30-year climate normals

Hamilton County Climate and Weather Averages

Hottest month — July

84.4°

average daily high. The coldest month is January, averaging a low of 18.8°F.

Hamilton County gets 44.4" of precipitation a year, and 33% 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	34.5°	18.8°	2.75"
February	38.8°	21.4°	2.16"
March	49.2°	29.9°	3.39"
April	61.8°	40.5°	4.25"
May	72.1°	51.0°	4.97"
June	81.1°	60.8°	5.45"
July	84.4°	64.1°	4.27"
August	83.0°	62.2°	4.19"
September	77.1°	54.5°	3.46"
October	64.7°	42.7°	3.30"
November	50.8°	32.5°	3.44"
December	39.2°	24.0°	2.77"

Rainfall by month

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

January 2.75"

February 2.16"

March 3.39"

April 4.25"

May 4.97"

June 5.45"

July 4.27"

August 4.19"

September 3.46"

October 3.30"

November 3.44"

December 2.77"

Annual total 44.4"

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 920

Heating degree days How much heating the climate demands 5,758

Approximate annual cooling cost At 18.15¢/kWh, Indiana average $167

Approximate annual electric heating cost Lower where heating is gas rather than electric $366

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 Hamilton County, where electricity is one line of eight.

Common questions

What is the weather like in Hamilton County?

Hamilton County averages a high of 84.4°F in July and a low of 18.8°F in January. Annual precipitation is 44.4 inches, with essentially no snow.

When is the rainy season in Hamilton County?

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

How hot does it get in Hamilton County?

The average daily high in July, the hottest month, is 84.4°F. That drives 920 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Hamilton County?

Effectively no. Measurable snowfall is rare in Hamilton County.

Sources

Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station CARMEL 3 E, IN US (USC00121303), 6.6 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.