30-year climate normals

Madison County Climate and Weather Averages

Hottest month — July

84.8°

average daily high. The coldest month is January, averaging a low of 12.9°F.

Madison County gets 11.97" of precipitation a year, and 39% 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	27.8°	12.9°	1.05"
February	32.2°	16.0°	0.69"
March	45.1°	25.0°	0.89"
April	55.5°	32.2°	1.52"
May	65.9°	39.8°	1.71"
June	74.2°	46.3°	1.43"
July	84.8°	51.6°	0.38"
August	84.2°	49.7°	0.75"
September	73.1°	41.6°	0.78"
October	57.3°	32.2°	1.03"
November	41.3°	22.9°	0.75"
December	29.3°	14.3°	0.99"

Rainfall by month

Precipitation is spread fairly evenly through the year here, with 39% falling in the wettest three months (Apr, May, Jun).

January 1.05"

February 0.69"

March 0.89"

April 1.52"

May 1.71"

June 1.43"

July 0.38"

August 0.75"

September 0.78"

October 1.03"

November 0.75"

December 0.99"

Annual total 11.97"

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 258

Heating degree days How much heating the climate demands 7,893

Approximate annual cooling cost At 12.35¢/kWh, Idaho average $32

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 Madison County, where electricity is one line of eight.

Common questions

What is the weather like in Madison County?

Madison County averages a high of 84.8°F in July and a low of 12.9°F in January. Annual precipitation is 11.97 inches, with essentially no snow.

When is the rainy season in Madison County?

The wettest stretch is Apr, May, Jun, which accounts for 39% of the year's precipitation. Precipitation is relatively evenly distributed across the year.

How hot does it get in Madison County?

The average daily high in July, the hottest month, is 84.8°F. That drives 258 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Madison County?

Effectively no. Measurable snowfall is rare in Madison County.

Sources

Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station REXBURG MADISON CO AP, ID US (USW00094194), 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.