Cayman Islands weather by month

In George Town, 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 November 15 and lasts for 5.9 months, ending around May 13. The clearest month is March, when the sky is clear, mostly clear, or partly cloudy 90% of the time on average.

The cloudier part of the year begins around May 14 and lasts for 6.1 months, ending around November 14. The cloudiest month is June, 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 George Town is typically breezy, near 22 km/h, and varies moderately with the seasons.

The windier part of the year lasts 5.2 months, from around Oct 21 to Mar 26. The windiest month is November, averaging about 26 km/h (breezy).

The calmer part of the year runs from around Mar 27 to Oct 20, with September the calmest month at about 18 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.

George Town receives about 5.7 kWh/m² a day of solar energy on average — bright — with a clear seasonal swing between 4.2 and 6.8 kWh/m².

The brighter stretch of the year lasts 6.7 months, from around Mar 1 to Sep 19. The brightest month is April, averaging about 6.7 kWh/m² (intense).

The dimmest month is December, down near 4.3 kWh/m² — roughly 37% less than the April peak.