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Monthly climate in Royal City, Washington, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Royal City features a cold semi-arid climate (BSk).Temperatures typically range between 0 °C (32 °F) and 26 °C (78 °F) through the year, but rarely can drop to -23 °C (-8 °F) or can rise to as high as 46 °C (116 °F).The average annual precipitation amounts to about 265 mm (10.4 inches) and receives 59 rainy days on the 1 mm (0.04 inches) threshold annually.Royal City enjoys an average of 3179 hours of sunshine throughout the year, and daylight varies from 8 hours 34 minutes to 15 hours 48 minutes per day.

Monthly average temperatures in Royal City, Washington, United States §

The warmest months in Royal City are June, July and August, with daily mean temperatures ranging from 22 to 26 °C (71 - 78 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 0 to 1 °C (32 - 33 °F) throughout the day. On average each year, Royal City experiences 98 days above 25 °C (77.0 °F) and 88 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Royal City, 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 13°C
(56°F)		 17°C
(63°F)		 21°C
(71°F)		 30°C
(87°F)		 35°C
(96°F)		 46°C
(116°F)		 44°C
(111°F)		 41°C
(106°F)		 38°C
(100°F)		 31°C
(88°F)		 21°C
(70°F)		 19°C
(66°F)
Mean maximum 10°C
(50°F)		 12°C
(54°F)		 20°C
(68°F)		 25°C
(78°F)		 33°C
(91°F)		 36°C
(97°F)		 40°C
(105°F)		 40°C
(104°F)		 35°C
(95°F)		 25°C
(78°F)		 18°C
(65°F)		 13°C
(56°F)
Average high 3°C
(38°F)		 5°C
(42°F)		 12°C
(54°F)		 18°C
(64°F)		 24°C
(76°F)		 28°C
(83°F)		 33°C
(92°F)		 33°C
(91°F)		 26°C
(79°F)		 17°C
(62°F)		 9°C
(48°F)		 3°C
(38°F)
Daily mean -0°C
(32°F)		 1°C
(33°F)		 7°C
(44°F)		 12°C
(53°F)		 18°C
(64°F)		 22°C
(71°F)		 26°C
(78°F)		 25°C
(77°F)		 19°C
(67°F)		 11°C
(52°F)		 5°C
(40°F)		 1°C
(33°F)
Average low -3°C
(26°F)		 -3°C
(26°F)		 1°C
(35°F)		 6°C
(43°F)		 11°C
(52°F)		 15°C
(59°F)		 17°C
(63°F)		 17°C
(63°F)		 12°C
(55°F)		 6°C
(42°F)		 1°C
(34°F)		 -2°C
(29°F)
Mean minimum -10°C
(14°F)		 -9°C
(15°F)		 -6°C
(22°F)		 -0°C
(32°F)		 5°C
(41°F)		 9°C
(49°F)		 13°C
(55°F)		 11°C
(52°F)		 6°C
(44°F)		 -2°C
(29°F)		 -5°C
(24°F)		 -8°C
(18°F)
Minimum -23°C
(-8°F)		 -13°C
(9°F)		 -15°C
(5°F)		 -3°C
(27°F)		 3°C
(38°F)		 9°C
(48°F)		 12°C
(54°F)		 10°C
(51°F)		 4°C
(39°F)		 -6°C
(21°F)		 -6°C
(21°F)		 -11°C
(13°F)

Compare climate in Royal City with other places

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

Monthly average precipitation in Royal City, Washington, United States §

Royal City usually has the most precipitation in January, February and December, with an average of 9 rainy days and 38 mm (1.5 inches) of precipitation per month.The driest months in Royal City are June, July and August. On average, 3 mm (0.1 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Royal City, 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) 43 (1.7) 37 (1.5) 24 (1.0) 24 (1.0) 14 (0.6) 6 (0.2) 1 (0.0) 3 (0.1) 12 (0.5) 30 (1.2) 35 (1.4) 36 (1.4)
Average precipitation days (≥ 1 mm) 10 8 6 5 3 1 0 0 3 6 8 9

Monthly sunshine hours in Royal City, Washington, United States §

The sunniest months in Royal City are May, June and July, when the sun shines an average of 12 hours 40 minutes a day.Least sunny months in Royal City: January, November and December receive an average of 4 hours 12 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Royal City, 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 94 172 251 301 363 383 418 362 293 245 164 127
Mean daily daylight hours 9h 0m 10h 18m 11h 57m 13h 38m 15h 4m 15h 48m 15h 23m 14h 6m 12h 29m 10h 49m 9h 20m 8h 34m

Solar UV radiation in Royal City, Washington, United States §

Royal City 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, February 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 Royal City UV Index data.

Average daily maximum UV levels by month for Royal City, 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 3 5 6 8 9 10 9 7 5 3 2