To cite package ‘fmi2’ in publications use:

  Lehtomaki J, Lahti L (2020). _fmi2: Finnish Meteorological Institute
  open data API R client_. R package version 0.2.0, ,
  <https://github.com/ropengov/fmi2>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {fmi2: Finnish Meteorological Institute open data API R client},
    author = {Joona Lehtomaki and Leo Lahti},
    year = {2020},
    note = {R package version 0.2.0, },
    url = {https://github.com/ropengov/fmi2},
  }