30-year climate normals

Jefferson County Climate and Weather Averages

Hottest month — July

82.9°

average daily high. The coldest month is January, averaging a low of 19.2°F.

Jefferson County gets 43.16" of precipitation a year, and 31% of it falls in May, Jun, Jul.

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	36.5°	19.2°	3.46"
February	40.0°	20.6°	2.51"
March	48.9°	27.1°	3.24"
April	62.2°	37.8°	3.65"
May	71.7°	48.9°	4.29"
June	79.4°	57.9°	4.90"
July	82.9°	62.5°	4.02"
August	81.9°	60.8°	3.54"
September	75.5°	54.1°	3.81"
October	63.5°	42.0°	3.42"
November	51.0°	31.9°	3.17"
December	41.0°	25.0°	3.15"

Rainfall by month

Precipitation is spread fairly evenly through the year here, with 31% falling in the wettest three months (May, Jun, Jul).

January 3.46"

February 2.51"

March 3.24"

April 3.65"

May 4.29"

June 4.90"

July 4.02"

August 3.54"

September 3.81"

October 3.42"

November 3.17"

December 3.15"

Annual total 43.16"

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 733

Heating degree days How much heating the climate demands 5,828

Approximate annual cooling cost At 19.52¢/kWh, Ohio average $143

Approximate annual electric heating cost Lower where heating is gas rather than electric $398

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 Jefferson County, where electricity is one line of eight.

Common questions

What is the weather like in Jefferson County?

Jefferson County averages a high of 82.9°F in July and a low of 19.2°F in January. Annual precipitation is 43.16 inches, with essentially no snow.

When is the rainy season in Jefferson County?

The wettest stretch is May, Jun, Jul, which accounts for 31% of the year's precipitation. Precipitation is relatively evenly distributed across the year.

How hot does it get in Jefferson County?

The average daily high in July, the hottest month, is 82.9°F. That drives 733 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Jefferson County?

Effectively no. Measurable snowfall is rare in Jefferson County.

Sources

Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station STEUBENVILLE, OH US (USC00338025), 7.3 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, Ohio residential average.
Wet-season share is the wettest three consecutive months as a percentage of annual precipitation, calculated from the monthly normals.