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Monthly climate in Walnut Grove, Washington, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Walnut Grove features a warm-summer Mediterranean climate (Csb).Temperatures typically range between 4 °C (40 °F) and 20 °C (69 °F) through the year, but rarely can drop to -13 °C (9 °F) or can rise to as high as 44 °C (112 °F).The average annual precipitation amounts to about 1886 mm (74.3 inches) and receives 160 rainy days on the 1 mm (0.04 inches) threshold annually.Walnut Grove enjoys an average of 2722 hours of sunshine throughout the year, and daylight varies from 8 hours 43 minutes to 15 hours 38 minutes per day.

Monthly average temperatures in Walnut Grove, Washington, United States §

The warmest months in Walnut Grove are July, August and September, with daily mean temperatures ranging from 17 to 20 °C (63 - 69 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 4 to 5 °C (40 - 41 °F) throughout the day. On average each year, Walnut Grove experiences 55 days above 25 °C (77.0 °F) and 31 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Walnut Grove, 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 14°C
(58°F)		 16°C
(62°F)		 22°C
(72°F)		 29°C
(85°F)		 32°C
(90°F)		 44°C
(112°F)		 37°C
(99°F)		 39°C
(103°F)		 35°C
(96°F)		 26°C
(79°F)		 18°C
(65°F)		 15°C
(59°F)
Mean maximum 12°C
(54°F)		 14°C
(57°F)		 19°C
(66°F)		 24°C
(76°F)		 29°C
(84°F)		 34°C
(93°F)		 34°C
(94°F)		 37°C
(99°F)		 33°C
(91°F)		 22°C
(72°F)		 16°C
(62°F)		 13°C
(55°F)
Average high 8°C
(46°F)		 8°C
(46°F)		 12°C
(53°F)		 15°C
(60°F)		 19°C
(67°F)		 22°C
(73°F)		 27°C
(80°F)		 27°C
(82°F)		 23°C
(73°F)		 16°C
(61°F)		 11°C
(52°F)		 7°C
(45°F)
Daily mean 5°C
(41°F)		 4°C
(40°F)		 7°C
(45°F)		 10°C
(50°F)		 14°C
(57°F)		 17°C
(63°F)		 20°C
(68°F)		 20°C
(69°F)		 17°C
(63°F)		 11°C
(52°F)		 7°C
(46°F)		 5°C
(40°F)
Average low 2°C
(36°F)		 1°C
(35°F)		 3°C
(38°F)		 6°C
(42°F)		 9°C
(48°F)		 11°C
(53°F)		 13°C
(56°F)		 14°C
(57°F)		 12°C
(54°F)		 7°C
(44°F)		 4°C
(40°F)		 2°C
(36°F)
Mean minimum -5°C
(23°F)		 -6°C
(22°F)		 -2°C
(29°F)		 1°C
(33°F)		 4°C
(39°F)		 7°C
(45°F)		 10°C
(50°F)		 9°C
(49°F)		 7°C
(45°F)		 0°C
(33°F)		 -1°C
(31°F)		 -4°C
(25°F)
Minimum -13°C
(9°F)		 -11°C
(13°F)		 -4°C
(26°F)		 -1°C
(31°F)		 3°C
(38°F)		 6°C
(44°F)		 8°C
(46°F)		 8°C
(47°F)		 6°C
(42°F)		 -2°C
(29°F)		 -3°C
(27°F)		 -7°C
(20°F)

Compare climate in Walnut Grove with other places

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

Monthly average precipitation in Walnut Grove, Washington, United States §

Walnut Grove usually has the most precipitation in February, November and December, with an average of 20 rainy days and 264 mm (10.4 inches) of precipitation per month.The driest months in Walnut Grove are June, July and August. On average, 33 mm (1.3 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Walnut Grove, 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) 246 (9.7) 260 (10.2) 189 (7.4) 166 (6.5) 86 (3.4) 75 (3.0) 10 (0.4) 13 (0.5) 111 (4.4) 199 (7.8) 260 (10.2) 273 (10.7)
Average precipitation days (≥ 1 mm) 17 21 18 16 11 9 3 3 9 14 19 20

Monthly sunshine hours in Walnut Grove, Washington, United States §

The sunniest months in Walnut Grove are June, July and August, when the sun shines an average of 11 hours 26 minutes a day.Least sunny months in Walnut Grove: January, February and December receive an average of 3 hours 35 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Walnut Grove, 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 88 121 197 237 288 328 383 340 266 212 140 116
Mean daily daylight hours 9h 7m 10h 23m 11h 57m 13h 34m 14h 57m 15h 38m 15h 15m 14h 1m 12h 28m 10h 51m 9h 27m 8h 43m

Solar UV radiation in Walnut Grove, Washington, United States §

Walnut Grove experiences the highest level of ultraviolet (UV) radiation in May, June and July, 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 Walnut Grove UV Index data.

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