Tucson has five seasons: Two major seasons, summer and winter, plus three minor seasons, Autumn, Spring, and Monsoon season.
Summer is characterized by low humidity, clear skies, and daytime high temperatures that exceed 100 degrees Farenheit. The average overnight temperature ranges between 69° F and 74° F.
Winters in Tucson are mild relative to other parts of the United States. Daytime heights in winter usually are between 64° F and 69° F, with overnight lows between 38° F and 44° F.
Monsoon season typically begins in July, but can begin anytime from June to August. During monsoon season the humidity is much higher than the rest of the year. This period 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.
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