Phenological data on the start and end of the flight season of European damselflies

Data on the day of the year when the flight season of 15 European species of damselfies start ("Spring") and end ("Fall") based on literature records. Literature refererence IDs ("Ref") correspond to numbers used in Appendix B of the corresponding article and the records are graded from 1 to 4 based on their quality ("Quality"), with 4 being the most reliable.