Meteorological observations have been systematically conducted in Teigarhorn since 1881, making Teigarhorn the second oldest meteorologic site in Iceland and therefor an important part of the history of meteorological observations in Iceland. The highest temperature ever recorded in Iceland was 30.5°C in Teigarhorn on 22 June 1939.

Daily rainfall observations are still done in Teigarhorn by the ranger. The measurements are available here.