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Monthly climate in Portland, Connecticut, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Portland features a humid continental climate (Dfa).Temperatures typically range between 0 °C (32 °F) and 24 °C (75 °F) through the year, but rarely can drop to -20 °C (-3 °F) or can rise to as high as 36 °C (98 °F).The average annual precipitation amounts to about 1276 mm (50.2 inches) and receives 127 rainy days on the 1 mm (0.04 inches) threshold annually.Portland enjoys an average of 3003 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 Portland, Connecticut, United States §

The warmest months in Portland 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, Portland experiences 72 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 Portland, 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
(68°F)		 21°C
(70°F)		 24°C
(76°F)		 29°C
(84°F)		 33°C
(92°F)		 35°C
(96°F)		 36°C
(98°F)		 34°C
(94°F)		 34°C
(93°F)		 33°C
(91°F)		 24°C
(75°F)		 17°C
(63°F)
Mean maximum 14°C
(58°F)		 17°C
(63°F)		 19°C
(67°F)		 23°C
(73°F)		 30°C
(87°F)		 33°C
(91°F)		 35°C
(96°F)		 33°C
(91°F)		 31°C
(87°F)		 27°C
(81°F)		 21°C
(71°F)		 15°C
(60°F)
Average high 4°C
(39°F)		 5°C
(42°F)		 9°C
(48°F)		 14°C
(58°F)		 20°C
(68°F)		 25°C
(78°F)		 28°C
(83°F)		 28°C
(82°F)		 24°C
(76°F)		 18°C
(65°F)		 11°C
(52°F)		 6°C
(42°F)
Daily mean -0°C
(32°F)		 1°C
(34°F)		 4°C
(40°F)		 10°C
(49°F)		 15°C
(60°F)		 20°C
(69°F)		 24°C
(75°F)		 23°C
(74°F)		 20°C
(67°F)		 14°C
(58°F)		 7°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 -17°C
(2°F)		 -14°C
(7°F)		 -9°C
(15°F)		 -1°C
(30°F)		 4°C
(40°F)		 11°C
(51°F)		 15°C
(59°F)		 13°C
(55°F)		 7°C
(46°F)		 1°C
(35°F)		 -7°C
(19°F)		 -11°C
(13°F)
Minimum -20°C
(-3°F)		 -19°C
(-1°F)		 -19°C
(-2°F)		 -4°C
(26°F)		 1°C
(35°F)		 7°C
(45°F)		 13°C
(57°F)		 11°C
(53°F)		 4°C
(40°F)		 -1°C
(30°F)		 -12°C
(10°F)		 -16°C
(4°F)

Compare climate in Portland with other places

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

Monthly average precipitation in Portland, Connecticut, United States §

Portland usually has the most precipitation in July, October and December, with an average of 11 rainy days and 138 mm (5.4 inches) of precipitation per month.The driest months in Portland are January, February and March. On average, 82 mm (3.2 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Portland, 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) 67 (2.6) 89 (3.5) 90 (3.6) 126 (5.0) 111 (4.4) 94 (3.7) 156 (6.1) 96 (3.8) 99 (3.9) 130 (5.1) 90 (3.6) 127 (5.0)
Average precipitation days (≥ 1 mm) 8 10 10 13 12 11 13 11 9 11 9 10

Monthly sunshine hours in Portland, Connecticut, United States §

The sunniest months in Portland are June, July and August, when the sun shines an average of 10 hours 44 minutes a day.Least sunny months in Portland: January, February and December receive an average of 5 hours 38 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Portland, 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 151 183 257 246 282 320 342 325 283 223 208 178
Mean daily daylight hours 9h 32m 10h 36m 11h 58m 13h 21m 14h 32m 15h 7m 14h 48m 13h 45m 12h 25m 11h 2m 9h 49m 9h 12m

Solar UV radiation in Portland, Connecticut, United States §

Portland 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 Portland UV Index data.

Average daily maximum UV levels by month for Portland, 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