30-year climate normals

Gem County Climate and Weather Averages

Hottest month — July

92.5°

average daily high. The coldest month is January, averaging a low of 15.4°F.

Gem County gets 22.53" of precipitation a year, and 43% 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	37.7°	15.4°	3.44"
February	44.6°	19.2°	2.26"
March	54.4°	26.4°	2.34"
April	61.8°	31.0°	2.00"
May	72.1°	38.8°	2.18"
June	80.7°	44.4°	1.24"
July	92.5°	50.6°	0.41"
August	91.2°	48.4°	0.34"
September	80.9°	39.6°	0.54"
October	65.1°	29.5°	1.63"
November	48.3°	21.9°	2.26"
December	37.7°	16.6°	3.89"

Rainfall by month

Precipitation is spread fairly evenly through the year here, with 43% falling in the wettest three months (Nov, Dec, Jan).

January 3.44"

February 2.26"

March 2.34"

April 2.00"

May 2.18"

June 1.24"

July 0.41"

August 0.34"

September 0.54"

October 1.63"

November 2.26"

December 3.89"

Annual total 22.53"

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 493

Heating degree days How much heating the climate demands 6,711

Approximate annual cooling cost At 12.35¢/kWh, Idaho average $61

Approximate annual electric heating cost Lower where heating is gas rather than electric $290

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 Gem County, where electricity is one line of eight.

Common questions

What is the weather like in Gem County?

Gem County averages a high of 92.5°F in July and a low of 15.4°F in January. Annual precipitation is 22.53 inches, with essentially no snow.

When is the rainy season in Gem County?

The wettest stretch is Nov, Dec, Jan, which accounts for 43% of the year's precipitation. Precipitation is relatively evenly distributed across the year.

How hot does it get in Gem County?

The average daily high in July, the hottest month, is 92.5°F. That drives 493 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Gem County?

Effectively no. Measurable snowfall is rare in Gem County.

Sources

Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station OLA, ID US (USC00106586), 9.8 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.