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Average Weather in Port-aux-Français French Southern Territories

Port-aux-Français has a non-polar tundra climate. The temperature typically varies from 32°F to 47°F over the course of the year, and is rarely below 29°F or above 51°F.

The warm season lasts for 91 days, from December 27 to March 28, with an average daily high temperature above 45°F. The hottest day of the year is February 6, with an average high of 47°F and low of 40°F.

The cool season lasts for 133 days, from June 5 to October 16, with an average daily high temperature below 39°F. The coldest day of the year is August 10, with an average low of 32°F and high of 37°F.

Average High and Low Temperature

The daily average high (red line) and low (blue line) temperature with percentile bands, 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 entire year of hourly average temperatures. The horizontal axis is the day of the year, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.

Average Hourly Temperature

12 AM4 AM8 AM12 PM4 PM8 PM12 AMJanFebMarAprMayJunJulAugSepOctNovDecchillychillycoldcold
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.

Sun

The length of the day in Port-aux-Français varies extremely over the course of the year. In 2017, the shortest day is June 21, with 8 hours, 10 minutes of daylight; the longest day is December 21, with 16 hours, 16 minutes of daylight.

Hours of Daylight and Twilight

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 is at 4:07 AM on December 12, and the latest sunrise is 4 hours, 9 minutes later at 8:16 AM on June 26. The earliest sunset is at 4:25 PM on June 16, and the latest sunset is 4 hours, 2 minutes later at 8:27 PM on December 30.

Daylight saving time (DST) is not observed in Port-aux-Français during 2017.

Sunrise & Sunset with Twilight

The solar day over the course of the year 2017. 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.

Clouds

In Port-aux-Français, the average percentage of the sky covered by clouds experiences mild seasonal variation over the course of the year.

The clearer part of the year in Port-aux-Français begins around August 30 and lasts for 171 days, ending around February 17. On November 21, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 50% of the time, and overcast or mostly cloudy 50% of the time.

The cloudier part of the year begins around February 17 and lasts for 194 days, ending around August 30. On April 21, the cloudiest day of the year, the sky is overcast or mostly cloudy 60% of the time, and clear, mostly clear, or partly cloudy 40% of the time.

Cloud Cover

clearerclearerclearerclearercloudiercloudier0%10%20%30%40%50%60%70%80%90%100%JanFebMarAprMayJunJulAugSepOctNovDecApr 2160%Apr 2160%Nov 2150%Nov 2150%Aug 3055%Aug 3055%Feb 1755%Feb 1755%overcastovercastmostly cloudymostly cloudypartly cloudypartly cloudymostly clearmostly clearclearclear
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. The chance of wet days in Port-aux-Français varies throughout the year.

The wetter season lasts 248 days, from December 8 to August 13, with a greater than 31% chance of a given day being a wet day. The chance of a wet day peaks at 37% on May 22.

The drier season lasts 117 days, from August 13 to December 8. The smallest chance of a wet day is 26% on October 9.

Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 36% on May 22.

Daily Chance of Precipitation

wetwetwetwetdrydry0%10%20%30%40%50%60%70%80%90%100%JanFebMarAprMayJunJulAugSepOctNovDecMay 2237%May 2237%Oct 926%Oct 926%Jan 130%Jan 130%Aug 1331%Aug 1331%mixedmixedrainrain
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 months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day in the year. Port-aux-Français experiences some seasonal variation in monthly rainfall.

Rain falls throughout the year in Port-aux-Français. The most rain falls during the 31 days centered around March 29, with an average total accumulation of 2.3 inches.

The least rain falls around October 2, with and average total accumulation of 1.4 inches.

Average Monthly Rainfall

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.

Snowfall

The sliding 31-day liquid-equivalent quantity of snowfall in Port-aux-Français does not vary significantly over the course of the year, staying within 0.1 inches of 0.1 inches throughout.

Average Liquid-Equivalent Monthly Snowfall

The average liquid-equivalent snowfall (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 rainfall.

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 perceived humidity level in Port-aux-Français, as measured by the percentage of time in which the humidity comfort level is muggy, oppressive, or miserable, does not vary significantly over the course of the year, remaining a virtually constant 0% throughout.

Humidity Comfort Levels

0%10%20%30%40%50%60%70%80%90%100%JanFebMarAprMayJunJulAugSepOctNovDecJul 30%Jul 30%drydry
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 Port-aux-Français experiences mildly seasonal variation over the course of the year.

The windier part of the year lasts for 135 days, from June 29 to November 11, with average wind speeds of more than 12.9 miles per hour. The windiest day of the year is September 3, with an average hourly wind speed of 13.9 miles per hour.

The calmer time of year lasts for 230 days, from November 11 to June 29. The calmest day of the year is February 16, with an average hourly wind speed of 12.0 miles per hour.

Average Wind Speed

The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The predominant average hourly wind direction in Port-aux-Français is from the west throughout the year.

Wind Direction

0%20%40%60%80%100%JanFebMarAprMayJunJulAugSepOctNovDecwestwestsouthsouthnorthnorth
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).

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 water temperature experiences some seasonal variation over the course of the year.

The time of year with warmer water lasts for 108 days, from January 13 to May 1, with an average temperature above 41°F. The day of the year with the warmest water is February 25, with an average temperature of 42°F.

The time of year with cooler water lasts for 124 days, from July 8 to November 9, with an average temperature below 37°F. The day of the year with the coolest water is September 6, with an average temperature of 36°F.

Average Water Temperature

The daily average water temperature (purple line) with percentile bands, 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 experiences very significant seasonal variation over the course of the year.

The brighter period of the year lasts for 98 days, from November 8 to February 14, with an average daily incident shortwave energy per square meter above 5.1 kWh. The brightest day of the year is December 16, with an average of 6.2 kWh.

The darker period of the year lasts for 129 days, from April 19 to August 26, with an average daily incident shortwave energy per square meter below 1.8 kWh. The darkest day of the year is June 21, with an average of 0.7 kWh.

Average Daily Incident Shortwave Solar Energy

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

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%).

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 large variations in elevation (2,815 feet). Within 50 miles contains extreme variations in elevation (6,050 feet).

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 Tables of the Sun, Moon and Planets , 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 aiports and weather stations are provided by AskGeo.com .