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Monthly climate in Cathlamet, Washington, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Cathlamet features a warm-summer Mediterranean climate (Csb).Temperatures typically range between 5 °C (41 °F) and 17 °C (63 °F) through the year, but rarely can drop to -7 °C (19 °F) or can rise to as high as 36 °C (96 °F).The average annual precipitation amounts to about 1531 mm (60.3 inches) and receives 157 rainy days on the 1 mm (0.04 inches) threshold annually.Cathlamet enjoys an average of 2624 hours of sunshine throughout the year, and daylight varies from 8 hours 39 minutes to 15 hours 42 minutes per day.

Monthly average temperatures in Cathlamet, Washington, United States §

The warmest months in Cathlamet are July, August and September, with daily mean temperatures ranging from 16 to 17 °C (60 - 63 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 5 to 6 °C (41 - 42 °F) throughout the day. On average each year, Cathlamet experiences 10 days above 25 °C (77.0 °F) and 12 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Cathlamet, 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
(57°F)		 13°C
(56°F)		 22°C
(71°F)		 25°C
(77°F)		 27°C
(82°F)		 36°C
(96°F)		 28°C
(83°F)		 32°C
(89°F)		 29°C
(84°F)		 21°C
(71°F)		 16°C
(62°F)		 13°C
(56°F)
Mean maximum 12°C
(54°F)		 12°C
(53°F)		 16°C
(61°F)		 21°C
(69°F)		 24°C
(76°F)		 27°C
(81°F)		 26°C
(79°F)		 30°C
(86°F)		 26°C
(80°F)		 19°C
(66°F)		 15°C
(60°F)		 12°C
(55°F)
Average high 8°C
(46°F)		 7°C
(46°F)		 10°C
(51°F)		 13°C
(55°F)		 16°C
(61°F)		 18°C
(65°F)		 20°C
(69°F)		 21°C
(71°F)		 19°C
(67°F)		 14°C
(58°F)		 10°C
(51°F)		 7°C
(45°F)
Daily mean 6°C
(42°F)		 5°C
(41°F)		 7°C
(45°F)		 10°C
(50°F)		 12°C
(55°F)		 15°C
(59°F)		 16°C
(62°F)		 17°C
(63°F)		 16°C
(60°F)		 11°C
(52°F)		 8°C
(46°F)		 5°C
(41°F)
Average low 3°C
(39°F)		 3°C
(37°F)		 5°C
(40°F)		 7°C
(44°F)		 9°C
(49°F)		 11°C
(53°F)		 13°C
(55°F)		 13°C
(57°F)		 12°C
(55°F)		 8°C
(47°F)		 5°C
(42°F)		 3°C
(38°F)
Mean minimum -2°C
(29°F)		 -2°C
(28°F)		 1°C
(33°F)		 3°C
(37°F)		 6°C
(43°F)		 8°C
(47°F)		 11°C
(52°F)		 10°C
(51°F)		 8°C
(47°F)		 3°C
(38°F)		 1°C
(34°F)		 -2°C
(28°F)
Minimum -7°C
(19°F)		 -4°C
(25°F)		 -2°C
(30°F)		 1°C
(34°F)		 5°C
(41°F)		 8°C
(46°F)		 10°C
(50°F)		 10°C
(50°F)		 6°C
(44°F)		 1°C
(34°F)		 -1°C
(31°F)		 -4°C
(25°F)

Compare climate in Cathlamet with other places

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

Monthly average precipitation in Cathlamet, Washington, United States §

Cathlamet usually has the most precipitation in January, November and December, with an average of 18 rainy days and 218 mm (8.6 inches) of precipitation per month.The driest months in Cathlamet are June, July and August. On average, 29 mm (1.1 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Cathlamet, 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) 214 (8.4) 192 (7.5) 149 (5.9) 134 (5.3) 74 (2.9) 62 (2.5) 11 (0.4) 12 (0.5) 91 (3.6) 151 (5.9) 212 (8.3) 229 (9.0)
Average precipitation days (≥ 1 mm) 17 19 18 15 11 8 3 4 10 13 18 21

Monthly sunshine hours in Cathlamet, Washington, United States §

The sunniest months in Cathlamet are June, July and August, when the sun shines an average of 10 hours 54 minutes a day.Least sunny months in Cathlamet: January, February and December receive an average of 3 hours 29 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Cathlamet, 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 88 127 204 226 286 320 355 327 258 198 128 101
Mean daily daylight hours 9h 4m 10h 21m 11h 57m 13h 35m 15h 0m 15h 42m 15h 18m 14h 3m 12h 28m 10h 50m 9h 24m 8h 39m

Solar UV radiation in Cathlamet, Washington, United States §

Cathlamet 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 Cathlamet UV Index data.

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