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Monthly climate in Winthrop, Maine, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Winthrop features a humid continental climate (Dfb).Temperatures typically range between -5 °C (23 °F) and 21 °C (71 °F) through the year, but rarely can drop to -27 °C (-16 °F) or can rise to as high as 36 °C (97 °F).The average annual precipitation amounts to about 1125 mm (44.3 inches) and receives 120 rainy days on the 1 mm (0.04 inches) threshold annually.Winthrop enjoys an average of 2875 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 Winthrop, Maine, United States §

The warmest months in Winthrop are June, July and August, with daily mean temperatures ranging from 18 to 21 °C (65 - 71 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -5 to -3 °C (23 - 27 °F) throughout the day. On average each year, Winthrop experiences 47 days above 25 °C (77.0 °F) and 124 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Winthrop, 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
(56°F)		 15°C
(60°F)		 18°C
(64°F)		 25°C
(78°F)		 31°C
(88°F)		 34°C
(94°F)		 36°C
(97°F)		 33°C
(91°F)		 30°C
(87°F)		 25°C
(77°F)		 19°C
(67°F)		 15°C
(59°F)
Mean maximum 9°C
(49°F)		 11°C
(52°F)		 14°C
(57°F)		 20°C
(67°F)		 28°C
(83°F)		 30°C
(86°F)		 32°C
(90°F)		 31°C
(89°F)		 28°C
(83°F)		 23°C
(73°F)		 17°C
(63°F)		 13°C
(56°F)
Average high -1°C
(30°F)		 0°C
(33°F)		 4°C
(40°F)		 11°C
(52°F)		 17°C
(63°F)		 23°C
(74°F)		 26°C
(79°F)		 26°C
(78°F)		 22°C
(71°F)		 15°C
(59°F)		 7°C
(44°F)		 1°C
(34°F)
Daily mean -5°C
(23°F)		 -4°C
(25°F)		 -0°C
(32°F)		 6°C
(44°F)		 13°C
(55°F)		 18°C
(65°F)		 21°C
(71°F)		 21°C
(70°F)		 17°C
(63°F)		 11°C
(52°F)		 3°C
(38°F)		 -3°C
(27°F)
Average low -9°C
(15°F)		 -9°C
(16°F)		 -5°C
(24°F)		 3°C
(37°F)		 8°C
(47°F)		 13°C
(56°F)		 17°C
(63°F)		 17°C
(62°F)		 13°C
(55°F)		 7°C
(45°F)		 -1°C
(31°F)		 -7°C
(20°F)
Mean minimum -21°C
(-5°F)		 -21°C
(-5°F)		 -16°C
(3°F)		 -3°C
(27°F)		 3°C
(37°F)		 8°C
(47°F)		 13°C
(55°F)		 11°C
(53°F)		 6°C
(43°F)		 1°C
(33°F)		 -10°C
(14°F)		 -18°C
(-1°F)
Minimum -27°C
(-16°F)		 -24°C
(-11°F)		 -19°C
(-2°F)		 -6°C
(22°F)		 1°C
(34°F)		 5°C
(42°F)		 10°C
(50°F)		 10°C
(50°F)		 2°C
(37°F)		 -2°C
(29°F)		 -16°C
(3°F)		 -25°C
(-13°F)

Compare climate in Winthrop with other places

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

Monthly average precipitation in Winthrop, Maine, United States §

Winthrop usually has the most precipitation in April, July and October, with an average of 11 rainy days and 121 mm (4.8 inches) of precipitation per month.The driest months in Winthrop are March, June and September. On average, 71 mm (2.8 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Winthrop, 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) 82 (3.2) 84 (3.3) 72 (2.8) 118 (4.6) 79 (3.1) 67 (2.6) 117 (4.6) 85 (3.3) 73 (2.9) 128 (5.1) 107 (4.2) 114 (4.5)
Average precipitation days (≥ 1 mm) 8 10 9 13 9 10 11 10 8 11 11 10

Monthly sunshine hours in Winthrop, Maine, United States §

The sunniest months in Winthrop are June, July and August, when the sun shines an average of 10 hours 25 minutes a day.Least sunny months in Winthrop: 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 Winthrop, 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 142 181 251 229 277 317 317 324 283 200 178 171
Mean daily daylight hours 9h 16m 10h 27m 11h 57m 13h 29m 14h 48m 15h 27m 15h 5m 13h 56m 12h 27m 10h 55m 9h 35m 8h 53m

Solar UV radiation in Winthrop, Maine, United States §

Winthrop 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 Winthrop UV Index data.

Average daily maximum UV levels by month for Winthrop, 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