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Monthly climate in Decatur, Texas, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Decatur features a humid subtropical climate (Cfa).Temperatures typically range between 7 °C (45 °F) and 29 °C (85 °F) through the year, but rarely can drop to -21 °C (-5 °F) or can rise to as high as 42 °C (109 °F).The average annual precipitation amounts to about 953 mm (37.5 inches) and receives 92 rainy days on the 1 mm (0.04 inches) threshold annually.Decatur enjoys an average of 3192 hours of sunshine throughout the year, and daylight varies from 9 hours 58 minutes to 14 hours 18 minutes per day.

Monthly average temperatures in Decatur, Texas, United States §

The warmest months in Decatur are June, July and August, with daily mean temperatures ranging from 27 to 29 °C (81 - 85 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 7 to 10 °C (45 - 50 °F) throughout the day. On average each year, Decatur experiences 167 days above 25 °C (77.0 °F) and 25 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, Texas, 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 26°C
(79°F)		 31°C
(89°F)		 32°C
(90°F)		 35°C
(94°F)		 36°C
(97°F)		 38°C
(101°F)		 42°C
(109°F)		 40°C
(105°F)		 37°C
(100°F)		 35°C
(95°F)		 32°C
(90°F)		 28°C
(83°F)
Mean maximum 23°C
(74°F)		 27°C
(82°F)		 29°C
(85°F)		 32°C
(90°F)		 34°C
(94°F)		 36°C
(97°F)		 39°C
(102°F)		 38°C
(101°F)		 36°C
(97°F)		 33°C
(92°F)		 27°C
(82°F)		 25°C
(77°F)
Average high 13°C
(56°F)		 15°C
(59°F)		 21°C
(70°F)		 24°C
(75°F)		 28°C
(83°F)		 32°C
(90°F)		 34°C
(94°F)		 34°C
(94°F)		 31°C
(88°F)		 25°C
(77°F)		 19°C
(67°F)		 16°C
(61°F)
Daily mean 7°C
(45°F)		 9°C
(48°F)		 15°C
(59°F)		 18°C
(64°F)		 23°C
(74°F)		 27°C
(81°F)		 29°C
(85°F)		 29°C
(84°F)		 26°C
(78°F)		 19°C
(67°F)		 13°C
(55°F)		 10°C
(50°F)
Average low 2°C
(36°F)		 3°C
(38°F)		 9°C
(49°F)		 12°C
(54°F)		 18°C
(65°F)		 22°C
(72°F)		 24°C
(76°F)		 24°C
(75°F)		 20°C
(69°F)		 14°C
(57°F)		 7°C
(45°F)		 5°C
(41°F)
Mean minimum -8°C
(18°F)		 -7°C
(19°F)		 -0°C
(32°F)		 3°C
(37°F)		 10°C
(50°F)		 18°C
(66°F)		 20°C
(69°F)		 20°C
(68°F)		 14°C
(57°F)		 3°C
(37°F)		 -2°C
(28°F)		 -3°C
(27°F)
Minimum -14°C
(7°F)		 -21°C
(-5°F)		 -7°C
(20°F)		 0°C
(33°F)		 6°C
(42°F)		 16°C
(61°F)		 18°C
(64°F)		 19°C
(66°F)		 10°C
(50°F)		 1°C
(34°F)		 -6°C
(22°F)		 -7°C
(20°F)

Compare climate in Decatur with other places

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

Monthly average precipitation in Decatur, Texas, United States §

Decatur usually has the most precipitation in April, May and October, with an average of 9 rainy days and 116 mm (4.6 inches) of precipitation per month.The driest months in Decatur are July, November and December. On average, 48 mm (1.9 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Decatur, Texas, 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) 51 (2.0) 78 (3.1) 85 (3.3) 91 (3.6) 135 (5.3) 86 (3.4) 44 (1.7) 82 (3.2) 81 (3.2) 121 (4.8) 50 (2.0) 49 (1.9)
Average precipitation days (≥ 1 mm) 7 9 9 8 11 7 8 8 7 8 5 5

Monthly sunshine hours in Decatur, Texas, United States §

The sunniest months in Decatur are June, July and August, when the sun shines an average of 11 hours 12 minutes a day.Least sunny months in Decatur: January, February and December receive an average of 6 hours 27 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Decatur, Texas, 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 178 182 242 262 289 340 360 329 280 263 235 227
Mean daily daylight hours 10h 13m 10h 59m 11h 59m 13h 1m 13h 52m 14h 18m 14h 4m 13h 18m 12h 19m 11h 18m 10h 25m 9h 58m

Solar UV radiation in Decatur, Texas, United States §

Decatur experiences the highest level of ultraviolet (UV) radiation in May, July and August, when the maximum UV index can reach values of 11 - 11, which corresponds to the Extreme category of sun exposure.January, February and December are in the Moderate / High exposure category. In these months, the maximum values of the UV index do not exceed 6. For more detailed information, check out our hourly Decatur UV Index data.

Average daily maximum UV levels by month for Decatur, Texas, 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) 4 6 8 10 11 11 11 11 10 8 6 4