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Monthly climate in Williamson, New York, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Williamson features a humid continental climate (Dfb).Temperatures typically range between -2 °C (29 °F) and 22 °C (72 °F) through the year, but rarely can drop to -17 °C (2 °F) or can rise to as high as 31 °C (88 °F).The average annual precipitation amounts to about 1308 mm (51.5 inches) and receives 167 rainy days on the 1 mm (0.04 inches) threshold annually.Williamson enjoys an average of 2770 hours of sunshine throughout the year, and daylight varies from 9 hours 1 minutes to 15 hours 18 minutes per day.

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

The warmest months in Williamson are July, August and September, 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 -2 to 1 °C (29 - 34 °F) throughout the day. On average each year, Williamson experiences 39 days above 25 °C (77.0 °F) and 89 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Williamson, 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 15°C
(59°F)		 17°C
(63°F)		 19°C
(67°F)		 23°C
(73°F)		 25°C
(78°F)		 29°C
(85°F)		 31°C
(88°F)		 31°C
(88°F)		 30°C
(87°F)		 27°C
(81°F)		 22°C
(71°F)		 17°C
(63°F)
Mean maximum 11°C
(52°F)		 13°C
(55°F)		 16°C
(62°F)		 19°C
(67°F)		 24°C
(76°F)		 27°C
(81°F)		 30°C
(86°F)		 30°C
(85°F)		 28°C
(83°F)		 25°C
(78°F)		 18°C
(65°F)		 13°C
(55°F)
Average high 1°C
(34°F)		 2°C
(36°F)		 5°C
(41°F)		 10°C
(50°F)		 15°C
(60°F)		 21°C
(70°F)		 25°C
(78°F)		 25°C
(78°F)		 22°C
(72°F)		 16°C
(61°F)		 8°C
(47°F)		 3°C
(38°F)
Daily mean -2°C
(29°F)		 -1°C
(30°F)		 2°C
(35°F)		 6°C
(44°F)		 12°C
(54°F)		 18°C
(64°F)		 22°C
(72°F)		 22°C
(72°F)		 19°C
(66°F)		 13°C
(56°F)		 5°C
(42°F)		 1°C
(34°F)
Average low -5°C
(24°F)		 -4°C
(25°F)		 -1°C
(30°F)		 3°C
(39°F)		 9°C
(48°F)		 14°C
(58°F)		 19°C
(67°F)		 19°C
(67°F)		 15°C
(60°F)		 10°C
(51°F)		 2°C
(36°F)		 -1°C
(30°F)
Mean minimum -14°C
(8°F)		 -12°C
(10°F)		 -11°C
(13°F)		 -1°C
(30°F)		 3°C
(37°F)		 10°C
(50°F)		 15°C
(60°F)		 15°C
(59°F)		 10°C
(50°F)		 4°C
(39°F)		 -6°C
(21°F)		 -9°C
(15°F)
Minimum -17°C
(2°F)		 -16°C
(3°F)		 -12°C
(10°F)		 -3°C
(27°F)		 -0°C
(32°F)		 6°C
(44°F)		 12°C
(55°F)		 13°C
(56°F)		 7°C
(44°F)		 2°C
(36°F)		 -12°C
(11°F)		 -14°C
(7°F)

Compare climate in Williamson with other places

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

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

Williamson usually has the most precipitation in April, July and October, with an average of 14 rainy days and 146 mm (5.7 inches) of precipitation per month.The driest months in Williamson are March, June and September. On average, 83 mm (3.2 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Williamson, 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) 94 (3.7) 94 (3.7) 85 (3.3) 124 (4.9) 110 (4.3) 80 (3.1) 149 (5.9) 103 (4.1) 83 (3.3) 164 (6.5) 110 (4.3) 113 (4.4)
Average precipitation days (≥ 1 mm) 15 16 13 15 13 11 13 13 8 14 16 20

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

The sunniest months in Williamson are June, July and August, when the sun shines an average of 11 hours 3 minutes a day.Least sunny months in Williamson: January, February and December receive an average of 3 hours 53 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Williamson, 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 97 139 227 237 283 335 343 339 290 206 153 116
Mean daily daylight hours 9h 23m 10h 31m 11h 57m 13h 26m 14h 41m 15h 18m 14h 58m 13h 51m 12h 26m 10h 58m 9h 41m 9h 1m

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

Williamson experiences the highest level of ultraviolet (UV) radiation in May, June and August, 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 Williamson UV Index data.

Average daily maximum UV levels by month for Williamson, 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) 2 4 6 8 10 10 9 9 7 5 3 2