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Monthly climate in Groton, New York, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Groton features a humid continental climate (Dfb).Temperatures typically range between -4 °C (25 °F) and 21 °C (71 °F) through the year, but rarely can drop to -27 °C (-17 °F) or can rise to as high as 34 °C (93 °F).The average annual precipitation amounts to about 1377 mm (54.2 inches) and receives 173 rainy days on the 1 mm (0.04 inches) threshold annually.Groton enjoys an average of 2702 hours of sunshine throughout the year, and daylight varies from 9 hours 5 minutes to 15 hours 14 minutes per day.

Monthly average temperatures in Groton, New York, United States §

The warmest months in Groton are June, July and August, with daily mean temperatures ranging from 19 to 21 °C (66 - 71 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -4 to -1 °C (25 - 30 °F) throughout the day. On average each year, Groton experiences 54 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 Groton, New York, 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 18°C
(64°F)		 20°C
(69°F)		 22°C
(72°F)		 26°C
(79°F)		 31°C
(88°F)		 33°C
(92°F)		 34°C
(93°F)		 33°C
(91°F)		 32°C
(90°F)		 27°C
(81°F)		 23°C
(73°F)		 16°C
(62°F)
Mean maximum 11°C
(52°F)		 14°C
(58°F)		 18°C
(65°F)		 23°C
(73°F)		 30°C
(86°F)		 31°C
(88°F)		 31°C
(88°F)		 31°C
(88°F)		 29°C
(84°F)		 26°C
(79°F)		 19°C
(66°F)		 13°C
(55°F)
Average high -1°C
(31°F)		 1°C
(35°F)		 5°C
(42°F)		 12°C
(54°F)		 19°C
(67°F)		 24°C
(75°F)		 26°C
(79°F)		 25°C
(78°F)		 22°C
(72°F)		 16°C
(60°F)		 7°C
(44°F)		 2°C
(36°F)
Daily mean -4°C
(25°F)		 -3°C
(27°F)		 1°C
(34°F)		 7°C
(45°F)		 14°C
(57°F)		 19°C
(66°F)		 21°C
(71°F)		 20°C
(69°F)		 17°C
(62°F)		 11°C
(52°F)		 3°C
(37°F)		 -1°C
(30°F)
Average low -8°C
(17°F)		 -7°C
(19°F)		 -4°C
(25°F)		 3°C
(37°F)		 9°C
(48°F)		 13°C
(56°F)		 17°C
(63°F)		 16°C
(61°F)		 12°C
(54°F)		 7°C
(45°F)		 -1°C
(30°F)		 -5°C
(24°F)
Mean minimum -21°C
(-5°F)		 -20°C
(-3°F)		 -16°C
(4°F)		 -4°C
(25°F)		 1°C
(34°F)		 8°C
(46°F)		 11°C
(52°F)		 9°C
(49°F)		 4°C
(39°F)		 -1°C
(31°F)		 -12°C
(11°F)		 -16°C
(4°F)
Minimum -27°C
(-17°F)		 -24°C
(-11°F)		 -19°C
(-2°F)		 -6°C
(21°F)		 -3°C
(27°F)		 3°C
(38°F)		 9°C
(49°F)		 6°C
(43°F)		 -1°C
(31°F)		 -2°C
(29°F)		 -26°C
(-14°F)		 -19°C
(-3°F)

Compare climate in Groton with other places

Compare temperature, precipitation, sunshine, UV index in Groton, New York, United States with other places around the world.

Monthly average precipitation in Groton, New York, United States §

Groton usually has the most precipitation in May, July and October, with an average of 16 rainy days and 151 mm (6.0 inches) of precipitation per month.The driest months in Groton are January, February and March. On average, 92 mm (3.6 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Groton, New York, 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) 88 (3.5) 96 (3.8) 91 (3.6) 124 (4.9) 137 (5.4) 105 (4.1) 163 (6.4) 116 (4.6) 99 (3.9) 155 (6.1) 102 (4.0) 102 (4.0)
Average precipitation days (≥ 1 mm) 14 15 13 16 17 13 17 13 10 15 14 16

Monthly sunshine hours in Groton, New York, United States §

The sunniest months in Groton are June, July and August, when the sun shines an average of 10 hours 49 minutes a day.Least sunny months in Groton: January, February and December receive an average of 3 hours 55 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Groton, New York, 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 103 143 215 228 265 324 341 329 283 204 152 109
Mean daily daylight hours 9h 26m 10h 33m 11h 57m 13h 24m 14h 38m 15h 14m 14h 54m 13h 49m 12h 25m 10h 59m 9h 44m 9h 5m

Solar UV radiation in Groton, New York, United States §

Groton experiences the highest level of ultraviolet (UV) radiation in May, June and July, when the maximum UV index can reach values of 10 - 10, which corresponds to the Very High category of sun exposure.January, February and December are in the Low / Moderate exposure category. In these months, the maximum values of the UV index do not exceed 4. For more detailed information, check out our hourly Groton UV Index data.

Average daily maximum UV levels by month for Groton, New York, 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) 3 4 6 8 10 10 10 9 8 6 4 2