Pima County, AZ Climate

Pima County, Arizona has a desert climate with hot summers and mild winters. The average temperature for the year is around 75 degrees Fahrenheit, with temperatures often surpassing 100 degrees in the summer months and rarely falling below freezing during the winter. Rainfall is scarce, averaging around 11 inches per year, and humidity levels are low throughout the year. Snow can occasionally occur in winter months, typically at elevations higher than 4500 feet, though most years see little snowfall. Despite its dry climate, Pima County is full of lush vegetation due to the county's location near the Santa Cruz River.

Pima County, Arizona gets 13 inches of rain, on average, per year. The US average is 38 inches of rain per year.

Pima County averages 1 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 285 sunny days per year in Pima County. The US average is 205 sunny days.

Pima County gets some kind of precipitation, on average, 50 days per year. Precipitation is rain, snow, sleet, or hail that falls to the ground. In order for precipitation to be counted you have to get at least .01 inches on the ground to measure.

Weather Highlights

Summer High: the July high is around 100 degrees
Winter Low: the January low is 38
Rain: averages 13 inches of rain a year
Snow: averages 1 inches of snow a year

Bestplaces Comfort Index

The annual BestPlaces Comfort Index for Pima County is 7.6 (10=best), which means it is about average compared to other places in Arizona.

5.1 Summer - 8.4 Winter

April, October and March are the most pleasant months in Pima County, while July and August are the least comfortable months.

Climate	Pima, Arizona	United States
	12.9 in.	38.1 in.
	0.6 in.	27.8 in.
	50.2 days	106.2 days
	285 days	205 days
	100.0°	85.8°
	37.8°	21.7°
	7.6	7
	6.5	4.3
	2652 ft.	2443 ft.

Climate

YOU SHOULD KNOW

Many people confuse weather and climate but they are different. Weather is the conditions of the atmosphere over a short period of time, and climate is how the atmosphere is over long periods of time.

Weather is how the atmosphere is behaving and its effects upon life and human activities. Weather can change from minute-to-minute. Most people think of weather in terms of temperature, humidity, precipitation, cloudiness, brightness, visibility, wind, and atmospheric pressure.

Climate is the description of the long-term pattern of weather in a place. Climate can mean the average weather for a particular region and time period taken over 30 years. Climate is the average of weather over time.

June is the hottest month for Pima County with an average high temperature of 100.2°, which ranks it as about average compared to other places in Arizona. In Pima County, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Pima County are March, November and April.

In Pima County, there are 146.3 days annually when the high temperature is over 90°, which is hotter than most places in Arizona.

December has the coldest nighttime temperatures for Pima County with an average of 37.0°. This is warmer than most places in Arizona.

In Pima County, there are 24.1 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Arizona.

In Pima County, there are 0.0 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in Arizona.

Humidity in Pima County is generally quite low and comfortable. There are few days during the summer when the humidity becomes unpleasant. The most humid months (but still comfortable) are August, July and September.

August is the wettest month in Pima County with 2.6 inches of rain, and the driest month is May with 0.2 inches. The wettest season is Autumn with 40% of yearly precipitation and 12% occurs in Summer, which is the driest season. The annual rainfall of 12.9 inches in Pima County means that it is about average compared to other places in Arizona.

August is the rainiest month in Pima County with 9.4 days of rain, and June is the driest month with only 1.4 rainy days. There are 50.2 rainy days annually in Pima County, which is about average compared to other places in Arizona. The rainiest season is Autumn when it rains 38% of the time and the driest is Summer with only a 15% chance of a rainy day.

An annual snowfall of 0.6 inches in Pima County means that it is about average compared to other places in Arizona. December is the snowiest month in Pima County with 0.2 inches of snow, and no months of the year have significant snowfall.

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