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Monthly climate in Decatur, Tennessee, United States

Last updated: March 2, 2024

Under the Köppen–Geiger climate classification Decatur features a humid subtropical climate (Cfa). Temperatures typically range between 6 °C (43 °F) and 27 °C (80 °F) through the year, but rarely can drop to -12 °C (10 °F) or can rise to as high as 37 °C (100 °F). The average annual precipitation amounts to about 1459 mm (57.4 inches) and receives 136 rainy days on the 1 mm (0.04 inches) threshold annually. Decatur enjoys an average of 2957 hours of sunshine throughout the year, and daylight varies from 9 hours 47 minutes to 14 hours 30 minutes per day.

Monthly average temperatures in Decatur, Tennessee, United States §

The warmest months in Decatur are June, July and August, with daily mean temperatures ranging from 24 to 27 °C (76 - 80 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 6 to 9 °C (43 - 48 °F) throughout the day. On average each year, Decatur experiences 139 days above 25 °C (77.0 °F) and 30 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Decatur, Tennessee, United States. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Maximum 24°C
(75°F)		 26°C
(79°F)		 29°C
(85°F)		 31°C
(89°F)		 34°C
(93°F)		 35°C
(94°F)		 37°C
(99°F)		 35°C
(96°F)		 37°C
(100°F)		 37°C
(98°F)		 27°C
(82°F)		 23°C
(73°F)
Mean maximum 21°C
(69°F)		 24°C
(75°F)		 26°C
(79°F)		 29°C
(85°F)		 32°C
(91°F)		 33°C
(92°F)		 35°C
(96°F)		 34°C
(93°F)		 34°C
(93°F)		 31°C
(88°F)		 24°C
(76°F)		 21°C
(70°F)
Average high 10°C
(51°F)		 14°C
(57°F)		 18°C
(64°F)		 22°C
(71°F)		 27°C
(80°F)		 29°C
(85°F)		 32°C
(89°F)		 31°C
(88°F)		 29°C
(85°F)		 24°C
(75°F)		 16°C
(61°F)		 13°C
(55°F)
Daily mean 6°C
(43°F)		 9°C
(48°F)		 12°C
(54°F)		 16°C
(61°F)		 21°C
(71°F)		 24°C
(76°F)		 27°C
(80°F)		 26°C
(79°F)		 24°C
(75°F)		 18°C
(65°F)		 10°C
(51°F)		 8°C
(47°F)
Average low 2°C
(36°F)		 4°C
(40°F)		 7°C
(45°F)		 10°C
(51°F)		 16°C
(62°F)		 20°C
(68°F)		 22°C
(73°F)		 22°C
(71°F)		 19°C
(67°F)		 13°C
(56°F)		 5°C
(41°F)		 4°C
(39°F)
Mean minimum -8°C
(19°F)		 -5°C
(24°F)		 -4°C
(25°F)		 1°C
(35°F)		 8°C
(46°F)		 15°C
(60°F)		 19°C
(66°F)		 18°C
(65°F)		 13°C
(55°F)		 4°C
(39°F)		 -2°C
(28°F)		 -4°C
(25°F)
Minimum -12°C
(10°F)		 -7°C
(21°F)		 -10°C
(14°F)		 -1°C
(31°F)		 4°C
(39°F)		 12°C
(53°F)		 17°C
(62°F)		 17°C
(62°F)		 10°C
(50°F)		 -1°C
(31°F)		 -6°C
(22°F)		 -8°C
(17°F)

Compare climate in Decatur with other places

Compare temperature, precipitation, sunshine, UV index in Decatur, Tennessee, United States with other places around the world.

Monthly average precipitation in Decatur, Tennessee, United States §

Decatur usually has the most precipitation in February, March and April, with an average of 12 rainy days and 162 mm (6.4 inches) of precipitation per month. The driest months in Decatur are January, September and November. On average, 90 mm (3.5 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Decatur, Tennessee, United States. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Average precipitation mm (inches) 98 (3.8) 173 (6.8) 162 (6.4) 152 (6.0) 120 (4.7) 104 (4.1) 108 (4.2) 114 (4.5) 93 (3.7) 124 (4.9) 78 (3.1) 133 (5.2)
Average precipitation days (≥ 1 mm) 10 15 13 10 11 13 15 13 9 9 8 10

Monthly sunshine hours in Decatur, Tennessee, United States §

The sunniest months in Decatur are June, July and August, when the sun shines an average of 10 hours 11 minutes a day. Least sunny months in Decatur: January, February and December receive an average of 5 hours 8 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Decatur, Tennessee, United States. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Mean monthly sunshine hours 145 155 224 262 301 306 321 308 279 257 227 167
Mean daily daylight hours 10h 3m 10h 54m 11h 59m 13h 6m 14h 2m 14h 30m 14h 15m 13h 25m 12h 21m 11h 14m 10h 16m 9h 47m

Solar UV radiation in Decatur, Tennessee, United States §

Decatur experiences the highest level of ultraviolet (UV) radiation in May, June and July, when the maximum UV index can reach values of 11 - 11, which corresponds to the Extreme category of sun exposure. January, November and December are in the Moderate exposure category. In these months, the maximum values of the UV index do not exceed 5. For more detailed information, check out our hourly Decatur UV Index data.

Average daily maximum UV levels by month for Decatur, Tennessee, United States. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
UV Index (month maximum) 3 6 8 10 11 11 11 10 9 7 5 3

Detailed Monthly Weather Insights for Decatur, Tennessee, United States

Discover in-depth weather details for every month in Decatur. Click through the links below for comprehensive overviews of temperature trends, precipitation levels, sunshine hours, and solar UV radiation specifics. Whether planning a visit or simply curious about Decatur's climate nuances, these monthly breakdowns provide the information you need for an informed understanding of what to expect throughout the year.

Each link leads to a detailed account of the typical weather conditions for that month, providing both locals and tourists with vital information to plan their daily activities, wardrobe, and travel itineraries accordingly.