2025 Compare Climate & Weather:
Chattanooga, TN vs Decatur, AL

Highlights

On average, there are 204 sunny days per year in Decatur. Chattanooga averages 207 sunny days per year. The US average is 205 sunny days.

Decatur, Alabama gets 53.6 inches of rain, on average, per year. Chattanooga, Tennessee gets 51.1 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Decatur averages 1.5 inches of snow per year. Chattanooga averages 1.5 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

Decatur, Alabama
Summer High: the July high is around 89.4 degrees
Winter Low: the January low is 30.2
Rain: averages 53.6 inches of rain a year
Snow: averages 1.5 inches of snow a year

Chattanooga, Tennessee
Summer High: the July high is around 89 degrees
Winter Low: the January low is 28.9
Rain: averages 51.1 inches of rain a year
Snow: averages 1.5 inches of snow a year

BestPlaces Comfort Index

The annual BestPlaces Comfort Index for Decatur is 7.3 (10=best), which means it is about average compared to other places in Alabama.

The annual BestPlaces Comfort Index for Chattanooga is 7.5 (10=best), which means it is one of the most pleasant places in Tennessee.

Today's Weather - Chattanooga, TN

58°F

Today's Weather - Decatur, AL

57°F

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Chattanooga / Decatur

July is the hottest month for Chattanooga with an average high temperature of 89.0°, which ranks it as warmer than most places in Tennessee. In Chattanooga, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Chattanooga are May, September and October.

August is the hottest month for Decatur with an average high temperature of 89.7°, which ranks it as cooler than most places in Alabama. In Decatur, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Decatur are May, October and April.

January has the coldest nighttime temperatures for Chattanooga with an average of 28.9°. This is one of the warmest places in Tennessee.

January has the coldest nighttime temperatures for Decatur with an average of 30.2°. This is colder than most places in Alabama.

In Chattanooga, there are 39.0 days annually when the high temperature is over 90°, which is hotter than most places in Tennessee.

In Decatur, there are 43.8 days annually when the high temperature is over 90°, which is cooler than most places in Alabama.

In Chattanooga, there are 71.4 days annually when the nighttime low temperature falls below freezing, which is one of the warmest places in Tennessee.

In Decatur, there are 63.9 days annually when the nighttime low temperature falls below freezing, which is colder than most places in Alabama.

In Chattanooga, there are 0.1 days annually when the nighttime low temperature falls below zero°, which is one of the warmest places in Tennessee.

In Decatur, there are 0.1 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Alabama.

December is the wettest month in Chattanooga with 4.9 inches of rain, and the driest month is October with 3.2 inches. The wettest season is Spring with 29% of yearly precipitation and 23% occurs in Autumn, which is the driest season. The annual rainfall of 51.1 inches in Chattanooga means that it is drier than most places in Tennessee.


December is the wettest month in Decatur with 5.7 inches of rain, and the driest month is August with 3.5 inches. The wettest season is Spring with 29% of yearly precipitation and 22% occurs in Winter, which is the driest season. The annual rainfall of 53.6 inches in Decatur means that it is drier than most places in Alabama.

December is the rainiest month in Chattanooga with 9.2 days of rain, and October is the driest month with only 6.3 rainy days. There are 99.0 rainy days annually in Chattanooga, which is one of the least rainy places in Tennessee. The rainiest season is Spring when it rains 28% of the time and the driest is Winter with only a 21% chance of a rainy day.

December is the rainiest month in Decatur with 11.0 days of rain, and September is the driest month with only 7.5 rainy days. There are 118.0 rainy days annually in Decatur, which is one of the rainiest places in Alabama. The rainiest season is Spring when it rains 27% of the time and the driest is Winter with only a 21% chance of a rainy day.

An annual snowfall of 1.5 inches in Chattanooga means that it is one of the least snowy places in Tennessee.

An annual snowfall of 1.5 inches in Decatur means that it is snowier than most places in Alabama.

January is the snowiest month in Chattanooga with 0.6 inches of snow, and 1 month of the year have significant snowfall.

January is the snowiest month in Decatur with 0.7 inches of snow, and 1 month of the year have significant snowfall.