Climate and monthly weather forecastDecatur, TN
Climate and monthly weather forecast
Weather in January
January, like December, is another chilly winter month in Decatur, Tennessee, with an average temperature fluctuating between 30.6°F (-0.8°C) and 45.5°F (7.5°C). January tends to be the coldest month, with temperatures averaging a daily high of 45.5°F (7.5°C) and a low of 30.6°F (-0.8°C). Weather in January »Weather in February
February, the last month of the winter in Decatur, is a fresh month, with an average temperature varying between 50.9°F (10.5°C) and 34.3°F (1.3°C). Decatur's transition into February brings a slight rise in the average high-temperature, moving from a chilly 45.5°F (7.5°C) in January to a fresh 50.9°F (10.5°C). Weather in February »Weather in March
The first month of the spring, March, is a moderate month in Decatur, Tennessee, with an average temperature ranging between max 58.6°F (14.8°C) and min 40.8°F (4.9°C). The arrival of March brings a soft temperature shift, with the average high-temperature nudging from a cool 50.9°F (10.5°C) in February to a refreshing 58.6°F (14.8°C). Weather in March »Weather in April
April is a pleasant spring month in Decatur, Tennessee, with an average temperature varying between 48.7°F (9.3°C) and 69.1°F (20.6°C). The beginning of April marks a shift in the average high-temperature, moving from March's refreshing 58.6°F (14.8°C) to an agreeable 69.1°F (20.6°C). Weather in April »Weather in May
May, the last month of the spring in Decatur, is a warm month, with an average temperature ranging between min 56.5°F (13.6°C) and max 77.7°F (25.4°C). With the onset of May, Decatur's average high-temperature sees a modest rise, moving from April's agreeable 69.1°F (20.6°C) to a moderately hot 77.7°F (25.4°C). Weather in May »Weather in June
June, the first month of the summer in Decatur, is still a warm month, with an average temperature ranging between min 63.1°F (17.3°C) and max 85.1°F (29.5°C). June's arrival coincides with a subtle temperature rise, moving from May's 77.7°F (25.4°C) to a still warm 85.1°F (29.5°C). Weather in June »Weather in July
July is a tropical summer month in Decatur, Tennessee, with an average temperature ranging between min 65.8°F (18.8°C) and max 87.6°F (30.9°C). July, known for its average high temperature of 87.6°F (30.9°C) and an average low temperature of 65.8°F (18.8°C), is the warmest month. In July, the heat index is estimated at a very hot 102.2°F (39°C). Weather in July »Weather in August
August, the last month of the summer in Decatur, is another hot month, with an average temperature fluctuating between 86.9°F (30.5°C) and 65.1°F (18.4°C). As Decatur welcomes August, the average high-temperature is noted at a still hot 86.9°F (30.5°C), closely aligning with the preceding month. Weather in August »Weather in September
The first month of the autumn, September, is still a warm month in Decatur, Tennessee, with temperature in the range of an average low of 59.9°F (15.5°C) and an average high of 81°F (27.2°C). September sees a slight reduction in average high-temperature, with a shift from a hot 86.9°F (30.5°C) in August to a moderately hot 81°F (27.2°C). Weather in September »Weather in October
October, like September, is an agreeable autumn month in Decatur, Tennessee, with temperature in the range of an average low of 49.1°F (9.5°C) and an average high of 69.6°F (20.9°C). Decatur's October weather comes with a decrease in average high-temperatures, moving from a warm 81°F (27.2°C) in September to an agreeable 69.6°F (20.9°C). Weather in October »Weather in November
November, the last month of the autumn in Decatur, is also a moderate month, with an average temperature fluctuating between 57.6°F (14.2°C) and 39.6°F (4.2°C). As November begins, there is a decrease in the average high-temperature, falling from a pleasant 69.6°F (20.9°C) in October to a mild 57.6°F (14.2°C). Weather in November »Weather in December
December, the first month of the winter in Decatur, is also a fresh month, with an average temperature varying between 50°F (10°C) and 35.8°F (2.1°C). The shift from November to December coincides with a small decrease in the average high-temperature, down to a cool 50°F (10°C) from a mild 57.6°F (14.2°C). Weather in December »Updated: Feb 14, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
The coldest month in Decatur is January, with an average high-temperature of 45.5°F (7.5°C) and an average low-temperature of 30.6°F (-0.8°C).
In Decatur, Tennessee, during the entire year, the rain falls for 171.8 days and collects up to 41.81" (1062mm) of precipitation.
January through April, November and December are months with snowfall in Decatur, Tennessee.
The month with the most snowfall in Decatur, Tennessee, is January, when snow falls for 4.8 days and typically aggregates up to 1.02" (26mm) of snow.
Throughout the year, in Decatur, there are 14.8 snowfall days, and 3.07" (78mm) of snow is accumulated.
The months with the lowest UV index are January, February and December, with an average maximum UV index of 2.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Decatur, Tennessee, and the time zone changes from EST to EDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from EDT to EST.
May through October are months without snowfall.
May through August, with an average maximum UV index of 6, are months with the highest UV index in Decatur.
June, August, October and November, with an average relative humidity of 75%, are the least humid months in Decatur.
The month with the longest days in Decatur, Tennessee, is June, with an average of 14h and 30min of daylight.
June and July, with an average of 10.4h of sunshine, are months with the most sunshine.
In Decatur, July registers the highest temperatures, averaging 87.6°F (30.9°C) at the peak and 65.8°F (18.8°C) at the lowest.
The wettest months are July and December, with an average 4.29" (109mm) of rainfall.
The month with the least rainfall in Decatur, Tennessee, is September, when the rain falls for 11.7 days and typically collects 2.32" (59mm) of precipitation.
With an average relative humidity of 80%, December is the most humid month in Decatur.
With an average of 9h and 48min of daylight, December has the shortest days of the year in Decatur.
With an average of 5h of sunshine, December has the least sunshine of the year.
Average temperature
Decatur, TN
The warmest month (with the highest average high temperature) is July (87.6°F).
The month with the lowest average high temperature is January (45.5°F).
The month with the highest average low temperature is July (65.8°F).
The coldest month (with the lowest average low temperature) is January (30.6°F).
Average pressure
Decatur, TN
- Average pressure in January:
30.16"Hg - Average pressure in February:
30.12"Hg - Average pressure in March:
30.09"Hg - Average pressure in April:
30"Hg - Average pressure in May:
30.02"Hg - Average pressure in June:
29.98"Hg
- Average pressure in July:
30.01"Hg - Average pressure in August:
30.01"Hg - Average pressure in September:
30.03"Hg - Average pressure in October:
30.06"Hg - Average pressure in November:
30.16"Hg - Average pressure in December:
30.15"Hg
The months with the highest atmospheric pressure are January and November (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.98"Hg).
Average wind speed
Decatur, TN
- Average wind speed in January:
6.2mph - Average wind speed in February:
6.5mph - Average wind speed in March:
6.5mph - Average wind speed in April:
6.5mph - Average wind speed in May:
5.2mph - Average wind speed in June:
4.5mph
- Average wind speed in July:
3.9mph - Average wind speed in August:
3.9mph - Average wind speed in September:
4.2mph - Average wind speed in October:
5.1mph - Average wind speed in November:
5.5mph - Average wind speed in December:
5.8mph
The windiest months (with the highest average wind speed) are February, March and April (6.5mph).
The calmest months (with the lowest average wind speed) are July and August (3.9mph).
Average humidity
Decatur, TN
The month with the highest relative humidity is December (80%).
The months with the lowest relative humidity are June, August, October and November (75%).
Average rainfall
Decatur, TN
- Average rainfall in January:
3.39" - Average rainfall in February:
4.09" - Average rainfall in March:
3.7" - Average rainfall in April:
4.06" - Average rainfall in May:
3.03" - Average rainfall in June:
3.39"
- Average rainfall in July:
4.29" - Average rainfall in August:
3.39" - Average rainfall in September:
2.32" - Average rainfall in October:
3.07" - Average rainfall in November:
2.8" - Average rainfall in December:
4.29"
The wettest months (with the highest rainfall) are July and December (4.29").
The driest month (with the least rainfall) is September (2.32").
Average rainfall days
Decatur, TN
- Average rainfall days in January:
12.5 days - Average rainfall days in February:
13.1 days - Average rainfall days in March:
15.9 days - Average rainfall days in April:
14.8 days - Average rainfall days in May:
17.2 days - Average rainfall days in June:
16.8 days
- Average rainfall days in July:
18.3 days - Average rainfall days in August:
17.7 days - Average rainfall days in September:
11.7 days - Average rainfall days in October:
10.7 days - Average rainfall days in November:
9.5 days - Average rainfall days in December:
13.6 days
The month with the highest number of rainy days is July (18.3 days).
The month with the least rainy days is November (9.5 days).
Average snowfall
Decatur, TN
The month with the highest snowfall is January (1.02").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days
Decatur, TN
- Average snowfall days in January:
4.8 days - Average snowfall days in February:
4.3 days - Average snowfall days in March:
2.2 days - Average snowfall days in April:
0.3 days - Average snowfall days in May:
0 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0 days - Average snowfall days in October:
0.3 days - Average snowfall days in November:
0.7 days - Average snowfall days in December:
2.2 days
The month with the highest number of snowfall days is January (4.8 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight / Average sunshine
Decatur, TN
- Average daylight in January:
10h and 6min - Average daylight in February:
10h and 54min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 6min - Average daylight in May:
14h and 6min - Average daylight in June:
14h and 30min
- Average daylight in July:
14h and 18min - Average daylight in August:
13h and 30min - Average daylight in September:
12h and 24min - Average daylight in October:
11h and 18min - Average daylight in November:
10h and 18min - Average daylight in December:
9h and 48min
The month with the longest days is June (Average daylight: 14h and 30min).
The month with the shortest days is December (Average daylight: 9h and 48min).
- Average sunshine in January:
5h and 12min - Average sunshine in February:
6h and 0min - Average sunshine in March:
6h and 30min - Average sunshine in April:
8h and 18min - Average sunshine in May:
9h and 48min - Average sunshine in June:
10h and 24min
- Average sunshine in July:
10h and 24min - Average sunshine in August:
9h and 36min - Average sunshine in September:
8h and 30min - Average sunshine in October:
7h and 6min - Average sunshine in November:
5h and 48min - Average sunshine in December:
5h and 0min
The months with the most sunshine are June and July (Average sunshine: 10h and 24min).
The month with the least sunshine is December (Average sunshine: 5h and 0min).
Average sunshine days
Decatur, TN
- Average sunshine days in January:
15 days - Average sunshine days in February:
12.1 days - Average sunshine days in March:
12.3 days - Average sunshine days in April:
13.3 days - Average sunshine days in May:
11.8 days - Average sunshine days in June:
11.3 days
- Average sunshine days in July:
10.2 days - Average sunshine days in August:
11.8 days - Average sunshine days in September:
16.4 days - Average sunshine days in October:
18.6 days - Average sunshine days in November:
18.5 days - Average sunshine days in December:
15.7 days
The month with the most sunshine days is October (18.6 days).
The month with the least sunshine days is July (10.2 days).
Average UV index
Decatur, TN
The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February and December (UV index 2).
Average cloud cover
Decatur, TN
The month with the most cloud cover is February (Cloud cover 52).
The month with the least cloud cover is June (Cloud cover 30).
Average visibility
Decatur, TN
The months with the highest visibility are February, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January and March (5mi).
