seNorge/TNa: daily minimum temperature over Norway

seNorge_2018 is a collection of observational gridded datasets for the Norwegian mainland. This dataset contains the daily minimum temperature (TNa) fields for the 66-year time period 1957-2022. TNa is the minimum temperature without checking for consistency with TG/TM/TX. The grid spacing is 1 km. The data sources are: the Norwegian Meteorological Institute Climate Database, the Swedish Meteorological and Hydrological Institute Open Data API, the Finnish Meteorological Institute open data API and the European Climate Assessment & Dataset (www.ecad.eu). See also: https://github.com/metno/seNorge_docs/wiki/seNorge_2018