nomadseason

Monthly climate in Thornton, California, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Thornton features a hot-summer Mediterranean climate (Csa).Temperatures typically range between 10 °C (50 °F) and 24 °C (75 °F) through the year, but rarely can drop to -2 °C (28 °F) or can rise to as high as 43 °C (109 °F).The average annual precipitation amounts to about 535 mm (21.1 inches) and receives 49 rainy days on the 1 mm (0.04 inches) threshold annually.Thornton enjoys an average of 3443 hours of sunshine throughout the year, and daylight varies from 9 hours 32 minutes to 14 hours 46 minutes per day.

Monthly average temperatures in Thornton, California, United States §

The warmest months in Thornton are June, July and August, with daily mean temperatures ranging from 23 to 24 °C (74 - 75 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 10 to 12 °C (50 - 53 °F) throughout the day. On average each year, Thornton experiences 156 days above 25 °C (77.0 °F) and 2 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Thornton, 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 25°C
(77°F)		 26°C
(79°F)		 29°C
(85°F)		 35°C
(95°F)		 40°C
(104°F)		 42°C
(109°F)		 41°C
(106°F)		 43°C
(109°F)		 42°C
(108°F)		 38°C
(101°F)		 29°C
(85°F)		 24°C
(76°F)
Mean maximum 20°C
(68°F)		 23°C
(73°F)		 28°C
(82°F)		 32°C
(90°F)		 36°C
(97°F)		 40°C
(104°F)		 39°C
(103°F)		 39°C
(103°F)		 39°C
(102°F)		 33°C
(92°F)		 25°C
(77°F)		 20°C
(68°F)
Average high 15°C
(59°F)		 18°C
(64°F)		 20°C
(68°F)		 24°C
(75°F)		 28°C
(83°F)		 32°C
(90°F)		 33°C
(92°F)		 33°C
(91°F)		 31°C
(88°F)		 27°C
(80°F)		 19°C
(67°F)		 15°C
(59°F)
Daily mean 10°C
(50°F)		 12°C
(53°F)		 14°C
(57°F)		 17°C
(63°F)		 20°C
(68°F)		 23°C
(74°F)		 24°C
(75°F)		 24°C
(75°F)		 23°C
(73°F)		 19°C
(66°F)		 13°C
(56°F)		 10°C
(50°F)
Average low 6°C
(43°F)		 6°C
(44°F)		 8°C
(47°F)		 11°C
(52°F)		 13°C
(56°F)		 16°C
(61°F)		 16°C
(61°F)		 17°C
(62°F)		 15°C
(60°F)		 12°C
(54°F)		 8°C
(46°F)		 5°C
(42°F)
Mean minimum 0°C
(33°F)		 1°C
(33°F)		 3°C
(38°F)		 6°C
(43°F)		 9°C
(49°F)		 12°C
(55°F)		 13°C
(57°F)		 13°C
(56°F)		 11°C
(52°F)		 7°C
(44°F)		 2°C
(36°F)		 0°C
(33°F)
Minimum -1°C
(30°F)		 -2°C
(28°F)		 2°C
(36°F)		 4°C
(40°F)		 6°C
(43°F)		 11°C
(52°F)		 13°C
(55°F)		 12°C
(54°F)		 9°C
(48°F)		 5°C
(42°F)		 -0°C
(32°F)		 -1°C
(30°F)

Compare climate in Thornton with other places

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

Monthly average precipitation in Thornton, California, United States §

Thornton usually has the most precipitation in January, February and December, with an average of 8 rainy days and 104 mm (4.1 inches) of precipitation per month.The driest months in Thornton are July, August and September. On average, 0 mm (0.0 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Thornton, 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) 116 (4.6) 100 (3.9) 83 (3.3) 39 (1.5) 17 (0.7) 2 (0.1) 0 (0.0) 0 (0.0) 1 (0.0) 36 (1.4) 46 (1.8) 95 (3.7)
Average precipitation days (≥ 1 mm) 8 8 10 5 2 0 0 0 0 2 5 9

Monthly sunshine hours in Thornton, California, United States §

The sunniest months in Thornton are May, June and July, when the sun shines an average of 12 hours 25 minutes a day.Least sunny months in Thornton: January, February and December receive an average of 6 hours 8 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Thornton, 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 149 214 261 299 364 383 394 357 314 284 223 195
Mean daily daylight hours 9h 50m 10h 46m 11h 59m 13h 13m 14h 15m 14h 46m 14h 29m 13h 33m 12h 22m 11h 8m 10h 4m 9h 32m

Solar UV radiation in Thornton, California, United States §

Thornton experiences the highest level of ultraviolet (UV) radiation in June, July 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 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 Thornton UV Index data.

Average daily maximum UV levels by month for Thornton, 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) 3 4 7 8 10 11 11 10 9 6 4 3