Cuba weather by month

In Havana, 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 January 18 and lasts for 4.1 months, ending around May 23. The clearest month is April, when the sky is clear, mostly clear, or partly cloudy 81% of the time on average.

The cloudier part of the year begins around May 24 and lasts for 5.4 months, ending around November 2. The cloudiest month is September, when it is overcast or mostly cloudy 52% 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 Havana is typically light breeze, near 19 km/h, and varies moderately with the seasons.

The windier part of the year lasts 7.0 months, from around Oct 13 to May 12. The windiest month is November, averaging about 22 km/h (breezy).

The calmer part of the year runs from around May 13 to Oct 12, with August the calmest month at about 16 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.

Havana receives about 5.5 kWh/m² a day of solar energy on average — bright — with a clear seasonal swing between 3.7 and 6.8 kWh/m².

The brighter stretch of the year lasts 6.4 months, from around Mar 6 to Sep 17. The brightest month is May, averaging about 6.6 kWh/m² (intense).

The dimmest month is December, down near 3.7 kWh/m² — roughly 44% less than the May peak.