Lawton lies in a dry subtropical climate , with frequent variations in weather daily, except during the constantly hot and dry summer. Frequent strong winds, usually from the south or south-southeast during the summer, help to lessen the hotter weather. Northerly winds during the winter can occasionally intensify cold periods.
The average mean temperature for southwest Oklahoma is 61.9°F (16.6°C). The summers can be extremely hot; Lawton averages 21 days with temperatures 100°F (37.8°C) and above. The winters are typically mild, though periods of extreme cold can occur. Lawton averages eight days that fail to rise above freezing. The city receives about 31.6 inches (800 mm) of precipitation and less than 3 in (80 mm) of snow annually.
Lawton is located squarely in the area known as Tornado Alley and is prone to severe weather from late April through early June. Most notably, an F4 tornado in 1957, and an F3 tornado in 1979 struck the southern region of the city.