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Average Weather at Tri-Cities Regional TN/VA Airport Tennessee, United States

At Tri-Cities Regional TN/VA Airport, the summers are long, warm, and humid; the winters are short, very cold, and wet; and it is partly cloudy year round. Over the course of the year, the temperature typically varies from 28°F to 85°F and is rarely below 13°F or above 92°F.

Based on the tourism score, the best times of year to visit Tri-Cities Regional TN/VA Airport for warm-weather activities are from early June to mid July and from mid July to late September.

Climate Summary

coldcoolwarmwarmcoolcoldJanFebMarAprMayJunJulAugSepOctNovDecNowNow66%66%42%42%clearovercastprecipitation: 3.5 inprecipitation: 3.5 in2.3 in2.3 inmuggy: 63%muggy: 63%0%0%drydrytourism score: 6.6tourism score: 6.60.40.4
Click on each chart for more information.

Temperature

The hot season lasts for 4.0 months, from May 22 to September 20, with an average daily high temperature above 77°F. The hottest day of the year is July 20, with an average high of 85°F and low of 66°F.

The cold season lasts for 2.9 months, from November 30 to February 26, with an average daily high temperature below 53°F. The coldest day of the year is January 25, with an average low of 28°F and high of 46°F.

Average High and Low Temperature

Average High and Low Temperature at Tri-Cities Regional TN/VA AirporthotcoldcoldJanFebMarAprMayJunJulAugSepOctNovDec0°F10°F20°F30°F40°F50°F60°F70°F80°F90°F100°FJan 2546°FJan 2546°FJul 2085°FJul 2085°F28°F28°F66°F66°FMay 2277°FMay 2277°FSep 2077°FSep 2077°FNov 3053°FNov 3053°F55°F55°F56°F56°F34°F34°F33°F33°FLowHighNowNow
The daily average high (red line) and low (blue line) temperature, with 25th to 75th and 10th to 90th percentile bands. The thin dotted lines are the corresponding average perceived temperatures.

The figure below shows you a compact characterization of the entire year of hourly average temperatures. The horizontal axis is the day of the year, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.

Average Hourly Temperature

Average Hourly Temperature at Tri-Cities Regional TN/VA AirportJanFebMarAprMayJunJulAugSepOctNovDec12 AM4 AM8 AM12 PM4 PM8 PM12 AMNowNowfreezingvery coldvery coldcoldcoldcoolcoolcomfortablewarm
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The average hourly temperature, color coded into bands. The shaded overlays indicate night and civil twilight.

Castelfranco Veneto, Italy (4,668 miles away) is the far-away foreign place with temperatures most similar to Tri-Cities Regional TN/VA Airport (view comparison).

Clouds

At Tri-Cities Regional TN/VA Airport, the average percentage of the sky covered by clouds experiences significant seasonal variation over the course of the year.

The clearer part of the year at Tri-Cities Regional TN/VA Airport begins around July 3 and lasts for 4.5 months, ending around November 18. On September 20, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 66% of the time, and overcast or mostly cloudy 34% of the time.

The cloudier part of the year begins around November 18 and lasts for 7.5 months, ending around July 3. On January 4, the cloudiest day of the year, the sky is overcast or mostly cloudy 58% of the time, and clear, mostly clear, or partly cloudy 42% of the time.

Cloud Cover Categories

Cloud Cover Categories at Tri-Cities Regional TN/VA AirportclearercloudiercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Sep 2066%Sep 2066%Jan 442%Jan 442%Jul 354%Jul 354%Nov 1854%Nov 1854%NowNowclearmostly clearpartly cloudymostly cloudyovercast
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds.

Precipitation

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days at Tri-Cities Regional TN/VA Airport varies throughout the year.

The wetter season lasts 3.9 months, from April 27 to August 23, with a greater than 34% chance of a given day being a wet day. The chance of a wet day peaks at 46% on July 14.

The drier season lasts 8.1 months, from August 23 to April 27. The smallest chance of a wet day is 22% on October 29.

Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 46% on July 14.

Daily Chance of Precipitation

Daily Chance of Precipitation at Tri-Cities Regional TN/VA AirportwetdrydryJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Jul 1446%Jul 1446%Oct 2922%Oct 2922%Apr 2734%Apr 2734%Aug 2334%Aug 2334%NowNowrainsnow
The percentage of days in which various types of precipitation are observed, excluding trace quantities: rain alone, snow alone, and mixed (both rain and snow fell in the same day).

Rainfall

To show variation within the months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day of the year. Tri-Cities Regional TN/VA Airport experiences some seasonal variation in monthly rainfall.

Rain falls throughout the year at Tri-Cities Regional TN/VA Airport. The most rain falls during the 31 days centered around July 11, with an average total accumulation of 3.5 inches.

The least rain falls around October 21, with an average total accumulation of 2.3 inches.

Average Monthly Rainfall

The average rainfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average liquid-equivalent snowfall.

Snowfall

The sliding 31-day liquid-equivalent quantity of snowfall at Tri-Cities Regional TN/VA Airport does not vary significantly over the course of the year, staying within 0.1 inches of 0.1 inches throughout.

Average Liquid-Equivalent Monthly Snowfall

Average Liquid-Equivalent Monthly Snowfall at Tri-Cities Regional TN/VA AirportsnowJanFebMarAprMayJunJulAugSepOctNovDec0.0 in0.5 in1.0 in1.5 in2.0 in2.5 in3.0 in3.5 inJan 300.2 inJan 300.2 inJul 290.0 inJul 290.0 inDec 120.1 inDec 120.1 inMar 20.1 inMar 20.1 inNowNow
The average liquid-equivalent snowfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average rainfall.

Sun

The length of the day at Tri-Cities Regional TN/VA Airport varies significantly over the course of the year. In 2020, the shortest day is December 21, with 9 hours, 40 minutes of daylight; the longest day is June 20, with 14 hours, 39 minutes of daylight.

Hours of Daylight and Twilight

Hours of Daylight and Twilight at Tri-Cities Regional TN/VA AirportJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 7 minMar 1912 hr, 7 minMar 1914 hr, 39 minJun 2014 hr, 39 minJun 2012 hr, 10 minSep 2212 hr, 10 minSep 229 hr, 40 minDec 219 hr, 40 minDec 21nightnightday
The number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.

The earliest sunrise is at 6:10 AM on June 12, and the latest sunrise is 1 hour, 42 minutes later at 7:52 AM on October 31. The earliest sunset is at 5:13 PM on December 6, and the latest sunset is 3 hours, 38 minutes later at 8:51 PM on June 28.

Daylight saving time (DST) is observed at Tri-Cities Regional TN/VA Airport during 2020, starting in the spring on March 8, lasting 7.8 months, and ending in the fall on November 1.

Sunrise & Sunset with Twilight and Daylight Saving Time

Sunrise & Sunset with Twilight and Daylight Saving Time at Tri-Cities Regional TN/VA AirportJanFebMarAprMayJunJulAugSepOctNovDec2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 126:10 AMJun 126:10 AM8:51 PMJun 288:51 PMJun 28Dec 65:13 PMDec 65:13 PM7:52 AMOct 317:52 AMOct 31Mar 8DSTMar 8DSTDSTNov 1DSTNov 1daynightnightnightnightSolarMidnightSolarMidnightSolarNoonSunriseSunsetNowNow
The solar day over the course of the year 2020. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray. The transitions to and from daylight saving time are indicated by the 'DST' labels.

Humidity

We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.

Tri-Cities Regional TN/VA Airport experiences extreme seasonal variation in the perceived humidity.

The muggier period of the year lasts for 3.6 months, from May 31 to September 16, during which time the comfort level is muggy, oppressive, or miserable at least 16% of the time. The muggiest day of the year is July 24, with muggy conditions 63% of the time.

The least muggy day of the year is December 11, when muggy conditions are essentially unheard of.

Humidity Comfort Levels

Humidity Comfort Levels at Tri-Cities Regional TN/VA AirportmuggyJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Dec 110%Dec 110%Jul 2463%Jul 2463%May 3116%May 3116%Sep 1616%Sep 1616%NowNowmuggymuggydrydryhumidhumidoppressiveoppressivecomfortablecomfortable
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The percentage of time spent at various humidity comfort levels, categorized by dew point.

Wind

This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.

The average hourly wind speed at Tri-Cities Regional TN/VA Airport experiences significant seasonal variation over the course of the year.

The windier part of the year lasts for 6.1 months, from November 4 to May 8, with average wind speeds of more than 5.6 miles per hour. The windiest day of the year is February 26, with an average hourly wind speed of 7.3 miles per hour.

The calmer time of year lasts for 5.9 months, from May 8 to November 4. The calmest day of the year is July 31, with an average hourly wind speed of 4.0 miles per hour.

Average Wind Speed

Average Wind Speed at Tri-Cities Regional TN/VA AirportwindywindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph2 mph4 mph6 mph8 mph10 mph12 mphFeb 267.3 mphFeb 267.3 mphJul 314.0 mphJul 314.0 mphNov 45.6 mphNov 45.6 mphMay 85.6 mphMay 85.6 mphNowNow
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The predominant average hourly wind direction at Tri-Cities Regional TN/VA Airport varies throughout the year.

The wind is most often from the south for 3.9 months, from August 18 to December 14, with a peak percentage of 39% on November 28. The wind is most often from the west for 8.1 months, from December 14 to August 18, with a peak percentage of 40% on January 1.

Wind Direction

Wind Direction at Tri-Cities Regional TN/VA AirportWSWJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%NowNowwestsouthnortheast
northeastsouthwest
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions, excluding hours in which the mean wind speed is less than 1.0 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

Best Time of Year to Visit

To characterize how pleasant the weather is at Tri-Cities Regional TN/VA Airport throughout the year, we compute two travel scores.

The tourism score favors clear, rainless days with perceived temperatures between 65°F and 80°F. Based on this score, the best times of year to visit Tri-Cities Regional TN/VA Airport for general outdoor tourist activities are from early June to mid July and from mid July to late September, with a peak score in the last week of August.

Tourism Score

Tourism Score at Tri-Cities Regional TN/VA Airportbest timeJanFebMarAprMayJunJulAugSepOctNovDec02468106.66.60.40.46.26.25.95.9NowNow precipitationprecipitationcloudscloudstemperaturetemperaturetourism score
The tourism score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best time of year to visit Tri-Cities Regional TN/VA Airport for hot-weather activities is from late June to late August, with a peak score in the last week of July.

Beach/Pool Score

Beach/Pool Score at Tri-Cities Regional TN/VA Airportbest timeJanFebMarAprMayJunJulAugSepOctNovDec02468105.55.50.00.0NowNow precipitationprecipitationcloudscloudstemperaturetemperaturebeach/pool score
The beach/pool score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

Methodology

For each hour between 8:00 AM and 9:00 PM of each day in the analysis period (1980 to 2016), independent scores are computed for perceived temperature, cloud cover, and total precipitation. Those scores are combined into a single hourly composite score, which is then aggregated into days, averaged over all the years in the analysis period, and smoothed.

Our cloud cover score is 10 for fully clear skies, falling linearly to 9 for mostly clear skies, and to 1 for fully overcast skies.

Our precipitation score, which is based on the three-hour precipitation centered on the hour in question, is 10 for no precipitation, falling linearly to 9 for trace precipitation, and to 0 for 0.04 inches of precipitation or more.

Our tourism temperature score is 0 for perceived temperatures below 50°F, rising linearly to 9 for 65°F, to 10 for 75°F, falling linearly to 9 for 80°F, and to 1 for 90°F or hotter.

Our beach/pool temperature score is 0 for perceived temperatures below 65°F, rising linearly to 9 for 75°F, to 10 for 82°F, falling linearly to 9 for 90°F, and to 1 for 100°F or hotter.

Growing Season

Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).

The growing season at Tri-Cities Regional TN/VA Airport typically lasts for 6.5 months (198 days), from around April 10 to around October 26, rarely starting before March 24 or after April 29, and rarely ending before October 8 or after November 12.

Time Spent in Various Temperature Bands and the Growing Season

Time Spent in Various Temperature Bands and the Growing Season at Tri-Cities Regional TN/VA Airportgrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%50%Apr 1050%Apr 1050%Oct 2650%Oct 2690%Apr 2990%Apr 2990%Oct 890%Oct 810%Mar 2410%Mar 2410%Nov 1210%Nov 120%Dec 150%Dec 15Jul 23100%Jul 23100%NowNowfreezingvery coldcoldcoolcomfortablewarmhotfrigid
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The percentage of time spent in various temperature bands. The black line is the percentage chance that a given day is within the growing season.

Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F.

Based on growing degree days alone, the first spring blooms at Tri-Cities Regional TN/VA Airport should appear around March 11, only rarely appearing before February 28 or after March 27.

Growing Degree Days

Growing Degree Days at Tri-Cities Regional TN/VA AirportJanFebMarAprMayJunJulAugSepOctNovDec0°F500°F1,000°F1,500°F2,000°F2,500°F3,000°F3,500°F4,000°FMar 1188°FMar 1188°FJun 1900°FJun 1900°FJul 121,800°FJul 121,800°FDec 313,884°FDec 313,884°FNowNow
The average growing degree days accumulated over the course of the year, with 25th to 75th and 10th to 90th percentile bands.

Solar Energy

This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation.

The average daily incident shortwave solar energy experiences significant seasonal variation over the course of the year.

The brighter period of the year lasts for 4.4 months, from April 20 to August 31, with an average daily incident shortwave energy per square meter above 5.9 kWh. The brightest day of the year is June 22, with an average of 6.8 kWh.

The darker period of the year lasts for 3.0 months, from November 9 to February 9, with an average daily incident shortwave energy per square meter below 3.2 kWh. The darkest day of the year is December 23, with an average of 2.3 kWh.

Average Daily Incident Shortwave Solar Energy

Average Daily Incident Shortwave Solar Energy at Tri-Cities Regional TN/VA AirportbrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh1 kWh2 kWh3 kWh4 kWh5 kWh6 kWh7 kWh8 kWh9 kWhJun 226.8 kWhJun 226.8 kWhDec 232.3 kWhDec 232.3 kWhApr 205.9 kWhApr 205.9 kWhAug 315.9 kWhAug 315.9 kWhFeb 93.2 kWhFeb 93.2 kWhNowNow
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.

Topography

For the purposes of this report, the geographical coordinates of Tri-Cities Regional TN/VA Airport are 36.481 deg latitude, -82.407 deg longitude, and 1,506 ft elevation.

The topography within 2 miles of Tri-Cities Regional TN/VA Airport contains significant variations in elevation, with a maximum elevation change of 499 feet and an average elevation above sea level of 1,516 feet. Within 10 miles contains significant variations in elevation (1,040 feet). Within 50 miles contains very significant variations in elevation (5,587 feet).

The area within 2 miles of Tri-Cities Regional TN/VA Airport is covered by cropland (74%), trees (12%), and artificial surfaces (10%), within 10 miles by cropland (44%) and trees (39%), and within 50 miles by trees (74%) and cropland (23%).

Data Sources

This report illustrates the typical weather at Tri-Cities Regional TN/VA Airport, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.

Temperature and Dew Point

Tri-Cities Regional TN/VA Airport has a weather station that reported reliably enough during the analysis period that we have included it in our network. When available, historical temperature and dew point measurements are taken directly from this weather station. These records are obtained from NOAA's Integrated Surface Hourly data set, falling back on ICAO METAR records as required.

In the case of missing or erroneous measurements from this station, we fall back on records from nearby stations, adjusted according to typical seasonal and diurnal intra-station differences. For a given day of the year and hour of the day, the fallback station is selected to minimize the prediction error over the years for which there are measurements for both stations.

The stations on which we may fall back include but are not limited to Virginia Highlands Airport; Lonesome Pine Airport; Boone, Watauga County Hospital Heliport; Tazewell County Airport; Tazewell County Airport; Ashe County Airport; Pikeville Remote Automatic Meteorological Observing System; and Foothills Regional Airport.

Other Data

All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , by Jean Meeus.

All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.

Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations.

Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory.

Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .

Time zones for aiports and weather stations are provided by AskGeo.com .

Maps are © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.

Disclaimer

The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.

We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.

We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.