30-year climate normals

Lake County Climate and Weather Averages

Hottest month — July

85.0°

average daily high. The coldest month is January, averaging a low of 18.4°F.

Lake County gets 33.35" of precipitation a year, and 34% of it falls in Jun, Jul, Aug.

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	33.9°	18.4°	1.61"
February	37.9°	21.8°	1.51"
March	49.1°	30.5°	1.92"
April	62.1°	39.7°	3.26"
May	73.0°	50.5°	3.71"
June	82.2°	60.5°	3.86"
July	85.0°	64.2°	3.60"
August	83.3°	62.3°	3.89"
September	77.6°	54.8°	2.51"
October	65.1°	44.2°	3.32"
November	50.5°	34.2°	2.44"
December	38.8°	24.5°	1.72"

Rainfall by month

Precipitation is spread fairly evenly through the year here, with 34% falling in the wettest three months (Jun, Jul, Aug).

January 1.61"

February 1.51"

March 1.92"

April 3.26"

May 3.71"

June 3.86"

July 3.60"

August 3.89"

September 2.51"

October 3.32"

November 2.44"

December 1.72"

Annual total 33.35"

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 975

Heating degree days How much heating the climate demands 5,737

Approximate annual cooling cost At 18.15¢/kWh, Indiana average $177

Approximate annual electric heating cost Lower where heating is gas rather than electric $364

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 Lake County, where electricity is one line of eight.

Common questions

What is the weather like in Lake County?

Lake County averages a high of 85.0°F in July and a low of 18.4°F in January. Annual precipitation is 33.35 inches, with essentially no snow.

When is the rainy season in Lake County?

The wettest stretch is Jun, Jul, Aug, which accounts for 34% of the year's precipitation. Precipitation is relatively evenly distributed across the year.

How hot does it get in Lake County?

The average daily high in July, the hottest month, is 85.0°F. That drives 975 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Lake County?

Effectively no. Measurable snowfall is rare in Lake County.

Sources

Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station VALPARAISO PORTER CO MUNI AP, IN US (USW00004846), 19.1 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, Indiana residential average.
Wet-season share is the wettest three consecutive months as a percentage of annual precipitation, calculated from the monthly normals.