Lewisville is blessed with abundant sunshine: over 234 sunny days are enjoyed annually. Not surprisingly, temperatures are high, with 96 days reaching over 90 degrees. Sixty-six degrees is the year-round average, and Lewisville residents can expect about 79 rainy days and 39 freezing days. The warmest months are July and August with average high temperatures of 95 degrees and average lows of 74 degrees. The coolest month is January, with temperatures ranging from 35 to 55 degrees.

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