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Monthly climate in Williams, Oregon, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Williams features a warm-summer Mediterranean climate (Csb).Temperatures typically range between 3 °C (38 °F) and 22 °C (71 °F) through the year, but rarely can drop to -8 °C (17 °F) or can rise to as high as 40 °C (105 °F).The average annual precipitation amounts to about 888 mm (35.0 inches) and receives 100 rainy days on the 1 mm (0.04 inches) threshold annually.Williams enjoys an average of 3095 hours of sunshine throughout the year, and daylight varies from 9 hours 8 minutes to 15 hours 12 minutes per day.

Monthly average temperatures in Williams, Oregon, United States §

The warmest months in Williams are June, July and August, with daily mean temperatures ranging from 18 to 22 °C (64 - 71 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 3 to 4 °C (38 - 40 °F) throughout the day. On average each year, Williams experiences 80 days above 25 °C (77.0 °F) and 64 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Williams, Oregon, 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 17°C
(63°F)		 19°C
(67°F)		 21°C
(70°F)		 27°C
(80°F)		 31°C
(87°F)		 40°C
(104°F)		 37°C
(98°F)		 40°C
(105°F)		 37°C
(99°F)		 29°C
(85°F)		 23°C
(75°F)		 17°C
(62°F)
Mean maximum 15°C
(58°F)		 17°C
(62°F)		 20°C
(68°F)		 25°C
(77°F)		 28°C
(83°F)		 33°C
(92°F)		 35°C
(95°F)		 37°C
(98°F)		 33°C
(92°F)		 26°C
(78°F)		 20°C
(69°F)		 14°C
(57°F)
Average high 9°C
(48°F)		 9°C
(49°F)		 12°C
(54°F)		 16°C
(61°F)		 20°C
(68°F)		 25°C
(77°F)		 30°C
(86°F)		 30°C
(86°F)		 25°C
(77°F)		 19°C
(66°F)		 12°C
(55°F)		 8°C
(46°F)
Daily mean 4°C
(40°F)		 4°C
(40°F)		 6°C
(44°F)		 9°C
(49°F)		 13°C
(56°F)		 18°C
(64°F)		 22°C
(71°F)		 21°C
(71°F)		 17°C
(63°F)		 11°C
(53°F)		 7°C
(44°F)		 3°C
(38°F)
Average low 1°C
(33°F)		 0°C
(32°F)		 2°C
(35°F)		 4°C
(39°F)		 7°C
(45°F)		 11°C
(52°F)		 14°C
(57°F)		 14°C
(57°F)		 10°C
(50°F)		 5°C
(42°F)		 2°C
(36°F)		 -0°C
(32°F)
Mean minimum -5°C
(24°F)		 -5°C
(24°F)		 -4°C
(25°F)		 -1°C
(30°F)		 1°C
(35°F)		 4°C
(40°F)		 9°C
(48°F)		 8°C
(47°F)		 4°C
(39°F)		 -1°C
(31°F)		 -4°C
(25°F)		 -5°C
(23°F)
Minimum -8°C
(17°F)		 -6°C
(22°F)		 -5°C
(24°F)		 -2°C
(28°F)		 0°C
(33°F)		 3°C
(37°F)		 7°C
(45°F)		 7°C
(45°F)		 1°C
(34°F)		 -3°C
(27°F)		 -8°C
(18°F)		 -7°C
(20°F)

Compare climate in Williams with other places

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

Monthly average precipitation in Williams, Oregon, United States §

Williams usually has the most precipitation in January, February and December, with an average of 13 rainy days and 142 mm (5.6 inches) of precipitation per month.The driest months in Williams are June, July and August. On average, 10 mm (0.4 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Williams, Oregon, 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) 150 (5.9) 155 (6.1) 112 (4.4) 91 (3.6) 57 (2.3) 21 (0.8) 3 (0.1) 6 (0.3) 33 (1.3) 42 (1.6) 96 (3.8) 121 (4.8)
Average precipitation days (≥ 1 mm) 13 14 15 11 8 4 1 1 5 6 10 12

Monthly sunshine hours in Williams, Oregon, United States §

The sunniest months in Williams are June, July and August, when the sun shines an average of 12 hours 24 minutes a day.Least sunny months in Williams: January, February and December receive an average of 4 hours 25 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Williams, Oregon, 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 103 159 220 262 335 371 403 366 301 256 173 139
Mean daily daylight hours 9h 29m 10h 35m 11h 58m 13h 23m 14h 36m 15h 12m 14h 52m 13h 47m 12h 25m 11h 0m 9h 45m 9h 8m

Solar UV radiation in Williams, Oregon, United States §

Williams experiences the highest level of ultraviolet (UV) radiation in May, June and August, when the maximum UV index can reach values of 10 - 11, which corresponds to the Very High / Extreme 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 Williams UV Index data.

Average daily maximum UV levels by month for Williams, Oregon, 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 11 10 10 8 6 4 2