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Average Weather in Knoxville Georgia, United States

In Knoxville, the summers are hot and muggy; the winters are short, cold, and wet; and it is partly cloudy year round. Over the course of the year, the temperature typically varies from 38°F to 91°F and is rarely below 25°F or above 97°F.

Based on the tourism score, the best times of year to visit Knoxville for warm-weather activities are from mid April to early June and from early September to late October.

Climate Summary

coolwarmhotwarmcoolJanFebMarAprMayJunJulAugSepOctNovDec67%67%49%49%clearovercastprecipitation: 4.5 inprecipitation: 4.5 in2.3 in2.3 inmuggy: 95%muggy: 95%0%0%drydrytourism score: 6.3tourism score: 6.31.81.8
Click on each chart for more information.

Temperature

The hot season lasts for 3.9 months, from May 22 to September 18, with an average daily high temperature above 84°F. The hottest day of the year is July 22, with an average high of 91°F and low of 72°F.

The cool season lasts for 2.9 months, from November 29 to February 25, with an average daily high temperature below 64°F. The coldest day of the year is January 24, with an average low of 38°F and high of 57°F.

Average High and Low Temperature

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 in KnoxvilleJanFebMarAprMayJunJulAugSepOctNovDec12 AM4 AM8 AM12 PM4 PM8 PM12 AMvery coldcoldcoldcoldcoldcoolcoolcomfortablewarmwarmhotvery coldvery cold
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.

Matmata, Tunisia (5,223 miles away) and Muzaffarābād, Pakistan (7,584 miles) are the far-away foreign places with temperatures most similar to Knoxville (view comparison).

Clouds

In Knoxville, the average percentage of the sky covered by clouds experiences mild seasonal variation over the course of the year.

The clearer part of the year in Knoxville begins around August 21 and lasts for 3.1 months, ending around November 26. On October 27, 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 26 and lasts for 8.9 months, ending around August 21. On January 3, the cloudiest day of the year, the sky is overcast or mostly cloudy 51% of the time, and clear, mostly clear, or partly cloudy 49% of the time.

Cloud Cover Categories

Cloud Cover Categories in KnoxvilleclearercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Oct 2767%Oct 2767%Jan 349%Jan 349%Aug 2158%Aug 2158%clearmostly 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 in Knoxville varies throughout the year.

The wetter season lasts 3.2 months, from May 30 to September 4, with a greater than 32% chance of a given day being a wet day. The chance of a wet day peaks at 47% on July 10.

The drier season lasts 8.8 months, from September 4 to May 30. The smallest chance of a wet day is 17% 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 47% on July 10.

Daily Chance of Precipitation

Daily Chance of Precipitation in KnoxvillewetdrydryJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Jul 1047%Jul 1047%Oct 2917%Oct 2917%Jan 128%Jan 128%May 3032%May 3032%Sep 432%Sep 432%rain
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. Knoxville experiences significant seasonal variation in monthly rainfall.

Rain falls throughout the year in Knoxville. The most rain falls during the 31 days centered around February 22, with an average total accumulation of 4.5 inches.

The least rain falls around October 22, 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.

Sun

The length of the day in Knoxville varies significantly over the course of the year. In 2018, the shortest day is December 21, with 10 hours, 0 minutes of daylight; the longest day is June 21, with 14 hours, 19 minutes of daylight.

Hours of Daylight and Twilight

Hours of Daylight and Twilight in KnoxvilleJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 8 minMar 2012 hr, 8 minMar 2014 hr, 19 minJun 2114 hr, 19 minJun 2112 hr, 8 minSep 2212 hr, 8 minSep 2210 hr, 0 minDec 2110 hr, 0 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 6:27 AM on June 12, and the latest sunrise is 1 hour, 28 minutes later at 7:55 AM on November 3. The earliest sunset is at 5:29 PM on December 4, and the latest sunset is 3 hours, 18 minutes later at 8:47 PM on June 29.

Daylight saving time (DST) is observed in Knoxville 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

Sunrise & Sunset with Twilight and Daylight Saving Time in KnoxvilleJanFebMarAprMayJunJulAugSepOctNovDec2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 126:27 AMJun 126:27 AM8:47 PMJun 298:47 PMJun 29Dec 45:29 PMDec 45:29 PM7:55 AMNov 37:55 AMNov 3Mar 11DSTMar 11DSTDSTNov 4DSTNov 4daynightnightnightnightSolarMidnightSolarMidnightSolarNoonSunriseSunset
The solar day over the course of the year 2018. 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.

Knoxville experiences extreme seasonal variation in the perceived humidity.

The muggier period of the year lasts for 5.0 months, from May 11 to October 10, during which time the comfort level is muggy, oppressive, or miserable at least 24% of the time. The muggiest day of the year is July 25, with muggy conditions 95% of the time.

The least muggy day of the year is January 24, when muggy conditions are essentially unheard of.

Humidity Comfort Levels

Humidity Comfort Levels in KnoxvillemuggyJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Jan 240%Jan 240%95%Jul 2595%Jul 25May 1124%May 1124%Oct 1024%Oct 1024%oppressiveoppressivedrydryhumidhumidmiserablemiserablemuggymuggy
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 in Knoxville experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 6.9 months, from October 16 to May 12, with average wind speeds of more than 5.0 miles per hour. The windiest day of the year is March 8, with an average hourly wind speed of 6.1 miles per hour.

The calmer time of year lasts for 5.1 months, from May 12 to October 16. The calmest day of the year is August 8, with an average hourly wind speed of 3.9 miles per hour.

Average Wind Speed

Average Wind Speed in KnoxvillewindywindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph1 mph2 mph3 mph4 mph5 mph6 mph7 mph8 mph9 mphMar 86.1 mphMar 86.1 mphAug 83.9 mphAug 83.9 mphOct 165.0 mphOct 165.0 mphMay 125.0 mphMay 125.0 mph
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 in Knoxville varies throughout the year.

The wind is most often from the east for 3.6 months, from August 13 to November 30, with a peak percentage of 45% on September 8. The wind is most often from the north for 2.4 weeks, from November 30 to December 17, with a peak percentage of 28% on December 4. The wind is most often from the west for 7.9 months, from December 17 to August 13, with a peak percentage of 31% on January 1.

Wind Direction

Wind Direction in KnoxvilleWENWJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%westsoutheastnorth
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 in Knoxville 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 Knoxville for general outdoor tourist activities are from mid April to early June and from early September to late October, with a peak score in the last week of September.

Tourism Score

Tourism Score in Knoxvillebest timebest timeJanFebMarAprMayJunJulAugSepOctNovDec02468106.36.31.81.86.26.24.74.7 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 Knoxville for hot-weather activities is from late May to late September, with a peak score in the last week of August.

Beach/Pool Score

Beach/Pool Score in Knoxvillebest timeJanFebMarAprMayJunJulAugSepOctNovDec02468106.06.00.20.2 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 in Knoxville typically lasts for 8.2 months (252 days), from around March 12 to around November 19, rarely starting before February 12 or after April 4, and rarely ending before October 29 or after December 13.

Time Spent in Various Temperature Bands and the Growing Season

Time Spent in Various Temperature Bands and the Growing Season in Knoxvillegrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%50%Mar 1250%Mar 1250%Nov 1950%Nov 1990%Apr 490%Apr 490%Oct 2990%Oct 2910%Feb 1210%Feb 1210%Dec 1310%Dec 130%Jan 70%Jan 7Jul 18100%Jul 18100%very coldcoldcoolcomfortablewarmhot
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 in Knoxville should appear around January 30, only rarely appearing before January 17 or after February 15.

Growing Degree Days

Growing Degree Days in KnoxvilleJanFebMarAprMayJunJulAugSepOctNovDec0°F1,000°F2,000°F3,000°F4,000°F5,000°F6,000°FJan 3089°FJan 3089°FApr 29900°FApr 29900°FDec 315,746°FDec 315,746°F
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 4.2 months, from April 10 to August 15, with an average daily incident shortwave energy per square meter above 6.0 kWh. The brightest day of the year is May 19, with an average of 6.8 kWh.

The darker period of the year lasts for 2.7 months, from November 14 to February 4, with an average daily incident shortwave energy per square meter below 3.5 kWh. The darkest day of the year is December 23, with an average of 2.7 kWh.

Average Daily Incident Shortwave Solar Energy

Average Daily Incident Shortwave Solar Energy in KnoxvillebrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh1 kWh2 kWh3 kWh4 kWh5 kWh6 kWh7 kWh8 kWh9 kWhMay 196.8 kWhMay 196.8 kWhDec 232.7 kWhDec 232.7 kWhAug 156.0 kWhAug 156.0 kWhFeb 43.5 kWhFeb 43.5 kWh
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 Knoxville are 32.724 deg latitude, -83.998 deg longitude, and 522 ft elevation.

The topography within 2 miles of Knoxville contains only modest variations in elevation, with a maximum elevation change of 328 feet and an average elevation above sea level of 503 feet. Within 10 miles also contains only modest variations in elevation (417 feet). Within 50 miles contains only modest variations in elevation (1,188 feet).

The area within 2 miles of Knoxville is covered by trees (76%) and artificial surfaces (14%), within 10 miles by trees (83%) and cropland (11%), and within 50 miles by trees (69%) and cropland (21%).

Data Sources

This report illustrates the typical weather in Knoxville, 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

There are 3 weather stations near enough to contribute to our estimation of the temperature and dew point in Knoxville.

For each station, the records are corrected for the elevation difference between that station and Knoxville according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.

The estimated value at Knoxville is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Knoxville and a given station.

The stations contributing to this reconstruction are: Middle Georgia Regional Airport (46%, 33 kilometers, east); Thomaston, Thomaston-Upson County Airport (39%, 36 kilometers, northwest); and Jimmy Carter Regional Airport (15%, 71 kilometers, south).

Other Data

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.

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.