Royal Observatory former Great Equatorial Building

Local climate

Royal Observatory former Great Equatorial Building sits in one of the driest parts of the UK, with an average of 690 mm of rain a year. This makes it drier than 96% of listed buildings in the UK. Its exposure to wind-driven rain is lower than that of 99% of listed buildings.

It experiences an average of 34 freeze-thaw cycles a year, more than 52% of listed buildings. Of these, 15 follow at least 1 mm of rain in the preceding 48 hours. Average temperatures at this location have risen by 0.3°C per decade since 1991.

Averages for 1991–2020; temperature trend 1991–2025. Figures describe the wider area (a grid cell of roughly 10 km), not the individual site. Contains modified Copernicus Climate Change Service information 2026.