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Monthly climate in Happy Valley, Oregon, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Happy Valley features a warm-summer Mediterranean climate (Csb).Temperatures typically range between 5 °C (41 °F) and 21 °C (70 °F) through the year, but rarely can drop to -13 °C (10 °F) or can rise to as high as 47 °C (117 °F).The average annual precipitation amounts to about 1560 mm (61.4 inches) and receives 155 rainy days on the 1 mm (0.04 inches) threshold annually.Happy Valley enjoys an average of 2722 hours of sunshine throughout the year, and daylight varies from 8 hours 46 minutes to 15 hours 35 minutes per day.

Monthly average temperatures in Happy Valley, Oregon, United States §

The warmest months in Happy Valley are July, August and September, with daily mean temperatures ranging from 18 to 21 °C (64 - 70 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 5 to 5 °C (41 - 41 °F) throughout the day. On average each year, Happy Valley experiences 64 days above 25 °C (77.0 °F) and 32 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Happy Valley, Oregon, 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)		 17°C
(63°F)		 23°C
(74°F)		 28°C
(84°F)		 32°C
(90°F)		 47°C
(117°F)		 38°C
(101°F)		 40°C
(105°F)		 35°C
(96°F)		 26°C
(79°F)		 19°C
(67°F)		 16°C
(61°F)
Mean maximum 13°C
(56°F)		 14°C
(57°F)		 19°C
(67°F)		 25°C
(77°F)		 29°C
(85°F)		 35°C
(95°F)		 35°C
(96°F)		 38°C
(100°F)		 33°C
(92°F)		 23°C
(74°F)		 17°C
(63°F)		 13°C
(57°F)
Average high 8°C
(47°F)		 8°C
(47°F)		 12°C
(54°F)		 16°C
(61°F)		 20°C
(68°F)		 24°C
(75°F)		 28°C
(83°F)		 29°C
(84°F)		 24°C
(75°F)		 17°C
(62°F)		 11°C
(53°F)		 8°C
(46°F)
Daily mean 5°C
(41°F)		 5°C
(41°F)		 8°C
(46°F)		 11°C
(51°F)		 14°C
(58°F)		 18°C
(64°F)		 21°C
(69°F)		 21°C
(70°F)		 18°C
(64°F)		 11°C
(53°F)		 8°C
(46°F)		 5°C
(41°F)
Average low 3°C
(37°F)		 2°C
(35°F)		 4°C
(39°F)		 6°C
(42°F)		 9°C
(49°F)		 12°C
(54°F)		 14°C
(57°F)		 14°C
(58°F)		 12°C
(54°F)		 7°C
(45°F)		 5°C
(41°F)		 3°C
(37°F)
Mean minimum -5°C
(23°F)		 -6°C
(22°F)		 -2°C
(28°F)		 0°C
(33°F)		 4°C
(39°F)		 7°C
(46°F)		 10°C
(50°F)		 9°C
(49°F)		 6°C
(44°F)		 0°C
(32°F)		 -2°C
(29°F)		 -4°C
(25°F)
Minimum -13°C
(10°F)		 -10°C
(14°F)		 -4°C
(24°F)		 -1°C
(30°F)		 3°C
(37°F)		 6°C
(43°F)		 9°C
(49°F)		 8°C
(47°F)		 5°C
(42°F)		 -2°C
(28°F)		 -4°C
(26°F)		 -6°C
(21°F)

Compare climate in Happy Valley with other places

Compare temperature, precipitation, sunshine, UV index in Happy Valley, Oregon, United States with other places around the world.

Monthly average precipitation in Happy Valley, Oregon, United States §

Happy Valley usually has the most precipitation in February, November and December, with an average of 19 rainy days and 222 mm (8.8 inches) of precipitation per month.The driest months in Happy Valley are June, July and August. On average, 26 mm (1.0 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Happy Valley, Oregon, 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) 203 (8.0) 227 (9.0) 161 (6.3) 142 (5.6) 71 (2.8) 59 (2.3) 7 (0.3) 10 (0.4) 83 (3.3) 155 (6.1) 207 (8.1) 233 (9.2)
Average precipitation days (≥ 1 mm) 17 20 18 16 11 9 2 3 8 13 18 20

Monthly sunshine hours in Happy Valley, Oregon, United States §

The sunniest months in Happy Valley are June, July and August, when the sun shines an average of 11 hours 26 minutes a day.Least sunny months in Happy Valley: 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 Happy Valley, Oregon, 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 10m 10h 24m 11h 57m 13h 33m 14h 54m 15h 35m 15h 12m 13h 59m 12h 27m 10h 52m 9h 29m 8h 46m

Solar UV radiation in Happy Valley, Oregon, United States §

Happy Valley 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 Happy Valley UV Index data.

Average daily maximum UV levels by month for Happy Valley, Oregon, 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