December Weather at Teniente R. Marsh Airport Antarctica

Daily high temperatures increase by 2°F, from 33°F to 36°F, rarely falling below 31°F or exceeding 39°F.

Daily low temperatures increase by 2°F, from 30°F to 33°F, rarely falling below 27°F or exceeding 35°F.

For reference, on February 5, the hottest day of the year, temperatures at Teniente R. Marsh Airport typically range from 34°F to 37°F, while on July 13, the coldest day of the year, they range from 18°F to 26°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.

Nanortalik, Greenland (8,493 miles away) and Tasiilaq, Greenland (8,907 miles) are the far-away foreign places with temperatures most similar to Teniente R. Marsh Airport (view comparison).

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The month of December at Teniente R. Marsh Airport experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 76% throughout the month. The lowest chance of overcast or mostly cloudy conditions is 75% on December 7.

The clearest day of the month is December 7, with clear, mostly clear, or partly cloudy conditions 25% of the time.

For reference, on August 20, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 89%, while on December 6, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 25%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. At Teniente R. Marsh Airport, the chance of a wet day over the course of December is gradually increasing, starting the month at 27% and ending it at 30%.

For reference, the year's highest daily chance of a wet day is 41% on March 12, and its lowest chance is 25% on December 8.

Over the course of December at Teniente R. Marsh Airport, the chance of a day with only rain increases from 13% to 25%, the chance of a day with mixed snow and rain decreases from 9% to 3%, and the chance of a day with only snow decreases from 5% to 1%.

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 Teniente R. Marsh Airport is increasing, starting the month at 0.9 inches, when it rarely exceeds 1.7 inches or falls below 0.2 inches, and ending the month at 1.5 inches, when it rarely exceeds 2.4 inches or falls below 0.7 inches.

Snowfall

As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day snowfall during December at Teniente R. Marsh Airport is rapidly decreasing, starting the month at 4.8 inches, when it rarely exceeds 10.5 inches or falls below 0.5 inches, and ending the month at 1.2 inches, when it rarely exceeds 3.3 inches.

Over the course of December at Teniente R. Marsh Airport, the length of the day is increasing. From the start to the end of the month, the length of the day increases by 34 minutes, implying an average daily increase of 1 minute, 8 seconds, and weekly increase of 7 minutes, 54 seconds.

The shortest day of the month is December 1, with 19 hours, 3 minutes of daylight and the longest day is December 21, with 19 hours, 51 minutes of daylight.

The latest sunrise of the month at Teniente R. Marsh Airport is 3:14 AM on December 1 and the earliest sunrise is 17 minutes earlier at 2:57 AM on December 17.

The earliest sunset is 10:17 PM on December 1 and the latest sunset is 33 minutes later at 10:50 PM on December 24.

Daylight saving time is not observed at Teniente R. Marsh Airport during 2024.

For reference, on December 21, the longest day of the year, the Sun rises at 2:58 AM and sets 19 hours, 51 minutes later, at 10:49 PM, while on June 20, the shortest day of the year, it rises at 10:25 AM and sets 5 hours, 4 minutes later, at 3:29 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 Teniente R. Marsh Airport is essentially constant during December, remaining around 0% throughout.

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 Teniente R. Marsh Airport is decreasing during December, decreasing from 16.6 miles per hour to 15.0 miles per hour over the course of the month.

For reference, on October 4, the windiest day of the year, the daily average wind speed is 20.2 miles per hour, while on January 12, the calmest day of the year, the daily average wind speed is 14.9 miles per hour.

The hourly average wind direction at Teniente R. Marsh Airport throughout December is predominantly from the west, with a peak proportion of 50% on December 5.

Teniente R. Marsh Airport is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water.

The average surface water temperature at Teniente R. Marsh Airport is essentially constant during December, remaining within 1°F of 33°F throughout.

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).

Temperatures at Teniente R. Marsh Airport are sufficiently cold year round that it is not entirely meaningful to discuss the growing season in these terms. We nevertheless include the chart below as an illustration of the distribution of temperatures experienced throughout the year.

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 Teniente R. Marsh Airport are essentially constant during December, remaining around 0°F throughout.

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 Teniente R. Marsh Airport is essentially constant during December, remaining within 0.2 kWh of 4.8 kWh throughout.

The highest average daily incident shortwave solar energy during December is 4.9 kWh on December 18.