Unified Climate Indices for Temperature, Precipitation, and Drought R package climatekit version 0.2.0 Compute the standard suite of climate indices from daily weather observations. Provides the canonical 'ETCCDI' 27 (Expert Team on Climate Change Detection and Indices), the 'ET-SCI' heatwave and cold-wave families plus the Excess Heat Factor of Nairn and Fawcett (2013), and agroclimatic, drought, and human-comfort families. Drought indices ('SPI', 'SPEI') accept a choice of distribution (gamma or Pearson III for SPI; log-logistic or generalised extreme value for SPEI). Reference evapotranspiration is available via Hargreaves and the FAO-56 Penman-Monteith method (Allen et al. 1998). Percentile-based indices support the Zhang (2005) in-base bootstrap. Daily inputs are numeric vectors plus a 'Date' vector; outputs are tidy data frames. Optional gridded support via 'terra' applies any index over a 'SpatRaster' and reads 'netCDF' input. No external API calls; pairs with data packages such as 'readnoaa'. References: Alexander et al. (2006) <doi:10.1029/2005JD006290>; Zhang et al. (2011) <doi:10.1002/wcc.147>; Zhang et al. (2005) <doi:10.1175/JCLI3366.1>. Software Depends: R (>= 4.1.0) Imports: cli (>= 3.6.0), stats, tools Suggests: testthat (>= 3.0.0), terra, ncdf4, knitr, rmarkdown Charles Coverdale <charlesfcoverdale@gmail.com> Comprehensive R Archive Network (CRAN) Charles Coverdale [aut, cre] MIT + file LICENSE (https://CRAN.R-project.org/package=climatekit/LICENSE) 2026-05-09 application/tgz https://CRAN.R-project.org/package=climatekit doi:10.32614/CRAN.package.climatekit en-GB