Las Vegas has a desert climate with very little rainfall, and extreme heat in the summer; highs of 105 °F (40 °C) are common from May to September, and for several days each year, temperatures may exceed 115 °F (46 °C). The warmest temperature ever recorded is 117 °F, set on July 24, 1942 at present-day Nellis Air Force Base, and July 19, 2005 at McCarran International Airport. Winters are cool and windy, with the balance of Las Vegas' annual 4.2 in (102 mm) of rainfall coming from January to March. Showers also occur, but less frequently, in the Spring or Autumn. July through September, the Mexican Monsoon often brings enough moisture from the Gulf of Mexico across Mexico and into the southwest to cause afternoon thunderstorms. Although winter snows are usually visible from December to June on the mountains surrounding the valley, it rarely snows in Las Vegas itself.

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