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United States › Idaho › Nez Perce County › Climate Station LEWISTON NEZ PERCE CO AP, ID US Distance 12.5 mi Normals 1991–2020

30-year climate normals

Nez Perce County Climate and Weather Averages

Hottest month — July

90.8°

average daily high. The coldest month is December, averaging a low of 29.5°F.

Nez Perce County gets 12.87" of precipitation a year and 12.7" of snow, and 34% of it falls in Mar, Apr, May.

Temperature through the year

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

40° 60° 80° JanFebMarAprMayJunJulAugSepOctNovDec
MonthAvg highAvg low PrecipSnow
January 42.1° 30.3° 1.13" 2.7"
February 47.0° 31.7° 1.04" 3.8"
March 55.1° 35.7° 1.30" 0.8"
April 62.3° 40.7° 1.44" 0.0"
May 72.0° 48.1° 1.69" 0.0"
June 79.0° 54.0° 1.25" 0.0"
July 90.8° 60.9° 0.47" 0.0"
August 90.1° 60.3° 0.51" 0.0"
September 79.5° 52.3° 0.60" 0.0"
October 63.0° 42.0° 1.08" 0.0"
November 48.7° 34.5° 1.23" 1.3"
December 40.8° 29.5° 1.13" 4.1"

Rainfall by month

Precipitation is spread fairly evenly through the year here, with 34% falling in the wettest three months (Mar, Apr, May).

January 1.13"
February 1.04"
March 1.30"
April 1.44"
May 1.69"
June 1.25"
July 0.47"
August 0.51"
September 0.60"
October 1.08"
November 1.23"
December 1.13"
Annual total 12.87"

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 913
Heating degree days How much heating the climate demands 4,980
Approximate annual cooling cost At 12.35¢/kWh, Idaho average $113
Approximate annual electric heating cost Lower where heating is gas rather than electric $215

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 Nez Perce County, where electricity is one line of eight.

Common questions

What is the weather like in Nez Perce County?

Nez Perce County averages a high of 90.8°F in July and a low of 29.5°F in December. Annual precipitation is 12.87 inches, including 12.7 inches of snow.

When is the rainy season in Nez Perce County?

The wettest stretch is Mar, Apr, May, which accounts for 34% of the year's precipitation. Precipitation is relatively evenly distributed across the year.

How hot does it get in Nez Perce County?

The average daily high in July, the hottest month, is 90.8°F. That drives 913 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Nez Perce County?

Yes. Nez Perce County averages 12.7 inches of snow a year.

Sources

  • Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station LEWISTON NEZ PERCE CO AP, ID US (USW00024149), 12.5 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.