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Monthly climate in Castine, Maine, United States

Last updated: March 2, 2024

Under the Köppen–Geiger climate classification Castine features a humid continental climate (Dfb). Temperatures typically range between -4 °C (25 °F) and 20 °C (68 °F) through the year, but rarely can drop to -23 °C (-9 °F) or can rise to as high as 31 °C (88 °F). The average annual precipitation amounts to about 1163 mm (45.8 inches) and receives 122 rainy days on the 1 mm (0.04 inches) threshold annually. Castine enjoys an average of 2910 hours of sunshine throughout the year, and daylight varies from 8 hours 53 minutes to 15 hours 27 minutes per day.

Monthly average temperatures in Castine, Maine, United States §

The warmest months in Castine are June, July and August, with daily mean temperatures ranging from 16 to 20 °C (62 - 68 °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, Castine experiences 20 days above 25 °C (77.0 °F) and 112 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Castine, 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 12°C
(53°F)		 15°C
(59°F)		 14°C
(58°F)		 20°C
(68°F)		 28°C
(82°F)		 30°C
(87°F)		 30°C
(87°F)		 31°C
(88°F)		 27°C
(81°F)		 22°C
(72°F)		 18°C
(65°F)		 15°C
(59°F)
Mean maximum 10°C
(49°F)		 10°C
(50°F)		 11°C
(52°F)		 16°C
(61°F)		 25°C
(77°F)		 27°C
(80°F)		 29°C
(84°F)		 29°C
(84°F)		 26°C
(79°F)		 21°C
(70°F)		 17°C
(62°F)		 13°C
(56°F)
Average high -0°C
(32°F)		 1°C
(33°F)		 4°C
(39°F)		 9°C
(49°F)		 15°C
(59°F)		 20°C
(69°F)		 23°C
(74°F)		 24°C
(75°F)		 20°C
(68°F)		 14°C
(58°F)		 7°C
(45°F)		 2°C
(35°F)
Daily mean -4°C
(25°F)		 -3°C
(26°F)		 -0°C
(32°F)		 6°C
(43°F)		 11°C
(52°F)		 16°C
(62°F)		 19°C
(67°F)		 20°C
(68°F)		 16°C
(61°F)		 11°C
(52°F)		 4°C
(39°F)		 -2°C
(29°F)
Average low -8°C
(18°F)		 -8°C
(19°F)		 -4°C
(26°F)		 3°C
(37°F)		 7°C
(45°F)		 12°C
(54°F)		 16°C
(61°F)		 16°C
(61°F)		 13°C
(55°F)		 8°C
(46°F)		 1°C
(33°F)		 -5°C
(23°F)
Mean minimum -19°C
(-2°F)		 -18°C
(-1°F)		 -15°C
(5°F)		 -3°C
(27°F)		 3°C
(37°F)		 8°C
(46°F)		 12°C
(53°F)		 12°C
(53°F)		 7°C
(45°F)		 2°C
(36°F)		 -9°C
(17°F)		 -15°C
(5°F)
Minimum -23°C
(-9°F)		 -21°C
(-6°F)		 -18°C
(0°F)		 -5°C
(24°F)		 2°C
(35°F)		 5°C
(41°F)		 10°C
(50°F)		 11°C
(51°F)		 4°C
(40°F)		 -1°C
(31°F)		 -15°C
(6°F)		 -22°C
(-7°F)

Compare climate in Castine with other places

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

Monthly average precipitation in Castine, Maine, United States §

Castine usually has the most precipitation in April, November and December, with an average of 11 rainy days and 128 mm (5.1 inches) of precipitation per month. The driest months in Castine are March, June and August. On average, 73 mm (2.9 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Castine, 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) 93 (3.7) 88 (3.5) 71 (2.8) 130 (5.1) 89 (3.5) 75 (3.0) 86 (3.4) 71 (2.8) 83 (3.3) 121 (4.8) 122 (4.8) 133 (5.2)
Average precipitation days (≥ 1 mm) 9 10 9 12 11 10 10 9 8 12 11 11

Monthly sunshine hours in Castine, Maine, United States §

The sunniest months in Castine are June, July and August, when the sun shines an average of 10 hours 24 minutes a day. Least sunny months in Castine: January, November and December receive an average of 5 hours 21 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Castine, 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 142 187 255 237 286 316 315 325 277 215 180 169
Mean daily daylight hours 9h 16m 10h 27m 11h 57m 13h 29m 14h 48m 15h 27m 15h 6m 13h 56m 12h 27m 10h 55m 9h 34m 8h 53m

Solar UV radiation in Castine, Maine, United States §

Castine experiences the highest level of ultraviolet (UV) radiation in May, June and July, when the maximum UV index can reach values of 9 - 9, 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 Castine UV Index data.

Average daily maximum UV levels by month for Castine, 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 9 9 8 7 5 3 2

Detailed Monthly Weather Insights for Castine, Maine, United States

Discover in-depth weather details for every month in Castine. Click through the links below for comprehensive overviews of temperature trends, precipitation levels, sunshine hours, and solar UV radiation specifics. Whether planning a visit or simply curious about Castine's climate nuances, these monthly breakdowns provide the information you need for an informed understanding of what to expect throughout the year.

Each link leads to a detailed account of the typical weather conditions for that month, providing both locals and tourists with vital information to plan their daily activities, wardrobe, and travel itineraries accordingly.