This weather has a price Keeping the median Lyman County home comfortable runs roughly $521 a year in heating and cooling alone. See where it lands in the monthly bill

30-year climate normals

Lyman County Climate and Weather Averages

Hottest month: July

89.7°

average daily high. The coldest month is January, averaging a low of 9.2°F.

Lyman County gets 20.79" of precipitation a year and 39.6" of snow, and 46% 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	Snow
January	31.6°	9.2°	0.45"	5.5"
February	36.4°	12.7°	0.59"	7.6"
March	49.0°	22.7°	0.96"	5.5"
April	61.6°	32.9°	2.34"	6.2"
May	72.4°	44.9°	3.29"	0.0"
June	82.4°	55.6°	3.48"	0.0"
July	89.7°	61.4°	2.84"	0.0"
August	87.8°	59.2°	2.31"	0.0"
September	80.3°	49.5°	1.72"	0.0"
October	63.8°	35.6°	1.63"	1.6"
November	47.1°	22.3°	0.71"	6.0"
December	34.3°	12.5°	0.47"	7.2"

Rainfall by month

Lyman County has a distinct wet season. 46% of the year's precipitation arrives in May, Jun, Jul.

January 0.45"

February 0.59"

March 0.96"

April 2.34"

May 3.29"

June 3.48"

July 2.84"

August 2.31"

September 1.72"

October 1.63"

November 0.71"

December 0.47"

Annual total 20.79"

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 929

Heating degree days How much heating the climate demands 7,042

Approximate annual cooling cost At 15.36¢/kWh, South Dakota average $143

Approximate annual electric heating cost Lower where heating is gas rather than electric $379

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 Lyman County, where electricity is one line of eight.

Common questions

What is the weather like in Lyman County?

Lyman County averages a high of 89.7°F in July and a low of 9.2°F in January. Annual precipitation is 20.79 inches, including 39.6 inches of snow.

When is the rainy season in Lyman County?

The wettest stretch is May, Jun, Jul, which accounts for 46% of the year's precipitation. That is a pronounced wet season rather than rain spread evenly through the year.

How hot does it get in Lyman County?

The average daily high in July, the hottest month, is 89.7°F. That drives 929 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Lyman County?

Yes. Lyman County averages 39.6 inches of snow a year.

Sources

Temperature, precipitation and snowfall normals: NOAA National Centers for Environmental Information, 1991 to 2020 Monthly Climate Normals, station KENNEBEC, SD US (USC00394516), 1 miles from the county centroid.
Heating and cooling degree days: NOAA, same station and period.
Annual figures on this page are the sum of that station's twelve monthly normals. NOAA also publishes a separately-computed annual normal, which can differ from the monthly sum by a few percent; we use the monthly series because the month-by-month breakdown above has to come from it.
Electricity price: US Energy Information Administration, Electric Power Monthly Table 5.6.A, South Dakota residential average.
Wet-season share is the wettest three consecutive months as a percentage of annual precipitation, calculated from the monthly normals.