30-year climate normals

San Juan County Climate and Weather Averages

Hottest month — July

93.3°

average daily high. The coldest month is January, averaging a low of 19.2°F.

San Juan County gets 7.76" of precipitation a year, and 34% of it falls in Aug, Sep, Oct.

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°	19.2°	0.72"
February	49.5°	23.5°	0.65"
March	59.9°	29.6°	0.60"
April	67.4°	35.3°	0.56"
May	77.2°	43.6°	0.53"
June	89.3°	52.5°	0.20"
July	93.3°	60.9°	0.63"
August	89.7°	59.5°	0.79"
September	82.1°	50.5°	1.06"
October	68.8°	37.8°	0.79"
November	54.6°	27.1°	0.66"
December	43.1°	19.4°	0.57"

Rainfall by month

Precipitation is spread fairly evenly through the year here, with 34% falling in the wettest three months (Aug, Sep, Oct).

January 0.72"

February 0.65"

March 0.60"

April 0.56"

May 0.53"

June 0.20"

July 0.63"

August 0.79"

September 1.06"

October 0.79"

November 0.66"

December 0.57"

Annual total 7.76"

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 995

Heating degree days How much heating the climate demands 5,268

Approximate annual cooling cost At 14.12¢/kWh, New Mexico average $140

Approximate annual electric heating cost Lower where heating is gas rather than electric $260

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 San Juan County, where electricity is one line of eight.

Common questions

What is the weather like in San Juan County?

San Juan County averages a high of 93.3°F in July and a low of 19.2°F in January. Annual precipitation is 7.76 inches, with essentially no snow.

When is the rainy season in San Juan County?

The wettest stretch is Aug, Sep, Oct, which accounts for 34% of the year's precipitation. Precipitation is relatively evenly distributed across the year.

How hot does it get in San Juan County?

The average daily high in July, the hottest month, is 93.3°F. That drives 995 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in San Juan County?

Effectively no. Measurable snowfall is rare in San Juan County.

Sources

Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station FARMINGTON RGNL AP, NM US (USW00023090), 16.9 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, New Mexico residential average.
Wet-season share is the wettest three consecutive months as a percentage of annual precipitation, calculated from the monthly normals.