WAS and and the Universidad Complutense de Madrid (UCM) have a photometer installed at the Gifford Observatory to measure sky brightness and cloud cover.  This is part of a world wide network of photometers to measure light pollution.

You can see the output of the Wellington photometer at http://tess-dashboards.stars4all.eu/d/I_akY0Fmz/s4a-photometer-network-new-zealand?orgId=1&var-Sun_Moon=Sun%20(New%20Zealand)%20Wellington