Chad weather by month

In N'Djamena, the average share of the sky covered by clouds shows significant seasonal variation over the course of the year.

The clearer part of the year begins around October 3 and lasts for 8.6 months, ending around June 22. The clearest month is December, when the sky is clear, mostly clear, or partly cloudy 80% of the time on average.

The cloudier part of the year begins around June 23 and lasts for 3.4 months, ending around October 2. The cloudiest month is August, when it is overcast or mostly cloudy 74% 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 N'Djamena is typically calm, near 10 km/h, and varies moderately with the seasons.

The windier part of the year lasts 5.5 months, from around Nov 4 to Apr 19. The windiest month is March, averaging about 13 km/h (light breeze).

The calmer part of the year runs from around Apr 20 to Nov 3, with September the calmest month at about 7 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.

N'Djamena receives about 6.2 kWh/m² a day of solar energy on average — intense — with a clear seasonal swing between 5.2 and 7.3 kWh/m².

The brighter stretch of the year lasts 4.7 months, from around Jan 27 to Jun 17. The brightest month is April, averaging about 7.1 kWh/m² (intense).

The dimmest month is August, down near 5.3 kWh/m² — roughly 25% less than the April peak.