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United States › Indiana › Sullivan County › Climate Station SHAKAMAK SP, IN US Distance 10.5 mi Normals 1991–2020

30-year climate normals

Sullivan County Climate and Weather Averages

Hottest month — July

85.6°

average daily high. The coldest month is January, averaging a low of 20.6°F.

Sullivan County gets 47.17" of precipitation a year, and 33% of it falls in Apr, May, Jun.

Temperature through the year

Each bar spans the average daily low to the average daily high for that month.

40° 60° 80° JanFebMarAprMayJunJulAugSepOctNovDec
MonthAvg highAvg low Precip
January 38.3° 20.6° 3.34"
February 42.9° 23.7° 2.76"
March 53.4° 32.9° 3.48"
April 65.8° 44.1° 5.07"
May 74.8° 54.1° 5.23"
June 82.9° 62.8° 5.06"
July 85.6° 66.3° 4.67"
August 84.8° 64.7° 3.24"
September 79.4° 57.1° 3.59"
October 67.8° 45.3° 3.79"
November 53.9° 34.2° 3.91"
December 42.7° 26.1° 3.03"

Rainfall by month

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

January 3.34"
February 2.76"
March 3.48"
April 5.07"
May 5.23"
June 5.06"
July 4.67"
August 3.24"
September 3.59"
October 3.79"
November 3.91"
December 3.03"
Annual total 47.17"

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 1,193
Heating degree days How much heating the climate demands 5,043
Approximate annual cooling cost At 18.15¢/kWh, Indiana average $217
Approximate annual electric heating cost Lower where heating is gas rather than electric $320

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 Sullivan County, where electricity is one line of eight.

Common questions

What is the weather like in Sullivan County?

Sullivan County averages a high of 85.6°F in July and a low of 20.6°F in January. Annual precipitation is 47.17 inches, with essentially no snow.

When is the rainy season in Sullivan County?

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

How hot does it get in Sullivan County?

The average daily high in July, the hottest month, is 85.6°F. That drives 1,193 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Sullivan County?

Effectively no. Measurable snowfall is rare in Sullivan County.

Sources

  • Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station SHAKAMAK SP, IN US (USC00127959), 10.5 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, Indiana residential average.
  • Wet-season share is the wettest three consecutive months as a percentage of annual precipitation, calculated from the monthly normals.