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Monthly climate in Thomaston, Maine, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Thomaston features a humid continental climate (Dfb).Temperatures typically range between -2 °C (28 °F) and 20 °C (68 °F) through the year, but rarely can drop to -20 °C (-4 °F) or can rise to as high as 31 °C (89 °F).The average annual precipitation amounts to about 1198 mm (47.2 inches) and receives 119 rainy days on the 1 mm (0.04 inches) threshold annually.Thomaston enjoys an average of 2985 hours of sunshine throughout the year, and daylight varies from 8 hours 55 minutes to 15 hours 25 minutes per day.

Monthly average temperatures in Thomaston, Maine, United States §

The warmest months in Thomaston are July, August and September, 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 -2 to 0 °C (28 - 32 °F) throughout the day. On average each year, Thomaston experiences 19 days above 25 °C (77.0 °F) and 100 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Thomaston, 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)		 14°C
(57°F)		 21°C
(70°F)		 26°C
(80°F)		 31°C
(87°F)		 31°C
(89°F)		 31°C
(88°F)		 29°C
(84°F)		 23°C
(74°F)		 18°C
(65°F)		 15°C
(60°F)
Mean maximum 11°C
(52°F)		 11°C
(52°F)		 11°C
(53°F)		 16°C
(61°F)		 24°C
(76°F)		 26°C
(79°F)		 29°C
(85°F)		 29°C
(84°F)		 26°C
(79°F)		 21°C
(71°F)		 17°C
(63°F)		 14°C
(57°F)
Average high 1°C
(34°F)		 2°C
(36°F)		 4°C
(40°F)		 10°C
(50°F)		 15°C
(59°F)		 20°C
(69°F)		 23°C
(74°F)		 24°C
(75°F)		 20°C
(69°F)		 15°C
(59°F)		 8°C
(47°F)		 3°C
(38°F)
Daily mean -2°C
(28°F)		 -2°C
(29°F)		 1°C
(34°F)		 6°C
(44°F)		 11°C
(53°F)		 17°C
(62°F)		 20°C
(68°F)		 20°C
(68°F)		 17°C
(62°F)		 12°C
(53°F)		 5°C
(41°F)		 -0°C
(32°F)
Average low -6°C
(22°F)		 -5°C
(23°F)		 -2°C
(28°F)		 3°C
(38°F)		 8°C
(46°F)		 13°C
(55°F)		 16°C
(62°F)		 17°C
(62°F)		 14°C
(57°F)		 9°C
(48°F)		 2°C
(35°F)		 -3°C
(26°F)
Mean minimum -16°C
(3°F)		 -16°C
(4°F)		 -13°C
(9°F)		 -2°C
(29°F)		 3°C
(38°F)		 8°C
(47°F)		 12°C
(54°F)		 12°C
(54°F)		 8°C
(47°F)		 2°C
(37°F)		 -8°C
(18°F)		 -13°C
(9°F)
Minimum -20°C
(-4°F)		 -18°C
(-1°F)		 -15°C
(5°F)		 -4°C
(25°F)		 2°C
(36°F)		 6°C
(42°F)		 11°C
(51°F)		 11°C
(53°F)		 6°C
(43°F)		 -0°C
(32°F)		 -14°C
(7°F)		 -20°C
(-4°F)

Compare climate in Thomaston with other places

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

Monthly average precipitation in Thomaston, Maine, United States §

Thomaston usually has the most precipitation in April, October and December, with an average of 12 rainy days and 131 mm (5.2 inches) of precipitation per month.The driest months in Thomaston are March, June and August. On average, 77 mm (3.0 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Thomaston, 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) 94 (3.7) 96 (3.8) 78 (3.1) 133 (5.2) 83 (3.3) 72 (2.8) 101 (4.0) 80 (3.1) 85 (3.3) 133 (5.2) 116 (4.6) 127 (5.0)
Average precipitation days (≥ 1 mm) 8 10 8 13 12 9 10 8 7 12 11 11

Monthly sunshine hours in Thomaston, Maine, United States §

The sunniest months in Thomaston are June, July and August, when the sun shines an average of 10 hours 44 minutes a day.Least sunny months in Thomaston: January, November and December receive an average of 5 hours 29 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Thomaston, 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 144 188 259 244 294 326 326 335 283 222 186 172
Mean daily daylight hours 9h 17m 10h 28m 11h 57m 13h 28m 14h 46m 15h 25m 15h 4m 13h 54m 12h 27m 10h 56m 9h 36m 8h 55m

Solar UV radiation in Thomaston, Maine, United States §

Thomaston 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 Thomaston UV Index data.

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