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Monthly climate in Waterville, Maine, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Waterville features a humid continental climate (Dfb).Temperatures typically range between -6 °C (22 °F) and 21 °C (70 °F) through the year, but rarely can drop to -26 °C (-14 °F) or can rise to as high as 33 °C (92 °F).The average annual precipitation amounts to about 1093 mm (43.0 inches) and receives 118 rainy days on the 1 mm (0.04 inches) threshold annually.Waterville enjoys an average of 2920 hours of sunshine throughout the year, and daylight varies from 8 hours 52 minutes to 15 hours 28 minutes per day.

Monthly average temperatures in Waterville, Maine, United States §

The warmest months in Waterville are June, July and August, with daily mean temperatures ranging from 18 to 21 °C (65 - 70 °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 - 27 °F) throughout the day. On average each year, Waterville experiences 44 days above 25 °C (77.0 °F) and 125 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Waterville, 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)		 15°C
(59°F)		 17°C
(63°F)		 25°C
(77°F)		 31°C
(88°F)		 33°C
(92°F)		 33°C
(92°F)		 32°C
(90°F)		 30°C
(86°F)		 24°C
(75°F)		 19°C
(66°F)		 15°C
(59°F)
Mean maximum 9°C
(48°F)		 11°C
(52°F)		 13°C
(55°F)		 19°C
(67°F)		 28°C
(82°F)		 29°C
(85°F)		 31°C
(89°F)		 31°C
(89°F)		 28°C
(82°F)		 22°C
(72°F)		 17°C
(63°F)		 13°C
(55°F)
Average high -1°C
(30°F)		 0°C
(33°F)		 4°C
(39°F)		 10°C
(51°F)		 17°C
(63°F)		 23°C
(73°F)		 26°C
(78°F)		 25°C
(78°F)		 21°C
(71°F)		 15°C
(58°F)		 6°C
(44°F)		 1°C
(34°F)
Daily mean -6°C
(22°F)		 -4°C
(24°F)		 -1°C
(31°F)		 6°C
(43°F)		 13°C
(55°F)		 18°C
(65°F)		 21°C
(70°F)		 21°C
(70°F)		 17°C
(62°F)		 11°C
(51°F)		 3°C
(37°F)		 -3°C
(27°F)
Average low -10°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 -20°C
(-4°F)		 -20°C
(-4°F)		 -16°C
(3°F)		 -3°C
(26°F)		 3°C
(38°F)		 8°C
(47°F)		 13°C
(55°F)		 12°C
(53°F)		 6°C
(43°F)		 1°C
(34°F)		 -10°C
(14°F)		 -18°C
(1°F)
Minimum -26°C
(-14°F)		 -24°C
(-11°F)		 -19°C
(-2°F)		 -6°C
(22°F)		 1°C
(34°F)		 6°C
(42°F)		 10°C
(50°F)		 10°C
(50°F)		 2°C
(36°F)		 -1°C
(30°F)		 -16°C
(3°F)		 -23°C
(-10°F)

Compare climate in Waterville with other places

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

Monthly average precipitation in Waterville, Maine, United States §

Waterville usually has the most precipitation in April, July and October, with an average of 11 rainy days and 117 mm (4.6 inches) of precipitation per month.The driest months in Waterville 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 Waterville, 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) 82 (3.2) 71 (2.8) 116 (4.6) 81 (3.2) 68 (2.7) 112 (4.4) 74 (2.9) 68 (2.7) 123 (4.8) 107 (4.2) 109 (4.3)
Average precipitation days (≥ 1 mm) 8 9 9 12 10 10 11 9 7 11 12 10

Monthly sunshine hours in Waterville, Maine, United States §

The sunniest months in Waterville are June, July and August, when the sun shines an average of 10 hours 32 minutes a day.Least sunny months in Waterville: January, November 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 Waterville, 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 145 185 255 235 283 320 320 327 284 207 180 173
Mean daily daylight hours 9h 15m 10h 26m 11h 57m 13h 30m 14h 49m 15h 28m 15h 7m 13h 56m 12h 27m 10h 55m 9h 34m 8h 52m

Solar UV radiation in Waterville, Maine, United States §

Waterville 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 Waterville UV Index data.

Average daily maximum UV levels by month for Waterville, 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