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United States › Wisconsin › Milwaukee County › Climate Station SOUTH MILWAUKEE WWTP, WI US Distance 1 mi Normals 1991–2020

30-year climate normals

Milwaukee County Climate and Weather Averages

Hottest month — July

80.2°

average daily high. The coldest month is January, averaging a low of 15.9°F.

Milwaukee County gets 36.58" of precipitation a year, and 35% 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.

20° 40° 60° 80° JanFebMarAprMayJunJulAugSepOctNovDec
MonthAvg highAvg low Precip
January 30.4° 15.9° 1.65"
February 33.2° 18.1° 1.84"
March 42.4° 27.5° 2.20"
April 52.8° 37.3° 4.08"
May 64.1° 47.3° 4.18"
June 74.5° 57.3° 4.58"
July 80.2° 64.9° 3.51"
August 79.3° 64.2° 3.80"
September 73.0° 56.0° 3.30"
October 60.7° 43.9° 3.40"
November 47.8° 32.6° 2.14"
December 35.8° 22.1° 1.90"

Rainfall by month

Precipitation is spread fairly evenly through the year here, with 35% falling in the wettest three months (Apr, May, Jun).

January 1.65"
February 1.84"
March 2.20"
April 4.08"
May 4.18"
June 4.58"
July 3.51"
August 3.80"
September 3.30"
October 3.40"
November 2.14"
December 1.90"
Annual total 36.58"

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 662
Heating degree days How much heating the climate demands 6,679
Approximate annual cooling cost At 19.74¢/kWh, Wisconsin average $131
Approximate annual electric heating cost Lower where heating is gas rather than electric $461

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 Milwaukee County, where electricity is one line of eight.

Common questions

What is the weather like in Milwaukee County?

Milwaukee County averages a high of 80.2°F in July and a low of 15.9°F in January. Annual precipitation is 36.58 inches, with essentially no snow.

When is the rainy season in Milwaukee County?

The wettest stretch is Apr, May, Jun, which accounts for 35% of the year's precipitation. Precipitation is relatively evenly distributed across the year.

How hot does it get in Milwaukee County?

The average daily high in July, the hottest month, is 80.2°F. That drives 662 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Milwaukee County?

Effectively no. Measurable snowfall is rare in Milwaukee County.

Sources

  • Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station SOUTH MILWAUKEE WWTP, WI US (USC00477964), 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, Wisconsin residential average.
  • Wet-season share is the wettest three consecutive months as a percentage of annual precipitation, calculated from the monthly normals.