December Weather at Demopolis Municipal Airport United States

Daily high temperatures decrease by 6°F, from 63°F to 58°F, rarely falling below 43°F or exceeding 75°F.

Daily low temperatures decrease by 3°F, from 41°F to 38°F, rarely falling below 24°F or exceeding 57°F.

For reference, on July 21, the hottest day of the year, temperatures at Demopolis Municipal Airport typically range from 71°F to 95°F, while on January 17, the coldest day of the year, they range from 37°F to 58°F.

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.

San Juan, Argentina (4,605 miles away) is the far-away foreign place with temperatures most similar to Demopolis Municipal Airport (view comparison).

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The month of December at Demopolis Municipal Airport experiences gradually increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 44% to 51%.

The clearest day of the month is December 2, with clear, mostly clear, or partly cloudy conditions 56% of the time.

For reference, on January 3, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 52%, while on October 7, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 68%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. At Demopolis Municipal Airport, the chance of a wet day over the course of December is essentially constant, remaining around 30% throughout.

For reference, the year's highest daily chance of a wet day is 47% on July 8, and its lowest chance is 21% on October 7.

Over the course of December at Demopolis Municipal Airport, the chance of a day with only rain remains an essentially constant 29% throughout, the chance of a day with mixed snow and rain remains an essentially constant 1% throughout, and the chance of a day with only snow remains an essentially constant 0% throughout.

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 at Demopolis Municipal Airport is essentially constant, remaining about 4.7 inches throughout, and rarely exceeding 7.8 inches or falling below 2.0 inches.

Over the course of December at Demopolis Municipal Airport, the length of the day is essentially constant. The shortest day of the month is December 21, with 10 hours, 1 minute of daylight and the longest day is December 1, with 10 hours, 10 minutes of daylight.

The earliest sunrise of the month at Demopolis Municipal Airport is 6:35 AM on December 1 and the latest sunrise is 17 minutes later at 6:53 AM on December 31.

The earliest sunset is 4:46 PM on December 3 and the latest sunset is 11 minutes later at 4:57 PM on December 31.

Daylight saving time is observed at Demopolis Municipal Airport during 2024, but it neither starts nor ends during December, so the entire month is in daylight saving time.

For reference, on June 20, the longest day of the year, the Sun rises at 5:44 AM and sets 14 hours, 17 minutes later, at 8:02 PM, while on December 21, the shortest day of the year, it rises at 6:49 AM and sets 10 hours, 1 minute later, at 4:50 PM.

The figure below presents a compact representation of the sun's elevation (the angle of the sun above the horizon) and azimuth (its compass bearing) for every hour of every day in the reporting period. The horizontal axis is the day of the year and the vertical axis is the hour of the day. For a given day and hour of that day, the background color indicates the azimuth of the sun at that moment. The black isolines are contours of constant solar elevation.

The figure below presents a compact representation of key lunar data for December 2024. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases. The label associated with each bar indicates the date and time that the phase is obtained, and the companion time labels indicate the rise and set times of the Moon for the nearest time interval in which the moon is above the horizon.

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 at Demopolis Municipal Airport is essentially constant during December, remaining within 1% of 2% throughout.

For reference, on July 22, the muggiest day of the year, there are muggy conditions 96% of the time, while on January 29, the least muggy day of the year, there are muggy conditions 1% of the time.

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 at Demopolis Municipal Airport is essentially constant during December, remaining within 0.1 miles per hour of 4.7 miles per hour throughout.

For reference, on February 25, the windiest day of the year, the daily average wind speed is 5.1 miles per hour, while on July 27, the calmest day of the year, the daily average wind speed is 3.2 miles per hour.

The hourly average wind direction at Demopolis Municipal Airport throughout December is predominantly from the north, with a peak proportion of 37% on December 24.

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 at Demopolis Municipal Airport typically lasts for 7.8 months (239 days), from around March 16 to around November 10, rarely starting before February 25 or after April 7, and rarely ending before October 22 or after November 29.

The month of December at Demopolis Municipal Airport is very likely fully outside of the growing season, with the chance that a given day is in the growing season gradually decreasing from 8% to 0% over the course of the month.

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 at Demopolis Municipal Airport are gradually increasing during December, increasing by 137°F, from 5,652°F to 5,789°F, over the course of the month.

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 at Demopolis Municipal Airport is essentially constant during December, remaining within 0.1 kWh of 2.8 kWh throughout.

The lowest average daily incident shortwave solar energy during December is 2.7 kWh on December 23.