30-year climate normals

Modoc County Climate and Weather Averages

Hottest month — July

89.1°

average daily high. The coldest month is December, averaging a low of 20.0°F.

Modoc County gets 11.68" of precipitation a year, and 35% 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.

Month	Avg high	Avg low	Precip
January	43.0°	20.6°	1.31"
February	46.6°	23.0°	1.09"
March	52.7°	26.5°	1.38"
April	58.4°	30.1°	1.47"
May	67.9°	37.2°	1.26"
June	78.2°	42.2°	0.70"
July	89.1°	47.2°	0.29"
August	87.3°	44.2°	0.27"
September	79.7°	37.2°	0.35"
October	65.7°	29.3°	0.89"
November	50.8°	24.5°	1.20"
December	41.0°	20.0°	1.47"

Rainfall by month

Precipitation is spread fairly evenly through the year here, with 35% falling in the wettest three months (Mar, Apr, May).

January 1.31"

February 1.09"

March 1.38"

April 1.47"

May 1.26"

June 0.70"

July 0.29"

August 0.27"

September 0.35"

October 0.89"

November 1.20"

December 1.47"

Annual total 11.68"

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 235

Heating degree days How much heating the climate demands 6,558

Approximate annual cooling cost At 33.25¢/kWh, California average $78

Approximate annual electric heating cost Lower where heating is gas rather than electric $763

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 Modoc County, where electricity is one line of eight.

Common questions

What is the weather like in Modoc County?

Modoc County averages a high of 89.1°F in July and a low of 20.0°F in December. Annual precipitation is 11.68 inches, with essentially no snow.

When is the rainy season in Modoc County?

The wettest stretch is Mar, Apr, May, which accounts for 35% of the year's precipitation. Precipitation is relatively evenly distributed across the year.

How hot does it get in Modoc County?

The average daily high in July, the hottest month, is 89.1°F. That drives 235 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Modoc County?

Effectively no. Measurable snowfall is rare in Modoc County.

Sources

Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station ALTURAS MUNI AP, CA US (USW00094299), 10.6 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, California residential average.
Wet-season share is the wettest three consecutive months as a percentage of annual precipitation, calculated from the monthly normals.