Deltona's climate is classified as a humid subtropical climate in the "Cfa" Köppen climate classification, meaning it typically has hot, humid summers and mild winters. The record high temperature is recorded in July 1998, with a record low of recorded in January 1985. Rainfall averages around a year, with the wettest months being June through September. The hurricane season lasts from June 1 to November 30, with September as the most susceptible month to hurricanes. The most powerful hurricane to strike Deltona since its incorporation was Charley in 2004, during which the eye of the hurricane passed directly over the city; that same year, the city would also suffer from the effects of hurricanes Frances and Jeanne.