Mississippi has a humid subtropical climate with long summers and short, mild winters. Temperatures average about 85°F (about 28°C) in July and about 48 °F (about 9 °C) in January. The temperature varies little statewide in the summer; however, in winter, the region near Mississippi Sound is significantly warmer than the inland portion of the state. The recorded temperature in Mississippi has ranged from -19 °F (-28.3 °C), in 1966, at Corinth in the northeast, to 115 °F (46.1 °C), in 1930, at Holly Springs in the north. Heavy snowfall is possible across the state, such as during the New Year's Eve 1963 snowstorm. Yearly precipitation generally increases from north to south, with the regions closer to the Gulf being the most humid. Thus, Clarksdale, in the northwest, gets about 50 inches (about 1,270 mm) of precipitation annually and Biloxi, in the south, about 61 inches (about 1,550 mm). Small amounts of snow fall in northern and central Mississippi, although snow is occasional in the southern part of the state.

 

The late summer and fall is the seasonal period of risk for hurricanes moving inland from the Gulf of Mexico, especially in the southern part of the state. Hurricane Camille in 1969 and Hurricane Katrina in 2005, which killed 238 people in the state, are the most devastating hurricanes to hit the state, both causing nearly total storm surge damage around Gulfport, Biloxi and Pascagoula. As in the rest of the Deep South, thunderstorms are common in Mississippi, especially in the southern part of the state. On average, Mississippi has around 27 tornadoes annually; the northern part of the state has more tornadoes earlier in the year and the southern part a higher frequency later in the year. Two of the five deadliest tornadoes in US history have occurred in the state. These storms struck Natchez, in southwest Mississippi (see The Great Natchez Tornado) and Tupelo, in the northeast corner of the state. About six F5 tornadoes have been recorded in the state.