nomadseason

Monthly climate in Boothbay Harbor, Maine, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Boothbay Harbor features a humid continental climate (Dfb).Temperatures typically range between -1 °C (31 °F) and 20 °C (67 °F) through the year, but rarely can drop to -17 °C (2 °F) or can rise to as high as 25 °C (78 °F).The average annual precipitation amounts to about 1231 mm (48.5 inches) and receives 119 rainy days on the 1 mm (0.04 inches) threshold annually.Boothbay Harbor enjoys an average of 3041 hours of sunshine throughout the year, and daylight varies from 8 hours 57 minutes to 15 hours 23 minutes per day.

Monthly average temperatures in Boothbay Harbor, Maine, United States §

The warmest months in Boothbay Harbor are July, August and September, with daily mean temperatures ranging from 17 to 20 °C (62 - 67 °F) throughout the day. The coldest temperatures usually occur in January, February and March, when daily mean temperatures range from -1 to 1 °C (31 - 35 °F) throughout the day. On average each year, Boothbay Harbor experiences 0 days above 25 °C (77.0 °F) and 75 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Boothbay Harbor, 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 11°C
(52°F)		 11°C
(53°F)		 12°C
(53°F)		 15°C
(60°F)		 19°C
(66°F)		 21°C
(71°F)		 25°C
(78°F)		 25°C
(78°F)		 23°C
(74°F)		 19°C
(67°F)		 17°C
(63°F)		 14°C
(57°F)
Mean maximum 10°C
(50°F)		 9°C
(48°F)		 10°C
(49°F)		 12°C
(54°F)		 17°C
(63°F)		 20°C
(68°F)		 23°C
(74°F)		 24°C
(75°F)		 21°C
(70°F)		 19°C
(66°F)		 16°C
(60°F)		 13°C
(55°F)
Average high 2°C
(36°F)		 3°C
(37°F)		 4°C
(39°F)		 8°C
(46°F)		 12°C
(53°F)		 16°C
(61°F)		 20°C
(68°F)		 21°C
(69°F)		 18°C
(65°F)		 14°C
(58°F)		 9°C
(48°F)		 4°C
(40°F)
Daily mean -1°C
(31°F)		 -0°C
(31°F)		 1°C
(35°F)		 6°C
(43°F)		 10°C
(50°F)		 15°C
(59°F)		 19°C
(66°F)		 20°C
(67°F)		 17°C
(62°F)		 12°C
(55°F)		 6°C
(44°F)		 1°C
(35°F)
Average low -4°C
(26°F)		 -3°C
(26°F)		 -1°C
(31°F)		 4°C
(40°F)		 9°C
(48°F)		 14°C
(57°F)		 18°C
(64°F)		 18°C
(66°F)		 15°C
(60°F)		 11°C
(52°F)		 4°C
(39°F)		 -1°C
(30°F)
Mean minimum -14°C
(7°F)		 -13°C
(10°F)		 -10°C
(13°F)		 -0°C
(32°F)		 5°C
(41°F)		 10°C
(50°F)		 15°C
(59°F)		 15°C
(60°F)		 11°C
(52°F)		 5°C
(42°F)		 -5°C
(24°F)		 -10°C
(14°F)
Minimum -17°C
(2°F)		 -14°C
(7°F)		 -13°C
(9°F)		 -2°C
(29°F)		 2°C
(37°F)		 9°C
(49°F)		 13°C
(56°F)		 15°C
(59°F)		 9°C
(48°F)		 2°C
(36°F)		 -10°C
(14°F)		 -16°C
(3°F)

Compare climate in Boothbay Harbor with other places

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

Monthly average precipitation in Boothbay Harbor, Maine, United States §

Boothbay Harbor usually has the most precipitation in April, October and December, with an average of 12 rainy days and 142 mm (5.6 inches) of precipitation per month.The driest months in Boothbay Harbor are June, August and September. On average, 75 mm (2.9 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Boothbay Harbor, 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) 96 (3.8) 98 (3.8) 85 (3.3) 139 (5.5) 82 (3.2) 71 (2.8) 100 (3.9) 71 (2.8) 81 (3.2) 150 (5.9) 122 (4.8) 137 (5.4)
Average precipitation days (≥ 1 mm) 9 10 9 13 10 8 10 8 8 12 11 11

Monthly sunshine hours in Boothbay Harbor, Maine, United States §

The sunniest months in Boothbay Harbor are June, July and August, when the sun shines an average of 11 hours 0 minutes a day.Least sunny months in Boothbay Harbor: January, February and December receive an average of 5 hours 34 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Boothbay Harbor, 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 145 187 261 250 302 333 337 341 287 229 192 173
Mean daily daylight hours 9h 19m 10h 29m 11h 57m 13h 28m 14h 45m 15h 23m 15h 2m 13h 54m 12h 27m 10h 56m 9h 37m 8h 57m

Solar UV radiation in Boothbay Harbor, Maine, United States §

Boothbay Harbor 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 Boothbay Harbor UV Index data.

Average daily maximum UV levels by month for Boothbay Harbor, 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