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United States › Kentucky › Jefferson County › Climate Station LOUISVILLE BOWMAN FLD, KY US Distance 2.7 mi Normals 1991–2020

30-year climate normals

Jefferson County Climate and Weather Averages

Hottest month — July

87.9°

average daily high. The coldest month is January, averaging a low of 27.1°F.

Jefferson County gets 48.12" of precipitation a year, and 30% 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 42.9° 27.1° 3.28"
February 47.5° 29.8° 3.27"
March 57.0° 37.8° 4.37"
April 68.6° 47.5° 4.69"
May 77.1° 57.4° 5.16"
June 84.8° 65.9° 4.68"
July 87.9° 69.3° 4.56"
August 87.1° 68.1° 3.53"
September 80.9° 59.9° 3.61"
October 69.3° 48.2° 3.65"
November 56.6° 37.8° 3.44"
December 46.4° 31.2° 3.88"

Rainfall by month

Precipitation is spread fairly evenly through the year here, with 30% falling in the wettest three months (Apr, May, Jun).

January 3.28"
February 3.27"
March 4.37"
April 4.69"
May 5.16"
June 4.68"
July 4.56"
August 3.53"
September 3.61"
October 3.65"
November 3.44"
December 3.88"
Annual total 48.12"

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 1,543
Heating degree days How much heating the climate demands 4,150
Approximate annual cooling cost At 14.98¢/kWh, Kentucky average $231
Approximate annual electric heating cost Lower where heating is gas rather than electric $218

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 87.9°F in July and a low of 27.1°F in January. Annual precipitation is 48.12 inches, with essentially no snow.

When is the rainy season in Jefferson County?

The wettest stretch is Apr, May, Jun, which accounts for 30% 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 87.9°F. That drives 1,543 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 LOUISVILLE BOWMAN FLD, KY US (USW00013810), 2.7 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, Kentucky residential average.
  • Wet-season share is the wettest three consecutive months as a percentage of annual precipitation, calculated from the monthly normals.