30-year climate normals

Payette County Climate and Weather Averages

Hottest month — July

95.1°

average daily high. The coldest month is January, averaging a low of 24.3°F.

Payette County gets 9.48" of precipitation a year, and 39% of it falls in Dec, Jan, Feb.

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°	24.3°	1.38"
February	46.9°	28.0°	0.89"
March	58.4°	33.9°	0.97"
April	66.0°	39.4°	0.77"
May	76.4°	47.9°	1.17"
June	84.7°	54.9°	0.72"
July	95.1°	61.5°	0.26"
August	93.4°	58.9°	0.12"
September	82.7°	49.2°	0.29"
October	66.9°	38.7°	0.64"
November	49.8°	29.5°	0.88"
December	38.9°	24.4°	1.39"

Rainfall by month

Precipitation is spread fairly evenly through the year here, with 39% falling in the wettest three months (Dec, Jan, Feb).

January 1.38"

February 0.89"

March 0.97"

April 0.77"

May 1.17"

June 0.72"

July 0.26"

August 0.12"

September 0.29"

October 0.64"

November 0.88"

December 1.39"

Annual total 9.48"

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 1,100

Heating degree days How much heating the climate demands 5,200

Approximate annual cooling cost At 12.35¢/kWh, Idaho average $136

Approximate annual electric heating cost Lower where heating is gas rather than electric $225

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 Payette County, where electricity is one line of eight.

Common questions

What is the weather like in Payette County?

Payette County averages a high of 95.1°F in July and a low of 24.3°F in January. Annual precipitation is 9.48 inches, with essentially no snow.

When is the rainy season in Payette County?

The wettest stretch is Dec, Jan, Feb, which accounts for 39% of the year's precipitation. Precipitation is relatively evenly distributed across the year.

How hot does it get in Payette County?

The average daily high in July, the hottest month, is 95.1°F. That drives 1,100 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Payette County?

Effectively no. Measurable snowfall is rare in Payette County.

Sources

Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station ONTARIO MUNI AP, OR US (USW00024162), 13.1 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.