The summary climate graph for Phoenix, AZ shows a selection of temperature, rainfall and snow minimum, mean and maximum measures over the course of a year. Click on each of the measures in the key to toggle them on and off.
The warmest month in Phoenix Sky HAir Reserve Baseor International, Phoenix, Arizona is July with an average high temperature of 107.1°F. The hottest day on record was July 16 1979 when the temperature hit 122.9°F. During December the overnight temperature drops to an average of 43.5°F with the lowest temperature of 25.0°F being recorded on November 20 1985.
The warmest days on record are:
| 16 Jul 1979 | 122.9°F |
| 27 Jun 1990 | 122°F |
| 29 Jul 1995 | 120°F |
| 5 Jul 1989 | 118°F |
| 22 Jul 2006 | 118°F |
The warmest months on average were:
| July 1989 | 111.2°F |
| July 2009 | 110.8°F |
| August 2011 | 110.2°F |
| July 2003 | 110.1°F |
| July 2005 | 109.2°F |
The coldest days on record are:
| 20 Nov 1985 | 25°F |
| 9 Dec 1978 | 25.9°F |
| 25 Dec 1974 | 26.1°F |
| 3 Jan 1976 | 26.1°F |
| 24 Dec 1990 | 26.1°F |
The coldest months on average were:
| December 1974 | 35.8°F |
| January 1975 | 36.2°F |
| February 1975 | 37.8°F |
| February 1974 | 38.7°F |
| January 1979 | 38.9°F |
The wettest month by average rainfall in Phoenix, AZ is January with an average of 1.6 inches of rain falling on 4 to 5 days.Although in July it typically rains on more days with 1.2 inches falling in 5 to 6 days. The driest month in Phoenix, AZ is June with an average of 0.2 inches of rain falling on 1 to 2 days.
The wettest days on record are:
| 30 September 1983 | 1.7 inches |
| 7 September 1984 | 1.5 inches |
| 3 September 1994 | 1.4 inches |
| 20 September 1999 | 1.1 inches |
| 28 September 1977 | 1 inches |
The wettest months on record are:
| January 1973 | 22.3 inches |
| March 1973 | 10.8 inches |
| April 1994 | 9 inches |
| January 1993 | 7.4 inches |
| July 1984 | 6.8 inches |
The driest months on record are:
| June 1982 | 0 inches |
| May 1978 | 0 inches |
| November 1977 | 0 inches |
| September 1978 | 0 inches |
| April 1982 | 0 inches |