Nigeria weather by month

In Lagos, 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 28 and lasts for 4.6 months, ending around March 16. The clearest month is December, when the sky is clear, mostly clear, or partly cloudy 74% of the time on average.

The cloudier part of the year begins around March 17 and lasts for 7.4 months, ending around October 27. The cloudiest month is July, when it is overcast or mostly cloudy 91% 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 Lagos is typically calm, near 12 km/h, and varies moderately with the seasons.

The windier part of the year lasts 3.0 months, from around Jun 23 to Sep 20. The windiest month is August, averaging about 15 km/h (light breeze).

The calmer part of the year runs from around Sep 21 to Feb 1, with November the calmest month at about 9 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.

Lagos receives about 4.7 kWh/m² a day of solar energy on average — bright — with a clear seasonal swing between 3.9 and 5.4 kWh/m².

The brighter stretch of the year lasts 6.3 months, from around Nov 2 to May 11. The brightest month is February, averaging about 5.4 kWh/m² (bright).

The dimmest month is June, down near 4.0 kWh/m² — roughly 26% less than the February peak.