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Monthly climate in Rosalia, Washington, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Rosalia features a warm-summer Mediterranean climate (Csb).Temperatures typically range between 0 °C (32 °F) and 23 °C (74 °F) through the year, but rarely can drop to -20 °C (-3 °F) or can rise to as high as 43 °C (110 °F).The average annual precipitation amounts to about 616 mm (24.3 inches) and receives 109 rainy days on the 1 mm (0.04 inches) threshold annually.Rosalia enjoys an average of 3015 hours of sunshine throughout the year, and daylight varies from 8 hours 31 minutes to 15 hours 50 minutes per day.

Monthly average temperatures in Rosalia, Washington, United States §

The warmest months in Rosalia are June, July and August, with daily mean temperatures ranging from 18 to 23 °C (65 - 74 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 0 to 0 °C (32 - 33 °F) throughout the day. On average each year, Rosalia experiences 68 days above 25 °C (77.0 °F) and 85 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Rosalia, Washington, 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)		 15°C
(60°F)		 19°C
(67°F)		 28°C
(83°F)		 31°C
(88°F)		 43°C
(110°F)		 40°C
(105°F)		 39°C
(103°F)		 35°C
(95°F)		 27°C
(82°F)		 17°C
(63°F)		 17°C
(62°F)
Mean maximum 9°C
(48°F)		 12°C
(53°F)		 17°C
(62°F)		 22°C
(72°F)		 28°C
(82°F)		 31°C
(89°F)		 37°C
(98°F)		 38°C
(100°F)		 32°C
(90°F)		 22°C
(72°F)		 15°C
(60°F)		 11°C
(52°F)
Average high 3°C
(37°F)		 3°C
(38°F)		 9°C
(49°F)		 14°C
(57°F)		 19°C
(67°F)		 24°C
(75°F)		 30°C
(86°F)		 29°C
(85°F)		 23°C
(73°F)		 14°C
(58°F)		 8°C
(46°F)		 3°C
(37°F)
Daily mean 0°C
(33°F)		 -0°C
(32°F)		 5°C
(41°F)		 9°C
(48°F)		 14°C
(57°F)		 18°C
(65°F)		 23°C
(74°F)		 23°C
(73°F)		 17°C
(63°F)		 9°C
(48°F)		 4°C
(40°F)		 0°C
(33°F)
Average low -2°C
(29°F)		 -3°C
(26°F)		 1°C
(33°F)		 4°C
(39°F)		 9°C
(48°F)		 12°C
(54°F)		 16°C
(61°F)		 16°C
(61°F)		 11°C
(52°F)		 4°C
(40°F)		 1°C
(34°F)		 -2°C
(29°F)
Mean minimum -11°C
(12°F)		 -13°C
(9°F)		 -7°C
(19°F)		 -3°C
(27°F)		 3°C
(37°F)		 7°C
(45°F)		 11°C
(52°F)		 10°C
(50°F)		 5°C
(41°F)		 -5°C
(24°F)		 -6°C
(22°F)		 -10°C
(15°F)
Minimum -20°C
(-3°F)		 -16°C
(3°F)		 -14°C
(6°F)		 -5°C
(22°F)		 1°C
(34°F)		 6°C
(43°F)		 10°C
(50°F)		 7°C
(45°F)		 2°C
(35°F)		 -13°C
(9°F)		 -8°C
(18°F)		 -16°C
(3°F)

Compare climate in Rosalia with other places

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

Monthly average precipitation in Rosalia, Washington, United States §

Rosalia usually has the most precipitation in February, November and December, with an average of 14 rainy days and 81 mm (3.2 inches) of precipitation per month.The driest months in Rosalia are June, July and August. On average, 12 mm (0.5 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Rosalia, Washington, 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) 72 (2.9) 79 (3.1) 63 (2.5) 57 (2.2) 55 (2.1) 25 (1.0) 3 (0.1) 9 (0.4) 27 (1.1) 61 (2.4) 87 (3.4) 78 (3.1)
Average precipitation days (≥ 1 mm) 13 15 13 11 8 4 0 3 4 10 14 14

Monthly sunshine hours in Rosalia, Washington, United States §

The sunniest months in Rosalia are June, July and August, when the sun shines an average of 12 hours 16 minutes a day.Least sunny months in Rosalia: January, February and December receive an average of 3 hours 57 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Rosalia, Washington, 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 100 144 225 277 339 360 412 356 288 235 160 115
Mean daily daylight hours 8h 57m 10h 17m 11h 57m 13h 39m 15h 6m 15h 50m 15h 26m 14h 7m 12h 29m 10h 47m 9h 18m 8h 31m

Solar UV radiation in Rosalia, Washington, United States §

Rosalia experiences the highest level of ultraviolet (UV) radiation in June, July and August, when the maximum UV index can reach values of 9 - 10, which corresponds to the Very High category of sun exposure.January, November and December are in the Low / Moderate exposure category. In these months, the maximum values of the UV index do not exceed 3. For more detailed information, check out our hourly Rosalia UV Index data.

Average daily maximum UV levels by month for Rosalia, Washington, 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) 2 4 5 7 8 9 10 9 7 5 3 2