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Monthly climate in New Haven, Connecticut, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification New Haven features a humid subtropical climate (Cfa).Temperatures typically range between 1 °C (34 °F) and 23 °C (74 °F) through the year, but rarely can drop to -16 °C (3 °F) or can rise to as high as 32 °C (89 °F).The average annual precipitation amounts to about 1485 mm (58.5 inches) and receives 133 rainy days on the 1 mm (0.04 inches) threshold annually.New Haven enjoys an average of 3001 hours of sunshine throughout the year, and daylight varies from 9 hours 14 minutes to 15 hours 5 minutes per day.

Monthly average temperatures in New Haven, Connecticut, United States §

The warmest months in New Haven are July, August and September, 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 1 to 4 °C (34 - 39 °F) throughout the day. On average each year, New Haven experiences 43 days above 25 °C (77.0 °F) and 58 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in New Haven, 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 14°C
(58°F)		 13°C
(56°F)		 19°C
(66°F)		 20°C
(69°F)		 25°C
(77°F)		 30°C
(85°F)		 32°C
(89°F)		 31°C
(88°F)		 30°C
(87°F)		 28°C
(83°F)		 21°C
(69°F)		 16°C
(60°F)
Mean maximum 11°C
(53°F)		 11°C
(53°F)		 14°C
(57°F)		 17°C
(63°F)		 24°C
(75°F)		 28°C
(82°F)		 31°C
(87°F)		 30°C
(85°F)		 27°C
(82°F)		 24°C
(76°F)		 19°C
(67°F)		 14°C
(57°F)
Average high 3°C
(38°F)		 4°C
(40°F)		 7°C
(44°F)		 11°C
(53°F)		 17°C
(62°F)		 22°C
(72°F)		 26°C
(79°F)		 26°C
(79°F)		 23°C
(73°F)		 18°C
(65°F)		 11°C
(52°F)		 6°C
(43°F)
Daily mean 1°C
(34°F)		 1°C
(35°F)		 4°C
(39°F)		 8°C
(47°F)		 14°C
(57°F)		 19°C
(67°F)		 23°C
(74°F)		 23°C
(74°F)		 20°C
(69°F)		 15°C
(60°F)		 8°C
(47°F)		 4°C
(39°F)
Average low -2°C
(29°F)		 -1°C
(30°F)		 1°C
(34°F)		 6°C
(43°F)		 11°C
(52°F)		 17°C
(62°F)		 21°C
(70°F)		 21°C
(70°F)		 18°C
(64°F)		 13°C
(56°F)		 5°C
(42°F)		 1°C
(34°F)
Mean minimum -12°C
(10°F)		 -10°C
(14°F)		 -7°C
(20°F)		 1°C
(34°F)		 5°C
(42°F)		 12°C
(54°F)		 17°C
(63°F)		 17°C
(62°F)		 12°C
(54°F)		 6°C
(43°F)		 -3°C
(27°F)		 -7°C
(20°F)
Minimum -16°C
(3°F)		 -16°C
(4°F)		 -9°C
(15°F)		 -1°C
(30°F)		 2°C
(37°F)		 10°C
(50°F)		 15°C
(60°F)		 15°C
(59°F)		 10°C
(50°F)		 4°C
(39°F)		 -8°C
(19°F)		 -12°C
(11°F)

Compare climate in New Haven with other places

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

Monthly average precipitation in New Haven, Connecticut, United States §

New Haven usually has the most precipitation in April, October and December, with an average of 12 rainy days and 161 mm (6.3 inches) of precipitation per month.The driest months in New Haven are January, June and August. On average, 93 mm (3.7 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in New Haven, 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) 90 (3.5) 132 (5.2) 109 (4.3) 153 (6.0) 130 (5.1) 93 (3.7) 132 (5.2) 96 (3.8) 108 (4.3) 171 (6.7) 112 (4.4) 160 (6.3)
Average precipitation days (≥ 1 mm) 8 12 10 12 13 10 12 11 10 14 10 11

Monthly sunshine hours in New Haven, Connecticut, United States §

The sunniest months in New Haven are June, July and August, when the sun shines an average of 10 hours 42 minutes a day.Least sunny months in New Haven: January, February and December receive an average of 5 hours 36 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in New Haven, 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 154 180 258 246 285 318 343 322 282 224 210 176
Mean daily daylight hours 9h 34m 10h 37m 11h 58m 13h 20m 14h 30m 15h 5m 14h 46m 13h 44m 12h 24m 11h 2m 9h 51m 9h 14m

Solar UV radiation in New Haven, Connecticut, United States §

New Haven 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 New Haven UV Index data.

Average daily maximum UV levels by month for New Haven, 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 9 9 8 6 4 2