The normal annual precipitation measures . Rainfall is ample throughout the year, though dry spells do occur. Severe weather of Houston mostly takes the form of flooding, which occurs most commonly in the months of May to October, which is the city's wet season. Supercell thunderstorms sometimes bring tornadoes to the area, most commonly during spring. Houston sometimes experiences tropical cyclones during the Atlantic hurricane season, which can bring heavy rain and significant damage to the city. The last hurricane to hit was Hurricane Harvey in 2017.