30-year climate normals

Benton County Climate and Weather Averages

Hottest month — July

92.5°

average daily high. The coldest month is December, averaging a low of 27.3°F.

Benton County gets 7.62" of precipitation a year, and 38% 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	41.4°	27.8°	1.03"
February	48.6°	28.2°	0.63"
March	58.6°	33.1°	0.69"
April	67.0°	38.4°	0.66"
May	76.5°	46.3°	0.71"
June	83.1°	52.6°	0.61"
July	92.5°	56.9°	0.15"
August	90.7°	55.7°	0.27"
September	80.9°	47.6°	0.31"
October	65.8°	38.4°	0.66"
November	49.9°	31.9°	0.87"
December	41.0°	27.3°	1.03"

Rainfall by month

Precipitation is spread fairly evenly through the year here, with 38% falling in the wettest three months (Nov, Dec, Jan).

January 1.03"

February 0.63"

March 0.69"

April 0.66"

May 0.71"

June 0.61"

July 0.15"

August 0.27"

September 0.31"

October 0.66"

November 0.87"

December 1.03"

Annual total 7.62"

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 788

Heating degree days How much heating the climate demands 5,011

Approximate annual cooling cost At 14.95¢/kWh, Washington average $118

Approximate annual electric heating cost Lower where heating is gas rather than electric $262

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 Benton County, where electricity is one line of eight.

Common questions

What is the weather like in Benton County?

Benton County averages a high of 92.5°F in July and a low of 27.3°F in December. Annual precipitation is 7.62 inches, with essentially no snow.

When is the rainy season in Benton County?

The wettest stretch is Nov, Dec, Jan, which accounts for 38% of the year's precipitation. Precipitation is relatively evenly distributed across the year.

How hot does it get in Benton County?

The average daily high in July, the hottest month, is 92.5°F. That drives 788 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Benton County?

Effectively no. Measurable snowfall is rare in Benton County.

Sources

Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station PASCO TRI CITIES AP, WA US (USW00024163), 19.3 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.