30-year climate normals

Oglala Lakota County Climate and Weather Averages

Hottest month — July

91.0°

average daily high. The coldest month is January, averaging a low of 12.7°F.

Oglala Lakota County gets 15.22" of precipitation a year, and 47% 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	38.3°	12.7°	0.15"
February	40.8°	15.0°	0.29"
March	52.0°	23.8°	0.81"
April	59.8°	31.8°	1.96"
May	69.8°	41.9°	2.71"
June	81.8°	52.2°	2.46"
July	91.0°	59.5°	1.99"
August	88.9°	56.6°	1.27"
September	79.2°	46.5°	1.59"
October	63.4°	32.8°	1.28"
November	49.6°	21.2°	0.40"
December	38.6°	12.8°	0.31"

Rainfall by month

Oglala Lakota County has a distinct wet season. 47% of the year's precipitation arrives in May, Jun, Jul.

January 0.15"

February 0.29"

March 0.81"

April 1.96"

May 2.71"

June 2.46"

July 1.99"

August 1.27"

September 1.59"

October 1.28"

November 0.40"

December 0.31"

Annual total 15.22"

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 808

Heating degree days How much heating the climate demands 6,848

Approximate annual cooling cost At 15.73¢/kWh, South Dakota average $127

Approximate annual electric heating cost Lower where heating is gas rather than electric $377

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 Oglala Lakota County, where electricity is one line of eight.

Common questions

What is the weather like in Oglala Lakota County?

Oglala Lakota County averages a high of 91.0°F in July and a low of 12.7°F in January. Annual precipitation is 15.22 inches, with essentially no snow.

When is the rainy season in Oglala Lakota County?

The wettest stretch is May, Jun, Jul, which accounts for 47% 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 Oglala Lakota County?

The average daily high in July, the hottest month, is 91.0°F. That drives 808 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Oglala Lakota County?

Effectively no. Measurable snowfall is rare in Oglala Lakota County.

Sources

Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station CHADRON MUNI AP, NE US (USW00024017), 43.6 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, South Dakota residential average.
Wet-season share is the wettest three consecutive months as a percentage of annual precipitation, calculated from the monthly normals.