Average Weather in Graysville Tennessee, United States
In Graysville, the summers are hot and muggy; 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 32°F to 88°F and is rarely below 18°F or above 94°F.
Based on the tourism score, the best times of year to visit Graysville for warm-weather activities are from mid May to late June and from early August to early October.
The hot season lasts for 3.8 months, from May 25 to September 20, with an average daily high temperature above 80°F. The hottest day of the year is July 22, with an average high of 88°F and low of 70°F.
The cold season lasts for 2.9 months, from November 29 to February 25, with an average daily high temperature below 56°F. The coldest day of the year is January 29, with an average low of 32°F and high of 49°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
In Graysville, 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 in Graysville begins around July 3 and lasts for 4.5 months, ending around November 17. 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 17 and lasts for 7.5 months, ending around July 3. On January 3, the cloudiest day of the year, the sky is overcast or mostly cloudy 56% of the time, and clear, mostly clear, or partly cloudy 44% of the time.
Cloud Cover Categories
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Graysville varies throughout the year.
The wetter season lasts 5.2 months, from March 17 to August 22, with a greater than 32% chance of a given day being a wet day. The chance of a wet day peaks at 43% on July 9.
The drier season lasts 6.8 months, from August 22 to March 17. The smallest chance of a wet day is 21% on October 16.
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 43% on July 9.
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. Graysville experiences significant seasonal variation in monthly rainfall.
Rain falls throughout the year in Graysville. The most rain falls during the 31 days centered around December 1, with an average total accumulation of 5.0 inches.
The least rain falls around August 22, with an average total accumulation of 2.8 inches.
Average Monthly Rainfall
The sliding 31-day liquid-equivalent quantity of snowfall in Graysville 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 in Graysville varies significantly over the course of the year. In 2017, the shortest day is December 21, with 9 hours, 46 minutes of daylight; the longest day is June 21, with 14 hours, 33 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 6:24 AM on June 13, and the latest sunrise is 1 hour, 41 minutes later at 8:05 AM on November 4. The earliest sunset is at 5:27 PM on December 5, and the latest sunset is 3 hours, 32 minutes later at 8:59 PM on June 28.
Daylight saving time (DST) is observed in Graysville during 2017, starting in the spring on March 12, lasting 7.8 months, and ending in the fall on November 5.
Sunrise & Sunset with Twilight and Daylight Saving Time
Graysville experiences extreme seasonal variation in the perceived humidity.
The muggier period of the year lasts for 4.2 months, from May 20 to September 26, during which time the comfort level is muggy, oppressive, or miserable at least 21% of the time. The muggiest day of the year is July 25, with muggy conditions 83% of the time.
The least muggy day of the year is December 27, when muggy conditions are essentially unheard of.
Humidity Comfort Levels
The average hourly wind speed in Graysville experiences mild seasonal variation over the course of the year.
The windier part of the year lasts for 6.5 months, from October 28 to May 12, with average wind speeds of more than 4.3 miles per hour. The windiest day of the year is February 25, with an average hourly wind speed of 5.5 miles per hour.
The calmer time of year lasts for 5.5 months, from May 12 to October 28. The calmest day of the year is August 1, with an average hourly wind speed of 3.2 miles per hour.
Average Wind Speed
The predominant average hourly wind direction in Graysville varies throughout the year.
The wind is most often from the north for 1.1 weeks, from January 26 to February 3 and for 1.1 weeks, from August 4 to August 12, with a peak percentage of 33% on January 29. The wind is most often from the south for 4.8 months, from February 3 to June 26 and for 5.5 months, from August 12 to January 26, with a peak percentage of 41% on May 4. The wind is most often from the west for 1.3 months, from June 26 to August 4, with a peak percentage of 37% on July 14.
Best Time of Year to Visit
To characterize how pleasant the weather is in Graysville 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 Graysville for general outdoor tourist activities are from mid May to late June and from early August to early October, with a peak score in the third 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 Graysville for hot-weather activities is from late 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.
The growing season in Graysville typically lasts for 7.3 months (223 days), from around March 29 to around November 7, rarely starting before March 8 or after April 17, and rarely ending before October 20 or after November 26.
Time Spent in Various Temperature Bands and the Growing Season
Based on growing degree days alone, the first spring blooms in Graysville should appear around February 26, only rarely appearing before February 10 or after March 14.
Growing Degree Days
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 4.6 months, from April 15 to September 2, with an average daily incident shortwave energy per square meter above 5.8 kWh. The brightest day of the year is June 23, with an average of 6.7 kWh.
The darker period of the year lasts for 2.9 months, from November 11 to February 7, with an average daily incident shortwave energy per square meter below 3.2 kWh. The darkest day of the year is December 24, with an average of 2.3 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Graysville are 35.447 deg latitude, -85.084 deg longitude, and 909 ft elevation.
The topography within 2 miles of Graysville contains very significant variations in elevation, with a maximum elevation change of 1,050 feet and an average elevation above sea level of 926 feet. Within 10 miles also contains very significant variations in elevation (1,572 feet). Within 50 miles contains very significant variations in elevation (3,724 feet).
The area within 2 miles of Graysville is covered by trees (73%) and cropland (24%), within 10 miles by trees (69%) and cropland (22%), and within 50 miles by trees (66%) and cropland (27%).
This report illustrates the typical weather in Graysville, 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 Graysville.
For each station, the records are corrected for the elevation difference between that station and Graysville 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 Graysville is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Graysville and a given station.
The stations contributing to this reconstruction are: Lovell Field (52%, 48 kilometers, south); Crossville Memorial Airport (34%, 56 kilometers, north); and Western Carolina Regional Airport (14%, 114 kilometers, east).
Time zones for aiports and weather stations are provided by AskGeo.com .