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Monthly climate in Deer Isle, Maine, United States

Last updated: March 2, 2024

Under the Köppen–Geiger climate classification Deer Isle features a humid continental climate (Dfb). Temperatures typically range between -2 °C (29 °F) and 18 °C (64 °F) through the year, but rarely can drop to -17 °C (2 °F) or can rise to as high as 23 °C (73 °F). The average annual precipitation amounts to about 1363 mm (53.7 inches) and receives 124 rainy days on the 1 mm (0.04 inches) threshold annually. Deer Isle enjoys an average of 2910 hours of sunshine throughout the year, and daylight varies from 8 hours 54 minutes to 15 hours 25 minutes per day.

Monthly average temperatures in Deer Isle, Maine, United States §

The warmest months in Deer Isle are July, August and September, with daily mean temperatures ranging from 16 to 18 °C (60 - 64 °F) throughout the day. The coldest temperatures usually occur in January, February and March, when daily mean temperatures range from -2 to 0 °C (29 - 33 °F) throughout the day. On average each year, Deer Isle experiences 0 days above 25 °C (77.0 °F) and 85 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Deer Isle, 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 10°C
(50°F)		 9°C
(49°F)		 10°C
(50°F)		 14°C
(57°F)		 17°C
(64°F)		 20°C
(69°F)		 22°C
(72°F)		 23°C
(73°F)		 22°C
(72°F)		 18°C
(65°F)		 16°C
(62°F)		 13°C
(56°F)
Mean maximum 9°C
(48°F)		 7°C
(45°F)		 8°C
(46°F)		 10°C
(51°F)		 16°C
(61°F)		 18°C
(65°F)		 20°C
(69°F)		 22°C
(71°F)		 20°C
(68°F)		 17°C
(64°F)		 15°C
(59°F)		 12°C
(54°F)
Average high 1°C
(35°F)		 2°C
(35°F)		 3°C
(37°F)		 7°C
(44°F)		 11°C
(51°F)		 15°C
(59°F)		 17°C
(64°F)		 19°C
(66°F)		 17°C
(63°F)		 14°C
(57°F)		 8°C
(47°F)		 4°C
(39°F)
Daily mean -2°C
(29°F)		 -1°C
(30°F)		 0°C
(33°F)		 5°C
(41°F)		 9°C
(49°F)		 13°C
(56°F)		 16°C
(62°F)		 18°C
(64°F)		 16°C
(60°F)		 12°C
(54°F)		 6°C
(43°F)		 1°C
(34°F)
Average low -5°C
(24°F)		 -4°C
(25°F)		 -2°C
(29°F)		 3°C
(38°F)		 8°C
(46°F)		 12°C
(54°F)		 15°C
(60°F)		 17°C
(62°F)		 15°C
(59°F)		 11°C
(51°F)		 4°C
(39°F)		 -2°C
(29°F)
Mean minimum -14°C
(6°F)		 -13°C
(8°F)		 -12°C
(11°F)		 -1°C
(30°F)		 4°C
(40°F)		 9°C
(48°F)		 13°C
(55°F)		 14°C
(58°F)		 11°C
(52°F)		 5°C
(42°F)		 -5°C
(24°F)		 -11°C
(13°F)
Minimum -17°C
(2°F)		 -15°C
(6°F)		 -15°C
(6°F)		 -3°C
(27°F)		 2°C
(37°F)		 8°C
(46°F)		 12°C
(54°F)		 13°C
(57°F)		 9°C
(48°F)		 2°C
(35°F)		 -11°C
(13°F)		 -17°C
(2°F)

Compare climate in Deer Isle with other places

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

Monthly average precipitation in Deer Isle, Maine, United States §

Deer Isle usually has the most precipitation in April, October and December, with an average of 12 rainy days and 152 mm (6.0 inches) of precipitation per month. The driest months in Deer Isle are March, June and August. On average, 86 mm (3.4 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Deer Isle, 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) 108 (4.3) 105 (4.1) 84 (3.3) 157 (6.2) 105 (4.1) 87 (3.4) 92 (3.6) 86 (3.4) 102 (4.0) 145 (5.7) 138 (5.4) 155 (6.1)
Average precipitation days (≥ 1 mm) 9 11 9 13 11 9 10 8 8 12 12 12

Monthly sunshine hours in Deer Isle, Maine, United States §

The sunniest months in Deer Isle are June, July and August, when the sun shines an average of 10 hours 24 minutes a day. Least sunny months in Deer Isle: 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 Deer Isle, 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 17m 10h 28m 11h 57m 13h 29m 14h 46m 15h 25m 15h 4m 13h 55m 12h 27m 10h 56m 9h 36m 8h 54m

Solar UV radiation in Deer Isle, Maine, United States §

Deer Isle 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 Deer Isle UV Index data.

Average daily maximum UV levels by month for Deer Isle, 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 Deer Isle, Maine, United States

Discover in-depth weather details for every month in Deer Isle. 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 Deer Isle'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.