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Monthly climate in Helena, Oklahoma, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Helena features a humid subtropical climate (Cfa).Temperatures typically range between 3 °C (37 °F) and 28 °C (83 °F) through the year, but rarely can drop to -24 °C (-11 °F) or can rise to as high as 42 °C (108 °F).The average annual precipitation amounts to about 781 mm (30.7 inches) and receives 80 rainy days on the 1 mm (0.04 inches) threshold annually.Helena enjoys an average of 3318 hours of sunshine throughout the year, and daylight varies from 9 hours 41 minutes to 14 hours 36 minutes per day.

Monthly average temperatures in Helena, Oklahoma, United States §

The warmest months in Helena are June, July and August, with daily mean temperatures ranging from 26 to 28 °C (80 - 83 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 3 to 5 °C (37 - 42 °F) throughout the day. On average each year, Helena experiences 143 days above 25 °C (77.0 °F) and 67 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Helena, 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
(76°F)		 29°C
(85°F)		 33°C
(92°F)		 36°C
(97°F)		 36°C
(97°F)		 39°C
(103°F)		 42°C
(108°F)		 41°C
(105°F)		 38°C
(101°F)		 36°C
(97°F)		 28°C
(83°F)		 27°C
(81°F)
Mean maximum 20°C
(68°F)		 25°C
(77°F)		 28°C
(83°F)		 32°C
(89°F)		 33°C
(92°F)		 37°C
(98°F)		 40°C
(103°F)		 38°C
(101°F)		 37°C
(98°F)		 33°C
(92°F)		 26°C
(78°F)		 21°C
(71°F)
Average high 9°C
(49°F)		 10°C
(51°F)		 18°C
(65°F)		 22°C
(71°F)		 26°C
(80°F)		 32°C
(91°F)		 34°C
(94°F)		 33°C
(92°F)		 30°C
(87°F)		 22°C
(73°F)		 16°C
(61°F)		 12°C
(54°F)
Daily mean 3°C
(37°F)		 3°C
(38°F)		 11°C
(52°F)		 15°C
(59°F)		 20°C
(69°F)		 26°C
(80°F)		 28°C
(83°F)		 27°C
(81°F)		 24°C
(76°F)		 16°C
(61°F)		 9°C
(49°F)		 5°C
(42°F)
Average low -3°C
(27°F)		 -2°C
(28°F)		 5°C
(41°F)		 8°C
(47°F)		 15°C
(59°F)		 20°C
(69°F)		 23°C
(73°F)		 21°C
(71°F)		 18°C
(65°F)		 10°C
(50°F)		 3°C
(38°F)		 -0°C
(32°F)
Mean minimum -12°C
(10°F)		 -13°C
(9°F)		 -6°C
(22°F)		 -1°C
(30°F)		 7°C
(44°F)		 16°C
(61°F)		 18°C
(66°F)		 16°C
(61°F)		 10°C
(51°F)		 -1°C
(31°F)		 -5°C
(23°F)		 -9°C
(17°F)
Minimum -17°C
(2°F)		 -24°C
(-11°F)		 -12°C
(10°F)		 -6°C
(22°F)		 4°C
(40°F)		 13°C
(55°F)		 17°C
(62°F)		 14°C
(58°F)		 7°C
(45°F)		 -3°C
(27°F)		 -11°C
(13°F)		 -11°C
(13°F)

Compare climate in Helena with other places

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

Monthly average precipitation in Helena, Oklahoma, United States §

Helena usually has the most precipitation in May, June and October, with an average of 9 rainy days and 114 mm (4.5 inches) of precipitation per month.The driest months in Helena are February, November and December. On average, 25 mm (1.0 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Helena, 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) 35 (1.4) 24 (1.0) 77 (3.0) 82 (3.2) 143 (5.6) 112 (4.4) 45 (1.8) 69 (2.7) 59 (2.3) 86 (3.4) 21 (0.8) 29 (1.2)
Average precipitation days (≥ 1 mm) 4 4 8 8 13 7 7 9 6 8 4 2

Monthly sunshine hours in Helena, Oklahoma, United States §

The sunniest months in Helena are June, July and August, when the sun shines an average of 11 hours 21 minutes a day.Least sunny months in Helena: January, February and December receive an average of 7 hours 3 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Helena, 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 188 215 259 272 301 343 371 329 289 262 244 239
Mean daily daylight hours 9h 58m 10h 51m 11h 59m 13h 9m 14h 7m 14h 36m 14h 20m 13h 28m 12h 21m 11h 12m 10h 12m 9h 41m

Solar UV radiation in Helena, Oklahoma, United States §

Helena experiences the highest level of ultraviolet (UV) radiation in May, June and July, when the maximum UV index can reach values of 11 - 11, which corresponds to the 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 Helena UV Index data.

Average daily maximum UV levels by month for Helena, 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 8 10 11 11 11 10 9 7 5 3