Aruba weather by month

In Oranjestad, 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 4.1 months, ending around March 31. The clearest month is January, when the sky is clear, mostly clear, or partly cloudy 87% of the time on average.

The cloudier part of the year begins around April 1 and lasts for 3.7 months, ending around July 21. The cloudiest month is May, when it is overcast or mostly cloudy 64% 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 Oranjestad is typically windy, near 32 km/h, and varies a lot with the seasons.

The windier part of the year lasts 8.0 months, from around Dec 22 to Aug 21. The windiest month is June, averaging about 36 km/h (windy).

The calmer part of the year runs from around Aug 22 to Dec 21, with October the calmest month at about 26 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.

Oranjestad receives about 6.1 kWh/m² a day of solar energy on average — intense — with a clear seasonal swing between 4.9 and 6.7 kWh/m².

The brighter stretch of the year lasts 7.2 months, from around Feb 20 to Sep 25. The brightest month is August, averaging about 6.7 kWh/m² (intense).

The dimmest month is November, down near 5.0 kWh/m² — roughly 25% less than the August peak.