Ionisation measurements and recordings of the atmospheric electric potential gradient (PG) have been made simultaneously from Sodankylä, Finland in order to study the relationships between atmospheric electricity and surface radioactivity.  This dataset provides hourly median values of radon activity concentration (Rn-222) (in Bq/m3) and gamma dose rate (µGy/h).  PG measured by an electric field mill is also provided at hourly resolution. The dataset spans the years 2018-2022.