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Monthly climate in Roslyn, Washington, United States

Last updated: March 2, 2024

Under the Köppen–Geiger climate classification Roslyn features a warm-summer Mediterranean climate (Csb). Temperatures typically range between -3 °C (26 °F) and 16 °C (61 °F) through the year, but rarely can drop to -21 °C (-6 °F) or can rise to as high as 36 °C (98 °F). The average annual precipitation amounts to about 1054 mm (41.5 inches) and receives 147 rainy days on the 1 mm (0.04 inches) threshold annually. Roslyn enjoys an average of 2801 hours of sunshine throughout the year, and daylight varies from 8 hours 32 minutes to 15 hours 50 minutes per day.

Monthly average temperatures in Roslyn, Washington, United States §

The warmest months in Roslyn are June, July and August, with daily mean temperatures ranging from 12 to 16 °C (54 - 61 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -3 to -3 °C (26 - 27 °F) throughout the day. On average each year, Roslyn experiences 21 days above 25 °C (77.0 °F) and 157 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Roslyn, 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 6°C
(43°F)		 9°C
(48°F)		 15°C
(59°F)		 20°C
(69°F)		 26°C
(79°F)		 36°C
(98°F)		 32°C
(90°F)		 33°C
(91°F)		 31°C
(88°F)		 22°C
(72°F)		 12°C
(54°F)		 11°C
(52°F)
Mean maximum 4°C
(40°F)		 5°C
(42°F)		 10°C
(51°F)		 16°C
(61°F)		 23°C
(74°F)		 27°C
(80°F)		 30°C
(87°F)		 32°C
(89°F)		 27°C
(81°F)		 18°C
(64°F)		 11°C
(52°F)		 6°C
(44°F)
Average high -0°C
(32°F)		 0°C
(32°F)		 4°C
(40°F)		 8°C
(47°F)		 14°C
(58°F)		 17°C
(64°F)		 22°C
(72°F)		 23°C
(74°F)		 18°C
(64°F)		 10°C
(50°F)		 4°C
(39°F)		 -0°C
(32°F)
Daily mean -3°C
(27°F)		 -3°C
(26°F)		 0°C
(33°F)		 3°C
(38°F)		 9°C
(48°F)		 12°C
(54°F)		 15°C
(60°F)		 16°C
(61°F)		 12°C
(53°F)		 5°C
(41°F)		 1°C
(33°F)		 -3°C
(27°F)
Average low -5°C
(22°F)		 -6°C
(21°F)		 -4°C
(26°F)		 -1°C
(31°F)		 3°C
(38°F)		 6°C
(43°F)		 9°C
(48°F)		 9°C
(49°F)		 6°C
(44°F)		 1°C
(33°F)		 -2°C
(29°F)		 -5°C
(23°F)
Mean minimum -16°C
(4°F)		 -16°C
(3°F)		 -10°C
(14°F)		 -7°C
(20°F)		 -2°C
(29°F)		 1°C
(34°F)		 4°C
(39°F)		 4°C
(39°F)		 1°C
(34°F)		 -8°C
(18°F)		 -8°C
(18°F)		 -15°C
(5°F)
Minimum -21°C
(-5°F)		 -21°C
(-6°F)		 -14°C
(6°F)		 -10°C
(13°F)		 -3°C
(27°F)		 -1°C
(30°F)		 3°C
(37°F)		 2°C
(37°F)		 -2°C
(29°F)		 -13°C
(9°F)		 -12°C
(12°F)		 -21°C
(-5°F)

Compare climate in Roslyn with other places

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

Monthly average precipitation in Roslyn, Washington, United States §

Roslyn usually has the most precipitation in January, February and December, with an average of 17 rainy days and 161 mm (6.3 inches) of precipitation per month. The driest months in Roslyn are June, July and August. On average, 18 mm (0.7 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Roslyn, 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) 148 (5.8) 170 (6.7) 94 (3.7) 79 (3.1) 53 (2.1) 38 (1.5) 7 (0.3) 7 (0.3) 51 (2.0) 112 (4.4) 131 (5.1) 164 (6.4)
Average precipitation days (≥ 1 mm) 16 18 16 14 12 9 3 2 9 12 18 18

Monthly sunshine hours in Roslyn, Washington, United States §

The sunniest months in Roslyn are June, July and August, when the sun shines an average of 11 hours 57 minutes a day. Least sunny months in Roslyn: January, February and December receive an average of 3 hours 20 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Roslyn, 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 84 123 210 255 327 346 399 353 274 203 124 96
Mean daily daylight hours 8h 58m 10h 17m 11h 57m 13h 39m 15h 6m 15h 50m 15h 26m 14h 7m 12h 29m 10h 48m 9h 18m 8h 32m

Solar UV radiation in Roslyn, Washington, United States §

Roslyn experiences the highest level of ultraviolet (UV) radiation in May, June and July, when the maximum UV index can reach values of 10 - 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 Roslyn UV Index data.

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

Detailed Monthly Weather Insights for Roslyn, Washington, United States

Discover in-depth weather details for every month in Roslyn. Click through the links below for comprehensive overviews of temperature trends, precipitation levels, sunshine hours, and solar UV radiation specifics. Whether planning a visit or simply curious about Roslyn's climate nuances, these monthly breakdowns provide the information you need for an informed understanding of what to expect throughout the year.

Each link leads to a detailed account of the typical weather conditions for that month, providing both locals and tourists with vital information to plan their daily activities, wardrobe, and travel itineraries accordingly.