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United States › Michigan › Ottawa County › Climate Station GRAND HAVEN WWTP, MI US Distance 0.8 mi Normals 1991–2020

30-year climate normals

Ottawa County Climate and Weather Averages

Hottest month — July

80.0°

average daily high. The coldest month is January, averaging a low of 19.3°F.

Ottawa County gets 37.64" of precipitation a year, and 29% of it falls in Apr, May, Jun.

Temperature through the year

Each bar spans the average daily low to the average daily high for that month.

20° 40° 60° 80° JanFebMarAprMayJunJulAugSepOctNovDec
MonthAvg highAvg low Precip
January 31.7° 19.3° 2.84"
February 33.2° 19.5° 2.00"
March 42.4° 25.5° 2.27"
April 54.7° 35.8° 3.71"
May 67.1° 46.9° 3.81"
June 76.4° 56.9° 3.54"
July 80.0° 61.9° 3.62"
August 78.9° 59.8° 3.13"
September 72.9° 52.5° 3.45"
October 60.0° 42.5° 3.75"
November 46.7° 32.8° 3.08"
December 36.5° 25.2° 2.44"

Rainfall by month

Precipitation is spread fairly evenly through the year here, with 29% falling in the wettest three months (Apr, May, Jun).

January 2.84"
February 2.00"
March 2.27"
April 3.71"
May 3.81"
June 3.54"
July 3.62"
August 3.13"
September 3.45"
October 3.75"
November 3.08"
December 2.44"
Annual total 37.64"

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 534
Heating degree days How much heating the climate demands 6,586
Approximate annual cooling cost At 22.01¢/kWh, Michigan average $118
Approximate annual electric heating cost Lower where heating is gas rather than electric $507

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 Ottawa County, where electricity is one line of eight.

Common questions

What is the weather like in Ottawa County?

Ottawa County averages a high of 80.0°F in July and a low of 19.3°F in January. Annual precipitation is 37.64 inches, with essentially no snow.

When is the rainy season in Ottawa County?

The wettest stretch is Apr, May, Jun, which accounts for 29% of the year's precipitation. Precipitation is relatively evenly distributed across the year.

How hot does it get in Ottawa County?

The average daily high in July, the hottest month, is 80.0°F. That drives 534 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Ottawa County?

Effectively no. Measurable snowfall is rare in Ottawa County.

Sources

  • Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station GRAND HAVEN WWTP, MI US (USC00203295), 0.8 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.