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Monthly climate in Casco, Maine, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Casco features a humid continental climate (Dfb).Temperatures typically range between -5 °C (23 °F) and 22 °C (72 °F) through the year, but rarely can drop to -25 °C (-13 °F) or can rise to as high as 35 °C (96 °F).The average annual precipitation amounts to about 1104 mm (43.5 inches) and receives 117 rainy days on the 1 mm (0.04 inches) threshold annually.Casco enjoys an average of 2915 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 Casco, Maine, United States §

The warmest months in Casco are June, July and August, with daily mean temperatures ranging from 19 to 22 °C (66 - 72 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -5 to -2 °C (23 - 28 °F) throughout the day. On average each year, Casco experiences 49 days above 25 °C (77.0 °F) and 121 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Casco, 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
(55°F)		 14°C
(57°F)		 20°C
(67°F)		 27°C
(82°F)		 31°C
(88°F)		 34°C
(93°F)		 35°C
(96°F)		 33°C
(91°F)		 31°C
(87°F)		 25°C
(77°F)		 20°C
(69°F)		 15°C
(59°F)
Mean maximum 9°C
(48°F)		 11°C
(52°F)		 15°C
(58°F)		 20°C
(68°F)		 28°C
(83°F)		 30°C
(86°F)		 32°C
(90°F)		 31°C
(88°F)		 29°C
(84°F)		 23°C
(75°F)		 18°C
(64°F)		 13°C
(56°F)
Average high -1°C
(31°F)		 1°C
(34°F)		 4°C
(40°F)		 11°C
(51°F)		 17°C
(63°F)		 23°C
(74°F)		 26°C
(80°F)		 26°C
(79°F)		 22°C
(72°F)		 15°C
(60°F)		 7°C
(45°F)		 2°C
(35°F)
Daily mean -5°C
(23°F)		 -4°C
(25°F)		 -0°C
(32°F)		 6°C
(43°F)		 12°C
(54°F)		 19°C
(66°F)		 22°C
(72°F)		 21°C
(71°F)		 17°C
(64°F)		 11°C
(52°F)		 4°C
(39°F)		 -2°C
(28°F)
Average low -9°C
(16°F)		 -9°C
(17°F)		 -4°C
(24°F)		 3°C
(37°F)		 8°C
(47°F)		 14°C
(57°F)		 18°C
(64°F)		 17°C
(64°F)		 13°C
(57°F)		 8°C
(46°F)		 0°C
(33°F)		 -6°C
(22°F)
Mean minimum -20°C
(-4°F)		 -20°C
(-4°F)		 -16°C
(4°F)		 -3°C
(28°F)		 3°C
(37°F)		 8°C
(47°F)		 13°C
(56°F)		 12°C
(54°F)		 7°C
(45°F)		 1°C
(35°F)		 -8°C
(17°F)		 -18°C
(-0°F)
Minimum -25°C
(-13°F)		 -24°C
(-10°F)		 -18°C
(1°F)		 -4°C
(24°F)		 1°C
(34°F)		 5°C
(42°F)		 11°C
(52°F)		 11°C
(52°F)		 4°C
(39°F)		 -1°C
(31°F)		 -14°C
(8°F)		 -25°C
(-12°F)

Compare climate in Casco with other places

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

Monthly average precipitation in Casco, Maine, United States §

Casco usually has the most precipitation in April, July and October, with an average of 11 rainy days and 123 mm (4.8 inches) of precipitation per month.The driest months in Casco are March, June and September. On average, 69 mm (2.7 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Casco, 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) 79 (3.1) 85 (3.3) 72 (2.9) 112 (4.4) 74 (2.9) 73 (2.9) 139 (5.5) 79 (3.1) 62 (2.4) 117 (4.6) 102 (4.0) 110 (4.3)
Average precipitation days (≥ 1 mm) 8 10 8 12 9 10 11 10 7 11 11 10

Monthly sunshine hours in Casco, Maine, United States §

The sunniest months in Casco are June, July and August, when the sun shines an average of 10 hours 36 minutes a day.Least sunny months in Casco: January, February and December receive an average of 5 hours 25 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Casco, 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 143 179 253 234 282 322 324 329 285 204 184 171
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 36m 8h 55m

Solar UV radiation in Casco, Maine, United States §

Casco 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 Casco UV Index data.

Average daily maximum UV levels by month for Casco, 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 8 9 10 9 8 7 5 3 2