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Monthly climate in Old Mystic, Connecticut, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Old Mystic features a oceanic climate (Cfb).Temperatures typically range between 0 °C (33 °F) and 23 °C (75 °F) through the year, but rarely can drop to -20 °C (-4 °F) or can rise to as high as 38 °C (101 °F).The average annual precipitation amounts to about 1314 mm (51.7 inches) and receives 127 rainy days on the 1 mm (0.04 inches) threshold annually.Old Mystic enjoys an average of 3024 hours of sunshine throughout the year, and daylight varies from 9 hours 13 minutes to 15 hours 6 minutes per day.

Monthly average temperatures in Old Mystic, Connecticut, United States §

The warmest months in Old Mystic are June, July and August, with daily mean temperatures ranging from 20 to 23 °C (68 - 75 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 0 to 2 °C (33 - 36 °F) throughout the day. On average each year, Old Mystic experiences 66 days above 25 °C (77.0 °F) and 87 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Old Mystic, Connecticut, 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)		 20°C
(67°F)		 21°C
(70°F)		 28°C
(83°F)		 33°C
(92°F)		 35°C
(96°F)		 38°C
(101°F)		 34°C
(94°F)		 33°C
(91°F)		 30°C
(87°F)		 24°C
(75°F)		 17°C
(63°F)
Mean maximum 14°C
(58°F)		 16°C
(61°F)		 18°C
(65°F)		 22°C
(71°F)		 30°C
(87°F)		 32°C
(91°F)		 36°C
(96°F)		 33°C
(91°F)		 30°C
(86°F)		 27°C
(80°F)		 21°C
(71°F)		 16°C
(61°F)
Average high 4°C
(39°F)		 5°C
(42°F)		 8°C
(48°F)		 14°C
(57°F)		 20°C
(68°F)		 25°C
(77°F)		 28°C
(83°F)		 28°C
(82°F)		 24°C
(75°F)		 18°C
(65°F)		 11°C
(53°F)		 6°C
(43°F)
Daily mean 0°C
(33°F)		 1°C
(35°F)		 4°C
(40°F)		 9°C
(49°F)		 15°C
(59°F)		 20°C
(68°F)		 23°C
(75°F)		 23°C
(74°F)		 19°C
(67°F)		 14°C
(58°F)		 7°C
(45°F)		 2°C
(36°F)
Average low -4°C
(25°F)		 -3°C
(28°F)		 -0°C
(32°F)		 5°C
(41°F)		 10°C
(51°F)		 15°C
(60°F)		 19°C
(67°F)		 19°C
(67°F)		 15°C
(60°F)		 10°C
(50°F)		 2°C
(36°F)		 -2°C
(29°F)
Mean minimum -16°C
(4°F)		 -14°C
(7°F)		 -9°C
(16°F)		 -1°C
(30°F)		 4°C
(40°F)		 11°C
(51°F)		 15°C
(59°F)		 13°C
(56°F)		 8°C
(47°F)		 2°C
(36°F)		 -7°C
(20°F)		 -10°C
(14°F)
Minimum -20°C
(-4°F)		 -17°C
(2°F)		 -15°C
(6°F)		 -3°C
(26°F)		 1°C
(35°F)		 7°C
(44°F)		 13°C
(56°F)		 11°C
(51°F)		 5°C
(42°F)		 -1°C
(31°F)		 -11°C
(12°F)		 -15°C
(5°F)

Compare climate in Old Mystic with other places

Compare temperature, precipitation, sunshine, UV index in Old Mystic, Connecticut, United States with other places around the world.

Monthly average precipitation in Old Mystic, Connecticut, United States §

Old Mystic usually has the most precipitation in July, October and December, with an average of 11 rainy days and 137 mm (5.4 inches) of precipitation per month.The driest months in Old Mystic are January, February and September. On average, 87 mm (3.4 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Old Mystic, Connecticut, 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) 72 (2.8) 92 (3.6) 98 (3.8) 129 (5.1) 109 (4.3) 96 (3.8) 149 (5.8) 111 (4.4) 96 (3.8) 132 (5.2) 101 (4.0) 130 (5.1)
Average precipitation days (≥ 1 mm) 8 10 9 12 12 10 13 12 9 12 10 10

Monthly sunshine hours in Old Mystic, Connecticut, United States §

The sunniest months in Old Mystic are June, July and August, when the sun shines an average of 10 hours 50 minutes a day.Least sunny months in Old Mystic: January, February and December receive an average of 5 hours 41 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Old Mystic, Connecticut, 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 150 187 260 249 288 323 345 328 280 223 206 179
Mean daily daylight hours 9h 33m 10h 37m 11h 58m 13h 21m 14h 31m 15h 6m 14h 47m 13h 44m 12h 25m 11h 2m 9h 50m 9h 13m

Solar UV radiation in Old Mystic, Connecticut, United States §

Old Mystic experiences the highest level of ultraviolet (UV) radiation in May, June and August, when the maximum UV index can reach values of 9 - 10, which corresponds to the Very High category of sun exposure.January, November and December are in the Low / 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 Old Mystic UV Index data.

Average daily maximum UV levels by month for Old Mystic, Connecticut, 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 6 8 9 10 9 9 8 6 4 2