Tucson Weather and Climate
Tucson Az has two major seasons, summer and winter; plus three minor seasons: fall, spring, and the monsoon.
Summer in Tucson
Summer is characterized by low humidity, clear skies, and daytime high temperatures that exceed 100 degrees Fahrenheit (37°C). The average overnight temperature ranges between 68°F (20°C) and 85°F (29°C).
The monsoon can begin any time from mid-June to late July, with an average start date around July 3. It typically continues through August and sometimes into September.[8] During the monsoon, the humidity is much higher than the rest of the year. It begins with clouds building up from the south in the early afternoon followed by intense thunderstorms and rainfall, which can cause flash floods. The evening sky at this time of year is often pierced with dramatic lightning strikes. Large areas of the city do not have storm sewers, so monsoon rains flood the main thoroughfares, usually for no longer than a few hours. A few underpasses in Tucson have "feet of water" scales painted on their supports to discourage fording by automobiles during a rainstorm.[9] Arizona traffic code Title 28-910, the so-called "Stupid Motorist Law", was instituted in 1995 to discourage people from entering flooded roadways. If the road is flooded and a barricade is in place, motorists who drive around the barricade can be charged up to $2000 for costs involved in rescuing them.[10]
Fall in Tucson
The weather in the Fall is much like spring: dry, with cool nights and warm to hot days. Temperatures above 100 degrees occur into early October. Average daytime highs of 84 °F (28 °C), with overnight lows of 55 °F (13 °C), are typical in the fall, with mean daily temperatures falling more rapidly from October to December.
Winter in Tucson
Winters in Tucson are mild relative to other parts of the United States. Daytime highs in the winter range between 64 °F and 75 °F (18−23 °C), with overnight lows between 30 °F and 44 °F (-1 –7 °C). Although rare, snow has been known to fall in Tucson, usually a light dusting that melts within a day.
Spring in Tucson
Early Spring is characterized by gradually rising temperatures and several weeks of vivid wildflower blooms beginning in late February and into March. Daytime average highs range from 72 °F (23 °C) in March to 88 °F (31 °C) in May with average overnight lows in March of 45 °F (7 °C) and in May of 59 °F (15 °C).
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