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Monthly climate in Dayton, Washington, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Dayton features a warm-summer Mediterranean climate (Csb).Temperatures typically range between 1 °C (34 °F) and 23 °C (74 °F) through the year, but rarely can drop to -19 °C (-2 °F) or can rise to as high as 43 °C (109 °F).The average annual precipitation amounts to about 639 mm (25.1 inches) and receives 113 rainy days on the 1 mm (0.04 inches) threshold annually.Dayton enjoys an average of 3102 hours of sunshine throughout the year, and daylight varies from 8 hours 39 minutes to 15 hours 43 minutes per day.

Monthly average temperatures in Dayton, Washington, United States §

The warmest months in Dayton are June, July and August, with daily mean temperatures ranging from 18 to 23 °C (65 - 74 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 1 to 1 °C (34 - 35 °F) throughout the day. On average each year, Dayton experiences 70 days above 25 °C (77.0 °F) and 77 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Dayton, 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)		 16°C
(61°F)		 18°C
(65°F)		 27°C
(80°F)		 32°C
(89°F)		 43°C
(109°F)		 39°C
(103°F)		 39°C
(102°F)		 36°C
(96°F)		 28°C
(82°F)		 19°C
(67°F)		 18°C
(64°F)
Mean maximum 11°C
(51°F)		 13°C
(56°F)		 17°C
(63°F)		 23°C
(73°F)		 28°C
(83°F)		 32°C
(89°F)		 37°C
(99°F)		 37°C
(98°F)		 32°C
(90°F)		 22°C
(73°F)		 17°C
(62°F)		 13°C
(55°F)
Average high 4°C
(40°F)		 5°C
(41°F)		 10°C
(50°F)		 14°C
(57°F)		 19°C
(67°F)		 24°C
(76°F)		 30°C
(86°F)		 29°C
(85°F)		 23°C
(74°F)		 15°C
(59°F)		 9°C
(48°F)		 4°C
(39°F)
Daily mean 1°C
(35°F)		 1°C
(34°F)		 5°C
(42°F)		 9°C
(48°F)		 14°C
(57°F)		 18°C
(65°F)		 23°C
(74°F)		 22°C
(73°F)		 17°C
(63°F)		 10°C
(49°F)		 5°C
(41°F)		 1°C
(34°F)
Average low -1°C
(30°F)		 -2°C
(29°F)		 1°C
(34°F)		 4°C
(39°F)		 8°C
(47°F)		 12°C
(53°F)		 15°C
(60°F)		 16°C
(60°F)		 11°C
(52°F)		 5°C
(41°F)		 2°C
(35°F)		 -2°C
(30°F)
Mean minimum -10°C
(15°F)		 -13°C
(10°F)		 -6°C
(22°F)		 -3°C
(27°F)		 2°C
(35°F)		 5°C
(42°F)		 10°C
(50°F)		 9°C
(48°F)		 4°C
(39°F)		 -4°C
(25°F)		 -6°C
(21°F)		 -10°C
(15°F)
Minimum -19°C
(-2°F)		 -16°C
(4°F)		 -11°C
(12°F)		 -8°C
(19°F)		 -0°C
(32°F)		 4°C
(40°F)		 8°C
(46°F)		 7°C
(44°F)		 1°C
(34°F)		 -11°C
(13°F)		 -8°C
(18°F)		 -14°C
(8°F)

Compare climate in Dayton with other places

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

Monthly average precipitation in Dayton, Washington, United States §

Dayton usually has the most precipitation in February, November and December, with an average of 14 rainy days and 86 mm (3.4 inches) of precipitation per month.The driest months in Dayton are July, August and September. On average, 15 mm (0.6 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Dayton, 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) 67 (2.7) 105 (4.1) 71 (2.8) 58 (2.3) 53 (2.1) 30 (1.2) 4 (0.1) 15 (0.6) 26 (1.0) 57 (2.3) 74 (2.9) 78 (3.1)
Average precipitation days (≥ 1 mm) 12 17 13 11 9 6 1 3 4 10 13 14

Monthly sunshine hours in Dayton, Washington, United States §

The sunniest months in Dayton are June, July and August, when the sun shines an average of 12 hours 16 minutes a day.Least sunny months in Dayton: January, February and December receive an average of 4 hours 20 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Dayton, 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 111 147 240 286 343 363 410 354 289 240 177 135
Mean daily daylight hours 9h 3m 10h 20m 11h 57m 13h 36m 15h 0m 15h 43m 15h 19m 14h 3m 12h 28m 10h 50m 9h 23m 8h 39m

Solar UV radiation in Dayton, Washington, United States §

Dayton experiences the highest level of ultraviolet (UV) radiation in May, 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, 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 Dayton UV Index data.

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