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Monthly climate in Stillwater, Oklahoma, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Stillwater features a humid subtropical climate (Cfa).Temperatures typically range between 4 °C (39 °F) and 28 °C (83 °F) through the year, but rarely can drop to -26 °C (-15 °F) or can rise to as high as 42 °C (108 °F).The average annual precipitation amounts to about 1007 mm (39.6 inches) and receives 92 rainy days on the 1 mm (0.04 inches) threshold annually.Stillwater enjoys an average of 3236 hours of sunshine throughout the year, and daylight varies from 9 hours 43 minutes to 14 hours 33 minutes per day.

Monthly average temperatures in Stillwater, Oklahoma, United States §

The warmest months in Stillwater are June, July and August, with daily mean temperatures ranging from 26 to 28 °C (79 - 83 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 4 to 6 °C (39 - 44 °F) throughout the day. On average each year, Stillwater experiences 140 days above 25 °C (77.0 °F) and 54 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Stillwater, Oklahoma, 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 24°C
(75°F)		 30°C
(86°F)		 32°C
(91°F)		 32°C
(89°F)		 34°C
(94°F)		 37°C
(99°F)		 42°C
(108°F)		 38°C
(101°F)		 38°C
(100°F)		 34°C
(93°F)		 27°C
(81°F)		 25°C
(77°F)
Mean maximum 20°C
(68°F)		 24°C
(76°F)		 27°C
(82°F)		 30°C
(86°F)		 33°C
(91°F)		 35°C
(95°F)		 38°C
(101°F)		 37°C
(99°F)		 35°C
(96°F)		 32°C
(90°F)		 25°C
(77°F)		 22°C
(71°F)
Average high 10°C
(50°F)		 11°C
(52°F)		 18°C
(65°F)		 21°C
(71°F)		 26°C
(79°F)		 31°C
(89°F)		 33°C
(92°F)		 32°C
(91°F)		 30°C
(86°F)		 23°C
(73°F)		 16°C
(62°F)		 12°C
(54°F)
Daily mean 4°C
(39°F)		 5°C
(41°F)		 12°C
(53°F)		 15°C
(59°F)		 21°C
(70°F)		 26°C
(79°F)		 28°C
(83°F)		 27°C
(81°F)		 24°C
(76°F)		 16°C
(62°F)		 10°C
(50°F)		 6°C
(44°F)
Average low -1°C
(30°F)		 -1°C
(31°F)		 6°C
(43°F)		 9°C
(49°F)		 16°C
(61°F)		 21°C
(70°F)		 23°C
(74°F)		 22°C
(72°F)		 19°C
(66°F)		 11°C
(52°F)		 4°C
(40°F)		 1°C
(35°F)
Mean minimum -11°C
(12°F)		 -12°C
(10°F)		 -5°C
(24°F)		 -0°C
(32°F)		 7°C
(46°F)		 16°C
(61°F)		 19°C
(67°F)		 17°C
(63°F)		 11°C
(52°F)		 0°C
(33°F)		 -4°C
(24°F)		 -7°C
(20°F)
Minimum -16°C
(4°F)		 -26°C
(-15°F)		 -12°C
(10°F)		 -4°C
(25°F)		 6°C
(42°F)		 13°C
(55°F)		 17°C
(63°F)		 16°C
(62°F)		 7°C
(45°F)		 -2°C
(29°F)		 -9°C
(16°F)		 -9°C
(17°F)

Compare climate in Stillwater with other places

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

Monthly average precipitation in Stillwater, Oklahoma, United States §

Stillwater usually has the most precipitation in April, May and June, with an average of 9 rainy days and 125 mm (4.9 inches) of precipitation per month.The driest months in Stillwater are February, November and December. On average, 39 mm (1.5 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Stillwater, Oklahoma, 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) 57 (2.3) 45 (1.8) 86 (3.4) 123 (4.8) 143 (5.6) 110 (4.3) 90 (3.6) 91 (3.6) 81 (3.2) 108 (4.3) 36 (1.4) 35 (1.4)
Average precipitation days (≥ 1 mm) 5 7 9 8 13 8 8 9 7 9 5 4

Monthly sunshine hours in Stillwater, Oklahoma, United States §

The sunniest months in Stillwater are June, July and August, when the sun shines an average of 11 hours 17 minutes a day.Least sunny months in Stillwater: January, February and December receive an average of 6 hours 43 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Stillwater, Oklahoma, 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 180 194 248 260 295 341 367 330 284 257 237 237
Mean daily daylight hours 10h 0m 10h 52m 11h 59m 13h 7m 14h 5m 14h 33m 14h 18m 13h 27m 12h 21m 11h 13m 10h 13m 9h 43m

Solar UV radiation in Stillwater, Oklahoma, United States §

Stillwater experiences the highest level of ultraviolet (UV) radiation in April, June and July, when the maximum UV index can reach values of 10 - 11, which corresponds to the Very High / Extreme category of sun exposure.January, November and December are in the Moderate exposure category. In these months, the maximum values of the UV index do not exceed 5. For more detailed information, check out our hourly Stillwater UV Index data.

Average daily maximum UV levels by month for Stillwater, Oklahoma, 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) 4 6 7 10 10 11 11 10 9 7 5 3