A lot more about Meteorological Institute's history on Jan Mayen can be read at http://home.online.no/~vteigen/ (partly in Norwegian).
The Norwegian Meteorological Institute has been observing the weather on Jan Mayen since 1921. Back then the station (which is now called Eldstemetten or "The Oldest Met") was located in the Jameson bay, east of Eggøya. This station was burnt down and evacuated when the war started, but people was back already the following year to resume the measurements.
"Eldstemetten", the first met station, located at the east side of Jan Mayen. The Egg Island in background (1921-1940)
"Metten", today's met
(1960 - present)