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Monthly climate in Mount Vernon, Maryland, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Mount Vernon features a humid subtropical climate (Cfa).Temperatures typically range between 4 °C (39 °F) and 27 °C (81 °F) through the year, but rarely can drop to -16 °C (3 °F) or can rise to as high as 37 °C (98 °F).The average annual precipitation amounts to about 1238 mm (48.7 inches) and receives 129 rainy days on the 1 mm (0.04 inches) threshold annually.Mount Vernon enjoys an average of 3252 hours of sunshine throughout the year, and daylight varies from 9 hours 32 minutes to 14 hours 46 minutes per day.

Monthly average temperatures in Mount Vernon, Maryland, United States §

The warmest months in Mount Vernon are June, July and August, with daily mean temperatures ranging from 24 to 27 °C (75 - 81 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 4 to 6 °C (39 - 44 °F) throughout the day. On average each year, Mount Vernon experiences 106 days above 25 °C (77.0 °F) and 35 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Mount Vernon, Maryland, 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 20°C
(69°F)		 23°C
(74°F)		 28°C
(83°F)		 30°C
(87°F)		 33°C
(91°F)		 33°C
(91°F)		 37°C
(98°F)		 35°C
(95°F)		 33°C
(92°F)		 32°C
(91°F)		 25°C
(77°F)		 21°C
(69°F)
Mean maximum 18°C
(65°F)		 19°C
(66°F)		 24°C
(75°F)		 27°C
(81°F)		 31°C
(88°F)		 32°C
(90°F)		 34°C
(94°F)		 33°C
(92°F)		 32°C
(89°F)		 29°C
(84°F)		 23°C
(74°F)		 18°C
(65°F)
Average high 8°C
(46°F)		 10°C
(51°F)		 13°C
(55°F)		 18°C
(65°F)		 23°C
(74°F)		 27°C
(82°F)		 30°C
(87°F)		 29°C
(85°F)		 26°C
(80°F)		 22°C
(71°F)		 14°C
(58°F)		 10°C
(50°F)
Daily mean 4°C
(39°F)		 6°C
(43°F)		 9°C
(48°F)		 14°C
(58°F)		 19°C
(67°F)		 24°C
(75°F)		 27°C
(81°F)		 26°C
(79°F)		 23°C
(74°F)		 18°C
(64°F)		 10°C
(50°F)		 6°C
(44°F)
Average low 0°C
(33°F)		 2°C
(36°F)		 5°C
(41°F)		 10°C
(51°F)		 15°C
(60°F)		 20°C
(69°F)		 24°C
(75°F)		 23°C
(73°F)		 20°C
(68°F)		 14°C
(58°F)		 6°C
(43°F)		 3°C
(37°F)
Mean minimum -10°C
(15°F)		 -7°C
(20°F)		 -3°C
(26°F)		 3°C
(37°F)		 8°C
(47°F)		 15°C
(59°F)		 19°C
(66°F)		 18°C
(65°F)		 13°C
(55°F)		 6°C
(44°F)		 -2°C
(28°F)		 -5°C
(24°F)
Minimum -16°C
(3°F)		 -11°C
(12°F)		 -6°C
(22°F)		 0°C
(32°F)		 5°C
(42°F)		 12°C
(54°F)		 15°C
(60°F)		 17°C
(63°F)		 11°C
(51°F)		 4°C
(40°F)		 -4°C
(24°F)		 -9°C
(16°F)

Compare climate in Mount Vernon with other places

Compare temperature, precipitation, sunshine, UV index in Mount Vernon, Maryland, United States with other places around the world.

Monthly average precipitation in Mount Vernon, Maryland, United States §

Mount Vernon usually has the most precipitation in July, August and October, with an average of 12 rainy days and 135 mm (5.3 inches) of precipitation per month.The driest months in Mount Vernon are January, April and November. On average, 81 mm (3.2 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Mount Vernon, Maryland, 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) 71 (2.8) 94 (3.7) 91 (3.6) 88 (3.5) 104 (4.1) 106 (4.2) 139 (5.5) 149 (5.8) 100 (3.9) 117 (4.6) 84 (3.3) 97 (3.8)
Average precipitation days (≥ 1 mm) 9 11 10 11 11 12 13 15 10 9 8 10

Monthly sunshine hours in Mount Vernon, Maryland, United States §

The sunniest months in Mount Vernon are June, July and August, when the sun shines an average of 11 hours 23 minutes a day.Least sunny months in Mount Vernon: January, February and December receive an average of 5 hours 56 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Mount Vernon, Maryland, 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 160 187 271 289 318 345 366 336 294 260 229 193
Mean daily daylight hours 9h 49m 10h 46m 11h 58m 13h 13m 14h 15m 14h 46m 14h 29m 13h 33m 12h 22m 11h 9m 10h 4m 9h 32m

Solar UV radiation in Mount Vernon, Maryland, United States §

Mount Vernon 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, February 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 Mount Vernon UV Index data.

Average daily maximum UV levels by month for Mount Vernon, Maryland, 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 5 7 9 10 10 10 10 8 7 5 3