Ghana weather by month

In Kumasi, 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 14 and lasts for 5.1 months, ending around March 16. The clearest month is December, when the sky is clear, mostly clear, or partly cloudy 71% of the time on average.

The cloudier part of the year begins around March 17 and lasts for 6.9 months, ending around October 13. The cloudiest month is August, when it is overcast or mostly cloudy 94% 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 Kumasi is typically calm, near 8 km/h, and varies little with the seasons.

The windier part of the year lasts 6.9 months, from around Feb 15 to Sep 11. The windiest month is August, averaging about 9 km/h (calm).

The calmer part of the year runs from around Sep 12 to Feb 14, with October the calmest month at about 6 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.

Kumasi receives about 4.8 kWh/m² a day of solar energy on average — bright — with a clear seasonal swing between 3.8 and 5.5 kWh/m².

The brighter stretch of the year lasts 5.8 months, from around Nov 30 to May 24. The brightest month is February, averaging about 5.5 kWh/m² (bright).

The dimmest month is August, down near 3.8 kWh/m² — roughly 31% less than the February peak.