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Monthly climate in Granite Falls, Washington, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Granite Falls features a warm-summer Mediterranean climate (Csb).Temperatures typically range between 3 °C (38 °F) and 18 °C (64 °F) through the year, but rarely can drop to -15 °C (6 °F) or can rise to as high as 40 °C (104 °F).The average annual precipitation amounts to about 2129 mm (83.8 inches) and receives 173 rainy days on the 1 mm (0.04 inches) threshold annually.Granite Falls enjoys an average of 2583 hours of sunshine throughout the year, and daylight varies from 8 hours 25 minutes to 15 hours 58 minutes per day.

Monthly average temperatures in Granite Falls, Washington, United States §

The warmest months in Granite Falls are June, July and August, with daily mean temperatures ranging from 15 to 18 °C (60 - 64 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 3 to 4 °C (38 - 40 °F) throughout the day. On average each year, Granite Falls experiences 24 days above 25 °C (77.0 °F) and 42 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Granite Falls, 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 15°C
(59°F)		 14°C
(57°F)		 25°C
(77°F)		 27°C
(81°F)		 29°C
(85°F)		 40°C
(104°F)		 33°C
(91°F)		 34°C
(93°F)		 31°C
(88°F)		 23°C
(74°F)		 17°C
(63°F)		 13°C
(56°F)
Mean maximum 13°C
(55°F)		 12°C
(54°F)		 18°C
(64°F)		 22°C
(72°F)		 26°C
(79°F)		 29°C
(84°F)		 30°C
(87°F)		 32°C
(90°F)		 28°C
(82°F)		 20°C
(68°F)		 15°C
(60°F)		 11°C
(52°F)
Average high 7°C
(45°F)		 6°C
(44°F)		 10°C
(51°F)		 14°C
(57°F)		 17°C
(64°F)		 20°C
(68°F)		 23°C
(74°F)		 24°C
(75°F)		 20°C
(68°F)		 14°C
(57°F)		 10°C
(50°F)		 7°C
(44°F)
Daily mean 4°C
(40°F)		 3°C
(38°F)		 6°C
(44°F)		 9°C
(49°F)		 13°C
(55°F)		 15°C
(60°F)		 18°C
(64°F)		 18°C
(64°F)		 15°C
(59°F)		 9°C
(49°F)		 7°C
(44°F)		 4°C
(39°F)
Average low 2°C
(36°F)		 0°C
(33°F)		 3°C
(37°F)		 5°C
(41°F)		 8°C
(47°F)		 11°C
(52°F)		 12°C
(54°F)		 13°C
(55°F)		 11°C
(51°F)		 6°C
(42°F)		 4°C
(39°F)		 2°C
(35°F)
Mean minimum -7°C
(20°F)		 -7°C
(20°F)		 -3°C
(27°F)		 -0°C
(32°F)		 3°C
(38°F)		 6°C
(44°F)		 9°C
(48°F)		 8°C
(46°F)		 6°C
(43°F)		 -1°C
(30°F)		 -2°C
(28°F)		 -6°C
(21°F)
Minimum -15°C
(6°F)		 -13°C
(8°F)		 -6°C
(22°F)		 -3°C
(27°F)		 2°C
(36°F)		 5°C
(41°F)		 8°C
(47°F)		 6°C
(44°F)		 5°C
(40°F)		 -4°C
(25°F)		 -4°C
(26°F)		 -13°C
(8°F)

Compare climate in Granite Falls with other places

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

Monthly average precipitation in Granite Falls, Washington, United States §

Granite Falls usually has the most precipitation in February, November and December, with an average of 20 rainy days and 290 mm (11.4 inches) of precipitation per month.The driest months in Granite Falls are June, July and August. On average, 51 mm (2.0 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Granite Falls, 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) 255 (10.0) 272 (10.7) 203 (8.0) 172 (6.8) 99 (3.9) 89 (3.5) 32 (1.3) 32 (1.3) 131 (5.2) 246 (9.7) 302 (11.9) 295 (11.6)
Average precipitation days (≥ 1 mm) 16 20 18 17 13 10 6 5 12 16 20 20

Monthly sunshine hours in Granite Falls, Washington, United States §

The sunniest months in Granite Falls are June, July and August, when the sun shines an average of 10 hours 52 minutes a day.Least sunny months in Granite Falls: January, November and December receive an average of 3 hours 7 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Granite Falls, 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 82 118 196 237 306 310 359 330 253 182 113 91
Mean daily daylight hours 8h 51m 10h 14m 11h 57m 13h 42m 15h 12m 15h 58m 15h 32m 14h 11m 12h 30m 10h 45m 9h 13m 8h 25m

Solar UV radiation in Granite Falls, Washington, United States §

Granite Falls experiences the highest level of ultraviolet (UV) radiation in June, July and August, when the maximum UV index can reach values of 8 - 9, which corresponds to the Very High category of sun exposure.January, November and December are in the Low exposure category. In these months, the maximum values of the UV index do not exceed 2. For more detailed information, check out our hourly Granite Falls UV Index data.

Average daily maximum UV levels by month for Granite Falls, 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 9 8 7 5 2 2