Decatur Seasonal temperature break down - The average median temperature March through May is approximately 62°F with highs averaging at 74°F and lows averaging at 51°F. June through August has an approximate average median temperature of 77°F with highs averaging at 89°F, lows typically average at 68°F. Average median temperatures September through November average out at 62°F, high temperatures average out at 76°F and lows average at 51°F.
The average median temperature December through February is approximately 47°F with highs averaging at 57°F, lows average out at 39°F.
The average Decatur annual median temperature averages out at approximately 62°F. The coldest month in Decatur is January with a median temperature of 41°F, the average high for the month of January is 52°F with an average low of 34°F. The hottest month in Decatur is July with an approximate median temperature of 78°F, the average high for the month of July is 89°F with an average low of 69°F.