The average annual precipitation in the city is 58 @.@ 65 in ( 1 @,@ 490 mm ) . Rainfall is fairly evenly distributed throughout the year , and the wettest month of the year is March , in which an average of 6 @.@ 93 in ( 176 mm ) of rain falls . Much rainfall is delivered by thunderstorms which are common during the summer months but occur throughout the year . Severe thunderstorms - which can produce damaging winds and / or large hail in addition to the usual hazards of lightning and heavy rain - occasionally occur . These are most common during the spring months with a secondary peak during the Fall months . These storms also bring the risk of tornadoes .