30-year climate normals

Wasco County Climate and Weather Averages

Hottest month — July

88.4°

average daily high. The coldest month is January, averaging a low of 30.9°F.

Wasco County gets 13.65" of precipitation a year, and 52% 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	42.1°	30.9°	2.38"
February	48.4°	32.1°	1.58"
March	56.7°	36.2°	1.18"
April	64.2°	41.7°	0.83"
May	73.5°	49.0°	0.76"
June	79.1°	55.1°	0.48"
July	88.4°	61.0°	0.16"
August	87.9°	60.3°	0.16"
September	80.4°	52.2°	0.33"
October	65.5°	42.6°	1.14"
November	50.2°	35.1°	1.97"
December	41.4°	31.0°	2.68"

Rainfall by month

Wasco County has a distinct wet season. 52% of the year's precipitation arrives in Nov, Dec, Jan.

January 2.38"

February 1.58"

March 1.18"

April 0.83"

May 0.76"

June 0.48"

July 0.16"

August 0.16"

September 0.33"

October 1.14"

November 1.97"

December 2.68"

Annual total 13.65"

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 830

Heating degree days How much heating the climate demands 4,677

Approximate annual cooling cost At 16.27¢/kWh, Oregon average $135

Approximate annual electric heating cost Lower where heating is gas rather than electric $266

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 Wasco County, where electricity is one line of eight.

Common questions

What is the weather like in Wasco County?

Wasco County averages a high of 88.4°F in July and a low of 30.9°F in January. Annual precipitation is 13.65 inches, with essentially no snow.

When is the rainy season in Wasco County?

The wettest stretch is Nov, Dec, Jan, which accounts for 52% of the year's precipitation. That is a pronounced wet season rather than rain spread evenly through the year.

How hot does it get in Wasco County?

The average daily high in July, the hottest month, is 88.4°F. That drives 830 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Wasco County?

Effectively no. Measurable snowfall is rare in Wasco County.

Sources

Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station THE DALLES MUNI AP, WA US (USW00024219), 31.4 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, Oregon residential average.
Wet-season share is the wettest three consecutive months as a percentage of annual precipitation, calculated from the monthly normals.