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United States › Ohio › Mercer County › Climate Station CELINA 3 NE, OH US Distance 5.5 mi Normals 1991–2020

30-year climate normals

Mercer County Climate and Weather Averages

Hottest month — July

83.7°

average daily high. The coldest month is January, averaging a low of 18.7°F.

Mercer County gets 39.76" of precipitation a year and 28.8" of snow, and 33% 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.

20° 40° 60° 80° JanFebMarAprMayJunJulAugSepOctNovDec
MonthAvg highAvg low PrecipSnow
January 33.7° 18.7° 2.76" 10.8"
February 37.9° 21.5° 2.32" 7.1"
March 48.8° 29.7° 2.87" 4.1"
April 62.7° 39.7° 3.86" 0.5"
May 73.1° 51.1° 4.05" 0.0"
June 81.0° 60.1° 4.38" 0.0"
July 83.7° 63.0° 4.58" 0.0"
August 82.2° 60.9° 3.56" 0.0"
September 77.3° 54.2° 2.75" 0.0"
October 64.7° 43.7° 2.86" 0.1"
November 50.1° 33.1° 3.15" 1.3"
December 38.3° 24.3° 2.62" 4.9"

Rainfall by month

Precipitation is spread fairly evenly through the year here, with 33% falling in the wettest three months (May, Jun, Jul).

January 2.76"
February 2.32"
March 2.87"
April 3.86"
May 4.05"
June 4.38"
July 4.58"
August 3.56"
September 2.75"
October 2.86"
November 3.15"
December 2.62"
Annual total 39.76"

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 865
Heating degree days How much heating the climate demands 5,789
Approximate annual cooling cost At 19.52¢/kWh, Ohio average $169
Approximate annual electric heating cost Lower where heating is gas rather than electric $396

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 Mercer County, where electricity is one line of eight.

Common questions

What is the weather like in Mercer County?

Mercer County averages a high of 83.7°F in July and a low of 18.7°F in January. Annual precipitation is 39.76 inches, including 28.8 inches of snow.

When is the rainy season in Mercer County?

The wettest stretch is May, Jun, Jul, which accounts for 33% of the year's precipitation. Precipitation is relatively evenly distributed across the year.

How hot does it get in Mercer County?

The average daily high in July, the hottest month, is 83.7°F. That drives 865 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Mercer County?

Yes. Mercer County averages 28.8 inches of snow a year.

Sources

  • Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station CELINA 3 NE, OH US (USC00331390), 5.5 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.