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United States › Pennsylvania › Mercer County › Climate Station YOUNGSTOWN RGNL AP, OH US Distance 22.1 mi Normals 1991–2020

30-year climate normals

Mercer County Climate and Weather Averages

Hottest month — July

82.7°

average daily high. The coldest month is January, averaging a low of 19.3°F.

Mercer County gets 41.19" of precipitation a year and 67.8" of snow, and 29% 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 34.3° 19.3° 3.03" 19.6"
February 37.3° 20.7° 2.52" 15.1"
March 46.6° 27.8° 3.21" 10.5"
April 60.3° 37.9° 3.75" 2.6"
May 70.9° 47.6° 3.72" 0.0"
June 78.8° 56.2° 3.90" 0.0"
July 82.7° 60.3° 4.27" 0.0"
August 81.1° 58.8° 3.48" 0.0"
September 74.3° 52.1° 3.84" 0.0"
October 62.1° 42.2° 3.34" 0.7"
November 49.6° 33.4° 2.96" 4.5"
December 38.7° 25.5° 3.17" 14.8"

Rainfall by month

Precipitation is spread fairly evenly through the year here, with 29% falling in the wettest three months (May, Jun, Jul).

January 3.03"
February 2.52"
March 3.21"
April 3.75"
May 3.72"
June 3.90"
July 4.27"
August 3.48"
September 3.84"
October 3.34"
November 2.96"
December 3.17"
Annual total 41.19"

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 633
Heating degree days How much heating the climate demands 6,089
Approximate annual cooling cost At 21.55¢/kWh, Pennsylvania average $136
Approximate annual electric heating cost Lower where heating is gas rather than electric $459

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 82.7°F in July and a low of 19.3°F in January. Annual precipitation is 41.19 inches, including 67.8 inches of snow.

When is the rainy season in Mercer County?

The wettest stretch is May, Jun, Jul, which accounts for 29% 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 82.7°F. That drives 633 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 67.8 inches of snow a year.

Sources

  • Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station YOUNGSTOWN RGNL AP, OH US (USW00014852), 22.1 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, Pennsylvania residential average.
  • Wet-season share is the wettest three consecutive months as a percentage of annual precipitation, calculated from the monthly normals.