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Average Weather in December in Collinsville Alabama, United States

In Collinsville, the month of December is characterized by falling daily high temperatures, with daily highs decreasing by 6°F, from 57°F to 51°F over the course of the month, and rarely exceeding 69°F or dropping below 38°F.

Daily low temperatures decrease by 4°F, from 39°F to 34°F, rarely falling below 21°F or exceeding 54°F.

For reference, on July 23, the hottest day of the year, temperatures in Collinsville typically range from 69°F to 88°F, while on January 26, the coldest day of the year, they range from 33°F to 51°F.

Average High and Low Temperature in December

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 December. 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 December

Average Hourly Temperature in December in Collinsville18152229112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM4 AM8 AM12 PM4 PM8 PM12 AMNovJancoolcoldvery cold
The average hourly temperature, color coded into bands: 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 shaded overlays indicate night and civil twilight.

Clouds

The month of December in Collinsville experiences gradually increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 48% to 54%.

The clearest day of the month is December 1, with clear, mostly clear, or partly cloudy conditions 52% of the time.

For reference, on January 5, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 55%, while on September 20, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 67%.

Cloud Cover Categories in December

Cloud Cover Categories in December in Collinsville1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%NovJanDec 152%Dec 152%Dec 3146%Dec 3146%Dec 1149%Dec 1149%Dec 2147%Dec 2147%clearmostly clearpartly cloudymostly cloudyovercast
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 Collinsville, the chance of a wet day over the course of December is essentially constant, remaining around 29% throughout.

For reference, the year's highest daily chance of a wet day is 43% on July 9, and its lowest chance is 21% on October 15.

Probability of Precipitation in December

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 December in Collinsville is gradually decreasing, starting the month at 4.7 inches, when it rarely exceeds 7.9 inches or falls below 2.1 inches, and ending the month at 4.3 inches, when it rarely exceeds 7.7 inches or falls below 1.8 inches.

The highest average 31-day accumulation is 4.7 inches on December 3.

Average Monthly Rainfall in December

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 December in Collinsville, the length of the day is essentially constant. The shortest day of the month is December 21, with 9 hours, 52 minutes of daylight and the longest day is December 1, with 10 hours, 2 minutes of daylight.

Hours of Daylight and Twilight in December

Hours of Daylight and Twilight in December in Collinsville1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hrNovJanDec 219 hr, 52 minDec 219 hr, 52 minnightnightdaydayDec 110 hr, 2 minDec 110 hr, 2 min
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 Collinsville is 6:31 AM on December 1 and the latest sunrise is 18 minutes later at 6:49 AM on December 31.

The earliest sunset is 4:33 PM on December 5 and the latest sunset is 11 minutes later at 4:43 PM on December 31.

Daylight saving time is observed in Collinsville during 2017, but it neither starts nor ends during December, so the entire month is in standard time.

For reference, on June 21, the longest day of the year, the Sun rises at 5:31 AM and sets 14 hours, 27 minutes later, at 7:58 PM, while on December 21, the shortest day of the year, it rises at 6:45 AM and sets 9 hours, 52 minutes later, at 4:37 PM.

Sunrise & Sunset with Twilight and Daylight Saving Time in December

Sunrise & Sunset with Twilight and Daylight Saving Time in December in Collinsville18152229112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMNovJan6:31 AM6:31 AMDec 14:33 PMDec 14:33 PM6:49 AM6:49 AMDec 314:43 PMDec 314:43 PM6:39 AM6:39 AMDec 114:34 PMDec 114:34 PM6:45 AM6:45 AMDec 214:37 PMDec 214:37 PMSolarMidnightSolarMidnightSolarNoonSunriseSunset
The solar day over the course of December. 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 Collinsville is essentially constant during December, remaining around 0% throughout.

For reference, on July 23, the muggiest day of the year, there are muggy conditions 87% of the time, while on January 23, the least muggy day of the year, there are muggy conditions 0% of the time.

Humidity Comfort Levels in December

Humidity Comfort Levels in December in Collinsville1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%10%20%30%40%50%60%70%80%90%100%NovJanDec 10%Dec 10%Dec 310%Dec 310%Dec 110%Dec 110%Dec 210%Dec 210%drydrycomfortablecomfortablehumidhumidmuggymuggy
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 Collinsville is essentially constant during December, remaining within 0.1 miles per hour of 5.1 miles per hour throughout.

For reference, on February 26, the windiest day of the year, the daily average wind speed is 5.7 miles per hour, while on August 1, the calmest day of the year, the daily average wind speed is 3.3 miles per hour.

Average Wind Speed in December

The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.
The wind direction in Collinsville during December is predominantly out of the south from December 1 to December 20 and the north from December 20 to December 31.

Wind Direction in December

Wind Direction in December in CollinsvilleNSN1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%NovJansoutheastwestnorth
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).

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 Collinsville typically lasts for 7.1 months (217 days), from around March 31 to around November 3, rarely starting before March 9 or after April 21, and rarely ending before October 16 or after November 21.

The month of December in Collinsville is reliably fully outside of the growing season.

Time Spent in Various Temperature Bands and the Growing Season in December

Time Spent in Various Temperature Bands and the Growing Season in December in Collinsville1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%NovJanDec 13%Dec 13%Dec 31-0%Dec 31-0%Dec 110%Dec 110%Dec 21-0%Dec 21-0%50%Nov 350%Nov 3Nov 2110%Nov 2110%freezingcoldcoolvery coldcomfortable
The percentage of time spent in various temperature bands: 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 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.

The average accumulated growing degree days in Collinsville is gradually increasing during December, increasing by 58°F, from 4,619°F to 4,676°F, over the course of the month.

Growing Degree Days in December

The average growing degree days accumulated over the course of December, 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 in Collinsville is essentially constant during December, remaining within 0.2 kWh of 2.6 kWh throughout.

The lowest average daily incident shortwave solar energy during December is 2.4 kWh on December 25.

Average Daily Incident Shortwave Solar Energy in December

Average Daily Incident Shortwave Solar Energy in December in Collinsville1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310.0 kWh0.5 kWh1.0 kWh1.5 kWh2.0 kWh2.5 kWh3.0 kWh3.5 kWh4.0 kWh4.5 kWh5.0 kWhNovJanDec 252.4 kWhDec 252.4 kWhDec 12.8 kWhDec 12.8 kWhDec 112.6 kWhDec 112.6 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 Collinsville are 34.264 deg latitude, -85.861 deg longitude, and 925 ft elevation.

The topography within 2 miles of Collinsville contains significant variations in elevation, with a maximum elevation change of 712 feet and an average elevation above sea level of 944 feet. Within 10 miles contains significant variations in elevation (1,132 feet). Within 50 miles also contains very significant variations in elevation (1,939 feet).

The area within 2 miles of Collinsville is covered by trees (68%) and cropland (32%), within 10 miles by trees (50%) and cropland (45%), and within 50 miles by trees (60%) and cropland (32%).

Data Sources

This report illustrates the typical weather in Collinsville 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 4 weather stations near enough to contribute to our estimation of the temperature and dew point in Collinsville.

For each station, the records are corrected for the elevation difference between that station and Collinsville 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 Collinsville is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Collinsville and a given station.

The stations contributing to this reconstruction are: Isbell Field (43%, 27 kilometers, northeast); Albertville, Albertville Municipal Airport (27%, 37 kilometers, west); Northeast Alabama Regional Airport (23%, 39 kilometers, southwest); and West Georgia Regional Airport - O V Gray Field (6%, 96 kilometers, southeast).

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.