French Southern Territories weather by month

In Port-aux-Français, the average share of the sky covered by clouds shows moderate seasonal variation over the course of the year.

The clearer part of the year begins around April 16 and lasts for 5.8 months, ending around October 10. The clearest month is July, when the sky is clear, mostly clear, or partly cloudy 34% of the time on average.

The cloudier part of the year begins around October 11 and lasts for 6.1 months, ending around April 15. The cloudiest month is January, when it is overcast or mostly cloudy 82% of the time.

This is the average sustained wind speed at the standard 10 metres above open ground — the steady flow a weather station reports, not the sharper gusts that come and go, which can run half again as fast. It's the number that says whether a place is generally breezy or calm.

Across the year, average wind speed in Port-aux-Français is typically breezy, near 26 km/h, and varies little with the seasons.

The windier part of the year lasts 5.0 months, from around Jul 12 to Dec 11. The windiest month is October, averaging about 28 km/h (breezy).

The calmer part of the year runs from around Jan 24 to Jul 11, with June the calmest month at about 25 km/h.

Solar energy is how much sunlight actually reaches the ground each day, measured in kilowatt-hours per square metre (kWh/m²) — the combined effect of how long the sun is up, how high it climbs, and how much cloud gets in the way. It's the raw fuel a solar panel has to work with: for scale, 1 kWh/m² a day is dim and wintry, while 7+ is desert-bright.

Port-aux-Français receives about 3.2 kWh/m² a day of solar energy on average — moderate — with a clear seasonal swing between 0.8 and 5.9 kWh/m².

The brighter stretch of the year lasts 5.8 months, from around Sep 19 to Mar 15. The brightest month is December, averaging about 5.8 kWh/m² (bright).

The dimmest month is June, down near 0.9 kWh/m² — roughly 85% less than the December peak.