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Monthly climate in Bristol, Maine, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Bristol features a humid continental climate (Dfb).Temperatures typically range between -3 °C (27 °F) and 21 °C (71 °F) through the year, but rarely can drop to -23 °C (-9 °F) or can rise to as high as 35 °C (96 °F).The average annual precipitation amounts to about 1127 mm (44.4 inches) and receives 116 rainy days on the 1 mm (0.04 inches) threshold annually.Bristol enjoys an average of 2990 hours of sunshine throughout the year, and daylight varies from 8 hours 55 minutes to 15 hours 24 minutes per day.

Monthly average temperatures in Bristol, Maine, United States §

The warmest months in Bristol are June, July and August, with daily mean temperatures ranging from 18 to 21 °C (65 - 71 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -3 to -1 °C (27 - 31 °F) throughout the day. On average each year, Bristol experiences 46 days above 25 °C (77.0 °F) and 110 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Bristol, 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)		 17°C
(64°F)		 17°C
(63°F)		 25°C
(78°F)		 31°C
(87°F)		 35°C
(96°F)		 35°C
(95°F)		 34°C
(94°F)		 32°C
(89°F)		 25°C
(78°F)		 20°C
(68°F)		 16°C
(60°F)
Mean maximum 11°C
(52°F)		 12°C
(54°F)		 13°C
(56°F)		 19°C
(66°F)		 28°C
(82°F)		 29°C
(85°F)		 33°C
(92°F)		 32°C
(90°F)		 29°C
(84°F)		 23°C
(73°F)		 18°C
(65°F)		 14°C
(58°F)
Average high 1°C
(34°F)		 2°C
(36°F)		 5°C
(41°F)		 11°C
(52°F)		 17°C
(62°F)		 23°C
(74°F)		 26°C
(79°F)		 26°C
(79°F)		 22°C
(72°F)		 15°C
(60°F)		 8°C
(47°F)		 3°C
(37°F)
Daily mean -3°C
(27°F)		 -2°C
(28°F)		 1°C
(34°F)		 7°C
(44°F)		 12°C
(54°F)		 18°C
(65°F)		 21°C
(71°F)		 21°C
(71°F)		 17°C
(63°F)		 11°C
(53°F)		 4°C
(40°F)		 -1°C
(31°F)
Average low -7°C
(20°F)		 -7°C
(20°F)		 -3°C
(27°F)		 3°C
(38°F)		 8°C
(46°F)		 13°C
(56°F)		 17°C
(63°F)		 17°C
(63°F)		 13°C
(56°F)		 8°C
(46°F)		 1°C
(33°F)		 -5°C
(24°F)
Mean minimum -18°C
(-0°F)		 -18°C
(-0°F)		 -14°C
(7°F)		 -2°C
(28°F)		 3°C
(37°F)		 8°C
(47°F)		 12°C
(54°F)		 12°C
(53°F)		 6°C
(44°F)		 1°C
(34°F)		 -9°C
(16°F)		 -15°C
(5°F)
Minimum -23°C
(-9°F)		 -21°C
(-6°F)		 -17°C
(2°F)		 -4°C
(24°F)		 2°C
(35°F)		 5°C
(40°F)		 9°C
(48°F)		 10°C
(50°F)		 3°C
(38°F)		 -1°C
(30°F)		 -14°C
(6°F)		 -22°C
(-8°F)

Compare climate in Bristol with other places

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

Monthly average precipitation in Bristol, Maine, United States §

Bristol usually has the most precipitation in April, October and December, with an average of 11 rainy days and 123 mm (4.9 inches) of precipitation per month.The driest months in Bristol are March, May and June. On average, 71 mm (2.8 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Bristol, 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) 87 (3.4) 88 (3.5) 73 (2.9) 122 (4.8) 75 (2.9) 65 (2.6) 105 (4.1) 76 (3.0) 76 (3.0) 128 (5.0) 111 (4.4) 120 (4.7)
Average precipitation days (≥ 1 mm) 8 10 8 13 11 9 10 8 7 11 11 10

Monthly sunshine hours in Bristol, Maine, United States §

The sunniest months in Bristol are June, July and August, when the sun shines an average of 10 hours 47 minutes a day.Least sunny months in Bristol: January, November and December receive an average of 5 hours 31 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Bristol, 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 146 187 259 243 293 328 328 336 286 218 187 174
Mean daily daylight hours 9h 18m 10h 28m 11h 57m 13h 28m 14h 46m 15h 24m 15h 3m 13h 54m 12h 27m 10h 56m 9h 37m 8h 55m

Solar UV radiation in Bristol, Maine, United States §

Bristol 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 Bristol UV Index data.

Average daily maximum UV levels by month for Bristol, 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