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Monthly climate in Seymour, Connecticut, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Seymour features a humid subtropical climate (Cfa).Temperatures typically range between 0 °C (32 °F) and 24 °C (75 °F) through the year, but rarely can drop to -19 °C (-3 °F) or can rise to as high as 37 °C (98 °F).The average annual precipitation amounts to about 1290 mm (50.8 inches) and receives 128 rainy days on the 1 mm (0.04 inches) threshold annually.Seymour enjoys an average of 2971 hours of sunshine throughout the year, and daylight varies from 9 hours 12 minutes to 15 hours 7 minutes per day.

Monthly average temperatures in Seymour, Connecticut, United States §

The warmest months in Seymour are June, July and August, with daily mean temperatures ranging from 20 to 24 °C (69 - 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 (32 - 36 °F) throughout the day. On average each year, Seymour experiences 71 days above 25 °C (77.0 °F) and 90 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Seymour, 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 19°C
(67°F)		 22°C
(72°F)		 24°C
(76°F)		 29°C
(84°F)		 33°C
(92°F)		 35°C
(95°F)		 37°C
(98°F)		 35°C
(95°F)		 34°C
(93°F)		 32°C
(90°F)		 24°C
(76°F)		 17°C
(62°F)
Mean maximum 14°C
(57°F)		 17°C
(63°F)		 19°C
(67°F)		 23°C
(74°F)		 30°C
(87°F)		 33°C
(92°F)		 35°C
(96°F)		 33°C
(92°F)		 31°C
(88°F)		 27°C
(80°F)		 21°C
(71°F)		 15°C
(59°F)
Average high 3°C
(38°F)		 5°C
(41°F)		 8°C
(47°F)		 14°C
(58°F)		 20°C
(68°F)		 25°C
(78°F)		 28°C
(84°F)		 28°C
(82°F)		 24°C
(76°F)		 18°C
(65°F)		 11°C
(52°F)		 5°C
(42°F)
Daily mean -0°C
(32°F)		 1°C
(34°F)		 4°C
(39°F)		 9°C
(49°F)		 15°C
(60°F)		 20°C
(69°F)		 24°C
(75°F)		 23°C
(74°F)		 19°C
(67°F)		 14°C
(57°F)		 6°C
(44°F)		 2°C
(36°F)
Average low -4°C
(25°F)		 -3°C
(27°F)		 -0°C
(32°F)		 5°C
(41°F)		 11°C
(51°F)		 16°C
(60°F)		 20°C
(67°F)		 19°C
(67°F)		 15°C
(59°F)		 10°C
(50°F)		 2°C
(36°F)		 -2°C
(29°F)
Mean minimum -16°C
(3°F)		 -14°C
(7°F)		 -9°C
(16°F)		 -1°C
(30°F)		 4°C
(39°F)		 11°C
(51°F)		 15°C
(59°F)		 13°C
(55°F)		 8°C
(46°F)		 1°C
(35°F)		 -7°C
(19°F)		 -11°C
(13°F)
Minimum -19°C
(-3°F)		 -19°C
(-2°F)		 -15°C
(6°F)		 -4°C
(25°F)		 1°C
(34°F)		 7°C
(45°F)		 13°C
(56°F)		 11°C
(53°F)		 5°C
(41°F)		 -1°C
(30°F)		 -12°C
(11°F)		 -16°C
(4°F)

Compare climate in Seymour with other places

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

Monthly average precipitation in Seymour, Connecticut, United States §

Seymour usually has the most precipitation in April, July and October, with an average of 12 rainy days and 137 mm (5.4 inches) of precipitation per month.The driest months in Seymour are January, February and March. On average, 84 mm (3.3 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Seymour, 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) 69 (2.7) 93 (3.7) 91 (3.6) 130 (5.1) 110 (4.3) 99 (3.9) 143 (5.6) 94 (3.7) 105 (4.1) 138 (5.4) 93 (3.7) 124 (4.9)
Average precipitation days (≥ 1 mm) 8 10 10 13 12 11 13 12 9 11 9 10

Monthly sunshine hours in Seymour, Connecticut, United States §

The sunniest months in Seymour are June, July and August, when the sun shines an average of 10 hours 39 minutes a day.Least sunny months in Seymour: January, February and December receive an average of 5 hours 33 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Seymour, 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 149 180 254 243 278 317 340 322 282 220 206 175
Mean daily daylight hours 9h 32m 10h 36m 11h 58m 13h 21m 14h 31m 15h 7m 14h 47m 13h 45m 12h 25m 11h 2m 9h 49m 9h 12m

Solar UV radiation in Seymour, Connecticut, United States §

Seymour 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 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 Seymour UV Index data.

Average daily maximum UV levels by month for Seymour, 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 10 10 10 9 8 6 4 2