CLIMATE:
Las Vegas' climate is an arid desert climate (Koppen climate classification BWh) typical of the Mojave Desert, in which it is located, marked with very hot summers, mild winters, abundant sunshine year-round, and very little rainfall. Temperatures in the 90s °F (mid-30s °C) are common in the months of May, June, and September and temperatures normally exceed 100 °F (38 °C) most days in the months of July and August, but with very low humidity, frequently under 10%. The hottest temperature ever recorded is 117 °F (47 °C) set twice, on July 19, 2005, at McCarran International Airport (the warmest ever recorded there) and July 24, 1942, at present-day Nellis Air Force Base. Winters are cool and windy, with the majority of Las Vegas' annual 4.49 in (114 mm) of rainfall coming from January to March.[4] Winter daytime highs are normally around 60 °F (16 °C) and winter nighttime lows are usually around 40 °F (4 °C). The coldest temperature ever recorded is 8 °F (−13 °C) set on January 25, 1937, at present-day Nellis Air Force Base. Showers occur less frequently in the Spring or Autumn. July through September, the Mexican Monsoon often brings enough moisture from the Gulf of California across Mexico and into the southwest to cause afternoon and evening thunderstorms. Although winter snow is usually visible from December to May on the mountains surrounding Las Vegas, it rarely snows in the city itself.
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