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Monthly climate in Hartley, California, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Hartley features a hot-summer Mediterranean climate (Csa).Temperatures typically range between 10 °C (50 °F) and 25 °C (77 °F) through the year, but rarely can drop to -3 °C (27 °F) or can rise to as high as 45 °C (113 °F).The average annual precipitation amounts to about 510 mm (20.1 inches) and receives 45 rainy days on the 1 mm (0.04 inches) threshold annually.Hartley enjoys an average of 3437 hours of sunshine throughout the year, and daylight varies from 9 hours 30 minutes to 14 hours 47 minutes per day.

Monthly average temperatures in Hartley, California, United States §

The warmest months in Hartley are June, July and August, with daily mean temperatures ranging from 24 to 25 °C (75 - 77 °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 - 54 °F) throughout the day. On average each year, Hartley experiences 163 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 Hartley, 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 26°C
(79°F)		 27°C
(82°F)		 32°C
(89°F)		 34°C
(94°F)		 40°C
(103°F)		 43°C
(110°F)		 42°C
(108°F)		 44°C
(111°F)		 45°C
(113°F)		 40°C
(104°F)		 30°C
(87°F)		 23°C
(75°F)
Mean maximum 21°C
(69°F)		 24°C
(76°F)		 28°C
(83°F)		 33°C
(91°F)		 36°C
(98°F)		 40°C
(104°F)		 40°C
(105°F)		 41°C
(106°F)		 41°C
(106°F)		 34°C
(94°F)		 26°C
(80°F)		 21°C
(70°F)
Average high 15°C
(59°F)		 18°C
(65°F)		 19°C
(67°F)		 24°C
(75°F)		 28°C
(82°F)		 33°C
(91°F)		 34°C
(94°F)		 34°C
(93°F)		 32°C
(90°F)		 27°C
(81°F)		 20°C
(68°F)		 15°C
(59°F)
Daily mean 10°C
(50°F)		 12°C
(54°F)		 13°C
(56°F)		 17°C
(62°F)		 20°C
(68°F)		 24°C
(75°F)		 25°C
(77°F)		 24°C
(76°F)		 23°C
(74°F)		 19°C
(66°F)		 13°C
(56°F)		 10°C
(50°F)
Average low 6°C
(43°F)		 7°C
(44°F)		 7°C
(46°F)		 10°C
(50°F)		 13°C
(55°F)		 16°C
(61°F)		 16°C
(61°F)		 16°C
(62°F)		 15°C
(59°F)		 12°C
(53°F)		 8°C
(46°F)		 6°C
(42°F)
Mean minimum -1°C
(31°F)		 0°C
(32°F)		 2°C
(35°F)		 4°C
(39°F)		 8°C
(46°F)		 12°C
(54°F)		 13°C
(56°F)		 13°C
(56°F)		 9°C
(49°F)		 5°C
(41°F)		 1°C
(35°F)		 1°C
(34°F)
Minimum -2°C
(29°F)		 -3°C
(27°F)		 1°C
(34°F)		 3°C
(37°F)		 4°C
(40°F)		 9°C
(49°F)		 12°C
(54°F)		 11°C
(52°F)		 6°C
(43°F)		 3°C
(37°F)		 -2°C
(29°F)		 -0°C
(32°F)

Compare climate in Hartley with other places

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

Monthly average precipitation in Hartley, California, United States §

Hartley usually has the most precipitation in January, February and December, with an average of 7 rainy days and 105 mm (4.1 inches) of precipitation per month.The driest months in Hartley are July, August and September. On average, 1 mm (0.0 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Hartley, 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) 124 (4.9) 106 (4.2) 79 (3.1) 30 (1.2) 18 (0.7) 2 (0.1) 0 (0.0) 0 (0.0) 1 (0.0) 27 (1.1) 38 (1.5) 85 (3.3)
Average precipitation days (≥ 1 mm) 8 7 9 5 2 0 0 0 0 1 5 8

Monthly sunshine hours in Hartley, California, United States §

The sunniest months in Hartley are May, June and July, when the sun shines an average of 12 hours 26 minutes a day.Least sunny months in Hartley: January, February and December receive an average of 6 hours 4 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Hartley, 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 146 214 260 298 364 384 396 357 315 283 222 192
Mean daily daylight hours 9h 48m 10h 46m 11h 59m 13h 14m 14h 16m 14h 47m 14h 30m 13h 34m 12h 22m 11h 8m 10h 3m 9h 30m

Solar UV radiation in Hartley, California, United States §

Hartley 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 Hartley UV Index data.

Average daily maximum UV levels by month for Hartley, 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 5 7 9 10 11 11 10 9 6 4 3