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Mount John Observatory Tekapo
Mount John Observatory Tekapo
Wananga Landing
Topic

Weather at Mt John Observatory

04 December 2025

The Mount John Observatory can experience extreme weather conditions. Learn about the weather at Mt John Observatory and be prepared.

HOW TO APPLY

At 1019 metres the weather poses hazards seldom encountered at lower altitudes.

Winds can come up fast, sometimes to gale speeds.

Never leave a dome open unattended. Wind can also rotate closed domes.

Don't leave doors and windows open unattended. 
It is wise to carry warmer clothing if possible when out for a walk.

 

Snow: may build up quickly on the road surface especially if it is cold (an overcast winter day) and present a hazard for leaving or returning to the Observatory. Plan excursions with the weather forecast in mind.

 

Ice: forms on the sealed area especially just outside the dormitory doors. Take care with footing there. Prevent the formation of icy patches by shovelling away the snow around the doors BEFORE anyone walks on it -- footprints will be preserved much longer than deserved by you, or your unwary colleagues... Ice builds up in shady places. Be very careful if exiting the 1-m building by the door at the south end of the dormitory passage. Also watch for ice at side door of the garage.

 

Cars: should have antifreeze in the radiator whatever season.

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