | 27 | 0 | 3 |
| September | 28 | 20 | 0 | 2 |
| October | 19 | 6 | 0 | 3 |
| November | 5 | <1 | 3 | 3 |
| December | 1 | 0 | 9 | 4 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 15% | 27% | 13% | 29% | 9.4–16.5°C |
| February | 21% | 27% | 15% | 30% | 11.4–18.4°C |
| March | 40% | 27% | 14% | 27% | 16.5–22.4°C |
| April | 65% | 24% | 13% | 24% | 22.5–26.9°C |
| May | 74% | 25% | 12% | 24% | 26.7–30.8°C |
| June | 78% | 23% | 10% | 22% | 30.3–34.8°C |
| July | 76% | 24% | 11% | 25% | 32.0–35.7°C |
| August | 81% | 20% | 9% | 18% | 31.7–35.6°C |
| September | 82% | 18% | 7% | 14% | 29.0–33.6°C |
| October | 76% | 16% | 8% | 14% | 23.7–28.9°C |
| November | 40% | 22% | 12% | 21% | 16.4–22.1°C |
| December | 15% | 27% | 14% | 30% | 11.6–17.2°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