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Monthly climate in Clayton, Delaware, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Clayton features a humid subtropical climate (Cfa).Temperatures typically range between 3 °C (37 °F) and 27 °C (80 °F) through the year, but rarely can drop to -16 °C (3 °F) or can rise to as high as 36 °C (97 °F).The average annual precipitation amounts to about 1285 mm (50.6 inches) and receives 127 rainy days on the 1 mm (0.04 inches) threshold annually.Clayton enjoys an average of 3163 hours of sunshine throughout the year, and daylight varies from 9 hours 26 minutes to 14 hours 52 minutes per day.

Monthly average temperatures in Clayton, Delaware, United States §

The warmest months in Clayton are June, July and August, with daily mean temperatures ranging from 24 to 27 °C (75 - 80 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 3 to 5 °C (37 - 42 °F) throughout the day. On average each year, Clayton experiences 103 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 Clayton, Delaware, 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
(68°F)		 25°C
(77°F)		 28°C
(83°F)		 31°C
(88°F)		 34°C
(93°F)		 34°C
(93°F)		 36°C
(97°F)		 34°C
(94°F)		 33°C
(92°F)		 34°C
(94°F)		 25°C
(78°F)		 20°C
(68°F)
Mean maximum 17°C
(64°F)		 20°C
(69°F)		 25°C
(76°F)		 28°C
(83°F)		 32°C
(90°F)		 33°C
(92°F)		 35°C
(95°F)		 34°C
(93°F)		 32°C
(90°F)		 29°C
(84°F)		 23°C
(75°F)		 18°C
(64°F)
Average high 7°C
(44°F)		 9°C
(49°F)		 12°C
(54°F)		 18°C
(65°F)		 23°C
(74°F)		 28°C
(83°F)		 31°C
(87°F)		 29°C
(85°F)		 26°C
(80°F)		 21°C
(70°F)		 13°C
(56°F)		 9°C
(48°F)
Daily mean 3°C
(37°F)		 5°C
(41°F)		 8°C
(46°F)		 14°C
(57°F)		 19°C
(66°F)		 24°C
(75°F)		 27°C
(80°F)		 25°C
(78°F)		 22°C
(73°F)		 17°C
(63°F)		 9°C
(49°F)		 5°C
(42°F)
Average low -1°C
(31°F)		 1°C
(34°F)		 4°C
(39°F)		 9°C
(49°F)		 15°C
(58°F)		 20°C
(68°F)		 23°C
(74°F)		 22°C
(72°F)		 19°C
(66°F)		 13°C
(57°F)		 5°C
(41°F)		 2°C
(35°F)
Mean minimum -10°C
(14°F)		 -8°C
(18°F)		 -4°C
(25°F)		 2°C
(36°F)		 7°C
(45°F)		 14°C
(58°F)		 18°C
(65°F)		 18°C
(64°F)		 12°C
(54°F)		 6°C
(42°F)		 -3°C
(26°F)		 -5°C
(23°F)
Minimum -16°C
(3°F)		 -14°C
(8°F)		 -7°C
(20°F)		 0°C
(32°F)		 4°C
(39°F)		 11°C
(52°F)		 17°C
(62°F)		 16°C
(62°F)		 9°C
(48°F)		 4°C
(39°F)		 -6°C
(22°F)		 -10°C
(15°F)

Compare climate in Clayton with other places

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

Monthly average precipitation in Clayton, Delaware, United States §

Clayton usually has the most precipitation in May, July and August, with an average of 13 rainy days and 149 mm (5.9 inches) of precipitation per month.The driest months in Clayton are January, September and November. On average, 77 mm (3.0 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Clayton, Delaware, 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) 58 (2.3) 98 (3.8) 99 (3.9) 96 (3.8) 129 (5.1) 103 (4.1) 144 (5.7) 176 (6.9) 94 (3.7) 115 (4.5) 78 (3.1) 95 (3.7)
Average precipitation days (≥ 1 mm) 8 11 10 11 12 11 12 16 11 8 8 9

Monthly sunshine hours in Clayton, Delaware, United States §

The sunniest months in Clayton are June, July and August, when the sun shines an average of 11 hours 13 minutes a day.Least sunny months in Clayton: January, February and December receive an average of 5 hours 48 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Clayton, Delaware, 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 155 183 260 275 304 340 361 330 285 247 229 189
Mean daily daylight hours 9h 44m 10h 43m 11h 58m 13h 15m 14h 20m 14h 52m 14h 35m 13h 37m 12h 23m 11h 7m 10h 0m 9h 26m

Solar UV radiation in Clayton, Delaware, United States §

Clayton experiences the highest level of ultraviolet (UV) radiation in May, June and July, 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 4. For more detailed information, check out our hourly Clayton UV Index data.

Average daily maximum UV levels by month for Clayton, Delaware, 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 9 8 7 4 3