30-year climate normals

Delta County Climate and Weather Averages

Hottest month — July

76.7°

average daily high. The coldest month is February, averaging a low of 6.2°F.

Delta County gets 31.29" of precipitation a year, and 32% of it falls in Jul, Aug, Sep.

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	24.8°	6.8°	1.60"
February	27.9°	6.2°	1.28"
March	38.0°	15.2°	1.87"
April	50.2°	27.8°	2.57"
May	63.3°	40.5°	3.49"
June	72.6°	50.4°	2.48"
July	76.7°	56.3°	3.64"
August	75.8°	54.9°	2.89"
September	68.3°	47.8°	3.43"
October	55.0°	35.9°	3.48"
November	41.3°	26.6°	2.79"
December	30.3°	15.9°	1.77"

Rainfall by month

Precipitation is spread fairly evenly through the year here, with 32% falling in the wettest three months (Jul, Aug, Sep).

January 1.60"

February 1.28"

March 1.87"

April 2.57"

May 3.49"

June 2.48"

July 3.64"

August 2.89"

September 3.43"

October 3.48"

November 2.79"

December 1.77"

Annual total 31.29"

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 218

Heating degree days How much heating the climate demands 8,555

Approximate annual cooling cost At 22.01¢/kWh, Michigan average $48

Approximate annual electric heating cost Lower where heating is gas rather than electric $659

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 Delta County, where electricity is one line of eight.

Common questions

What is the weather like in Delta County?

Delta County averages a high of 76.7°F in July and a low of 6.2°F in February. Annual precipitation is 31.29 inches, with essentially no snow.

When is the rainy season in Delta County?

The wettest stretch is Jul, Aug, Sep, which accounts for 32% of the year's precipitation. Precipitation is relatively evenly distributed across the year.

How hot does it get in Delta County?

The average daily high in July, the hottest month, is 76.7°F. That drives 218 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Delta County?

Effectively no. Measurable snowfall is rare in Delta County.

Sources

Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station RAPID RVR 4SSE, MI US (USC00206840), 5.2 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, Michigan residential average.
Wet-season share is the wettest three consecutive months as a percentage of annual precipitation, calculated from the monthly normals.