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Monthly climate in Heppner, Oregon, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Heppner features a warm-summer Mediterranean climate (Csb).Temperatures typically range between 0 °C (33 °F) and 22 °C (72 °F) through the year, but rarely can drop to -22 °C (-8 °F) or can rise to as high as 42 °C (108 °F).The average annual precipitation amounts to about 566 mm (22.3 inches) and receives 110 rainy days on the 1 mm (0.04 inches) threshold annually.Heppner enjoys an average of 3152 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 Heppner, Oregon, United States §

The warmest months in Heppner are June, July and August, with daily mean temperatures ranging from 17 to 22 °C (63 - 72 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 0 to 0 °C (33 - 33 °F) throughout the day. On average each year, Heppner experiences 65 days above 25 °C (77.0 °F) and 103 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Heppner, 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 14°C
(58°F)		 16°C
(61°F)		 19°C
(66°F)		 27°C
(82°F)		 30°C
(87°F)		 42°C
(108°F)		 38°C
(100°F)		 38°C
(100°F)		 35°C
(96°F)		 28°C
(82°F)		 20°C
(68°F)		 17°C
(62°F)
Mean maximum 10°C
(50°F)		 13°C
(56°F)		 17°C
(62°F)		 22°C
(73°F)		 27°C
(81°F)		 32°C
(89°F)		 36°C
(96°F)		 36°C
(97°F)		 32°C
(90°F)		 22°C
(73°F)		 17°C
(62°F)		 13°C
(55°F)
Average high 3°C
(39°F)		 4°C
(40°F)		 9°C
(48°F)		 13°C
(56°F)		 18°C
(65°F)		 23°C
(74°F)		 29°C
(85°F)		 29°C
(84°F)		 23°C
(73°F)		 14°C
(58°F)		 8°C
(47°F)		 3°C
(38°F)
Daily mean 0°C
(33°F)		 0°C
(33°F)		 4°C
(39°F)		 8°C
(46°F)		 12°C
(55°F)		 17°C
(63°F)		 22°C
(72°F)		 22°C
(71°F)		 16°C
(61°F)		 9°C
(48°F)		 4°C
(39°F)		 0°C
(33°F)
Average low -2°C
(28°F)		 -3°C
(27°F)		 -0°C
(32°F)		 2°C
(36°F)		 6°C
(44°F)		 10°C
(50°F)		 14°C
(57°F)		 14°C
(58°F)		 10°C
(50°F)		 3°C
(39°F)		 0°C
(33°F)		 -2°C
(28°F)
Mean minimum -14°C
(8°F)		 -13°C
(9°F)		 -8°C
(17°F)		 -4°C
(26°F)		 -0°C
(31°F)		 4°C
(39°F)		 8°C
(46°F)		 7°C
(45°F)		 3°C
(37°F)		 -5°C
(23°F)		 -7°C
(20°F)		 -12°C
(11°F)
Minimum -22°C
(-8°F)		 -19°C
(-1°F)		 -14°C
(8°F)		 -6°C
(21°F)		 -2°C
(28°F)		 3°C
(38°F)		 6°C
(42°F)		 6°C
(43°F)		 -0°C
(32°F)		 -11°C
(13°F)		 -9°C
(16°F)		 -18°C
(-1°F)

Compare climate in Heppner with other places

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

Monthly average precipitation in Heppner, Oregon, United States §

Heppner usually has the most precipitation in February, March and April, with an average of 14 rainy days and 74 mm (2.9 inches) of precipitation per month.The driest months in Heppner are July, August and September. On average, 13 mm (0.5 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Heppner, 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) 60 (2.3) 85 (3.3) 69 (2.7) 69 (2.7) 47 (1.8) 27 (1.1) 2 (0.1) 10 (0.4) 27 (1.1) 46 (1.8) 65 (2.5) 61 (2.4)
Average precipitation days (≥ 1 mm) 13 16 14 13 10 6 0 2 4 8 11 13

Monthly sunshine hours in Heppner, Oregon, United States §

The sunniest months in Heppner are June, July and August, when the sun shines an average of 12 hours 24 minutes a day.Least sunny months in Heppner: January, February and December receive an average of 4 hours 44 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Heppner, 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 116 161 243 279 340 369 411 360 296 244 174 153
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 Heppner, Oregon, United States §

Heppner 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 Heppner UV Index data.

Average daily maximum UV levels by month for Heppner, 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) 3 4 6 8 9 10 10 9 8 5 3 2