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Monthly climate in Porterville, California, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Porterville features a cold semi-arid climate (BSk).Temperatures typically range between 10 °C (51 °F) and 30 °C (87 °F) through the year, but rarely can drop to -2 °C (29 °F) or can rise to as high as 44 °C (111 °F).The average annual precipitation amounts to about 456 mm (17.9 inches) and receives 50 rainy days on the 1 mm (0.04 inches) threshold annually.Porterville enjoys an average of 3616 hours of sunshine throughout the year, and daylight varies from 9 hours 45 minutes to 14 hours 32 minutes per day.

Monthly average temperatures in Porterville, California, United States §

The warmest months in Porterville are June, July and August, with daily mean temperatures ranging from 26 to 30 °C (80 - 87 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 10 to 11 °C (51 - 52 °F) throughout the day. On average each year, Porterville experiences 154 days above 25 °C (77.0 °F) and 1 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Porterville, 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 23°C
(74°F)		 26°C
(79°F)		 28°C
(83°F)		 33°C
(91°F)		 38°C
(101°F)		 42°C
(108°F)		 43°C
(109°F)		 44°C
(111°F)		 42°C
(108°F)		 35°C
(95°F)		 28°C
(83°F)		 24°C
(75°F)
Mean maximum 21°C
(70°F)		 23°C
(75°F)		 27°C
(80°F)		 30°C
(87°F)		 35°C
(95°F)		 38°C
(100°F)		 41°C
(106°F)		 41°C
(106°F)		 40°C
(104°F)		 33°C
(91°F)		 27°C
(81°F)		 21°C
(70°F)
Average high 15°C
(60°F)		 17°C
(63°F)		 19°C
(66°F)		 23°C
(73°F)		 27°C
(81°F)		 33°C
(92°F)		 37°C
(99°F)		 37°C
(99°F)		 33°C
(92°F)		 27°C
(80°F)		 21°C
(69°F)		 15°C
(60°F)
Daily mean 10°C
(51°F)		 11°C
(52°F)		 13°C
(56°F)		 17°C
(63°F)		 21°C
(69°F)		 26°C
(80°F)		 30°C
(87°F)		 30°C
(86°F)		 26°C
(79°F)		 20°C
(68°F)		 14°C
(58°F)		 10°C
(51°F)
Average low 6°C
(43°F)		 6°C
(43°F)		 8°C
(46°F)		 11°C
(52°F)		 14°C
(58°F)		 19°C
(67°F)		 23°C
(74°F)		 22°C
(73°F)		 19°C
(66°F)		 13°C
(55°F)		 9°C
(48°F)		 6°C
(43°F)
Mean minimum 1°C
(35°F)		 0°C
(33°F)		 2°C
(36°F)		 6°C
(43°F)		 9°C
(48°F)		 13°C
(55°F)		 20°C
(68°F)		 19°C
(66°F)		 13°C
(56°F)		 7°C
(46°F)		 4°C
(39°F)		 2°C
(35°F)
Minimum -1°C
(30°F)		 -2°C
(29°F)		 1°C
(33°F)		 4°C
(40°F)		 7°C
(44°F)		 12°C
(54°F)		 18°C
(64°F)		 19°C
(66°F)		 11°C
(52°F)		 6°C
(42°F)		 1°C
(34°F)		 0°C
(33°F)

Compare climate in Porterville with other places

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

Monthly average precipitation in Porterville, California, United States §

Porterville usually has the most precipitation in January, February and March, with an average of 9 rainy days and 87 mm (3.4 inches) of precipitation per month.The driest months in Porterville are June, July and August. On average, 0 mm (0.0 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Porterville, 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) 76 (3.0) 78 (3.1) 108 (4.3) 43 (1.7) 26 (1.0) 1 (0.0) 0 (0.0) 0 (0.0) 2 (0.1) 11 (0.4) 37 (1.5) 75 (2.9)
Average precipitation days (≥ 1 mm) 7 9 12 6 3 0 0 0 0 1 4 8

Monthly sunshine hours in Porterville, California, United States §

The sunniest months in Porterville are May, June and July, when the sun shines an average of 12 hours 23 minutes a day.Least sunny months in Porterville: 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 Porterville, 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 178 236 290 324 370 382 387 361 316 293 248 225
Mean daily daylight hours 10h 1m 10h 53m 11h 59m 13h 7m 14h 4m 14h 32m 14h 17m 13h 26m 12h 21m 11h 13m 10h 14m 9h 45m

Solar UV radiation in Porterville, California, United States §

Porterville 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, November 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 Porterville UV Index data.

Average daily maximum UV levels by month for Porterville, 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 5 8 9 10 11 11 10 9 7 4 3