30-year climate normals

Okanogan County Climate and Weather Averages

Hottest month — July

89.4°

average daily high. The coldest month is January, averaging a low of 23.3°F.

Okanogan County gets 11.6" of precipitation a year, and 39% of it falls in Nov, Dec, Jan.

Temperature through the year

Each bar spans the average daily low to the average daily high for that month.

Month	Avg high	Avg low	Precip
January	32.8°	23.3°	1.33"
February	39.8°	25.2°	0.91"
March	52.5°	31.1°	1.06"
April	62.8°	36.8°	0.83"
May	72.4°	45.1°	1.19"
June	79.1°	51.1°	0.98"
July	89.4°	58.1°	0.52"
August	88.8°	56.8°	0.27"
September	78.2°	48.4°	0.40"
October	60.7°	37.5°	0.92"
November	43.0°	28.9°	1.24"
December	32.5°	23.3°	1.95"

Rainfall by month

Precipitation is spread fairly evenly through the year here, with 39% falling in the wettest three months (Nov, Dec, Jan).

January 1.33"

February 0.91"

March 1.06"

April 0.83"

May 1.19"

June 0.98"

July 0.52"

August 0.27"

September 0.40"

October 0.92"

November 1.24"

December 1.95"

Annual total 11.6"

What this climate costs you

Degree days measure how hard a building has to work to stay comfortable. They are the reason two identical houses have very different power bills, and they are the link between the weather here and what you pay every month.

Cooling degree days How much air conditioning the climate demands 703

Heating degree days How much heating the climate demands 6,177

Approximate annual cooling cost At 14.95¢/kWh, Washington average $105

Approximate annual electric heating cost Lower where heating is gas rather than electric $323

These are rough planning figures from degree days and the state electricity price, not a bill estimate. House size, insulation and fuel type move them a lot. See the full cost of owning a home in Okanogan County, where electricity is one line of eight.

Common questions

What is the weather like in Okanogan County?

Okanogan County averages a high of 89.4°F in July and a low of 23.3°F in January. Annual precipitation is 11.6 inches, with essentially no snow.

When is the rainy season in Okanogan County?

The wettest stretch is Nov, Dec, Jan, which accounts for 39% of the year's precipitation. Precipitation is relatively evenly distributed across the year.

How hot does it get in Okanogan County?

The average daily high in July, the hottest month, is 89.4°F. That drives 703 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Okanogan County?

Effectively no. Measurable snowfall is rare in Okanogan County.

Sources

Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station OMAK AP, WA US (USW00094197), 12 miles from the county centroid.
Heating and cooling degree days — NOAA, same station and period.
Electricity price — US Energy Information Administration, Electric Power Monthly Table 5.6.A, Washington residential average.
Wet-season share is the wettest three consecutive months as a percentage of annual precipitation, calculated from the monthly normals.