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Monthly climate in Calais, Maine, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Calais features a humid continental climate (Dfb).Temperatures typically range between -6 °C (22 °F) and 20 °C (68 °F) through the year, but rarely can drop to -28 °C (-17 °F) or can rise to as high as 35 °C (95 °F).The average annual precipitation amounts to about 1200 mm (47.2 inches) and receives 126 rainy days on the 1 mm (0.04 inches) threshold annually.Calais enjoys an average of 2872 hours of sunshine throughout the year, and daylight varies from 8 hours 47 minutes to 15 hours 33 minutes per day.

Monthly average temperatures in Calais, Maine, United States §

The warmest months in Calais are June, July and August, with daily mean temperatures ranging from 17 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 -6 to -3 °C (22 - 26 °F) throughout the day. On average each year, Calais experiences 43 days above 25 °C (77.0 °F) and 133 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Calais, 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
(54°F)		 16°C
(61°F)		 16°C
(61°F)		 22°C
(71°F)		 32°C
(90°F)		 35°C
(95°F)		 35°C
(94°F)		 33°C
(92°F)		 32°C
(89°F)		 25°C
(77°F)		 22°C
(72°F)		 15°C
(59°F)
Mean maximum 9°C
(48°F)		 10°C
(50°F)		 12°C
(53°F)		 18°C
(65°F)		 28°C
(83°F)		 29°C
(85°F)		 32°C
(89°F)		 31°C
(89°F)		 28°C
(83°F)		 22°C
(72°F)		 18°C
(64°F)		 13°C
(55°F)
Average high -1°C
(30°F)		 -0°C
(32°F)		 3°C
(38°F)		 10°C
(50°F)		 17°C
(63°F)		 22°C
(72°F)		 25°C
(78°F)		 26°C
(78°F)		 21°C
(70°F)		 14°C
(58°F)		 7°C
(44°F)		 1°C
(33°F)
Daily mean -6°C
(22°F)		 -5°C
(23°F)		 -1°C
(30°F)		 5°C
(42°F)		 11°C
(53°F)		 17°C
(62°F)		 20°C
(68°F)		 20°C
(68°F)		 16°C
(61°F)		 10°C
(50°F)		 3°C
(37°F)		 -3°C
(26°F)
Average low -10°C
(14°F)		 -10°C
(14°F)		 -6°C
(22°F)		 1°C
(35°F)		 6°C
(43°F)		 11°C
(52°F)		 15°C
(60°F)		 15°C
(59°F)		 11°C
(52°F)		 6°C
(43°F)		 -1°C
(30°F)		 -7°C
(19°F)
Mean minimum -21°C
(-6°F)		 -21°C
(-6°F)		 -17°C
(2°F)		 -4°C
(25°F)		 1°C
(34°F)		 5°C
(41°F)		 10°C
(50°F)		 9°C
(49°F)		 4°C
(40°F)		 -1°C
(30°F)		 -10°C
(14°F)		 -17°C
(1°F)
Minimum -28°C
(-17°F)		 -24°C
(-11°F)		 -21°C
(-5°F)		 -7°C
(19°F)		 -1°C
(31°F)		 2°C
(36°F)		 10°C
(50°F)		 8°C
(46°F)		 1°C
(34°F)		 -5°C
(23°F)		 -16°C
(4°F)		 -23°C
(-9°F)

Compare climate in Calais with other places

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

Monthly average precipitation in Calais, Maine, United States §

Calais usually has the most precipitation in April, November and December, with an average of 12 rainy days and 126 mm (4.9 inches) of precipitation per month.The driest months in Calais are March, August and September. On average, 79 mm (3.1 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Calais, 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) 98 (3.9) 90 (3.5) 72 (2.8) 119 (4.7) 107 (4.2) 91 (3.6) 91 (3.6) 76 (3.0) 88 (3.5) 109 (4.3) 136 (5.4) 122 (4.8)
Average precipitation days (≥ 1 mm) 8 11 9 13 12 10 12 9 8 11 12 11

Monthly sunshine hours in Calais, Maine, United States §

The sunniest months in Calais are June, July and August, when the sun shines an average of 10 hours 20 minutes a day.Least sunny months in Calais: January, November and December receive an average of 5 hours 7 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Calais, 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 135 190 246 232 289 311 316 323 275 216 171 162
Mean daily daylight hours 9h 11m 10h 24m 11h 57m 13h 32m 14h 53m 15h 33m 15h 11m 13h 59m 12h 28m 10h 53m 9h 30m 8h 47m

Solar UV radiation in Calais, Maine, United States §

Calais experiences the highest level of ultraviolet (UV) radiation in May, June and August, when the maximum UV index can reach values of 8 - 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 Calais UV Index data.

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