<P> Summer is characterized by daytime temperatures that exceed 100 ° F (38 ° C) and overnight temperatures between 66 and 85 ° F (19 and 29 ° C). Early summer is characterized by low humidity and clear skies; mid-summer and late summer are characterized by higher humidity, cloudy skies and frequent rain . </P> <P> 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 . 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 . 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 . Despite all warnings and precautions, however, three Tucson drivers have drowned between 2004 and 2010 . </P> <P> The weather in the fall is much like that during spring: dry, with cool nights and warm, hot days . Temperatures above 100 ° F (38 ° C) are possible into early October . Temperatures decline at the quickest rate in October and November, and are normally the coolest in late December and early January . </P> <P> Winters in Tucson are mild relative to other parts of the United States . Daytime highs in the winter range between 64 and 75 ° F (18 and 24 ° C), with overnight lows between 30 and 44 ° F (− 1 and 7 ° C). Tucson typically averages one hard freeze per winter season, with temperatures dipping to the mid or low - 20s (− 7 to − 4 ° C), but this is typically limited to only a very few nights . Although rare, snow has been known to fall in Tucson, usually a light dusting that melts within a day . The most recent snowfall was on February 20, 2013 when 2.0 inches of snow blanketed the city, the largest snowfall since 1987 . </P>

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