Phoenix Weather Averages

Phoenix, Arizona enjoys sunny, dry weather year round. It's the temperature that varies the most. Winters are pleasantly mild, springs and falls are warm, while daytime highs of over 100 degree F (above 38 °C) are the norm throughout summers.

This page gives detailed information on the annual temperature, precipitation, sun, humidity, wind and storm averages for Phoenix. The weather measurements are averages based on climate data gathered at Phoenix Sky Harbor International Airport, located near the city center.

Temperature

87 °F	annual average high	31 °C
64 °F	annual average low	18 °C

Phoenix's coldest days of the year usually occur in late December when the daily maximum temperature averages 65 degrees Fahrenheit (18 degrees Celsius) and the minimum averages 44 °F (7 °C).

The year's hottest days are normally in late June through the first half of July. The average temperature peaks then with daily highs of 107 °F (42 °C). The hottest nights occur during the second half of July when the daily low averages 85 °F (29 °C).

234 days	80 °F max. or more (27 °C)
88 days	50 °F min. or less (10 °C)

Phoenix averages 111 days a year when the thermometer reaches into the 100s °F (over 38 °C).

The thermometer dips to 40 °F (4 °C) or below on an average of 14 nights a year. Most years, Phoenix does not get cold enough for frost.

Rain

7.2 in	total precipitation	183 mm
33 days	of rain

Phoenix is dry all year, with no single month averaging more than one inch of rain. May and June are usually the driest months, each typically receiving less an eighth of an inch of rain.

Sun

85 %	sunshine
211 days	clear skies

The sun's rays reach the ground in Phoenix during 85 percent of daylight hours on average year round, for a total of 3778 hours annually. Typically on 211 days a year the sky is mainly clear, with at most 30 percent cloud cover.

Sunlight in Phoenix averages 12 hours and 10 minutes a day. The shortest days of the year in mid December have 9 hours and 56 minutes of daylight. The year's longest days in mid June last 14:23 from sunrise to sunset.

Humidity

37 %	average humidity

The annual average for relative humidity in Phoenix ranges throughout the day from 51 percent at 5:00 am to 23 percent at 5:00 pm.

Local Time	2 am	5 am	8 am	11 am	2 pm	5 pm	8 pm	11 pm
Humidity %	46	51	47	32	24	23	31	39

Wind

6.2 mph

wind speed average

10.0 kph

July is usually the windiest month for Phoenix, while the wind is calmest during December.

Storms

1 day	precipitation of 1 inch (25 mm) or more
25 days	with thunderstorms a year

Thunderstorms usually appear over Phoenix from May to October.