Climate and monthly weather forecastJohnson City, TN
Climate and monthly weather forecast
The climate of Johnson City
Johnson City, in Tennessee, USA, is characterized by a climate that falls into the Köppen climate classification Cfb, indicative of a Marine West Coast, warm summer climatic zone. Spread across a yearly cycle, weather parameters document considerable fluctuations.Temperature recordings illustrate that highs in Johnson City fluctuate from a low 41.5°F (5.3°C) in January to a peak 83.3°F (28.5°C) in July. Simultaneously, the least temperatures likewise show a pronounced upward movement from 26.6°F (-3°C) in January to 60.6°F (15.9°C) by July. Likewise, relative humidity ranges between 75% to 79%, with minor differences throughout the year.
The pattern of precipitation shows a spread between 2.28" (58mm) and 3.27" (83mm) per month, with the added combination of both rain and snowfall. The city experiences the lightest rainfall, 1.77" (45mm), in September, while February receives the highest, 3.27" (83mm). The number of rainfall days throughout the year ranges from 11.2 to 19.6 days per month.
Interestingly, the period from January to April sees some snowfall, with the highest amount, 3.74" (95mm), occurring in December and the lightest, 0.24" (6mm), falling in April. Snowfall days record between 0 to 8.9 days per year.
The best time to visit Johnson City
Taking into account the various climatic factors for comfort, such as temperature, humidity, and rainfall, mid-May to mid-September appear to be the most pleasant months in Johnson City. During this period, citizens and travelers can enjoy temperatures averaging between 73.4°F (23°C) to 82.6°F (28.1°C) degrees, while humidity hovers from 76% to 78%. Additionally, rainfall drops beneath 3" (76mm) during these months.The worst time to visit Johnson City
Conversely, January and December are deemed as the most challenging months to visit Johnson City. During these months, temperatures slide between 26.6°F (-3°C) to 41.5°F (5.3°C) in January and slightly increase to range from 32.4°F (0.2°C) to 46.6°F (8.1°C) by December. Moreover, these months also experience increased rainfall, measuring over 3" (76mm), accompanied by the highest instances of snowfall and relatively high humidity levels.Spring weather in Johnson City
In Johnson City, Spring transitions begin from March and continue till May end. Temperature rises during this season, reporting between 36.3°F (2.4°C) to 64.9°F (18.3°C), with May experiencing the highest temperatures. March welcomes approximately 2.6" (66mm) of rainfall on an average of 17.2 days, dropping minimally to approximately 3.15" (80mm) over 16.8 days by April end.Summer weather in Johnson City
Summer, starting from June and ending in August, is relatively dry and warmer. Temperatures climb from 57.4°F (14.1°C) to an average high of 82.6°F (28.1°C). July sees the highest temperature instance at 83.3°F (28.5°C). Rainfall records around 3" (76mm) over 17.4 to 19.6 days.Autumn weather in Johnson City
Autumn, from September to November, witnesses a dip in temperatures and a variation in precipitation patterns. While temperatures drop from 77.5°F (25.3°C) in September to 54.5°F (12.5°C) by November, rainfall mark a rise from 1.77" (45mm) to 2.28" (58mm) on average during the season.Winter weather in Johnson City
The winter months from December to February in Johnson City are characterized by below freezing temperatures and increased precipitation. The coldest month, January, displays temperature readings between 26.6°F (-3°C) to 41.5°F (5.3°C). Winter precipitation emerges in the form of both rain and snow. Snowfall records peak to 3.39" (86mm) in December, accompany an average of 3.07" (78mm) of rainfall over the season. Snowy days number from 6.2 to 8.9 days during winter.Weather in January
Johnson City experiences a frosty start to the year, with temperatures typically dropping to 26.6°F (-3°C). The city frequently sees snowfall during January, with the grounds often adorned in a beautiful white blanket. Weather fluctuations are expected, so it’s advisable to keep warm clothing at hand. Weather in January »Weather in February
As the city transitions from January to February, the weather begins to slowly thaw out, paving the way for an increase in temperature. Notable elements of February include an average relative humidity reaching 79% and temperatures rising to a mild 46.4°F (8°C). Weather in February »Weather in March
With spring on the horizon, Johnson City sees a substantial change in weather from February to March. Warmer days feature radiant sunshine, perfect for outdoor activities and sightseeing. Humidity levels and temperature undergo slight increments, indicative of the seasonal transition. Weather in March »Weather in April
In April, Johnson City undergoes a significant weather shift as flowers bloom and wildlife becomes more active. This period marks an imminent end to frosty temperatures, with the city transitioning swiftly into warmer climes. As the mercury soars towards 64.9°F (18.3°C), residents swap their winter attire for lighter clothing. Weather in April »Weather in May
May observes Johnson City immersed in the vibrant energy of spring, with the surroundings teeming with life and color. The city observes a steady increase in temperature and humidity, reinforcing the presence of the spring season. Rainfall events are frequent, resulting in fresh and lush foliage, painting the town in varying shades of green. Weather in May »Weather in June
In Johnson City, June espouses the arrival of summer with temperatures transcending to a comfortable 80.2°F (26.8°C). The city illuminates under the sun for an average duration of 14.6 hours, maximizing daylight utilization for outdoor activities. Weather in June »Weather in July
July marks the zenith of summer in Johnson City, with temperatures reaching their peak at 83.3°F (28.5°C). Extended daylight hours afford plenty of opportunities for enjoying outdoor activities and exploring the city’s attractions. Weather in July »Weather in August
Despite the slight dip in temperature from July to August, Johnson City continues to exude summer warmth. Infrequent showers intersperse the warm days, offering momentary coolness to residents and visitors. The flexing strength of the sun creates dazzling outdoor scenery, inviting exploration and enjoyment. Weather in August »Weather in September
September serves as a bridge between the sultry summer and the crisp autumn in Johnson City. The distinctive onset of cooler temperatures and shorter days earmarks the change of season. While nestled in the quintessential charm of summer, the city begins to showcase colorful leaves and cooler evenings. Weather in September »Weather in October
Come October, Johnson City embraces the heart of autumn with a downshift in temperature and a burst of colorful foliage. Temperature changes establish the arrival of brisk weather, suggestive of the impending winter season. The wind gathers momentum, whipping up crisp leaves and heralding the change in season. Weather in October »Weather in November
In November, Johnson City's transformation from autumn to winter becomes more palpable. Certain days register lower temperatures, particularly after dusk, indicating the encroaching winter. The city retains a sense of calm and tranquility, with locals and visitors enjoying the late autumn scenery. Weather in November »Weather in December
The year concludes with December encompassing typical winter features in Johnson City. The chill in the air gets more prevalent, marking the establishment of winter in earnest. The city witnesses a dramatic increase in snowfall to 3.74" (95mm), casting the landscape in mystical winter white. Weather in December »Updated: Jul 8, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
January, having an average high-temperature of 41.5°F (5.3°C) and an average low-temperature of 26.6°F (-3°C), is the coldest month.
In Johnson City, during the entire year, the rain falls for 187.8 days and collects up to 32.76" (832mm) of precipitation.
January through April, October through December are months with snowfall in Johnson City.
Throughout the year, there are 32.1 snowfall days, and 13.31" (338mm) of snow is accumulated.
January has the least sunshine of the year, with an average of 5h of sunshine.
The months with the lowest UV index are January, February and December, with an average maximum UV index of 2.
February and December, with an average relative humidity of 79%, are most humid months.
February is the month with the most rainfall. Rain falls for 13.6 days and accumulates 3.27" (83mm) of precipitation.
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 Johnson City, snow does not fall in May through September.
The month with the longest days is June, 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.
The months with the highest UV index are June through August, with an average maximum UV index of 6.
July is the month when Johnson City experiences its warmest temperatures, averaging a high of 83.3°F (28.5°C) and a low of 60.6°F (15.9°C).
September is the month with the least rainfall. Rain falls for 15.5 days and accumulates 1.77" (45mm) of precipitation.
November is the least humid month, with an average relative humidity of 75%.
The month with the most snowfall is December, when snow falls for 6.2 days and typically aggregates up to 3.74" (95mm) of snow.
The month with the shortest days is December, with an average of 9h and 42min of daylight.
Average temperature
Johnson City, TN
The warmest month (with the highest average high temperature) is July (83.3°F).
The month with the lowest average high temperature is January (41.5°F).
The month with the highest average low temperature is July (60.6°F).
The coldest month (with the lowest average low temperature) is January (26.6°F).
Average pressure
Johnson City, TN
- Average pressure in January:
30.15"Hg - Average pressure in February:
30.11"Hg - Average pressure in March:
30.1"Hg - Average pressure in April:
30.01"Hg - Average pressure in May:
30.03"Hg - Average pressure in June:
29.99"Hg
- Average pressure in July:
30.02"Hg - Average pressure in August:
30.03"Hg - Average pressure in September:
30.06"Hg - Average pressure in October:
30.06"Hg - Average pressure in November:
30.16"Hg - Average pressure in December:
30.14"Hg
The month with the highest atmospheric pressure is November (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.99"Hg).
Average wind speed
Johnson City, TN
- Average wind speed in January:
6.4mph - Average wind speed in February:
6.4mph - Average wind speed in March:
6.3mph - Average wind speed in April:
6.6mph - Average wind speed in May:
5.2mph - Average wind speed in June:
4.4mph
- Average wind speed in July:
4mph - Average wind speed in August:
3.7mph - Average wind speed in September:
4mph - Average wind speed in October:
4.9mph - Average wind speed in November:
5.1mph - Average wind speed in December:
5.8mph
The windiest month (with the highest average wind speed) is April (6.6mph).
The calmest month (with the lowest average wind speed) is August (3.7mph).
Average humidity
Johnson City, TN
The months with the highest relative humidity are February and December (79%).
The month with the lowest relative humidity is November (75%).
Average rainfall
Johnson City, TN
- Average rainfall in January:
2.6" - Average rainfall in February:
3.27" - Average rainfall in March:
2.6" - Average rainfall in April:
3.15" - Average rainfall in May:
3.07" - Average rainfall in June:
2.76"
- Average rainfall in July:
3.11" - Average rainfall in August:
2.64" - Average rainfall in September:
1.77" - Average rainfall in October:
2.44" - Average rainfall in November:
2.28" - Average rainfall in December:
3.07"
The wettest month (with the highest rainfall) is February (3.27").
The driest month (with the least rainfall) is September (1.77").
Average rainfall days
Johnson City, TN
- Average rainfall days in January:
13.8 days - Average rainfall days in February:
13.6 days - Average rainfall days in March:
17.2 days - Average rainfall days in April:
16.8 days - Average rainfall days in May:
19.4 days - Average rainfall days in June:
17.4 days
- Average rainfall days in July:
19.6 days - Average rainfall days in August:
17.7 days - Average rainfall days in September:
15.5 days - Average rainfall days in October:
12 days - Average rainfall days in November:
11.2 days - Average rainfall days in December:
13.6 days
The month with the highest number of rainy days is July (19.6 days).
The month with the least rainy days is November (11.2 days).
Average snowfall
Johnson City, TN
The month with the highest snowfall is December (3.74").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days
Johnson City, TN
- Average snowfall days in January:
8.9 days - Average snowfall days in February:
8.3 days - Average snowfall days in March:
4.3 days - Average snowfall days in April:
1 days - Average snowfall days in May:
0.1 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:
0.7 days - Average snowfall days in November:
2.6 days - Average snowfall days in December:
6.2 days
The month with the highest number of snowfall days is January (8.9 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight / Average sunshine
Johnson City, 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 12min - Average daylight in December:
9h and 42min
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 42min).
- Average sunshine in January:
5h and 0min - Average sunshine in February:
5h and 54min - Average sunshine in March:
7h and 0min - Average sunshine in April:
8h and 48min - 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:
10h and 30min - Average sunshine in September:
8h and 42min - Average sunshine in October:
6h and 48min - Average sunshine in November:
6h and 6min - Average sunshine in December:
5h and 30min
The month with the most sunshine is June (Average sunshine: 10h and 36min).
The month with the least sunshine is January (Average sunshine: 5h and 0min).
Average sunshine days
Johnson City, TN
- Average sunshine days in January:
11.1 days - Average sunshine days in February:
9 days - Average sunshine days in March:
10.3 days - Average sunshine days in April:
11.8 days - Average sunshine days in May:
9.2 days - Average sunshine days in June:
10.3 days
- Average sunshine days in July:
8.3 days - Average sunshine days in August:
9.8 days - Average sunshine days in September:
11.9 days - Average sunshine days in October:
16.5 days - Average sunshine days in November:
15.7 days - Average sunshine days in December:
13.2 days
The month with the most sunshine days is October (16.5 days).
The month with the least sunshine days is July (8.3 days).
Average UV index
Johnson City, TN
The months with the highest UV index are 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
Johnson City, TN
The month with the most cloud cover is February (Cloud cover 52).
The months with the least cloud cover are June and August (Cloud cover 31).
Average visibility
Johnson City, TN
The months with the highest visibility are April, June, July, October and November (6mi).
The months with the lowest visibility are January, February, March, May, August, September and December (5mi).
