nomadseason

Monthly climate in Williamson, Arizona, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Williamson features a cold semi-arid climate (BSk).Temperatures typically range between 4 °C (40 °F) and 26 °C (80 °F) through the year, but rarely can drop to -15 °C (5 °F) or can rise to as high as 40 °C (104 °F).The average annual precipitation amounts to about 347 mm (13.7 inches) and receives 56 rainy days on the 1 mm (0.04 inches) threshold annually.Williamson enjoys an average of 3601 hours of sunshine throughout the year, and daylight varies from 9 hours 51 minutes to 14 hours 26 minutes per day.

Monthly average temperatures in Williamson, Arizona, United States §

The warmest months in Williamson are June, July and August, with daily mean temperatures ranging from 25 to 26 °C (77 - 80 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 4 to 5 °C (40 - 42 °F) throughout the day. On average each year, Williamson experiences 135 days above 25 °C (77.0 °F) and 66 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, Arizona, 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 19°C
(66°F)		 21°C
(70°F)		 26°C
(80°F)		 31°C
(89°F)		 35°C
(95°F)		 40°C
(104°F)		 39°C
(103°F)		 40°C
(104°F)		 38°C
(101°F)		 32°C
(91°F)		 26°C
(80°F)		 20°C
(69°F)
Mean maximum 17°C
(64°F)		 19°C
(67°F)		 24°C
(75°F)		 28°C
(83°F)		 31°C
(89°F)		 36°C
(96°F)		 38°C
(100°F)		 37°C
(99°F)		 36°C
(96°F)		 29°C
(84°F)		 24°C
(75°F)		 18°C
(66°F)
Average high 12°C
(53°F)		 13°C
(55°F)		 16°C
(61°F)		 22°C
(72°F)		 25°C
(78°F)		 32°C
(90°F)		 33°C
(91°F)		 32°C
(91°F)		 30°C
(86°F)		 23°C
(74°F)		 18°C
(65°F)		 12°C
(54°F)
Daily mean 4°C
(40°F)		 5°C
(42°F)		 9°C
(48°F)		 14°C
(58°F)		 18°C
(66°F)		 25°C
(77°F)		 26°C
(80°F)		 26°C
(78°F)		 23°C
(73°F)		 15°C
(60°F)		 10°C
(50°F)		 5°C
(41°F)
Average low -1°C
(30°F)		 -1°C
(31°F)		 2°C
(36°F)		 6°C
(44°F)		 10°C
(51°F)		 16°C
(61°F)		 20°C
(67°F)		 19°C
(66°F)		 15°C
(60°F)		 8°C
(47°F)		 3°C
(38°F)		 -1°C
(31°F)
Mean minimum -8°C
(18°F)		 -9°C
(16°F)		 -4°C
(26°F)		 0°C
(33°F)		 4°C
(39°F)		 11°C
(51°F)		 16°C
(61°F)		 15°C
(59°F)		 9°C
(49°F)		 1°C
(33°F)		 -4°C
(25°F)		 -6°C
(21°F)
Minimum -15°C
(6°F)		 -15°C
(5°F)		 -6°C
(22°F)		 -2°C
(29°F)		 3°C
(37°F)		 8°C
(47°F)		 14°C
(57°F)		 14°C
(57°F)		 4°C
(40°F)		 -3°C
(26°F)		 -5°C
(22°F)		 -9°C
(16°F)

Compare climate in Williamson with other places

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

Monthly average precipitation in Williamson, Arizona, United States §

Williamson usually has the most precipitation in March, July and August, with an average of 9 rainy days and 51 mm (2.0 inches) of precipitation per month.The driest months in Williamson are April, May and June. On average, 9 mm (0.4 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Williamson, Arizona, 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) 36 (1.4) 38 (1.5) 46 (1.8) 9 (0.4) 14 (0.6) 4 (0.2) 68 (2.7) 39 (1.5) 23 (0.9) 25 (1.0) 21 (0.8) 24 (1.0)
Average precipitation days (≥ 1 mm) 5 6 7 2 3 0 11 9 4 3 2 4

Monthly sunshine hours in Williamson, Arizona, United States §

The sunniest months in Williamson are May, June and July, when the sun shines an average of 12 hours 5 minutes a day.Least sunny months in Williamson: January, February and December receive an average of 7 hours 8 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Williamson, Arizona, 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 181 240 297 329 371 375 364 347 315 295 254 227
Mean daily daylight hours 10h 6m 10h 56m 11h 59m 13h 4m 13h 59m 14h 26m 14h 11m 13h 23m 12h 20m 11h 15m 10h 19m 9h 51m

Solar UV radiation in Williamson, Arizona, United States §

Williamson experiences the highest level of ultraviolet (UV) radiation in May, June and July, when the maximum UV index can reach values of 12 - 12, which corresponds to the Extreme category of sun exposure.January, November and December are in the Moderate / High exposure category. In these months, the maximum values of the UV index do not exceed 6. For more detailed information, check out our hourly Williamson UV Index data.

Average daily maximum UV levels by month for Williamson, Arizona, 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) 4 7 9 11 12 12 12 11 10 8 6 4