Average Weather in Spencer Tennessee, United States
In Spencer, the summers are warm and muggy, the winters are 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 91°F.
Based on the tourism score, the best times of year to visit Spencer for warm-weather activities are for the entire month of June and from late July to late September.
The hot season lasts for 3.8 months, from May 25 to September 20, with an average daily high temperature above 77°F. The hottest day of the year is July 21, with an average high of 85°F and low of 66°F.
The cold season lasts for 3.0 months, from November 28 to February 27, with an average daily high temperature below 53°F. The coldest day of the year is January 23, with an average low of 28°F and high of 45°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 Spencer, 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 Spencer begins around June 13 and lasts for 5.2 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 6.8 months, ending around June 13. On January 3, 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
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Spencer varies throughout the year.
The wetter season lasts 3.9 months, from April 25 to August 20, with a greater than 34% chance of a given day being a wet day. The chance of a wet day peaks at 45% on July 9.
The drier season lasts 8.1 months, from August 20 to April 25. 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 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. Spencer experiences significant seasonal variation in monthly rainfall.
Rain falls throughout the year in Spencer. The most rain falls during the 31 days centered around December 2, with an average total accumulation of 4.9 inches.
The least rain falls around August 23, with an average total accumulation of 2.8 inches.
Average Monthly Rainfall
We report snowfall in liquid-equivalent terms. The actual depth of new snowfall is typically between 5 and 10 times the liquid-equivalent amount, assuming the ground is frozen. Colder, drier snow tends to be on the higher end of that range and warmer, wetter snow on the lower end.
As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day of the year. Spencer experiences some seasonal variation in monthly liquid-equivalent snowfall.
The snowy period of the year lasts for 3.1 months, from December 7 to March 11, with a sliding 31-day liquid-equivalent snowfall of at least 0.1 inches. The most snow falls during the 31 days centered around February 1, with an average total liquid-equivalent accumulation of 0.3 inches.
The snowless period of the year lasts for 8.9 months, from March 11 to December 7. The least snow falls around July 23, with an average total liquid-equivalent accumulation of 0.0 inches.
Average Liquid-Equivalent Monthly Snowfall
The length of the day in Spencer varies significantly over the course of the year. In 2017, the shortest day is December 21, with 9 hours, 44 minutes of daylight; the longest day is June 20, with 14 hours, 35 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 5:25 AM on June 12, and the latest sunrise is 1 hour, 42 minutes later at 7:07 AM on November 4. The earliest sunset is at 4:28 PM on December 5, and the latest sunset is 3 hours, 34 minutes later at 8:01 PM on June 28.
Daylight saving time (DST) is observed in Spencer 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
Spencer experiences extreme seasonal variation in the perceived humidity.
The muggier period of the year lasts for 4.1 months, from May 21 to September 24, during which time the comfort level is muggy, oppressive, or miserable at least 20% of the time. The muggiest day of the year is July 25, with muggy conditions 79% of the time.
The least muggy day of the year is January 23, when muggy conditions are essentially unheard of.
Humidity Comfort Levels
The average hourly wind speed in Spencer experiences mild seasonal variation over the course of the year.
The windier part of the year lasts for 6.4 months, from October 29 to May 9, with average wind speeds of more than 4.7 miles per hour. The windiest day of the year is February 25, with an average hourly wind speed of 6.0 miles per hour.
The calmer time of year lasts for 5.6 months, from May 9 to October 29. The calmest day of the year is July 31, with an average hourly wind speed of 3.3 miles per hour.
Average Wind Speed
The predominant average hourly wind direction in Spencer varies throughout the year.
The wind is most often from the west for 1.3 months, from June 29 to August 7, with a peak percentage of 37% on July 14. The wind is most often from the south for 11 months, from August 7 to June 29, with a peak percentage of 37% on January 1.
Best Time of Year to Visit
To characterize how pleasant the weather is in Spencer 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 Spencer for general outdoor tourist activities are for the entire month of June and from late July to late September, with a peak score in the last week of August.
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 Spencer for hot-weather activities is from late June to early September, with a peak score in the last week of July.
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 Spencer typically lasts for 6.4 months (195 days), from around April 9 to around October 21, rarely starting before March 22 or after April 27, and rarely ending before October 4 or after November 9.
Time Spent in Various Temperature Bands and the Growing Season
Based on growing degree days alone, the first spring blooms in Spencer should appear around March 9, only rarely appearing before February 22 or after March 25.
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 16 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 22, with an average of 6.6 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 3.1 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 Spencer are 35.747 deg latitude, -85.467 deg longitude, and 1,617 ft elevation.
The topography within 2 miles of Spencer contains very significant variations in elevation, with a maximum elevation change of 902 feet and an average elevation above sea level of 1,652 feet. Within 10 miles also contains very significant variations in elevation (1,257 feet). Within 50 miles contains very significant variations in elevation (2,595 feet).
The area within 2 miles of Spencer is covered by trees (87%) and cropland (11%), within 10 miles by trees (71%) and cropland (29%), and within 50 miles by trees (66%) and cropland (30%).
This report illustrates the typical weather in Spencer, 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 5 weather stations near enough to contribute to our estimation of the temperature and dew point in Spencer.
For each station, the records are corrected for the elevation difference between that station and Spencer 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 Spencer is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Spencer and a given station.
The stations contributing to this reconstruction are: Upper Cumberland Regional Airport (35%, 35 kilometers, north); Crossville Memorial Airport (32%, 42 kilometers, northeast); Tullahoma Regional Airport/William Northern Field (11%, 82 kilometers, southwest); Lovell Field (11%, 83 kilometers, south); and Winchester Municipal Airport (11%, 83 kilometers, southwest).
Time zones for aiports and weather stations are provided by AskGeo.com .