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Monthly climate in Black Diamond, Washington, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Black Diamond features a warm-summer Mediterranean climate (Csb).Temperatures typically range between 3 °C (37 °F) and 18 °C (64 °F) through the year, but rarely can drop to -15 °C (5 °F) or can rise to as high as 42 °C (108 °F).The average annual precipitation amounts to about 1723 mm (67.8 inches) and receives 172 rainy days on the 1 mm (0.04 inches) threshold annually.Black Diamond enjoys an average of 2594 hours of sunshine throughout the year, and daylight varies from 8 hours 31 minutes to 15 hours 51 minutes per day.

Monthly average temperatures in Black Diamond, Washington, United States §

The warmest months in Black Diamond are June, July and August, with daily mean temperatures ranging from 15 to 18 °C (59 - 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 (37 - 39 °F) throughout the day. On average each year, Black Diamond experiences 26 days above 25 °C (77.0 °F) and 52 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Black Diamond, 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)		 15°C
(60°F)		 23°C
(74°F)		 28°C
(83°F)		 29°C
(85°F)		 42°C
(108°F)		 32°C
(89°F)		 34°C
(93°F)		 31°C
(89°F)		 24°C
(75°F)		 17°C
(64°F)		 14°C
(58°F)
Mean maximum 13°C
(55°F)		 12°C
(54°F)		 17°C
(63°F)		 23°C
(73°F)		 26°C
(78°F)		 29°C
(85°F)		 30°C
(86°F)		 32°C
(90°F)		 27°C
(82°F)		 20°C
(69°F)		 16°C
(60°F)		 12°C
(54°F)
Average high 7°C
(45°F)		 6°C
(43°F)		 10°C
(50°F)		 13°C
(56°F)		 17°C
(63°F)		 19°C
(67°F)		 23°C
(73°F)		 24°C
(75°F)		 20°C
(68°F)		 14°C
(57°F)		 10°C
(50°F)		 6°C
(44°F)
Daily mean 4°C
(39°F)		 3°C
(37°F)		 5°C
(42°F)		 8°C
(47°F)		 12°C
(54°F)		 15°C
(59°F)		 17°C
(64°F)		 18°C
(64°F)		 15°C
(59°F)		 9°C
(48°F)		 6°C
(43°F)		 4°C
(39°F)
Average low 1°C
(35°F)		 -0°C
(32°F)		 2°C
(35°F)		 4°C
(39°F)		 7°C
(45°F)		 10°C
(50°F)		 12°C
(53°F)		 12°C
(54°F)		 10°C
(50°F)		 5°C
(41°F)		 3°C
(38°F)		 1°C
(34°F)
Mean minimum -7°C
(20°F)		 -8°C
(18°F)		 -3°C
(26°F)		 -2°C
(29°F)		 2°C
(36°F)		 5°C
(42°F)		 8°C
(47°F)		 7°C
(45°F)		 5°C
(41°F)		 -2°C
(29°F)		 -3°C
(26°F)		 -6°C
(21°F)
Minimum -14°C
(7°F)		 -15°C
(5°F)		 -5°C
(22°F)		 -4°C
(26°F)		 -0°C
(32°F)		 4°C
(40°F)		 7°C
(45°F)		 6°C
(43°F)		 3°C
(38°F)		 -4°C
(24°F)		 -4°C
(24°F)		 -14°C
(7°F)

Compare climate in Black Diamond with other places

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

Monthly average precipitation in Black Diamond, Washington, United States §

Black Diamond usually has the most precipitation in February, November and December, with an average of 19 rainy days and 238 mm (9.4 inches) of precipitation per month.The driest months in Black Diamond are June, July and August. On average, 39 mm (1.5 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Black Diamond, 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) 206 (8.1) 246 (9.7) 160 (6.3) 142 (5.6) 84 (3.3) 75 (2.9) 21 (0.8) 21 (0.8) 105 (4.1) 197 (7.7) 223 (8.8) 244 (9.6)
Average precipitation days (≥ 1 mm) 17 20 18 16 13 11 5 5 12 16 19 20

Monthly sunshine hours in Black Diamond, Washington, United States §

The sunniest months in Black Diamond are June, July and August, when the sun shines an average of 11 hours 16 minutes a day.Least sunny months in Black Diamond: January, November and December receive an average of 2 hours 59 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Black Diamond, 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 78 110 193 229 304 317 377 342 258 184 109 87
Mean daily daylight hours 8h 57m 10h 17m 11h 57m 13h 39m 15h 7m 15h 51m 15h 27m 14h 8m 12h 29m 10h 47m 9h 17m 8h 31m

Solar UV radiation in Black Diamond, Washington, United States §

Black Diamond experiences the highest level of ultraviolet (UV) radiation in May, June and July, when the maximum UV index can reach values of 9 - 9, 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 Black Diamond UV Index data.

Average daily maximum UV levels by month for Black Diamond, 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 9 8 7 5 3 2