30-year climate normals

Defiance County Climate and Weather Averages

Hottest month — July

83.7°

average daily high. The coldest month is January, averaging a low of 18.1°F.

Defiance County gets 32.95" 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	32.3°	18.1°	1.94"
February	35.5°	20.1°	1.65"
March	46.5°	28.4°	2.26"
April	59.9°	38.5°	3.48"
May	70.9°	49.1°	3.89"
June	80.1°	58.8°	3.38"
July	83.7°	62.2°	3.63"
August	81.5°	60.2°	3.37"
September	75.3°	52.5°	2.67"
October	62.7°	41.9°	2.32"
November	48.7°	32.5°	2.48"
December	36.9°	23.7°	1.88"

Rainfall by month

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

January 1.94"

February 1.65"

March 2.26"

April 3.48"

May 3.89"

June 3.38"

July 3.63"

August 3.37"

September 2.67"

October 2.32"

November 2.48"

December 1.88"

Annual total 32.95"

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 747

Heating degree days How much heating the climate demands 6,179

Approximate annual cooling cost At 19.52¢/kWh, Ohio average $146

Approximate annual electric heating cost Lower where heating is gas rather than electric $422

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 Defiance County, where electricity is one line of eight.

Common questions

What is the weather like in Defiance County?

Defiance County averages a high of 83.7°F in July and a low of 18.1°F in January. Annual precipitation is 32.95 inches, with essentially no snow.

When is the rainy season in Defiance 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 Defiance County?

The average daily high in July, the hottest month, is 83.7°F. That drives 747 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Defiance County?

Effectively no. Measurable snowfall is rare in Defiance County.

Sources

Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station DEFIANCE MEM AP, OH US (USW00004851), 3.2 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, Ohio residential average.
Wet-season share is the wettest three consecutive months as a percentage of annual precipitation, calculated from the monthly normals.