Climate and monthly weather forecastKnoxville, TN
Knoxville, Tennessee, USA - Climate and weather forecast by month. Detailed climate information with charts - average monthly weather with temperature, pressure, humidity, precipitation, wind, daylight, sunshine, visibility, and UV index data. Winters in Knoxville, spanning from December to February, extend the cool embrace with the coldest temperatures witnessed in January, dropping down to 29.3°F (-1.5°C). With steady patterns of rainfall throughout the year, periods of snow, and diverse temperature fluctuations, Knoxville presents a rich and varying weather scene.
Climate and monthly weather forecast
The climate of Knoxville
Knoxville, Tennessee, located in the United States, bears the classification of a Cfa climate zone under the Köppen Climate Classification - this signifies a humid subtropical climate with no dry season. With steady patterns of rainfall throughout the year, periods of snow, and diverse temperature fluctuations, Knoxville presents a rich and varying weather scene.Temperature variations unlock a treasure trove of climatological experiences. Annually, temperature ranges fluctuate between a low of 29.3°F (-1.5°C) in January to a high of 88.9°F (31.6°C) in July. While Knoxville experiences frosty temperatures in winter, it also luxuriates in warm and humid summers. Meanwhile, Knoxville witnesses a steady relative humidity pattern, with monthly averages oscillating from 70% to 78%.
Rainfall patterns paint an equally diverse tableau, with consistent showers sprinkled throughout the year. The city receives the highest rainfall measuring 3.66" (93mm) in February, tapering down to 1.5" (38mm) in September. Despite a minor fluctuation in rainfall volumes, the number of rainfall days remains consistently distributed, ranging from 8.4 days in November to 16.2 days in July.
Though Knoxville does curl up under a blanket of snow, it does so only in the cooler months. Snowfall totals are highest in February at 1.57" (40mm), dwindling down to zero from May to October.
The best time to visit Knoxville
With quite a varied climate, the best time to plan a visit to Knoxville hinges on personal preference. For sun-seekers and adventure enthusiasts who prefer warmer temperatures, the months from May to September offer an ideal period with highs hovering between 78.4°F (25.8°C) and 88.9°F (31.6°C). During these months, daylight hours stretch between 13.1 hours and 14.6 hours, offering plenty of time to explore the city and its surroundings.The worst time to visit Knoxville
For visitors averse to colder climates, the winter months of January and February might prove less appealing. During this period, temperatures edge down to lows of 29.3°F (-1.5°C) and 33.4°F (0.8°C) respectively. Snowfall makes an appearance as well, with an average of 0.87" (22mm) in January and a slightly higher average of 1.57" (40mm) in February.Spring weather in Knoxville
In Knoxville, Spring blossoms from March to May, as temperatures gently rise from 58.1°F (14.5°C) to 78.4°F (25.8°C). As flowers bloom, rainfall makes its presence felt as well with 2.8" (71mm) in April and 2.13" (54mm) in May. March sets the stage with a slightly lower amount, at 2.52" (64mm).Summer weather in Knoxville
Summers in Knoxville, extending from June to August, are characterized by hot and humid conditions. Temperatures peak to their highest at 88.9°F (31.6°C) in July. Rainfall takes a small dip during this season, with August receiving the lowest amount, at 2.01" (51mm).Autumn weather in Knoxville
Autumn in Knoxville, spreading its hues from September to November, is marked by a decrease in temperatures, from 82.2°F (27.9°C) in September to 57.2°F (14°C) in November. Rainfall sees a similar trend with the lowest amount experienced in September at 1.5" (38mm).Winter weather in Knoxville
Winters in Knoxville, spanning from December to February, extend the cool embrace with the coldest temperatures witnessed in January, dropping down to 29.3°F (-1.5°C). February sees the highest snowfall, measuring 1.57" (40mm). The decrease in daylight hours to just under 10 hours in December is another distinctive characteristic of winter in Knoxville.Weather in January
Ever-climbing pressure trends distinguish Knoxville weather for January. Temperatures can be quite chilly in comparison to December, and locals feel the bite of winter with the lowest average temperatures of the year being 29.3°F (-1.5°C). Weather in January »Weather in February
Knoxville's transition from January to February is marked by rising temperature trends. February experiences an increased average temperature of 49.6°F (9.8°C), with superficial snowfall of only 1.57" (40mm), offering indications of an imminent spring. Weather in February »Weather in March
Knoxville weather in March sees a significant move towards spring. Compared to February, temperatures continue their upward trajectory, and snowfall becomes a rare occurrence, making way for rainfall instead. March signals the retreat of winter and the onset of spring, with increased daylight hours. Weather in March »Weather in April
By the time April rolls around, winter is a distant memory in Knoxville. The month exhibits considerably warmer temperatures than March, with average high temperatures surpassing the 69.3°F (20.7°C) mark, indicating definite springtime warmth. Weather in April »Weather in May
May's arrival in Knoxville signifies the unofficial start of summer in the city. A shift is noticeable from April, with the mercury often climbing to an average high of 78.4°F (25.8°C). None of the months prior experience such a jump in maximum temperature, confirming May as the year's first genuinely hot month. Weather in May »Weather in June
Knoxville embraces early summer with open arms in June. An upward trend from May, summer heat averages 86°F (30°C) high and signals beach season. The city's rainfall remains constant and manageable, ensuring summer plans remain intact. Weather in June »Weather in July
The potency of Knoxville’s summer peaks in July. With the month’s average high temperatures topping at 88.9°F (31.6°C), it distinguishes itself as the hottest month of the year. A consistent UV index of 6 is expected, as is typical of this season, necessitating sun protection always. Weather in July »Weather in August
Heatwaves start to subside, as Knoxville's August weather sees a slight dip in temperature compared to July. The transition month from peak summer to early fall is marked by hot but bearable climates. Though rainfall is at annual low, the decreased humidity ensures an enjoyable outdoor setting. Weather in August »Weather in September
September in Knoxville welcomes fall with open arms, marking a significant drop in temperatures compared to August. Though there is an increase in rainfall, it is the month with the least rainfall overall, averaging just 1.5" (38mm). Weather in September »Weather in October
Knoxville in October epitomises the full swing of fall. October weather sees cooler temperatures, a noticeable change from the warmth of September. It reveals gradual signs of winter with a significant decrease in daylight hours. Weather in October »Weather in November
November in Knoxville is the stepping stone to winter, with the cold taking hold of the city. With a notable decline in temperatures from October, high averages settle at 57.2°F (14°C). Winter's icy grip begins its introduction, yet without any significant snowfall. Weather in November »Weather in December
Knoxville embraces winter in its full form by December. Following November, the temperature continues its downward trend to solidify December as a distinctively frigid month. With an average high of 49.1°F (9.5°C), it announces winter's arrival definitively. Weather in December »Updated: Jun 19, 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
January, noted for its average high-temperature of 44.8°F (7.1°C) and an average low-temperature of 29.3°F (-1.5°C), is considered the coldest month.
Throughout the year, there are 148.9 rainfall days, and 29.57" (751mm) of precipitation is accumulated.
Months with snowfall are January through April, November and December.
In Knoxville, during the entire year, snow falls for 11.5 days and aggregates up to 3.94" (100mm) of snow.
With an average of 4.9h of sunshine, January has the least sunshine of the year in Knoxville.
January, February and December, with an average maximum UV index of 2, are months with the lowest UV index.
February and December, with an average relative humidity of 78%, are most humid months.
The month with the most rainfall is February, when the rain falls for 11.2 days and typically aggregates up to 3.66" (93mm) of precipitation.
February is the month with the most snowfall in Knoxville. Snow falls for 3.3 days and accumulates 1.57" (40mm) of snow.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, 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 in Knoxville.
May through August, with an average maximum UV index of 6, are months with the highest UV index.
June has the longest days of the year in Knoxville, with an average of 14h and 36min of daylight.
With an average of 10.6h of sunshine, June has the most sunshine of the year.
July brings the highest temperatures, with an average high of 88.9°F (31.6°C) and an average low of 66.7°F (19.3°C).
August is the least humid month, with an average relative humidity of 70%.
September is the month with the least rainfall. Rain falls for 11.3 days and accumulates 1.5" (38mm) of precipitation.
The month with the shortest days is December, with an average of 9h and 48min of daylight.
Average temperature
Knoxville, TN
The warmest month (with the highest average high temperature) is July (88.9°F).
The month with the lowest average high temperature is January (44.8°F).
The month with the highest average low temperature is July (66.7°F).
The coldest month (with the lowest average low temperature) is January (29.3°F).
Average pressure
Knoxville, 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:
30.04"Hg - Average pressure in October:
30.06"Hg - Average pressure in November:
30.16"Hg - Average pressure in December:
30.14"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
Knoxville, TN
- Average wind speed in January:
5.5mph - Average wind speed in February:
5.8mph - Average wind speed in March:
5.7mph - Average wind speed in April:
6mph - Average wind speed in May:
4.9mph - Average wind speed in June:
4.5mph
- Average wind speed in July:
4mph - Average wind speed in August:
3.8mph - Average wind speed in September:
4mph - Average wind speed in October:
4.7mph - Average wind speed in November:
4.7mph - Average wind speed in December:
5.2mph
The windiest month (with the highest average wind speed) is April (6mph).
The calmest month (with the lowest average wind speed) is August (3.8mph).
Average humidity
Knoxville, TN
The months with the highest relative humidity are February and December (78%).
The month with the lowest relative humidity is August (70%).
Average rainfall
Knoxville, TN
- Average rainfall in January:
2.48" - Average rainfall in February:
3.66" - Average rainfall in March:
2.52" - Average rainfall in April:
2.8" - Average rainfall in May:
2.13" - Average rainfall in June:
2.44"
- Average rainfall in July:
2.76" - Average rainfall in August:
2.01" - Average rainfall in September:
1.5" - Average rainfall in October:
2.09" - Average rainfall in November:
2.13" - Average rainfall in December:
3.07"
The wettest month (with the highest rainfall) is February (3.66").
The driest month (with the least rainfall) is September (1.5").
Average rainfall days
Knoxville, TN
- Average rainfall days in January:
10.9 days - Average rainfall days in February:
11.2 days - Average rainfall days in March:
14.1 days - Average rainfall days in April:
13.8 days - Average rainfall days in May:
14.9 days - Average rainfall days in June:
12.8 days
- Average rainfall days in July:
16.2 days - Average rainfall days in August:
14.3 days - Average rainfall days in September:
11.3 days - Average rainfall days in October:
8.8 days - Average rainfall days in November:
8.4 days - Average rainfall days in December:
12.2 days
The month with the highest number of rainy days is July (16.2 days).
The month with the least rainy days is November (8.4 days).
Average snowfall
Knoxville, TN
The month with the highest snowfall is February (1.57").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days
Knoxville, TN
- Average snowfall days in January:
3.8 days - Average snowfall days in February:
3.3 days - Average snowfall days in March:
1.7 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 days - Average snowfall days in November:
0.7 days - Average snowfall days in December:
1.7 days
The month with the highest number of snowfall days is January (3.8 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight / Average sunshine
Knoxville, TN
- Average daylight in January:
10h and 0min - 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 36min
- 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 36min).
The month with the shortest days is December (Average daylight: 9h and 48min).
- Average sunshine in January:
4h and 54min - Average sunshine in February:
5h and 42min - Average sunshine in March:
6h and 30min - Average sunshine in April:
8h and 18min - Average sunshine in May:
9h and 54min - Average sunshine in June:
10h and 36min
- Average sunshine in July:
10h and 24min - Average sunshine in August:
9h and 54min - Average sunshine in September:
8h and 36min - Average sunshine in October:
7h and 0min - Average sunshine in November:
5h and 54min - Average sunshine in December:
5h and 0min
The month with the most sunshine is June (Average sunshine: 10h and 36min).
The month with the least sunshine is January (Average sunshine: 4h and 54min).
Average sunshine days
Knoxville, TN
- Average sunshine days in January:
17 days - Average sunshine days in February:
14.1 days - Average sunshine days in March:
14 days - Average sunshine days in April:
14.3 days - Average sunshine days in May:
13.8 days - Average sunshine days in June:
14.2 days
- Average sunshine days in July:
12.9 days - Average sunshine days in August:
14.6 days - Average sunshine days in September:
17.4 days - Average sunshine days in October:
20.5 days - Average sunshine days in November:
20 days - Average sunshine days in December:
17 days
The month with the most sunshine days is October (20.5 days).
The month with the least sunshine days is July (12.9 days).
Average UV index
Knoxville, 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
Knoxville, TN
The month with the most cloud cover is February (Cloud cover 54).
The month with the least cloud cover is June (Cloud cover 28).
Average visibility
Knoxville, TN
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).
