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Monthly climate in Merrimac, Virginia, United States

Last updated: March 2, 2024

Under the Köppen–Geiger climate classification Merrimac features a humid subtropical climate (Cfa). Temperatures typically range between 2 °C (35 °F) and 23 °C (74 °F) through the year, but rarely can drop to -20 °C (-3 °F) or can rise to as high as 34 °C (93 °F). The average annual precipitation amounts to about 1042 mm (41.0 inches) and receives 121 rainy days on the 1 mm (0.04 inches) threshold annually. Merrimac enjoys an average of 3095 hours of sunshine throughout the year, and daylight varies from 9 hours 37 minutes to 14 hours 40 minutes per day.

Monthly average temperatures in Merrimac, Virginia, United States §

The warmest months in Merrimac are June, July and August, with daily mean temperatures ranging from 21 to 23 °C (70 - 74 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 2 to 5 °C (35 - 41 °F) throughout the day. On average each year, Merrimac experiences 98 days above 25 °C (77.0 °F) and 75 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Merrimac, 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 20°C
(69°F)		 24°C
(76°F)		 30°C
(86°F)		 29°C
(84°F)		 31°C
(88°F)		 32°C
(90°F)		 34°C
(93°F)		 33°C
(92°F)		 33°C
(92°F)		 32°C
(90°F)		 24°C
(75°F)		 20°C
(68°F)
Mean maximum 17°C
(64°F)		 21°C
(70°F)		 24°C
(75°F)		 27°C
(81°F)		 29°C
(85°F)		 30°C
(86°F)		 33°C
(91°F)		 32°C
(90°F)		 31°C
(87°F)		 28°C
(83°F)		 23°C
(73°F)		 18°C
(64°F)
Average high 6°C
(44°F)		 10°C
(50°F)		 13°C
(56°F)		 18°C
(65°F)		 22°C
(72°F)		 26°C
(79°F)		 29°C
(84°F)		 28°C
(82°F)		 25°C
(78°F)		 20°C
(68°F)		 12°C
(54°F)		 9°C
(48°F)
Daily mean 2°C
(35°F)		 5°C
(41°F)		 7°C
(46°F)		 12°C
(54°F)		 17°C
(63°F)		 21°C
(70°F)		 23°C
(74°F)		 22°C
(73°F)		 20°C
(68°F)		 14°C
(58°F)		 6°C
(44°F)		 4°C
(40°F)
Average low -2°C
(28°F)		 0°C
(32°F)		 2°C
(36°F)		 7°C
(44°F)		 12°C
(54°F)		 16°C
(61°F)		 18°C
(65°F)		 18°C
(64°F)		 15°C
(59°F)		 9°C
(49°F)		 1°C
(35°F)		 -0°C
(32°F)
Mean minimum -15°C
(6°F)		 -10°C
(14°F)		 -8°C
(18°F)		 -3°C
(27°F)		 2°C
(37°F)		 10°C
(50°F)		 13°C
(56°F)		 13°C
(56°F)		 8°C
(46°F)		 1°C
(33°F)		 -6°C
(21°F)		 -10°C
(14°F)
Minimum -20°C
(-3°F)		 -15°C
(5°F)		 -12°C
(10°F)		 -5°C
(24°F)		 -1°C
(30°F)		 8°C
(46°F)		 12°C
(54°F)		 11°C
(53°F)		 3°C
(38°F)		 -2°C
(28°F)		 -10°C
(14°F)		 -14°C
(7°F)

Compare climate in Merrimac with other places

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

Monthly average precipitation in Merrimac, Virginia, United States §

Merrimac usually has the most precipitation in February, April and May, with an average of 12 rainy days and 111 mm (4.4 inches) of precipitation per month. The driest months in Merrimac are January, July and November. On average, 63 mm (2.5 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Merrimac, 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) 113 (4.4) 85 (3.3) 104 (4.1) 115 (4.5) 83 (3.3) 57 (2.3) 74 (2.9) 95 (3.7) 96 (3.8) 63 (2.5) 87 (3.4)
Average precipitation days (≥ 1 mm) 9 12 11 12 13 11 9 11 9 9 7 8

Monthly sunshine hours in Merrimac, Virginia, United States §

The sunniest months in Merrimac are June, July and August, when the sun shines an average of 10 hours 52 minutes a day. Least sunny months in Merrimac: January, February and December receive an average of 5 hours 39 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Merrimac, 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 148 179 249 269 296 320 360 318 279 258 226 186
Mean daily daylight hours 9h 55m 10h 49m 11h 59m 13h 10m 14h 10m 14h 40m 14h 23m 13h 30m 12h 22m 11h 11m 10h 9m 9h 37m

Solar UV radiation in Merrimac, Virginia, United States §

Merrimac experiences the highest level of ultraviolet (UV) radiation in May, June and July, when the maximum UV index can reach values of 11 - 11, which corresponds to the Extreme 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 Merrimac UV Index data.

Average daily maximum UV levels by month for Merrimac, 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 8 10 11 11 11 10 9 7 5 3

Detailed Monthly Weather Insights for Merrimac, Virginia, United States

Discover in-depth weather details for every month in Merrimac. Click through the links below for comprehensive overviews of temperature trends, precipitation levels, sunshine hours, and solar UV radiation specifics. Whether planning a visit or simply curious about Merrimac's climate nuances, these monthly breakdowns provide the information you need for an informed understanding of what to expect throughout the year.

Each link leads to a detailed account of the typical weather conditions for that month, providing both locals and tourists with vital information to plan their daily activities, wardrobe, and travel itineraries accordingly.