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Monthly climate in St. Charles, Maryland, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification St. Charles 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 -14 °C (7 °F) or can rise to as high as 38 °C (100 °F).The average annual precipitation amounts to about 1190 mm (46.9 inches) and receives 127 rainy days on the 1 mm (0.04 inches) threshold annually.St. Charles enjoys an average of 3147 hours of sunshine throughout the year, and daylight varies from 9 hours 30 minutes to 14 hours 48 minutes per day.

Monthly average temperatures in St. Charles, Maryland, United States §

The warmest months in St. Charles 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 4 to 6 °C (39 - 43 °F) throughout the day. On average each year, St. Charles experiences 111 days above 25 °C (77.0 °F) and 38 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in St. Charles, 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 21°C
(69°F)		 25°C
(78°F)		 28°C
(83°F)		 31°C
(89°F)		 34°C
(93°F)		 36°C
(96°F)		 38°C
(100°F)		 36°C
(97°F)		 36°C
(97°F)		 35°C
(95°F)		 26°C
(78°F)		 20°C
(68°F)
Mean maximum 18°C
(65°F)		 21°C
(71°F)		 26°C
(78°F)		 28°C
(83°F)		 32°C
(90°F)		 34°C
(94°F)		 36°C
(97°F)		 35°C
(95°F)		 33°C
(91°F)		 30°C
(86°F)		 24°C
(75°F)		 19°C
(66°F)
Average high 7°C
(45°F)		 10°C
(51°F)		 13°C
(56°F)		 19°C
(67°F)		 24°C
(75°F)		 29°C
(84°F)		 32°C
(89°F)		 30°C
(86°F)		 27°C
(80°F)		 22°C
(71°F)		 14°C
(57°F)		 10°C
(50°F)
Daily mean 4°C
(39°F)		 6°C
(42°F)		 9°C
(48°F)		 14°C
(58°F)		 19°C
(67°F)		 24°C
(76°F)		 27°C
(81°F)		 26°C
(79°F)		 23°C
(73°F)		 17°C
(64°F)		 9°C
(49°F)		 6°C
(43°F)
Average low 0°C
(32°F)		 2°C
(35°F)		 5°C
(41°F)		 10°C
(51°F)		 15°C
(60°F)		 20°C
(69°F)		 23°C
(75°F)		 23°C
(73°F)		 19°C
(67°F)		 14°C
(57°F)		 6°C
(42°F)		 2°C
(37°F)
Mean minimum -8°C
(18°F)		 -6°C
(21°F)		 -3°C
(27°F)		 3°C
(37°F)		 7°C
(45°F)		 15°C
(60°F)		 19°C
(67°F)		 18°C
(65°F)		 13°C
(55°F)		 6°C
(44°F)		 -2°C
(29°F)		 -4°C
(25°F)
Minimum -14°C
(7°F)		 -12°C
(10°F)		 -4°C
(25°F)		 0°C
(33°F)		 4°C
(39°F)		 12°C
(54°F)		 18°C
(64°F)		 16°C
(62°F)		 10°C
(50°F)		 4°C
(39°F)		 -3°C
(26°F)		 -9°C
(16°F)

Compare climate in St. Charles with other places

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

Monthly average precipitation in St. Charles, Maryland, United States §

St. Charles usually has the most precipitation in May, July and August, with an average of 13 rainy days and 130 mm (5.1 inches) of precipitation per month.The driest months in St. Charles are January, March and November. On average, 72 mm (2.8 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in St. Charles, 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) 62 (2.4) 93 (3.7) 77 (3.0) 99 (3.9) 118 (4.6) 106 (4.2) 122 (4.8) 151 (5.9) 91 (3.6) 108 (4.2) 78 (3.1) 86 (3.4)
Average precipitation days (≥ 1 mm) 7 12 9 11 11 13 12 16 11 9 7 9

Monthly sunshine hours in St. Charles, Maryland, United States §

The sunniest months in St. Charles are June, July and August, when the sun shines an average of 11 hours 2 minutes a day.Least sunny months in St. Charles: January, February and December receive an average of 5 hours 53 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in St. Charles, 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 158 184 261 271 298 335 357 322 279 255 228 193
Mean daily daylight hours 9h 48m 10h 45m 11h 58m 13h 13m 14h 17m 14h 48m 14h 31m 13h 35m 12h 23m 11h 8m 10h 3m 9h 30m

Solar UV radiation in St. Charles, Maryland, United States §

St. Charles 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, 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 St. Charles UV Index data.

Average daily maximum UV levels by month for St. Charles, 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 9 8 7 5 3