Average Weather in Port-aux-Français French Southern Territories
In Port-aux-Français, the summers are short, cold, and mostly cloudy; the winters are long, very cold, and partly cloudy; and it is extremely windy year round. Over the course of the year, the temperature typically varies from 32°F to 47°F and is rarely below 29°F or above 51°F.
Based on the tourism score, the best time of year to visit Port-aux-Français for warm-weather activities is from late January to late February.
The warm season lasts for 3.0 months, from December 28 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 4.3 months, 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 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
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).
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 31 and lasts for 5.6 months, 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 6.4 months, ending around August 31. 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 Categories
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 8.2 months, 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 3.8 months, 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
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 of 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 an average total accumulation of 1.4 inches.
Average Monthly Rainfall
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 length of the day in Port-aux-Français varies extremely over the course of the year. In 2018, the shortest day is June 21, with 8 hours, 10 minutes of daylight; the longest day is December 22, with 16 hours, 16 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 4:07 AM on December 13, 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 31.
Daylight saving time (DST) is not observed in Port-aux-Français during 2018.
Sunrise & Sunset with Twilight
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
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 significant seasonal variation over the course of the year.
The windier part of the year lasts for 4.4 months, from June 29 to November 10, with average wind speeds of more than 23.9 miles per hour. The windiest day of the year is September 3, with an average hourly wind speed of 25.7 miles per hour.
The calmer time of year lasts for 7.6 months, from November 10 to June 29. The calmest day of the year is February 16, with an average hourly wind speed of 22.1 miles per hour.
Average Wind Speed
The predominant average hourly wind direction in Port-aux-Français is from the west throughout the year.
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 3.5 months, from January 13 to April 30, 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 4.0 months, from July 9 to November 8, 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
Best Time of Year to Visit
To characterize how pleasant the weather is in Port-aux-Français throughout the year, we compute two travel scores.
The tourism score favors clear, rainless days with perceived temperatures between 65°F and 80°F. Based on this score, the best time of year to visit Port-aux-Français for general outdoor tourist activities is from late January to late February, with a peak score in the third week of February.
The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F.
For each hour between 8:00 AM and 9:00 PM of each day in the analysis period (1980 to 2016), independent scores are computed for perceived temperature, cloud cover, and total precipitation. Those scores are combined into a single hourly composite score, which is then aggregated into days, averaged over all the years in the analysis period, and smoothed.
Our cloud cover score is 10 for fully clear skies, falling linearly to 9 for mostly clear skies, and to 1 for fully overcast skies.
Our precipitation score, which is based on the three-hour precipitation centered on the hour in question, is 10 for no precipitation, falling linearly to 9 for trace precipitation, and to 0 for 0.04 inches of precipitation or more.
Our tourism temperature score is 0 for perceived temperatures below 50°F, rising linearly to 9 for 65°F, to 10 for 75°F, falling linearly to 9 for 80°F, and to 1 for 90°F or hotter.
Our beach/pool temperature score is 0 for perceived temperatures below 65°F, rising linearly to 9 for 75°F, to 10 for 82°F, falling linearly to 9 for 90°F, and to 1 for 100°F or hotter.
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.
Time Spent in Various Temperature Bands and 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.
Growing Degree Days
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 extreme seasonal variation over the course of the year.
The brighter period of the year lasts for 3.1 months, from November 9 to February 13, 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 4.2 months, from April 20 to August 25, 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
For the purposes of this report, the geographical coordinates of Port-aux-Français are -49.350 deg latitude, 70.217 deg longitude, and 59 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%).
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 .
Maps are © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.
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.