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Monthly climate in Riverdale, California, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Riverdale features a cold semi-arid climate (BSk).Temperatures typically range between 10 °C (50 °F) and 32 °C (89 °F) through the year, but rarely can drop to -2 °C (29 °F) or can rise to as high as 46 °C (114 °F).The average annual precipitation amounts to about 335 mm (13.2 inches) and receives 37 rainy days on the 1 mm (0.04 inches) threshold annually.Riverdale enjoys an average of 3585 hours of sunshine throughout the year, and daylight varies from 9 hours 42 minutes to 14 hours 35 minutes per day.

Monthly average temperatures in Riverdale, California, United States §

The warmest months in Riverdale are June, July and August, with daily mean temperatures ranging from 28 to 32 °C (83 - 89 °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, Riverdale experiences 177 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 Riverdale, 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
(73°F)		 29°C
(84°F)		 33°C
(91°F)		 36°C
(98°F)		 42°C
(108°F)		 44°C
(112°F)		 45°C
(113°F)		 46°C
(114°F)		 43°C
(109°F)		 35°C
(96°F)		 28°C
(82°F)		 25°C
(77°F)
Mean maximum 21°C
(70°F)		 25°C
(77°F)		 29°C
(85°F)		 34°C
(93°F)		 38°C
(101°F)		 41°C
(105°F)		 43°C
(109°F)		 43°C
(109°F)		 41°C
(106°F)		 33°C
(92°F)		 27°C
(80°F)		 21°C
(70°F)
Average high 16°C
(61°F)		 19°C
(66°F)		 21°C
(70°F)		 26°C
(79°F)		 30°C
(87°F)		 36°C
(96°F)		 39°C
(103°F)		 38°C
(101°F)		 34°C
(94°F)		 28°C
(82°F)		 21°C
(71°F)		 16°C
(61°F)
Daily mean 10°C
(51°F)		 12°C
(54°F)		 15°C
(58°F)		 19°C
(66°F)		 23°C
(74°F)		 28°C
(83°F)		 32°C
(89°F)		 31°C
(87°F)		 27°C
(81°F)		 20°C
(69°F)		 14°C
(58°F)		 10°C
(50°F)
Average low 6°C
(43°F)		 6°C
(44°F)		 9°C
(48°F)		 12°C
(55°F)		 16°C
(61°F)		 21°C
(70°F)		 24°C
(75°F)		 23°C
(74°F)		 20°C
(68°F)		 13°C
(56°F)		 9°C
(48°F)		 5°C
(42°F)
Mean minimum 1°C
(34°F)		 1°C
(33°F)		 4°C
(39°F)		 7°C
(45°F)		 11°C
(52°F)		 14°C
(57°F)		 20°C
(69°F)		 19°C
(66°F)		 14°C
(58°F)		 8°C
(47°F)		 3°C
(38°F)		 1°C
(34°F)
Minimum -2°C
(29°F)		 -1°C
(30°F)		 2°C
(36°F)		 5°C
(42°F)		 9°C
(48°F)		 12°C
(53°F)		 19°C
(66°F)		 18°C
(64°F)		 11°C
(53°F)		 7°C
(44°F)		 2°C
(35°F)		 -1°C
(30°F)

Compare climate in Riverdale with other places

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

Monthly average precipitation in Riverdale, California, United States §

Riverdale usually has the most precipitation in January, February and March, with an average of 7 rainy days and 64 mm (2.5 inches) of precipitation per month.The driest months in Riverdale 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 Riverdale, 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) 64 (2.5) 54 (2.1) 75 (2.9) 30 (1.2) 20 (0.8) 1 (0.0) 0 (0.0) 0 (0.0) 1 (0.0) 11 (0.4) 29 (1.1) 51 (2.0)
Average precipitation days (≥ 1 mm) 6 7 8 4 2 0 0 0 0 1 3 6

Monthly sunshine hours in Riverdale, California, United States §

The sunniest months in Riverdale are May, June and July, when the sun shines an average of 12 hours 22 minutes a day.Least sunny months in Riverdale: January, February and December receive an average of 6 hours 54 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Riverdale, 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 174 232 282 320 369 380 387 360 316 292 245 221
Mean daily daylight hours 9h 58m 10h 51m 11h 59m 13h 8m 14h 7m 14h 35m 14h 19m 13h 27m 12h 21m 11h 12m 10h 12m 9h 42m

Solar UV radiation in Riverdale, California, United States §

Riverdale 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 Riverdale UV Index data.

Average daily maximum UV levels by month for Riverdale, 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