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Average Weather in December in Port-aux-Français French Southern Territories

Daily high temperatures increase by 2°F, from 43°F to 45°F, rarely falling below 39°F or exceeding 49°F.

Daily low temperatures increase by 2°F, from 37°F to 39°F, rarely falling below 35°F or exceeding 42°F.

For reference, on February 6, the hottest day of the year, temperatures in Port-aux-Français typically range from 40°F to 47°F, while on August 10, the coldest day of the year, they range from 32°F to 37°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 Port-aux-Français18152229112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMNovJanvery coldcold
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 average hourly temperature, color coded into bands. The shaded overlays indicate night and civil twilight.

Akutan, Alaska, United States (10,094 miles away); Ólafsvík, Iceland (9,331 miles); and Vestmanna, Faroe Islands (8,797 miles) are the far-away foreign places with temperatures most similar to Port-aux-Français (view comparison).

Clouds

The month of December in Port-aux-Français experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 52% throughout the month.

The clearest day of the month is December 1, with clear, mostly clear, or partly cloudy conditions 49% of the time.

For reference, on April 21, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 60%, while on November 21, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 50%.

Cloud Cover Categories in December

Cloud Cover Categories in December in Port-aux-Français1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%NovJanDec 149%Dec 149%Dec 3147%Dec 3147%Dec 1148%Dec 1148%Dec 2147%Dec 2147%clearmostly clearpartly cloudymostly cloudyovercast
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds.

Precipitation

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Port-aux-Français, the chance of a wet day over the course of December is essentially constant, remaining around 31% throughout.

For reference, the year's highest daily chance of a wet day is 37% on May 22, and its lowest chance is 26% on October 9.

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 Port-aux-Français is essentially constant, remaining about 1.9 inches throughout, and rarely exceeding 3.0 inches or falling below 1.0 inches.

The highest average 31-day accumulation is 1.9 inches on December 26.

Average Monthly Rainfall in December

Average Monthly Rainfall in December in Port-aux-Français1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310.0 in0.0 in0.5 in0.5 in1.0 in1.0 in1.5 in1.5 in2.0 in2.0 in2.5 in2.5 in3.0 in3.0 inNovJanDec 261.9 inDec 261.9 inDec 11.8 inDec 11.8 inDec 111.9 inDec 111.9 in
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 Port-aux-Français, the length of the day is gradually increasing. From the start to the end of the month, the length of the day increases by 16 minutes, implying an average daily increase of 31 seconds, and weekly increase of 3 minutes, 40 seconds.

The shortest day of the month is December 1, with 15 hours, 55 minutes of daylight and the longest day is December 22, with 16 hours, 16 minutes of daylight.

Hours of Daylight and Twilight in December

Hours of Daylight and Twilight in December in Port-aux-Français1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hrNovJanDec 2116 hr, 16 minDec 2116 hr, 16 mindaydaydaydayDec 115 hr, 55 minDec 115 hr, 55 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 Port-aux-Français is 4:07 AM on December 12 and the latest sunrise is 9 minutes later at 4:16 AM on December 31.

The earliest sunset is 8:06 PM on December 1 and the latest sunset is 21 minutes later at 8:27 PM on December 30.

Daylight saving time is not observed in Port-aux-Français during 2021.

For reference, on December 21, the longest day of the year, the Sun rises at 4:09 AM and sets 16 hours, 16 minutes later, at 8:25 PM, while on June 21, the shortest day of the year, it rises at 8:15 AM and sets 8 hours, 10 minutes later, at 4:26 PM.

Sunrise & Sunset with Twilight in December

Sunrise & Sunset with Twilight in December in Port-aux-Français1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031312 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMNovJan4:07 AM4:07 AMDec 128:18 PMDec 128:18 PM4:15 AM4:15 AMDec 308:27 PMDec 308:27 PM4:10 AM4:10 AMDec 18:06 PMDec 18:06 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.

Moon

The figure below presents a compact representation of key lunar data for December 2021. 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.

Moon Rise, Set & Phases in December

Moon in Port-aux-Français18152229112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMNovJanNov 52:15 AMNov 52:15 AMNov 191:58 PMNov 191:58 PMDec 412:44 PMDec 412:44 PMDec 199:36 AMDec 199:36 AMJan 211:34 PMJan 211:34 PMJan 184:49 AMJan 184:49 AM5:00 AM5:00 AM8:15 PM8:15 PM7:56 PM7:56 PM4:44 AM4:44 AM3:54 AM3:54 AM8:35 PM8:35 PM3:50 AM3:50 AM3:12 AM3:12 AM8:37 PM8:37 PM8:30 PM8:30 PM4:21 AM4:21 AM
The time in which the moon is above the horizon (light blue area), with new moons (dark gray lines) and full moons (blue lines) indicated. The shaded overlays indicate night and civil twilight.

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 Port-aux-Français is essentially constant during December, remaining around 0% throughout.

Humidity Comfort Levels in December

Humidity Comfort Levels in December in Port-aux-Français1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%NovJanDec 10%Dec 10%Dec 310%Dec 310%Dec 110%Dec 110%Dec 210%Dec 210%drydry
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The percentage of time spent at various humidity comfort levels, categorized by dew point.

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 Port-aux-Français is gradually decreasing during December, decreasing from 23.3 miles per hour to 22.8 miles per hour over the course of the month.

For reference, on September 3, the windiest day of the year, the daily average wind speed is 25.7 miles per hour, while on February 16, the calmest day of the year, the daily average wind speed is 22.1 miles per hour.

The lowest daily average wind speed during December is 22.7 miles per hour on December 29.

Average Wind Speed in December

Average Wind Speed in December in Port-aux-Français1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310 mph0 mph5 mph5 mph10 mph10 mph15 mph15 mph20 mph20 mph25 mph25 mph30 mph30 mph35 mph35 mphNovJanDec 2922.7 mphDec 2922.7 mphDec 123.3 mphDec 123.3 mphDec 1623.0 mphDec 1623.0 mph
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The hourly average wind direction in Port-aux-Français throughout December is predominantly from the west, with a peak proportion of 73% on December 31.

Wind Direction in December

Wind Direction in December in Port-aux-Français1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%20%80%40%60%60%40%80%20%100%0%NovJanwestnorthsouth
northeastsouthwest
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions, excluding hours in which the mean wind speed is less than 1.0 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

Water Temperature

Port-aux-Français 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 in Port-aux-Français is essentially constant during December, remaining within 1°F of 39°F throughout.

Average Water Temperature in December

Average Water Temperature in December in Port-aux-Français18152229112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313136°F36°F37°F37°F38°F38°F39°F39°F40°F40°F41°F41°F42°F42°F43°F43°FNovJanDec 139°FDec 139°FDec 3140°FDec 3140°FDec 1139°FDec 1139°FDec 2140°FDec 2140°F
The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.

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 Port-aux-Français typically lasts for 6.9 months (210 days), from around October 30 to around May 28, rarely starting before October 7 or after November 20, and rarely ending before May 4 or after June 21.

The month of December in Port-aux-Français is reliably fully within 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 Port-aux-Français1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%NovJan100%Dec 16100%Dec 1690%Nov 2090%Nov 20very coldcold
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 percentage of time spent in various temperature bands. 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 Port-aux-Français are essentially constant during December, remaining around 0°F throughout.

Growing Degree Days in December

Growing Degree Days in December in Port-aux-Français1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310.0°F0.0°F0.1°F0.1°F0.2°F0.2°F0.3°F0.3°F0.4°F0.4°F0.5°F0.5°F0.6°F0.6°F0.7°F0.7°F0.8°F0.8°F0.9°F0.9°F1.0°F1.0°FNovJanDec 10°FDec 10°FDec 310°FDec 310°FDec 110°FDec 110°FDec 210°FDec 210°F
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 Port-aux-Français is essentially constant during December, remaining within 0.1 kWh of 6.1 kWh throughout.

The highest average daily incident shortwave solar energy during December is 6.2 kWh on December 16.

Average Daily Incident Shortwave Solar Energy in December

Average Daily Incident Shortwave Solar Energy in December in Port-aux-Français1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWh9 kWh9 kWhNovJanDec 166.2 kWhDec 166.2 kWhDec 16.0 kWhDec 16.0 kWhDec 316.2 kWhDec 316.2 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 Port-aux-Français are -49.350 deg latitude, 70.217 deg longitude, and 23 ft elevation.

The topography within 2 miles of Port-aux-Français contains only modest variations in elevation, with a maximum elevation change of 220 feet and an average elevation above sea level of 62 feet. Within 10 miles contains only modest variations in elevation (2,815 feet). Within 50 miles contains large variations in elevation (6,050 feet).

The area within 2 miles of Port-aux-Français is covered by water (41%), shrubs (24%), trees (16%), and grassland (12%), within 10 miles by water (45%) and bare soil (26%), and within 50 miles by water (79%) and bare soil (11%).

Data Sources

This report illustrates the typical weather in Port-aux-Français, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.

Port-aux-Français is further than 200 kilometers from the nearest reliable weather station, so the weather-related data on this page were taken entirely from NASA's MERRA-2 satellite-era reanalysis . 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.

The temperature and dew point estimates are corrected for the difference between the reference elevation of the MERRA-2 grid cell and the elevation of Port-aux-Français, according to the International Standard Atmosphere .

All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , by Jean Meeus.

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 airports 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.