Curacao weather by month

In Willemstad, 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 26 and lasts for 4.0 months, ending around March 28. The clearest month is January, when the sky is clear, mostly clear, or partly cloudy 84% of the time on average.

The cloudier part of the year begins around March 29 and lasts for 3.7 months, ending around July 20. The cloudiest month is May, when it is overcast or mostly cloudy 67% 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 Willemstad is typically windy, near 30 km/h, and varies moderately with the seasons.

The windier part of the year lasts 7.9 months, from around Dec 25 to Aug 21. The windiest month is June, averaging about 33 km/h (windy).

The calmer part of the year runs from around Aug 22 to Dec 24, with October the calmest month at about 25 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.

Willemstad receives about 5.9 kWh/m² a day of solar energy on average — bright — with a clear seasonal swing between 4.9 and 6.5 kWh/m².

The brighter stretch of the year lasts 7.3 months, from around Feb 19 to Sep 28. The brightest month is August, averaging about 6.5 kWh/m² (intense).

The dimmest month is December, down near 4.9 kWh/m² — roughly 24% less than the August peak.