Hattiesburg, MS Climate

Climate Insight: Hattiesburg, MS

Based on station USC00223887 feeding NOAA's 1991–2020 climate normals, Hattiesburg, Mississippi averages 66°F a year, ranging from a mean daily high of 77°F to a mean daily low of 55°F. July is typically the warmest month of the year, while January is the coldest. Because these figures are thirty-year averages rather than any single year's readings, they describe the typical month, not a forecast for it.

Hattiesburg averages 64.4 inches of precipitation a year, with 0.9 inches typically falling as snow, and that matters as much to daily life here as temperature does. The frost-free season averages 261 days, which directly shapes the planting calendar and growing potential for the area, with the last spring freeze near March 7 and the first fall freeze near November 23. As for energy demand, 1,922 heating degree days and 2,440 cooling degree days tell the story of how often furnaces and air conditioners run during a normal year.

On PlainClimate's composite comfort index, Hattiesburg scores 77/100 (Good), a blended measure that weighs temperature mildness, precipitation moderation, and extreme-weather frequency against one another. The monthly tables above turn that into a planning tool: expect the mildest highs and lows in the shoulder seasons, July-driven heat at the peak of summer, and January-driven cold at the depth of winter. Every number here is a thirty-year average, not a forecast, so any given year can and does run warmer, cooler, wetter, or drier than the normal.