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Monthly climate in Grafton, West Virginia, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Grafton features a humid subtropical climate (Cfa).Temperatures typically range between 0 °C (33 °F) and 23 °C (74 °F) through the year, but rarely can drop to -23 °C (-9 °F) or can rise to as high as 33 °C (91 °F).The average annual precipitation amounts to about 1524 mm (60.0 inches) and receives 174 rainy days on the 1 mm (0.04 inches) threshold annually.Grafton enjoys an average of 2787 hours of sunshine throughout the year, and daylight varies from 9 hours 27 minutes to 14 hours 51 minutes per day.

Monthly average temperatures in Grafton, West Virginia, United States §

The warmest months in Grafton are June, July and August, with daily mean temperatures ranging from 20 to 23 °C (69 - 74 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 0 to 3 °C (33 - 38 °F) throughout the day. On average each year, Grafton experiences 85 days above 25 °C (77.0 °F) and 83 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Grafton, West 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 21°C
(70°F)		 25°C
(78°F)		 26°C
(80°F)		 29°C
(84°F)		 30°C
(86°F)		 31°C
(88°F)		 33°C
(91°F)		 32°C
(90°F)		 32°C
(89°F)		 31°C
(89°F)		 25°C
(78°F)		 20°C
(68°F)
Mean maximum 17°C
(62°F)		 20°C
(69°F)		 24°C
(75°F)		 27°C
(81°F)		 29°C
(85°F)		 30°C
(87°F)		 31°C
(89°F)		 31°C
(88°F)		 30°C
(87°F)		 28°C
(83°F)		 23°C
(74°F)		 18°C
(65°F)
Average high 4°C
(40°F)		 8°C
(47°F)		 12°C
(53°F)		 17°C
(62°F)		 22°C
(71°F)		 25°C
(77°F)		 28°C
(82°F)		 27°C
(80°F)		 25°C
(76°F)		 19°C
(67°F)		 11°C
(52°F)		 7°C
(45°F)
Daily mean 0°C
(33°F)		 3°C
(38°F)		 6°C
(44°F)		 11°C
(53°F)		 17°C
(63°F)		 20°C
(69°F)		 23°C
(74°F)		 22°C
(72°F)		 19°C
(67°F)		 14°C
(58°F)		 6°C
(43°F)		 3°C
(38°F)
Average low -3°C
(26°F)		 -1°C
(30°F)		 2°C
(35°F)		 6°C
(44°F)		 12°C
(54°F)		 16°C
(61°F)		 19°C
(66°F)		 18°C
(64°F)		 15°C
(59°F)		 9°C
(49°F)		 2°C
(35°F)		 -1°C
(31°F)
Mean minimum -17°C
(3°F)		 -14°C
(7°F)		 -10°C
(14°F)		 -4°C
(26°F)		 2°C
(36°F)		 9°C
(49°F)		 14°C
(57°F)		 12°C
(54°F)		 8°C
(46°F)		 1°C
(34°F)		 -6°C
(22°F)		 -10°C
(14°F)
Minimum -23°C
(-9°F)		 -19°C
(-2°F)		 -16°C
(3°F)		 -6°C
(22°F)		 -2°C
(28°F)		 5°C
(42°F)		 13°C
(55°F)		 11°C
(52°F)		 4°C
(39°F)		 -2°C
(29°F)		 -10°C
(15°F)		 -15°C
(5°F)

Compare climate in Grafton with other places

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

Monthly average precipitation in Grafton, West Virginia, United States §

Grafton usually has the most precipitation in February, April and May, with an average of 17 rainy days and 157 mm (6.2 inches) of precipitation per month.The driest months in Grafton are January, September and November. On average, 101 mm (4.0 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Grafton, West 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) 102 (4.0) 159 (6.2) 122 (4.8) 152 (6.0) 160 (6.3) 145 (5.7) 115 (4.5) 114 (4.5) 113 (4.5) 120 (4.7) 89 (3.5) 134 (5.3)
Average precipitation days (≥ 1 mm) 15 16 15 17 18 17 14 15 9 12 11 15

Monthly sunshine hours in Grafton, West Virginia, United States §

The sunniest months in Grafton are June, July and August, when the sun shines an average of 10 hours 17 minutes a day.Least sunny months in Grafton: January, February and December receive an average of 4 hours 18 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Grafton, West 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 106 139 229 230 282 306 336 302 280 235 190 147
Mean daily daylight hours 9h 45m 10h 43m 11h 58m 13h 15m 14h 19m 14h 51m 14h 34m 13h 36m 12h 23m 11h 7m 10h 0m 9h 27m

Solar UV radiation in Grafton, West Virginia, United States §

Grafton 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 Grafton UV Index data.

Average daily maximum UV levels by month for Grafton, West 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 5 7 9 10 10 10 10 8 7 5 3