Average Weather at Upper Cumberland Regional Airport Tennessee, United States
At Upper Cumberland Regional Airport, the summers are hot and muggy, the winters are very cold, and it is wet and partly cloudy year round. Over the course of the year, the temperature typically varies from 28°F to 89°F and is rarely below 12°F or above 95°F.
Based on the tourism score, the best times of year to visit Upper Cumberland Regional Airport for warm-weather activities are from mid May to mid June and from late July to early October.
The hot season lasts for 3.9 months, from May 24 to September 20, with an average daily high temperature above 81°F. The hottest day of the year is July 21, with an average high of 89°F and low of 66°F.
The cold season lasts for 3.2 months, from November 27 to March 1, with an average daily high temperature below 56°F. The coldest day of the year is January 23, with an average low of 28°F and high of 48°F.
Average High and Low Temperature
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
At Upper Cumberland Regional 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 Upper Cumberland Regional Airport begins around June 14 and lasts for 5.1 months, ending around November 18. On September 21, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 67% of the time, and overcast or mostly cloudy 33% of the time.
The cloudier part of the year begins around November 18 and lasts for 6.9 months, ending around June 14. On January 3, the cloudiest day of the year, the sky is overcast or mostly cloudy 59% of the time, and clear, mostly clear, or partly cloudy 41% of the time.
Cloud Cover Categories
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days at Upper Cumberland Regional Airport varies throughout the year.
The wetter season lasts 4.7 months, from March 31 to August 21, with a greater than 34% chance of a given day being a wet day. The chance of a wet day peaks at 45% on June 29.
The drier season lasts 7.3 months, from August 21 to March 31. The smallest chance of a wet day is 23% on October 15.
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 45% on June 29.
Daily Chance of Precipitation
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. Upper Cumberland Regional Airport experiences some seasonal variation in monthly rainfall.
Rain falls throughout the year at Upper Cumberland Regional Airport. The most rain falls during the 31 days centered around December 2, with an average total accumulation of 4.8 inches.
The least rain falls around August 25, with an average total accumulation of 2.9 inches.
Average Monthly Rainfall
The sliding 31-day liquid-equivalent quantity of snowfall at Upper Cumberland Regional 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
The length of the day at Upper Cumberland Regional Airport varies significantly over the course of the year. In 2018, the shortest day is December 21, with 9 hours, 42 minutes of daylight; the longest day is June 21, with 14 hours, 37 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 5:24 AM on June 13, and the latest sunrise is 1 hour, 42 minutes later at 7:06 AM on November 3. The earliest sunset is at 4:27 PM on December 5, and the latest sunset is 3 hours, 36 minutes later at 8:03 PM on June 28.
Daylight saving time (DST) is observed at Upper Cumberland Regional Airport during 2018, starting in the spring on March 11, lasting 7.8 months, and ending in the fall on November 4.
Sunrise & Sunset with Twilight and Daylight Saving Time
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.
Upper Cumberland Regional Airport experiences extreme seasonal variation in the perceived humidity.
The muggier period of the year lasts for 4.5 months, from May 11 to September 27, during which time the comfort level is muggy, oppressive, or miserable at least 22% of the time. The muggiest day of the year is July 24, with muggy conditions 86% of the time.
The least muggy day of the year is December 22, when muggy conditions are essentially unheard of.
Humidity Comfort Levels
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
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 Upper Cumberland Regional Airport experiences mild seasonal variation over the course of the year.
The windier part of the year lasts for 6.3 months, from October 31 to May 8, with average wind speeds of more than 4.8 miles per hour. The windiest day of the year is February 25, with an average hourly wind speed of 6.2 miles per hour.
The calmer time of year lasts for 5.7 months, from May 8 to October 31. The calmest day of the year is August 1, with an average hourly wind speed of 3.4 miles per hour.
Average Wind Speed
The predominant average hourly wind direction at Upper Cumberland Regional Airport varies throughout the year.
The wind is most often from the west for 1.0 months, from July 3 to August 3, with a peak percentage of 35% on July 14. The wind is most often from the south for 11 months, from August 3 to July 3, with a peak percentage of 38% on January 1.
Best Time of Year to Visit
To characterize how pleasant the weather is at Upper Cumberland Regional 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 Upper Cumberland Regional Airport for general outdoor tourist activities are from mid May to mid June and from late July to early October, with a peak score in the first week of September.
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 Upper Cumberland Regional Airport for hot-weather activities is from mid June to early September, with a peak score in the second week of August.
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.
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 Upper Cumberland Regional Airport typically lasts for 6.2 months (188 days), from around April 11 to around October 16, rarely starting before March 23 or after April 30, and rarely ending before September 27 or after November 4.
Time Spent in Various Temperature Bands and 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 Upper Cumberland Regional Airport should appear around March 1, only rarely appearing before February 12 or after March 18.
Growing Degree Days
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 4.5 months, from April 17 to September 2, with an average daily incident shortwave energy per square meter above 5.7 kWh. The brightest day of the year is June 20, with an average of 6.6 kWh.
The darker period of the year lasts for 2.9 months, from November 11 to February 8, with an average daily incident shortwave energy per square meter below 3.1 kWh. The darkest day of the year is December 24, with an average of 2.2 kWh.
Average Daily Incident Shortwave Solar Energy
This report illustrates the typical weather at Upper Cumberland Regional 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
Upper Cumberland Regional 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 Crossville Memorial Airport, Smyrna Airport, Wayne County Airport, Glasgow Municipal Airport, Lovell Field, Nashville International Airport, Bowling Green-Warren County Regional Airport, and Oak Ridge.
All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Tables of the Sun, Moon and Planets , 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.