30-year climate normals

Navajo County Climate and Weather Averages

Hottest month — July

94.6°

average daily high. The coldest month is December, averaging a low of 21.7°F.

Navajo County gets 6.52" of precipitation a year, and 45% of it falls in Jul, Aug, Sep.

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	49.8°	22.0°	0.51"
February	56.2°	25.9°	0.42"
March	64.5°	31.8°	0.49"
April	71.9°	37.9°	0.25"
May	81.2°	46.2°	0.30"
June	92.3°	55.2°	0.14"
July	94.6°	63.7°	0.89"
August	91.7°	62.5°	1.16"
September	85.6°	53.8°	0.87"
October	73.8°	40.4°	0.51"
November	60.3°	28.9°	0.48"
December	48.7°	21.7°	0.50"

Rainfall by month

Navajo County has a distinct wet season. 45% of the year's precipitation arrives in Jul, Aug, Sep.

January 0.51"

February 0.42"

March 0.49"

April 0.25"

May 0.30"

June 0.14"

July 0.89"

August 1.16"

September 0.87"

October 0.51"

November 0.48"

December 0.50"

Annual total 6.52"

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 1,328

Heating degree days How much heating the climate demands 4,330

Approximate annual cooling cost At 15.23¢/kWh, Arizona average $202

Approximate annual electric heating cost Lower where heating is gas rather than electric $231

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 Navajo County, where electricity is one line of eight.

Common questions

What is the weather like in Navajo County?

Navajo County averages a high of 94.6°F in July and a low of 21.7°F in December. Annual precipitation is 6.52 inches, with essentially no snow.

When is the rainy season in Navajo County?

The wettest stretch is Jul, Aug, Sep, which accounts for 45% of the year's precipitation. That is a pronounced wet season rather than rain spread evenly through the year.

How hot does it get in Navajo County?

The average daily high in July, the hottest month, is 94.6°F. That drives 1,328 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Navajo County?

Effectively no. Measurable snowfall is rare in Navajo County.

Sources

Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station WINSLOW MUNI AP, AZ US (USW00023194), 33.7 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, Arizona residential average.
Wet-season share is the wettest three consecutive months as a percentage of annual precipitation, calculated from the monthly normals.