Pitcairn weather by month

In Adamstown, the average share of the sky covered by clouds shows moderate seasonal variation over the course of the year.

The clearer part of the year begins around January 2 and lasts for 3.3 months, ending around April 11. The clearest month is March, when the sky is clear, mostly clear, or partly cloudy 56% of the time on average.

The cloudier part of the year begins around September 3 and lasts for 4.0 months, ending around January 1. The cloudiest month is November, when it is overcast or mostly cloudy 65% 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 Adamstown is typically breezy, near 23 km/h, and varies moderately with the seasons.

The windier part of the year lasts 6.4 months, from around Apr 19 to Oct 30. The windiest month is July, averaging about 26 km/h (breezy).

The calmer part of the year runs from around Oct 31 to Apr 18, with February the calmest month at about 20 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.

Adamstown receives about 5.1 kWh/m² a day of solar energy on average — bright — with a clear seasonal swing between 3.0 and 6.9 kWh/m².

The brighter stretch of the year lasts 6.2 months, from around Sep 23 to Mar 31. The brightest month is January, averaging about 6.9 kWh/m² (intense).

The dimmest month is June, down near 3.1 kWh/m² — roughly 56% less than the January peak.