To cite the climate package in publications, please use:

  Czernecki, B.; Głogowski, A.; Nowosad, J. Climate: An R Package to
  Access Free In-Situ Meteorological and Hydrological Datasets for
  Environmental Assessment. Sustainability 2020, 12, 394.
  https://doi.org/10.3390/su12010394

A BibTeX entry for LaTeX users is

  @Article{,
    author = {Bartosz Czernecki and Arkadiusz Głogowski and Jakub Nowosad},
    journal = {Sustainability},
    title = {Climate: An R Package to Access Free In-Situ Meteorological and Hydrological Datasets For Environmental Assessment},
    year = {2020},
    pages = {394},
    volume = {12},
    doi = {10.3390/su12010394},
  }