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Monthly climate in Brunswick, Maine, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Brunswick features a humid continental climate (Dfb).Temperatures typically range between -4 °C (25 °F) and 21 °C (70 °F) through the year, but rarely can drop to -23 °C (-10 °F) or can rise to as high as 34 °C (94 °F).The average annual precipitation amounts to about 1134 mm (44.6 inches) and receives 117 rainy days on the 1 mm (0.04 inches) threshold annually.Brunswick enjoys an average of 2963 hours of sunshine throughout the year, and daylight varies from 8 hours 56 minutes to 15 hours 24 minutes per day.

Monthly average temperatures in Brunswick, Maine, United States §

The warmest months in Brunswick are June, July and August, with daily mean temperatures ranging from 18 to 21 °C (65 - 70 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -4 to -2 °C (25 - 29 °F) throughout the day. On average each year, Brunswick experiences 42 days above 25 °C (77.0 °F) and 115 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Brunswick, Maine, 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 13°C
(56°F)		 16°C
(62°F)		 18°C
(65°F)		 26°C
(79°F)		 31°C
(88°F)		 34°C
(94°F)		 34°C
(94°F)		 33°C
(91°F)		 31°C
(87°F)		 26°C
(79°F)		 20°C
(69°F)		 15°C
(59°F)
Mean maximum 10°C
(51°F)		 12°C
(53°F)		 14°C
(57°F)		 19°C
(67°F)		 28°C
(82°F)		 29°C
(84°F)		 32°C
(90°F)		 31°C
(88°F)		 28°C
(83°F)		 23°C
(74°F)		 18°C
(64°F)		 13°C
(56°F)
Average high 0°C
(32°F)		 1°C
(35°F)		 5°C
(41°F)		 11°C
(52°F)		 17°C
(63°F)		 23°C
(73°F)		 26°C
(78°F)		 26°C
(78°F)		 22°C
(71°F)		 15°C
(60°F)		 8°C
(46°F)		 2°C
(36°F)
Daily mean -4°C
(25°F)		 -3°C
(27°F)		 0°C
(33°F)		 7°C
(44°F)		 12°C
(55°F)		 18°C
(65°F)		 21°C
(70°F)		 21°C
(70°F)		 17°C
(63°F)		 11°C
(53°F)		 4°C
(39°F)		 -2°C
(29°F)
Average low -8°C
(18°F)		 -8°C
(19°F)		 -3°C
(26°F)		 3°C
(38°F)		 8°C
(47°F)		 14°C
(57°F)		 17°C
(63°F)		 17°C
(63°F)		 13°C
(56°F)		 8°C
(46°F)		 0°C
(33°F)		 -5°C
(23°F)
Mean minimum -19°C
(-2°F)		 -19°C
(-1°F)		 -15°C
(6°F)		 -2°C
(28°F)		 3°C
(37°F)		 8°C
(47°F)		 13°C
(55°F)		 12°C
(54°F)		 7°C
(45°F)		 1°C
(34°F)		 -9°C
(16°F)		 -16°C
(4°F)
Minimum -23°C
(-10°F)		 -22°C
(-7°F)		 -17°C
(2°F)		 -4°C
(24°F)		 1°C
(34°F)		 5°C
(41°F)		 9°C
(49°F)		 11°C
(51°F)		 3°C
(38°F)		 -1°C
(30°F)		 -14°C
(6°F)		 -23°C
(-9°F)

Compare climate in Brunswick with other places

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

Monthly average precipitation in Brunswick, Maine, United States §

Brunswick usually has the most precipitation in April, October and December, with an average of 11 rainy days and 123 mm (4.8 inches) of precipitation per month.The driest months in Brunswick are March, June and September. On average, 70 mm (2.7 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Brunswick, Maine, 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) 83 (3.3) 87 (3.4) 73 (2.9) 118 (4.7) 78 (3.1) 66 (2.6) 117 (4.6) 77 (3.0) 70 (2.8) 131 (5.1) 114 (4.5) 120 (4.7)
Average precipitation days (≥ 1 mm) 8 10 8 12 10 9 11 9 8 11 11 10

Monthly sunshine hours in Brunswick, Maine, United States §

The sunniest months in Brunswick are June, July and August, when the sun shines an average of 10 hours 43 minutes a day.Least sunny months in Brunswick: 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 Brunswick, Maine, 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 146 184 256 240 289 325 327 334 286 211 186 174
Mean daily daylight hours 9h 18m 10h 29m 11h 57m 13h 28m 14h 45m 15h 24m 15h 3m 13h 54m 12h 27m 10h 56m 9h 37m 8h 56m

Solar UV radiation in Brunswick, Maine, United States §

Brunswick experiences the highest level of ultraviolet (UV) radiation in May, June and July, 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 3. For more detailed information, check out our hourly Brunswick UV Index data.

Average daily maximum UV levels by month for Brunswick, Maine, 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) 2 4 5 7 9 10 9 8 7 5 3 2