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Monthly climate in Dumbarton, Virginia, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Dumbarton features a humid subtropical climate (Cfa).Temperatures typically range between 5 °C (41 °F) and 27 °C (81 °F) through the year, but rarely can drop to -17 °C (1 °F) or can rise to as high as 38 °C (102 °F).The average annual precipitation amounts to about 1237 mm (48.7 inches) and receives 126 rainy days on the 1 mm (0.04 inches) threshold annually.Dumbarton enjoys an average of 3090 hours of sunshine throughout the year, and daylight varies from 9 hours 35 minutes to 14 hours 42 minutes per day.

Monthly average temperatures in Dumbarton, Virginia, United States §

The warmest months in Dumbarton are June, July and August, with daily mean temperatures ranging from 24 to 27 °C (76 - 81 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 5 to 7 °C (41 - 45 °F) throughout the day. On average each year, Dumbarton experiences 131 days above 25 °C (77.0 °F) and 47 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Dumbarton, Virginia, United States.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to June 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Maximum 22°C
(73°F)		 26°C
(79°F)		 30°C
(87°F)		 32°C
(90°F)		 36°C
(97°F)		 37°C
(99°F)		 38°C
(102°F)		 36°C
(98°F)		 37°C
(99°F)		 37°C
(99°F)		 28°C
(82°F)		 22°C
(72°F)
Mean maximum 21°C
(69°F)		 24°C
(75°F)		 27°C
(81°F)		 30°C
(86°F)		 34°C
(94°F)		 35°C
(96°F)		 37°C
(99°F)		 36°C
(97°F)		 34°C
(94°F)		 32°C
(90°F)		 26°C
(79°F)		 21°C
(70°F)
Average high 9°C
(49°F)		 13°C
(55°F)		 16°C
(60°F)		 21°C
(70°F)		 26°C
(79°F)		 30°C
(86°F)		 33°C
(91°F)		 31°C
(88°F)		 28°C
(83°F)		 23°C
(74°F)		 15°C
(60°F)		 12°C
(53°F)
Daily mean 5°C
(41°F)		 7°C
(45°F)		 10°C
(50°F)		 15°C
(60°F)		 20°C
(69°F)		 24°C
(76°F)		 27°C
(81°F)		 26°C
(78°F)		 23°C
(74°F)		 18°C
(64°F)		 10°C
(50°F)		 7°C
(44°F)
Average low 0°C
(33°F)		 2°C
(36°F)		 5°C
(41°F)		 10°C
(50°F)		 15°C
(60°F)		 20°C
(68°F)		 23°C
(73°F)		 22°C
(71°F)		 19°C
(66°F)		 13°C
(56°F)		 5°C
(41°F)		 2°C
(36°F)
Mean minimum -10°C
(14°F)		 -6°C
(21°F)		 -4°C
(25°F)		 1°C
(35°F)		 6°C
(43°F)		 14°C
(58°F)		 18°C
(64°F)		 16°C
(62°F)		 11°C
(52°F)		 4°C
(39°F)		 -3°C
(26°F)		 -6°C
(22°F)
Minimum -17°C
(1°F)		 -8°C
(17°F)		 -5°C
(24°F)		 -1°C
(30°F)		 3°C
(37°F)		 11°C
(52°F)		 15°C
(59°F)		 14°C
(57°F)		 8°C
(47°F)		 1°C
(34°F)		 -5°C
(23°F)		 -9°C
(17°F)

Compare climate in Dumbarton with other places

Compare temperature, precipitation, sunshine, UV index in Dumbarton, Virginia, United States with other places around the world.

Monthly average precipitation in Dumbarton, Virginia, United States §

Dumbarton usually has the most precipitation in June, August and October, with an average of 12 rainy days and 140 mm (5.5 inches) of precipitation per month.The driest months in Dumbarton are January, March and November. On average, 71 mm (2.8 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Dumbarton, Virginia, United States.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Average precipitation mm (inches) 68 (2.7) 99 (3.9) 72 (2.8) 105 (4.1) 102 (4.0) 123 (4.9) 104 (4.1) 170 (6.7) 97 (3.8) 127 (5.0) 74 (2.9) 95 (3.7)
Average precipitation days (≥ 1 mm) 9 11 9 11 11 12 12 15 10 9 8 9

Monthly sunshine hours in Dumbarton, Virginia, United States §

The sunniest months in Dumbarton are June, July and August, when the sun shines an average of 10 hours 44 minutes a day.Least sunny months in Dumbarton: January, February and December receive an average of 5 hours 52 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Dumbarton, Virginia, United States.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Mean monthly sunshine hours 159 181 254 269 292 322 349 316 270 253 226 194
Mean daily daylight hours 9h 53m 10h 48m 11h 59m 13h 11m 14h 12m 14h 42m 14h 25m 13h 31m 12h 22m 11h 10m 10h 7m 9h 35m

Solar UV radiation in Dumbarton, Virginia, United States §

Dumbarton experiences the highest level of ultraviolet (UV) radiation in May, July and August, when the maximum UV index can reach values of 10 - 10, which corresponds to the Very High category of sun exposure.January, November and December are in the Moderate exposure category. In these months, the maximum values of the UV index do not exceed 5. For more detailed information, check out our hourly Dumbarton UV Index data.

Average daily maximum UV levels by month for Dumbarton, Virginia, United States.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2022 to January 2023.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
UV Index (month maximum) 3 6 7 9 10 10 10 10 9 7 5 3