30-year climate normals

Franklin County Climate and Weather Averages

Hottest month — July

89.6°

average daily high. The coldest month is January, averaging a low of 26.6°F.

Franklin County gets 8.83" 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	39.2°	26.6°	1.17"
February	46.1°	28.9°	0.80"
March	55.8°	32.4°	0.84"
April	64.7°	37.3°	0.74"
May	73.8°	44.3°	0.83"
June	80.3°	50.1°	0.58"
July	89.6°	55.2°	0.29"
August	88.1°	54.8°	0.23"
September	79.2°	47.3°	0.30"
October	63.9°	37.6°	0.77"
November	47.6°	31.3°	1.01"
December	38.5°	27.2°	1.27"

Rainfall by month

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

January 1.17"

February 0.80"

March 0.84"

April 0.74"

May 0.83"

June 0.58"

July 0.29"

August 0.23"

September 0.30"

October 0.77"

November 1.01"

December 1.27"

Annual total 8.83"

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 610

Heating degree days How much heating the climate demands 5,450

Approximate annual cooling cost At 14.95¢/kWh, Washington average $91

Approximate annual electric heating cost Lower where heating is gas rather than electric $285

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 Franklin County, where electricity is one line of eight.

Common questions

What is the weather like in Franklin County?

Franklin County averages a high of 89.6°F in July and a low of 26.6°F in January. Annual precipitation is 8.83 inches, with essentially no snow.

When is the rainy season in Franklin 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 Franklin County?

The average daily high in July, the hottest month, is 89.6°F. That drives 610 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Franklin County?

Effectively no. Measurable snowfall is rare in Franklin County.

Sources

Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station CONNELL 1 W, WA US (USC00451690), 8.8 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.