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Monthly climate in Willowbrook, California, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Willowbrook features a cold semi-arid climate (BSk).Temperatures typically range between 13 °C (57 °F) and 24 °C (76 °F) through the year, but rarely can drop to 2 °C (36 °F) or can rise to as high as 45 °C (113 °F).The average annual precipitation amounts to about 338 mm (13.3 inches) and receives 30 rainy days on the 1 mm (0.04 inches) threshold annually.Willowbrook enjoys an average of 3548 hours of sunshine throughout the year, and daylight varies from 9 hours 55 minutes to 14 hours 21 minutes per day.

Monthly average temperatures in Willowbrook, California, United States §

The warmest months in Willowbrook are July, August and September, with daily mean temperatures ranging from 23 to 24 °C (74 - 76 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 13 to 14 °C (57 - 57 °F) throughout the day. On average each year, Willowbrook experiences 152 days above 25 °C (77.0 °F) and 0 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Willowbrook, California, 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 31°C
(89°F)		 32°C
(89°F)		 31°C
(88°F)		 37°C
(99°F)		 35°C
(96°F)		 38°C
(100°F)		 45°C
(113°F)		 39°C
(102°F)		 45°C
(113°F)		 40°C
(105°F)		 34°C
(94°F)		 28°C
(83°F)
Mean maximum 27°C
(80°F)		 26°C
(80°F)		 29°C
(84°F)		 34°C
(93°F)		 32°C
(90°F)		 34°C
(93°F)		 38°C
(100°F)		 36°C
(98°F)		 38°C
(101°F)		 37°C
(98°F)		 33°C
(92°F)		 26°C
(79°F)
Average high 20°C
(67°F)		 20°C
(68°F)		 21°C
(70°F)		 24°C
(75°F)		 24°C
(75°F)		 27°C
(81°F)		 30°C
(87°F)		 31°C
(88°F)		 30°C
(86°F)		 28°C
(83°F)		 24°C
(76°F)		 20°C
(68°F)
Daily mean 13°C
(57°F)		 14°C
(57°F)		 15°C
(59°F)		 18°C
(64°F)		 19°C
(66°F)		 21°C
(70°F)		 24°C
(75°F)		 24°C
(76°F)		 23°C
(74°F)		 21°C
(70°F)		 17°C
(63°F)		 13°C
(57°F)
Average low 9°C
(48°F)		 9°C
(48°F)		 10°C
(51°F)		 13°C
(55°F)		 14°C
(58°F)		 16°C
(62°F)		 19°C
(66°F)		 19°C
(67°F)		 18°C
(65°F)		 15°C
(60°F)		 12°C
(54°F)		 9°C
(48°F)
Mean minimum 4°C
(39°F)		 3°C
(38°F)		 6°C
(42°F)		 9°C
(49°F)		 11°C
(52°F)		 14°C
(57°F)		 16°C
(62°F)		 17°C
(62°F)		 14°C
(58°F)		 10°C
(51°F)		 7°C
(46°F)		 4°C
(39°F)
Minimum 3°C
(37°F)		 2°C
(36°F)		 4°C
(40°F)		 9°C
(48°F)		 9°C
(48°F)		 13°C
(55°F)		 15°C
(60°F)		 15°C
(60°F)		 13°C
(55°F)		 9°C
(49°F)		 5°C
(42°F)		 3°C
(38°F)

Compare climate in Willowbrook with other places

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

Monthly average precipitation in Willowbrook, California, United States §

Willowbrook usually has the most precipitation in January, March and December, with an average of 6 rainy days and 72 mm (2.8 inches) of precipitation per month.The driest months in Willowbrook are July, August and September. On average, 2 mm (0.1 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Willowbrook, California, 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) 71 (2.8) 55 (2.2) 70 (2.8) 19 (0.7) 12 (0.5) 3 (0.1) 2 (0.1) 2 (0.1) 3 (0.1) 8 (0.3) 17 (0.7) 76 (3.0)
Average precipitation days (≥ 1 mm) 5 5 8 2 3 0 0 0 0 1 1 5

Monthly sunshine hours in Willowbrook, California, United States §

The sunniest months in Willowbrook are June, July and August, when the sun shines an average of 12 hours 0 minutes a day.Least sunny months in Willowbrook: January, February and December receive an average of 7 hours 2 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Willowbrook, California, 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 187 228 280 314 347 364 380 360 313 291 255 224
Mean daily daylight hours 10h 10m 10h 58m 11h 59m 13h 2m 13h 56m 14h 21m 14h 7m 13h 20m 12h 19m 11h 17m 10h 22m 9h 55m

Solar UV radiation in Willowbrook, California, United States §

Willowbrook experiences the highest level of ultraviolet (UV) radiation in June, July and September, when the maximum UV index can reach values of 10 - 11, which corresponds to the Very High / Extreme category of sun exposure.January, November and December are in the Moderate exposure category. In these months, the maximum values of the UV index do not exceed 5. For more detailed information, check out our hourly Willowbrook UV Index data.

Average daily maximum UV levels by month for Willowbrook, California, 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 6 8 9 10 11 11 10 10 7 5 4