Oklahoma City Climate

Oklahoma City lies in a temperate, sub-humid climate, with frequent variations in weather daily and seasonally, except during the consistently hot and humid summer months. Consistent winds, usually from the south or south-southeast during the summer, help temper the hotter weather. Consistent northerly winds during the winter can intensify cold periods.

The summer can be extremely hot, as was evident in 2006 with a few-weeks span of nearly 110°F (43°C) temperatures. The average temperature is 60.0°F (15.6°C),  though colder though the winter months, with a 37.0°F (2.8°C) average in January, and warmer during the summer months, with an 82.0°F (27.8°C) average in July.  The city receives about 33.3 inches (850 mm) of rain annually and 9.0 inches (230 mm) of snow.

Oklahoma City has a severe weather season from March through August, especially during April and May. Tornadoes have occurred in every month of the year. Oklahoma City has become one of the most tornado prone cities in the United States.  Since the time weather records have been kept, Oklahoma City has been struck by nine violent tornadoes, eight F4's and one F5.  On May 3, 1999 parts of southern Oklahoma City and nearby communities suffered one of the most powerful tornadoes on record an F-5 on the Fujita Scale, with wind speeds topping 320 mph (510 km/h). This tornado was part of the 1999 Oklahoma tornado outbreak.

Source: Wikipedia