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United States › Arizona › Pima County › Climate Station KITT PEAK, AZ US Distance 15.9 mi Normals 1991–2020

30-year climate normals

Pima County Climate and Weather Averages

Hottest month — July

80.3°

average daily high. The coldest month is January, averaging a low of 33.6°F.

Pima County gets 19.91" of precipitation a year and 8" of snow, and 54% 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.

40° 60° 80° JanFebMarAprMayJunJulAugSepOctNovDec
MonthAvg highAvg low PrecipSnow
January 50.6° 33.6° 1.67" 0.9"
February 51.2° 34.1° 1.53" 2.3"
March 56.4° 36.8° 1.47" 2.2"
April 62.9° 41.5° 0.25" 0.9"
May 70.8° 48.8° 0.29" 0.0"
June 80.1° 58.9° 0.40" 0.0"
July 80.3° 60.6° 4.01" 0.0"
August 78.5° 59.9° 4.39" 0.0"
September 75.2° 57.4° 2.43" 0.0"
October 67.7° 48.6° 0.90" 0.4"
November 58.4° 40.1° 0.69" 0.3"
December 50.4° 33.6° 1.88" 1.0"

Rainfall by month

Pima County has a distinct wet season. 54% of the year's precipitation arrives in Jul, Aug, Sep.

January 1.67"
February 1.53"
March 1.47"
April 0.25"
May 0.29"
June 0.40"
July 4.01"
August 4.39"
September 2.43"
October 0.90"
November 0.69"
December 1.88"
Annual total 19.91"

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 616
Heating degree days How much heating the climate demands 3,992
Approximate annual cooling cost At 15.23¢/kWh, Arizona average $94
Approximate annual electric heating cost Lower where heating is gas rather than electric $213

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 Pima County, where electricity is one line of eight.

Common questions

What is the weather like in Pima County?

Pima County averages a high of 80.3°F in July and a low of 33.6°F in January. Annual precipitation is 19.91 inches, including 8 inches of snow.

When is the rainy season in Pima County?

The wettest stretch is Jul, Aug, Sep, which accounts for 54% 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 Pima County?

The average daily high in July, the hottest month, is 80.3°F. That drives 616 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Pima County?

Yes. Pima County averages 8 inches of snow a year.

Sources

  • Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station KITT PEAK, AZ US (USC00024675), 15.9 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, Arizona residential average.
  • Wet-season share is the wettest three consecutive months as a percentage of annual precipitation, calculated from the monthly normals.