30-year climate normals

Valley County Climate and Weather Averages

Hottest month — July

86.6°

average daily high. The coldest month is January, averaging a low of 12.2°F.

Valley County gets 24.04" of precipitation a year, and 35% of it falls in Nov, Dec, Jan.

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	36.1°	12.2°	2.69"
February	40.4°	16.1°	1.97"
March	46.3°	23.0°	2.67"
April	55.7°	29.0°	2.10"
May	64.1°	35.2°	1.79"
June	73.9°	41.5°	2.13"
July	86.6°	45.1°	0.91"
August	86.5°	44.6°	0.71"
September	76.4°	37.3°	1.33"
October	59.4°	30.0°	2.05"
November	43.0°	22.1°	2.72"
December	33.6°	14.7°	2.97"

Rainfall by month

Precipitation is spread fairly evenly through the year here, with 35% falling in the wettest three months (Nov, Dec, Jan).

January 2.69"

February 1.97"

March 2.67"

April 2.10"

May 1.79"

June 2.13"

July 0.91"

August 0.71"

September 1.33"

October 2.05"

November 2.72"

December 2.97"

Annual total 24.04"

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 198

Heating degree days How much heating the climate demands 7,878

Approximate annual cooling cost At 12.35¢/kWh, Idaho average $24

Approximate annual electric heating cost Lower where heating is gas rather than electric $341

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 Valley County, where electricity is one line of eight.

Common questions

What is the weather like in Valley County?

Valley County averages a high of 86.6°F in July and a low of 12.2°F in January. Annual precipitation is 24.04 inches, with essentially no snow.

When is the rainy season in Valley County?

The wettest stretch is Nov, Dec, Jan, which accounts for 35% of the year's precipitation. Precipitation is relatively evenly distributed across the year.

How hot does it get in Valley County?

The average daily high in July, the hottest month, is 86.6°F. That drives 198 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Valley County?

Effectively no. Measurable snowfall is rare in Valley County.

Sources

Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station YELLOWPINE, ID US (USC00109950), 9.5 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.