Tucson is renowned for its superb weather. Warm and sunny throughout most of the year, the air is remarkably dry, with a low relative humidity. Though daytime summer temperatures are high, the temperature drops at sunset, providing cool, comfortable evenings.
Wettest month -- July
Driest month -- May
Number of days over 90°F = 138. Number of days below 32°F = 19. History of hurricanes, tornadoes: None. Average total snow, sleet and hail annually: 0.6 inches. Tucson lies in the zone receiving more sunshine than any other section in the United States.