30-year climate normals

Winnebago County Climate and Weather Averages

Hottest month — July

81.3°

average daily high. The coldest month is January, averaging a low of 11.1°F.

Winnebago County gets 30.56" of precipitation a year, and 39% 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.

Month	Avg high	Avg low	Precip
January	26.0°	11.1°	1.11"
February	29.7°	13.5°	0.83"
March	41.5°	24.2°	1.74"
April	54.8°	35.5°	2.89"
May	67.4°	46.9°	3.60"
June	77.3°	57.2°	4.65"
July	81.3°	61.2°	3.69"
August	79.2°	59.7°	3.20"
September	72.0°	51.3°	3.00"
October	58.5°	40.1°	2.76"
November	44.1°	28.5°	1.82"
December	31.7°	17.9°	1.27"

Rainfall by month

Precipitation is spread fairly evenly through the year here, with 39% falling in the wettest three months (May, Jun, Jul).

January 1.11"

February 0.83"

March 1.74"

April 2.89"

May 3.60"

June 4.65"

July 3.69"

August 3.20"

September 3.00"

October 2.76"

November 1.82"

December 1.27"

Annual total 30.56"

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 566

Heating degree days How much heating the climate demands 7,352

Approximate annual cooling cost At 19.74¢/kWh, Wisconsin average $112

Approximate annual electric heating cost Lower where heating is gas rather than electric $508

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 Winnebago County, where electricity is one line of eight.

Common questions

What is the weather like in Winnebago County?

Winnebago County averages a high of 81.3°F in July and a low of 11.1°F in January. Annual precipitation is 30.56 inches, with essentially no snow.

When is the rainy season in Winnebago County?

The wettest stretch is May, Jun, Jul, which accounts for 39% of the year's precipitation. Precipitation is relatively evenly distributed across the year.

How hot does it get in Winnebago County?

The average daily high in July, the hottest month, is 81.3°F. That drives 566 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Winnebago County?

Effectively no. Measurable snowfall is rare in Winnebago County.

Sources

Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station OSHKOSH WITTMAN AP, WI US (USW00094855), 8.9 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.