Climate and monthly weather forecastChattanooga, TN
Climate and monthly weather forecast
The climate of Chattanooga
Chattanooga, a city treasured within the borders of the southeastern part of the United States, Tennessee, enjoys a uniform climate throughout the year. According to the Köppen Climate Classification, Chattanooga experiences a Cfa climate type, known as the Humid Subtropical type with no dry season.A detailed review of the climatological dataset reveals a considerable variability in temperature across the year. The highest temperature is observed in July averaging around 88°F (31.1°C), while the chilliest period is January, recording an average temperature low of 30.7°F (-0.7°C). The relative humidity ranges from 75% to 80%, demonstrating a consistent humid atmosphere, reflecting the city's subtropical nature.
Rainfall is well dispersed throughout the year with the maximum recorded rainfall of 4.09" (104mm) in February and the minimum of 2.56" (65mm) in September. It unveils a dominant feature of Chattanooga's weather: there is no distinct dry season. A parallel examination of the snowfall displays scarce occurrences, primarily limited to the winter months. The daylight hours vary between a low of 9.8 hours in December and a high of 14.5 hours in June, parallel with the Summer Solstice.
The Best Time to Visit Chattanooga
Swing season periods, namely late spring and early autumn present an optimal combination of adequate temperature, sunlight, and lower rainfall for travelling. From April to June, the temperature scales between 59.4°F (15.2°C) and 85.6°F (29.8°C) and rainfall measurements stay moderately low providing perfect conditions for outdoor activities. Furthermore, between September to November, with temperatures reducing from 81.9°F (27.7°C) to 57.6°F (14.2°C), and daylight lingering between 10.3 to 12.4 hours, Chattanooga displays its much-admired fall foliage, making it a visually spectacular time to visit.The Worst Time to Visit Chattanooga
The most inhospitable weather in Chattanooga occurs during the summer months from June to August. The highest temperatures reaching up to 88°F (31.1°C) along with a relative humidity of around 75% may result in a stifling, oppressive atmosphere which is typically uncomfortable, particularly for those unaccustomed to the subtropical climate. Rainfall is relatively high, and coupled with high UV Index, makes these summer months less desirable for travel.Spring Weather in Chattanooga
Spring in Chattanooga, from March to May, brings average temperatures warming up gradually from 41.9°F (5.5°C) to 64°F (17.8°C). A remarkable feature observed in these months is the increase in daylight, from 12 hours in March to 14 hours in May. The city, despite experiencing some rainfall between 3.82" (97mm) to 3.43" (87mm), remains pleasantly fresh, making this season an incredible time to explore the city's natural beauty.Summer Weather in Chattanooga
The summer months in Chattanooga, from June to August manifest high temperatures, peaking at around 88°F (31.1°C) in July. Amidst the intense heat, the city receives moderate rainfall between 2.72" (69mm) and 3.94" (100mm). Despite the hot conditions, the amount of daylight received stands maximized at approximately 14.5 hours in the month of June, almost introducing a sense of eternal daytime in the town.Autumn Weather in Chattanooga
Autumn, from September to November, is a period when temperature begins to mellow down from 81.9°F (27.7°C) to 57.6°F (14.2°C) in Chattanooga. This period is marked by lesser rainfall (ranging from 2.80 to 2.72" (69mm)) and receding daylight hours from 12.4 hours to 10.3 hours. This gradual transition towards colder climate and beautiful fall foliage presents an inviting visual treat in Chattanooga.Winter Weather in Chattanooga
Winter, spanning from December to February sees a significant decline in temperatures in Chattanooga, with the coldest month, January, recording lows of 30.7°F (-0.7°C). Snowfall during these period is sparse, yet adds a unique charm to the landscape. Visibility and wind parameters indicate a rather calm weather. With daylight hours around 9.8 hours to 11 hours and relative humidity floating around 78% to 80%, this season bestows an overall calm and peaceful atmosphere.Weather in January
In Chattanooga, Tennessee, the first month of the year is marked by crisp and cold weather conditions, swinging from a low of 30.7°F (-0.7°C) to a high of 46°F (7.8°C). A notable highlight of this month is the relatively high humidity level, contributing to the chilly feel. Weather in January »Weather in February
February's weather pattern tends to show a steady increase in temperature compared to January. While February may not carry the distinct chill of January, it brings a higher rainfall of 4.09" (104mm) coupled with an increase in humidity. Weather in February »Weather in March
The essence of Chattanooga weather in March lies in its transitional nature, as the climate shifts from the final traces of winter towards the early stages of spring. It begins to warm up slightly in this month, with the cold winter air slowly being replaced by a gentler spring breeze. Weather in March »Weather in April
April weather in Chattanooga takes a decisive shift from the previous transitional weather patterns to a fully-fledged spring climate. The increasing hours of daylight, from 13.1 hours, contribute to the gentle warmth that paints the weather outlook for this month. Weather in April »Weather in May
In Chattanooga, May is characterized by welcoming weather with an increase in temperature, promoting outdoor activities. The city basks under the sun for a longer time, alluding to the nearing summer season. With the highest temperature averaging at 78.1°F (25.6°C) and the lowest at 57.2°F (14°C), the climate leans more towards the warmer side compared to the other months of the year, setting the catalogue for June's higher temperatures. Chattanooga's transition into May sees a mild rise in the average high-temperature, edging from a pleasant 69.4°F (20.8°C) in April to a moderately hot 78.1°F (25.6°C). Weather in May »Weather in June
June highlights the transition into Chattanooga’s summer, with noticeably longer daylight hours and warmer temperatures. In addition to the warmer weather, the sunny conditions, with an extended 14.5 hours of daylight, make June one of the most favored months for outdoor activities. Weather in June »Weather in July
Marked by the highest temperatures of the year, with averages between 67.1°F (19.5°C) and 88°F (31.1°C), July represents the peak of summer in Chattanooga. The warm weather is accompanied by an increase in humidity, enveloping the city in a classic summer atmosphere. Weather in July »Weather in August
In Chattanooga, August continues with the established summer weather pattern. Despite slight dips in temperature compared to July, the city still experiences warm and sunny days. Despite the persistent summer heat, rainfall increases to reach 3.31" (84mm). Weather in August »Weather in September
September marks the transition from summer to fall in Chattanooga. Although it entails a considerable decrease from the summer highs, September’s temperatures remain warm, providing ideal conditions for outdoor pursuits. The reduced rainfall in this month, which is 2.56" (65mm), is balanced out by comfortable weather conditions. Weather in September »Weather in October
The nature of Chattanooga's October weather is defined by its fall atmosphere, characterized by a marked decrease in temperatures. The cooler climatic conditions provide relief from the previously high temperatures. Bright, clear skies marked by fewer clouds, paired with the changing foliage, make this month particularly picturesque. Weather in October »Weather in November
November in Chattanooga sees the onset of colder weather conditions with temperatures ranging between 40.1°F (4.5°C) and 57.6°F (14.2°C). The gentle climate of early November gradually gives way to the approaching winter characterised by shorter days and less sunshine. Weather in November »Weather in December
The last month of the year, December, is marked by a significant shift towards winter. Low temperatures, coupled with the return of snowfall, averaging 0.59" (15mm), marks December as the coldest month in Chattanooga. Despite the chill, the abundance of festive events makes this a vibrant time to visit the city. Weather in December »Updated: Aug 27, 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
In Chattanooga, January records the average lowest temperatures, peaking at 46°F (7.8°C) and reaching a low of 30.7°F (-0.7°C).
In Chattanooga, during the entire year, the rain falls for 174.4 days and collects up to 41.14" (1045mm) of precipitation.
Months with snowfall are January through April, November and December.
Throughout the year, there are 13.2 snowfall days, and 4.17" (106mm) of snow is accumulated.
The months with the lowest UV index are January and December, with an average maximum UV index of 2.
February is the month with the most snowfall. Snow falls for 3.8 days and accumulates 1.85" (47mm) 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.
In Chattanooga, snow does not fall in May through October.
The months with the highest UV index are May through August, with an average maximum UV index of 6.
June through August, October and November, with an average relative humidity of 75%, are the least humid months.
June has the longest days of the year, with an average of 14h and 30min of daylight.
June has the most sunshine of the year, with an average of 10.3h of sunshine.
July, having an average high-temperature of 88°F (31.1°C) and an average low-temperature of 67.1°F (19.5°C), is the warmest month.
The month with the least rainfall is September, when the rain falls for 12.5 days and typically collects 2.56" (65mm) of precipitation.
December is the most humid month, with an average relative humidity of 80%.
December is the month with the most rainfall. Rain falls for 13.7 days and accumulates 4.37" (111mm) of precipitation.
With an average of 9h and 48min of daylight, December has the shortest days of the year.
With an average of 4.9h of sunshine, December has the least sunshine of the year.
Average temperature
Chattanooga, TN
The warmest month (with the highest average high temperature) is July (88°F).
The month with the lowest average high temperature is January (46°F).
The month with the highest average low temperature is July (67.1°F).
The coldest month (with the lowest average low temperature) is January (30.7°F).
Average pressure
Chattanooga, TN
- Average pressure in January:
30.17"Hg - Average pressure in February:
30.13"Hg - Average pressure in March:
30.1"Hg - Average pressure in April:
30.01"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"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 month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.98"Hg).
Average wind speed
Chattanooga, TN
- Average wind speed in January:
6.2mph - Average wind speed in February:
6.4mph - Average wind speed in March:
6.3mph - Average wind speed in April:
6.3mph - Average wind speed in May:
5mph - Average wind speed in June:
4.4mph
- Average wind speed in July:
3.9mph - Average wind speed in August:
3.8mph - Average wind speed in September:
4.1mph - Average wind speed in October:
5.1mph - Average wind speed in November:
5.4mph - Average wind speed in December:
5.7mph
The windiest month (with the highest average wind speed) is February (6.4mph).
The calmest month (with the lowest average wind speed) is August (3.8mph).
Average humidity
Chattanooga, TN
The month with the highest relative humidity is December (80%).
The months with the lowest relative humidity are June, July, August, October and November (75%).
Average rainfall
Chattanooga, TN
- Average rainfall in January:
3.62" - Average rainfall in February:
4.09" - Average rainfall in March:
3.82" - Average rainfall in April:
3.78" - Average rainfall in May:
3.43" - Average rainfall in June:
2.72"
- Average rainfall in July:
3.94" - Average rainfall in August:
3.31" - Average rainfall in September:
2.56" - Average rainfall in October:
2.8" - Average rainfall in November:
2.72" - Average rainfall in December:
4.37"
The wettest month (with the highest rainfall) is December (4.37").
The driest month (with the least rainfall) is September (2.56").
Average rainfall days
Chattanooga, TN
- Average rainfall days in January:
13.2 days - Average rainfall days in February:
13.7 days - Average rainfall days in March:
15.8 days - Average rainfall days in April:
14.3 days - Average rainfall days in May:
15.8 days - Average rainfall days in June:
17.8 days
- Average rainfall days in July:
19.6 days - Average rainfall days in August:
17.6 days - Average rainfall days in September:
12.5 days - Average rainfall days in October:
10.6 days - Average rainfall days in November:
9.8 days - Average rainfall days in December:
13.7 days
The month with the highest number of rainy days is July (19.6 days).
The month with the least rainy days is November (9.8 days).
Average snowfall
Chattanooga, TN
The month with the highest snowfall is February (1.85").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days
Chattanooga, TN
- Average snowfall days in January:
4.1 days - Average snowfall days in February:
3.8 days - Average snowfall days in March:
1.8 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:
1 days - Average snowfall days in December:
2.2 days
The month with the highest number of snowfall days is January (4.1 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight / Average sunshine
Chattanooga, 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 0min - Average daylight in June:
14h and 30min
- Average daylight in July:
14h and 12min - Average daylight in August:
13h and 24min - 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 18min - Average sunshine in February:
5h and 54min - Average sunshine in March:
6h and 30min - Average sunshine in April:
8h and 0min - Average sunshine in May:
9h and 24min - Average sunshine in June:
10h and 18min
- Average sunshine in July:
10h and 12min - Average sunshine in August:
9h and 12min - Average sunshine in September:
8h and 18min - Average sunshine in October:
7h and 12min - Average sunshine in November:
5h and 42min - Average sunshine in December:
4h and 54min
The month with the most sunshine is June (Average sunshine: 10h and 18min).
The month with the least sunshine is December (Average sunshine: 4h and 54min).
Average sunshine days
Chattanooga, TN
- Average sunshine days in January:
15.3 days - Average sunshine days in February:
11.6 days - Average sunshine days in March:
12.3 days - Average sunshine days in April:
13.4 days - Average sunshine days in May:
13.3 days - Average sunshine days in June:
10.6 days
- Average sunshine days in July:
9.4 days - Average sunshine days in August:
12.3 days - Average sunshine days in September:
15.9 days - Average sunshine days in October:
18.9 days - Average sunshine days in November:
18.2 days - Average sunshine days in December:
15.1 days
The month with the most sunshine days is October (18.9 days).
The month with the least sunshine days is July (9.4 days).
Average UV index
Chattanooga, 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 and December (UV index 2).
Average cloud cover
Chattanooga, TN
The month with the most cloud cover is February (Cloud cover 52).
The month with the least cloud cover is June (Cloud cover 31).
Average visibility
Chattanooga, TN
The months with the highest visibility are June, October and November (6mi).
The months with the lowest visibility are January, February, March, April, May, July, August, September and December (5mi).
