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Average Weather in August in Spencer Tennessee, United States

In Spencer, the month of August is characterized by gradually falling daily high temperatures, with daily highs decreasing by 2°F, from 84°F to 82°F over the course of the month, and rarely exceeding 91°F or dropping below 76°F.

Daily low temperatures decrease by 3°F, from 67°F to 64°F, rarely falling below 57°F or exceeding 72°F.

For reference, on July 21, the hottest day of the year, temperatures in Spencer typically range from 67°F to 85°F, while on January 29, the coldest day of the year, they range from 29°F to 46°F.

Average High and Low Temperature in August

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 hourly average temperatures for the quarter of the year centered on August. The horizontal axis is the day, 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 August

Average Hourly Temperature in August in Spencer12 AM4 AM8 AM12 PM4 PM8 PM12 AM181522291122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930303131JulSepcoolcomfortablewarmcold
The average hourly temperature, color coded into bands: frigid < 15°F < freezing < 32°F < chilly < 45°F < cold < 55°F < cool < 65°F < comfortable < 75°F < warm < 85°F < hot < 95°F < sweltering. The shaded overlays indicate night and civil twilight.

Clouds

The month of August in Spencer experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 35% throughout the month.

The clearest day of the month is August 26, with clear, mostly clear, or partly cloudy conditions 67% of the time.

For reference, on January 3, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 58%, while on September 21, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 67%.

Cloud Cover in August

The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds: clear < 20% < mostly clear < 40% < partly cloudy < 60% < mostly cloudy < 80% < overcast.

Precipitation

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Spencer, the chance of a wet day over the course of August is rapidly decreasing, starting the month at 37% and ending it at 29%.

For reference, the year's highest daily chance of a wet day is 45% on July 9, and its lowest chance is 23% on October 18.

Probability of Precipitation in August

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 month and not just the monthly total, we show the rainfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day rainfall during August in Spencer is gradually decreasing, starting the month at 3.2 inches, when it rarely exceeds 5.3 inches or falls below 1.5 inches, and ending the month at 2.9 inches, when it rarely exceeds 5.3 inches or falls below 1.1 inches.

The lowest average 31-day accumulation is 2.8 inches on August 23.

Average Monthly Rainfall in August

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

Over the course of August in Spencer, the length of the day is decreasing. From the start to the end of the month, the length of the day decreases by 59 minutes, implying an average daily decrease of 1 minute, 58 seconds, and weekly decrease of 13 minutes, 46 seconds.

The shortest day of the month is August 31, with 12 hours, 57 minutes of daylight and the longest day is August 1, with 13 hours, 56 minutes of daylight.

Hours of Daylight and Twilight in August

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 of the month in Spencer is 5:49 AM on August 1 and the latest sunrise is 23 minutes later at 6:13 AM on August 31.

The latest sunset is 7:45 PM on August 1 and the earliest sunset is 36 minutes earlier at 7:10 PM on August 31.

Daylight saving time is observed in Spencer during 2017, but it neither starts nor ends during August, so the entire month is in daylight saving time.

For reference, on June 21, the longest day of the year, the Sun rises at 5:26 AM and sets 14 hours, 35 minutes later, at 8:01 PM, while on December 21, the shortest day of the year, it rises at 6:48 AM and sets 9 hours, 44 minutes later, at 4:32 PM.

Sunrise & Sunset with Twilight in August

The solar day over the course of August. 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.

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.

The chance that a given day will be muggy in Spencer is very rapidly decreasing during August, falling from 71% to 51% over the course of the month.

For reference, on July 24, the muggiest day of the year, there are muggy conditions 75% of the time, while on January 1, the least muggy day of the year, there are muggy conditions 0% of the time.

Humidity Comfort Levels in August

Humidity Comfort Levels in August in Spencer0%10%20%30%40%50%60%70%80%90%100%181522291122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930303131JulSepAug 171%Aug 171%Aug 3151%Aug 3151%Aug 1166%Aug 1166%Aug 2161%Aug 2161%oppressiveoppressivemuggymuggyhumidhumidcomfortablecomfortabledrydrymiserablemiserable
The percentage of time spent at various humidity comfort levels, categorized by dew point: dry < 55°F < comfortable < 60°F < humid < 65°F < muggy < 70°F < oppressive < 75°F < miserable.

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 Spencer is essentially constant during August, remaining within 0.1 miles per hour of 1.8 miles per hour throughout.

For reference, on February 25, the windiest day of the year, the daily average wind speed is 3.3 miles per hour, while on July 31, the calmest day of the year, the daily average wind speed is 1.8 miles per hour.

The lowest daily average wind speed during August is 1.8 miles per hour on August 1.

Average Wind Speed in August

The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.
The wind direction in Spencer during August is predominantly out of the west from August 1 to August 5 and the south from August 5 to August 31.

Wind Direction in August

The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions (north, east, south, and west), excluding hours in which the mean wind speed is less than 1 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

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 in Spencer is gradually decreasing during August, falling by 0.7 kWh, from 6.5 kWh to 5.8 kWh, over the course of the month.

Average Daily Incident Shortwave Solar Energy in August

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 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%).

Data Sources

This report illustrates the typical weather in Spencer year round, 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 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: Crossville Memorial Airport (63%, 42 kilometers, northeast); Lovell Field (21%, 83 kilometers, south); and Smyrna Airport (16%, 99 kilometers, west).

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.