San Antonio falls near the western edge of the humid subtropical climate zone. Its weather is alternately dry or humid depending on prevailing winds, turning hot in the summer, warm to cool winters subject to descending northern cold fronts in the winter with cool to cold nights, and comfortably warm and rainy in the spring and fall. San Antonio receives about a dozen sub-freezing nights each year, occasionally (about once every couple of winters) seeing some sort of wintry precipitation (i.e. sleet/freezing rain), but accumulation and snow itself is not very common. Many winters may pass without any freezing precipitation at all. According to the National Weather Service, there have been 31 instances of snowfall (a trace or more) in the city in the past 122 years, for an average of about once every four years. However a decade or more may pass between snowfalls. In San Antonio, July and August tie for the average warmest months with an average high of 95 degrees Fahrenheit (35 °C). The highest temperature ever to be recorded was 111 °F (44 °C) on September 5, 2000. The average coolest month is January. The lowest recorded temperature ever was 0 °F (-18 °C) on January 31, 1949. May, June, and October have quite a bit of precipitation. For the last 135 years, the average annual precipitation has been 29.05 inches (738 mm), with a maximum of 52.28 inches (1,328 mm) and a minimum of 10.11 inches (256.8 mm) in one year.
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