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cff-version: 1.2.0
message: 'To cite package "varunayan" in publications use:'
type: software
license: MIT
title: 'varunayan: Download and Process ERA5, IMD, HadEX3 and CRU TS Climate Data'
version: 0.2.0
doi: 10.32614/CRAN.package.varunayan
abstract: 'Download and process climate data for custom geographical regions defined
  by bounding boxes, ''GeoJSON'' polygons, or point coordinates. Supports the fifth
  generation European Centre for Medium-Range Weather Forecasts atmospheric reanalysis
  (''ERA5''; Hersbach et al. (2020) <https://doi.org/10.1002/qj.3803>) from the ''Copernicus''
  Climate Data Store (CDS) <https://cds.climate.copernicus.eu/>, India Meteorological
  Department (IMD) gridded rainfall and temperature (Pai et al. (2014) <https://doi.org/10.54302/mausam.v65i1.851>),
  Hadley Centre global land climate extremes indices version 3 (''HadEX3''; Dunn et
  al. (2020) <https://doi.org/10.1029/2019JD032263>), and Climatic Research Unit gridded
  Time Series (''CRU TS''; Harris et al. (2020) <https://doi.org/10.1038/s41597-020-0453-3>).
  Also computes heat stress indices including heat index, wet-bulb temperature, outdoor
  wet-bulb globe temperature (Liljegren et al. (2008) <https://doi.org/10.1080/15459620802310770>)
  and the Universal Thermal Climate Index (Bröde et al. (2012) <https://doi.org/10.1007/s00484-011-0454-1>),
  and heat exposure indicators for health studies: heatwave and warm-night frequency
  and duration under India Meteorological Department and percentile definitions, the
  Excess Heat Factor (Nairn and Fawcett (2015) <https://doi.org/10.3390/ijerph120100227>)
  and diurnal temperature range.'
authors:
- family-names: Choudhary
  given-names: Saket
  email: saketc@iitb.ac.in
  orcid: https://orcid.org/0000-0001-5202-7633
- family-names: Nehal
  given-names: Darakhshan
repository: https://saketlab.r-universe.dev
repository-code: https://github.com/saketlab/varunayanR
commit: 4a294632424defd72ad8e0834c49ab1833e5f10b
url: https://varunayan.saketlab.org/R/
date-released: '2026-10-12'
contact:
- family-names: Choudhary
  given-names: Saket
  email: saketc@iitb.ac.in
  orcid: https://orcid.org/0000-0001-5202-7633