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Monthly climate in Johnstonville, California, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Johnstonville features a warm-summer Mediterranean climate (Csb).Temperatures typically range between -1 °C (31 °F) and 24 °C (75 °F) through the year, but rarely can drop to -18 °C (1 °F) or can rise to as high as 38 °C (101 °F).The average annual precipitation amounts to about 508 mm (20.0 inches) and receives 71 rainy days on the 1 mm (0.04 inches) threshold annually.Johnstonville enjoys an average of 3440 hours of sunshine throughout the year, and daylight varies from 9 hours 19 minutes to 14 hours 59 minutes per day.

Monthly average temperatures in Johnstonville, California, United States §

The warmest months in Johnstonville are June, July and August, with daily mean temperatures ranging from 19 to 24 °C (67 - 75 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -1 to 0 °C (31 - 33 °F) throughout the day. On average each year, Johnstonville experiences 90 days above 25 °C (77.0 °F) and 122 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Johnstonville, 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 12°C
(54°F)		 17°C
(64°F)		 21°C
(70°F)		 27°C
(80°F)		 32°C
(90°F)		 37°C
(98°F)		 38°C
(101°F)		 37°C
(98°F)		 36°C
(97°F)		 29°C
(85°F)		 22°C
(72°F)		 13°C
(55°F)
Mean maximum 10°C
(50°F)		 13°C
(55°F)		 18°C
(64°F)		 24°C
(75°F)		 29°C
(84°F)		 32°C
(89°F)		 36°C
(97°F)		 36°C
(96°F)		 34°C
(93°F)		 25°C
(78°F)		 20°C
(68°F)		 10°C
(51°F)
Average high 4°C
(40°F)		 6°C
(44°F)		 9°C
(48°F)		 15°C
(59°F)		 20°C
(68°F)		 26°C
(80°F)		 32°C
(90°F)		 31°C
(88°F)		 26°C
(78°F)		 18°C
(64°F)		 10°C
(51°F)		 4°C
(39°F)
Daily mean -0°C
(32°F)		 0°C
(33°F)		 3°C
(38°F)		 8°C
(47°F)		 13°C
(56°F)		 19°C
(67°F)		 24°C
(75°F)		 23°C
(73°F)		 18°C
(64°F)		 10°C
(51°F)		 5°C
(41°F)		 -1°C
(31°F)
Average low -4°C
(25°F)		 -4°C
(24°F)		 -2°C
(28°F)		 2°C
(35°F)		 6°C
(43°F)		 11°C
(52°F)		 15°C
(59°F)		 15°C
(59°F)		 10°C
(51°F)		 4°C
(39°F)		 -0°C
(32°F)		 -5°C
(24°F)
Mean minimum -12°C
(10°F)		 -13°C
(9°F)		 -10°C
(13°F)		 -5°C
(24°F)		 -0°C
(31°F)		 3°C
(37°F)		 12°C
(53°F)		 10°C
(51°F)		 3°C
(38°F)		 -4°C
(26°F)		 -6°C
(21°F)		 -11°C
(12°F)
Minimum -18°C
(1°F)		 -15°C
(6°F)		 -16°C
(4°F)		 -8°C
(17°F)		 -4°C
(25°F)		 0°C
(33°F)		 10°C
(50°F)		 8°C
(47°F)		 -1°C
(31°F)		 -7°C
(20°F)		 -9°C
(17°F)		 -13°C
(9°F)

Compare climate in Johnstonville with other places

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

Monthly average precipitation in Johnstonville, California, United States §

Johnstonville usually has the most precipitation in January, February and March, with an average of 10 rainy days and 85 mm (3.4 inches) of precipitation per month.The driest months in Johnstonville are June, July and August. On average, 8 mm (0.3 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Johnstonville, 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) 88 (3.5) 93 (3.7) 75 (3.0) 38 (1.5) 40 (1.6) 10 (0.4) 7 (0.3) 7 (0.3) 16 (0.6) 32 (1.2) 39 (1.5) 63 (2.5)
Average precipitation days (≥ 1 mm) 10 10 11 7 7 2 2 2 3 2 6 9

Monthly sunshine hours in Johnstonville, California, United States §

The sunniest months in Johnstonville are June, July and August, when the sun shines an average of 12 hours 30 minutes a day.Least sunny months in Johnstonville: January, February and December receive an average of 5 hours 59 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Johnstonville, 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 144 210 261 305 355 389 398 362 320 282 219 190
Mean daily daylight hours 9h 39m 10h 40m 11h 58m 13h 18m 14h 26m 14h 59m 14h 41m 13h 40m 12h 24m 11h 4m 9h 54m 9h 19m

Solar UV radiation in Johnstonville, California, United States §

Johnstonville experiences the highest level of ultraviolet (UV) radiation in May, June and August, when the maximum UV index can reach values of 11 - 12, which corresponds to the 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 Johnstonville UV Index data.

Average daily maximum UV levels by month for Johnstonville, 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 11 12 11 11 9 7 4 3