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Reston, Virginia climate

Cfa Humid subtropical

Reston has a seasonal cool-temperate climate (Humid subtropical, Köppen Cfa). The hottest month is July with an average daily high near 84°F, while the coldest is January averaging around 23°F at night. Precipitation is fairly even year-round, totalling about 44 inches. Light snow accumulates each winter (18 inches of snow per year on average).

☀️ Summers

Warm

Highs near 84°F in July.

About 11 days a year above 90 °F

❄️ Winters

Cold

Lows near 23°F in January.

About 82 freezing nights a year

🌧️ Rain & snow

Wet

About 44 in of rain a year, plus 18 in of snow.

Snow falls through the winter months

⛅ Sky & trend

Partly cloudy

A roughly even mix of sun and cloud.

−0.4 °F vs 50 years ago

Temperature & precipitation

Daily high–low temperature range with the monthly average, plus monthly precipitation split into rain and snow · 1991–2020 normals · hover a month for the exact figures

Clear vs cloudy days

Share of days each month that are clear, partly cloudy or cloudy · 1991–2020 · hover a month for the day counts

Reston climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	42	45	53	65	72	80	84	82	76	65	56	46
Avg temp (°F)	33	35	42	53	62	70	75	74	67	55	45	37
Avg low (°F)	23	24	32	41	52	61	67	65	57	45	35	28
Precipitation (in)	3.3	2.6	3.8	3.4	4.3	4.1	4.3	3.5	4.2	3.5	3.1	3.4
Snowfall (in)	6.5	7.5	2.0	—	—	—	—	—	—	—	0.1	2.4

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°F)	42	45	53	65	72	80
Avg temp (°F)	33	35	42	53	62	70
Avg low (°F)	23	24	32	41	52	61
Precipitation (in)	3.3	2.6	3.8	3.4	4.3	4.1
Snowfall (in)	6.5	7.5	2.0	—	—	—

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	84	82	76	65	56	46
Avg temp (°F)	75	74	67	55	45	37
Avg low (°F)	67	65	57	45	35	28
Precipitation (in)	4.3	3.5	4.2	3.5	3.1	3.4
Snowfall (in)	—	—	—	—	0.1	2.4

How often — frequency of weather events

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	12	9	10	10	13	11	10	10	9	9	9	11
Days with high ≥ 90°F (days)	—	—	—	0.1	0.4	2	5	3	0.9	0.0	—	—
Days with low ≤ 32°F (days)	20	17	13	2	—	—	—	—	—	1.0	9	18
Days with snowfall ≥ 1 in (days)	2	1	0.8	—	—	—	—	—	—	—	0.1	0.8

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Days with measurable rain (days)	12	9	10	10	13	11
Days with high ≥ 90°F (days)	—	—	—	0.1	0.4	2
Days with low ≤ 32°F (days)	20	17	13	2	—	—
Days with snowfall ≥ 1 in (days)	2	1	0.8	—	—	—

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	10	10	9	9	9	11
Days with high ≥ 90°F (days)	5	3	0.9	0.0	—	—
Days with low ≤ 32°F (days)	—	—	—	1.0	9	18
Days with snowfall ≥ 1 in (days)	—	—	—	—	0.1	0.8

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	62	62	62	62	62	59	57	55	54	52	58	61
Clear days (≤ 30% cloud)	6	5	6	6	6	6	7	8	9	10	7	6
Partly cloudy days (30–70%)	11	10	10	9	11	12	13	12	10	10	10	11
Cloudy days (≥ 70%)	14	13	15	14	15	12	12	11	11	11	13	14
Relative humidity (%)	83	82	79	77	77	73	67	67	70	75	78	83
Wind speed (mph)	5.2	5.4	5.5	5.0	4.1	3.6	3.3	3.3	3.7	4.0	4.3	4.5

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	62	62	62	62	62	59
Clear days (≤ 30% cloud)	6	5	6	6	6	6
Partly cloudy days (30–70%)	11	10	10	9	11	12
Cloudy days (≥ 70%)	14	13	15	14	15	12
Relative humidity (%)	83	82	79	77	77	73
Wind speed (mph)	5.2	5.4	5.5	5.0	4.1	3.6

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	57	55	54	52	58	61
Clear days (≤ 30% cloud)	7	8	9	10	7	6
Partly cloudy days (30–70%)	13	12	10	10	10	11
Cloudy days (≥ 70%)	12	11	11	11	13	14
Relative humidity (%)	67	67	70	75	78	83
Wind speed (mph)	3.3	3.3	3.7	4.0	4.3	4.5

Methodology & sources

Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Vienna (NOAA GHCN station USC00448737), about 10 km from the city centre.

Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.

How we build these numbers →