30-year climate normals

Power County Climate and Weather Averages

Hottest month — July

90.4°

average daily high. The coldest month is January, averaging a low of 18.7°F.

Power County gets 11.1" of precipitation a year, and 36% 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.

Month	Avg high	Avg low	Precip
January	34.5°	18.7°	0.96"
February	39.1°	21.0°	0.68"
March	51.8°	29.1°	1.02"
April	60.0°	35.0°	1.30"
May	71.3°	42.5°	1.54"
June	79.1°	49.6°	1.15"
July	90.4°	56.4°	0.53"
August	87.7°	54.8°	0.49"
September	76.9°	46.2°	0.81"
October	61.4°	36.2°	0.92"
November	46.5°	26.8°	0.83"
December	34.5°	20.0°	0.87"

Rainfall by month

Precipitation is spread fairly evenly through the year here, with 36% falling in the wettest three months (Apr, May, Jun).

January 0.96"

February 0.68"

March 1.02"

April 1.30"

May 1.54"

June 1.15"

July 0.53"

August 0.49"

September 0.81"

October 0.92"

November 0.83"

December 0.87"

Annual total 11.1"

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 608

Heating degree days How much heating the climate demands 6,507

Approximate annual cooling cost At 12.35¢/kWh, Idaho average $75

Approximate annual electric heating cost Lower where heating is gas rather than electric $281

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 Power County, where electricity is one line of eight.

Common questions

What is the weather like in Power County?

Power County averages a high of 90.4°F in July and a low of 18.7°F in January. Annual precipitation is 11.1 inches, with essentially no snow.

When is the rainy season in Power County?

The wettest stretch is Apr, May, Jun, which accounts for 36% of the year's precipitation. Precipitation is relatively evenly distributed across the year.

How hot does it get in Power County?

The average daily high in July, the hottest month, is 90.4°F. That drives 608 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Power County?

Effectively no. Measurable snowfall is rare in Power County.

Sources

Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station AMERICAN FALLS, ID US (USC00100218), 7.5 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, Idaho residential average.
Wet-season share is the wettest three consecutive months as a percentage of annual precipitation, calculated from the monthly normals.