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 fall are warm, while daytime highs of over 100 degree F (above 38 °C) are the norm throughout summer.

This page gives detailed information on the annual weather averages for Phoenix. You can jump directly to data and descriptions for:

The temperature and rainfall numbers here are historical averages based on climate data gathered in downtown Phoenix. The rest of the weather measurements are averages at the Phoenix Sky Harbor International Airport, located a few miles southeast of the city center.

Temperature

87 °F	annual average high	31 °C
63 °F	annual average low	17 °C

Phoenix's coldest days of the year usually occur in mid December when the daily maximum temperature averages 67 degrees Fahrenheit (19 degrees Celsius) and the minimum averages 44 °F (7 °C).

The year's hottest days are normally in early July. The average temperature peaks then with daily highs of 107 °F (41 °C). The hottest nights occur late in July with an average low of 83 °F (28 °C).

232 days	80 °F maximum or above (27 °C)
89 days	50 °F minimum or below (10 °C)

Phoenix averages 107 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

8.2 inches	total yearly precipitation	208 millimetres
30 days	of rain

July is usually the wettest month of the year in Phoenix, while June is the driest.

Sun

85 %	sunshine annually
211 days	with 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

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

Thunderstorms usually appear over Phoenix from May to October.