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Monthly climate in Saint John, Washington, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Saint John features a warm-summer Mediterranean climate (Csb).Temperatures typically range between 1 °C (34 °F) and 24 °C (76 °F) through the year, but rarely can drop to -18 °C (1 °F) or can rise to as high as 44 °C (111 °F).The average annual precipitation amounts to about 537 mm (21.1 inches) and receives 99 rainy days on the 1 mm (0.04 inches) threshold annually.Saint John enjoys an average of 3101 hours of sunshine throughout the year, and daylight varies from 8 hours 33 minutes to 15 hours 49 minutes per day.

Monthly average temperatures in Saint John, Washington, United States §

The warmest months in Saint John are June, July and August, with daily mean temperatures ranging from 20 to 24 °C (68 - 76 °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, Saint John experiences 76 days above 25 °C (77.0 °F) and 74 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Saint John, 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
(55°F)		 16°C
(62°F)		 20°C
(67°F)		 29°C
(85°F)		 32°C
(90°F)		 44°C
(111°F)		 41°C
(107°F)		 40°C
(104°F)		 36°C
(96°F)		 28°C
(82°F)		 19°C
(66°F)		 17°C
(64°F)
Mean maximum 10°C
(50°F)		 12°C
(55°F)		 18°C
(64°F)		 23°C
(74°F)		 29°C
(84°F)		 33°C
(91°F)		 38°C
(100°F)		 39°C
(102°F)		 33°C
(92°F)		 23°C
(73°F)		 17°C
(62°F)		 12°C
(55°F)
Average high 4°C
(39°F)		 5°C
(40°F)		 10°C
(51°F)		 15°C
(59°F)		 20°C
(69°F)		 25°C
(78°F)		 31°C
(88°F)		 30°C
(87°F)		 24°C
(75°F)		 15°C
(60°F)		 9°C
(48°F)		 4°C
(39°F)
Daily mean 1°C
(35°F)		 1°C
(34°F)		 6°C
(42°F)		 10°C
(50°F)		 15°C
(59°F)		 20°C
(68°F)		 24°C
(76°F)		 24°C
(75°F)		 18°C
(64°F)		 10°C
(50°F)		 5°C
(41°F)		 1°C
(34°F)
Average low -1°C
(30°F)		 -2°C
(28°F)		 2°C
(35°F)		 5°C
(41°F)		 9°C
(49°F)		 13°C
(56°F)		 17°C
(62°F)		 17°C
(62°F)		 12°C
(54°F)		 5°C
(42°F)		 2°C
(36°F)		 -1°C
(30°F)
Mean minimum -10°C
(14°F)		 -11°C
(12°F)		 -6°C
(21°F)		 -2°C
(29°F)		 4°C
(39°F)		 8°C
(46°F)		 12°C
(53°F)		 10°C
(51°F)		 5°C
(42°F)		 -4°C
(25°F)		 -5°C
(22°F)		 -8°C
(18°F)
Minimum -18°C
(1°F)		 -13°C
(9°F)		 -14°C
(7°F)		 -4°C
(24°F)		 2°C
(36°F)		 7°C
(44°F)		 11°C
(52°F)		 8°C
(47°F)		 3°C
(37°F)		 -11°C
(12°F)		 -8°C
(18°F)		 -12°C
(12°F)

Compare climate in Saint John with other places

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

Monthly average precipitation in Saint John, Washington, United States §

Saint John usually has the most precipitation in February, November and December, with an average of 13 rainy days and 73 mm (2.9 inches) of precipitation per month.The driest months in Saint John are June, July and August. On average, 11 mm (0.4 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Saint John, 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) 62 (2.5) 74 (2.9) 56 (2.2) 48 (1.9) 45 (1.8) 20 (0.8) 2 (0.1) 10 (0.4) 22 (0.9) 54 (2.1) 74 (2.9) 70 (2.8)
Average precipitation days (≥ 1 mm) 12 15 11 10 7 4 0 2 4 9 12 13

Monthly sunshine hours in Saint John, Washington, United States §

The sunniest months in Saint John are June, July and August, when the sun shines an average of 12 hours 24 minutes a day.Least sunny months in Saint John: January, February and December receive an average of 4 hours 13 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Saint John, 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 104 153 236 288 350 367 414 359 292 239 168 126
Mean daily daylight hours 8h 58m 10h 18m 11h 57m 13h 38m 15h 5m 15h 49m 15h 25m 14h 7m 12h 29m 10h 48m 9h 19m 8h 33m

Solar UV radiation in Saint John, Washington, United States §

Saint John experiences the highest level of ultraviolet (UV) radiation in June, 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 Saint John UV Index data.

Average daily maximum UV levels by month for Saint John, 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 5 6 8 9 10 9 7 5 3 2