Guyana weather by month

In Georgetown, 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 July 25 and lasts for 3.2 months, ending around October 30. The clearest month is September, when the sky is clear, mostly clear, or partly cloudy 63% of the time on average.

The cloudier part of the year begins around April 5 and lasts for 3.6 months, ending around July 24. The cloudiest month is June, when it is overcast or mostly cloudy 77% 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 Georgetown is typically light breeze, near 13 km/h, and varies moderately with the seasons.

The windier part of the year lasts 5.3 months, from around Dec 15 to May 25. The windiest month is March, averaging about 16 km/h (light breeze).

The calmer part of the year runs from around May 26 to Dec 14, with July the calmest month at about 10 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.

Georgetown receives about 5.0 kWh/m² a day of solar energy on average — bright — with a clear seasonal swing between 4.2 and 5.8 kWh/m².

The brighter stretch of the year lasts 3.3 months, from around Jul 29 to Nov 4. The brightest month is September, averaging about 5.7 kWh/m² (bright).

The dimmest month is June, down near 4.3 kWh/m² — roughly 25% less than the September peak.