30-year climate normals

Grant County Climate and Weather Averages

Hottest month — July

89.3°

average daily high. The coldest month is January, averaging a low of 23.5°F.

Grant County gets 7.58" 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	35.6°	23.5°	0.91"
February	43.2°	26.7°	0.64"
March	54.0°	31.9°	0.70"
April	63.1°	38.5°	0.58"
May	73.3°	47.6°	0.75"
June	80.0°	54.4°	0.65"
July	89.3°	61.3°	0.30"
August	87.9°	59.4°	0.18"
September	78.5°	50.6°	0.22"
October	62.4°	39.3°	0.66"
November	45.7°	29.5°	0.86"
December	35.5°	23.6°	1.13"

Rainfall by month

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

January 0.91"

February 0.64"

March 0.70"

April 0.58"

May 0.75"

June 0.65"

July 0.30"

August 0.18"

September 0.22"

October 0.66"

November 0.86"

December 1.13"

Annual total 7.58"

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 843

Heating degree days How much heating the climate demands 5,753

Approximate annual cooling cost At 14.95¢/kWh, Washington average $126

Approximate annual electric heating cost Lower where heating is gas rather than electric $301

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 Grant County, where electricity is one line of eight.

Common questions

What is the weather like in Grant County?

Grant County averages a high of 89.3°F in July and a low of 23.5°F in January. Annual precipitation is 7.58 inches, with essentially no snow.

When is the rainy season in Grant 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 Grant County?

The average daily high in July, the hottest month, is 89.3°F. That drives 843 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Grant County?

Effectively no. Measurable snowfall is rare in Grant County.

Sources

Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station EPHRATA MUNI AP, WA US (USW00024141), 6.9 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.