chillR
Statistical Methods for Phenology Analysis in Temperate Fruit Trees
Description
The phenology of plants (i.e. the timing of their annual life phases) depends on climatic cues. For temperate trees and many other plants, spring phases, such as leaf emergence and flowering, have been found to result from the effects of both cool (chilling) conditions and heat. Fruit tree scientists (pomologists) have developed some metrics to quantify chilling and heat (e.g. see Luedeling (2012) <doi:10.1016/j.scienta.2012.07.011>). 'chillR' contains functions for processing temperature records into chilling (Chilling Hours, Utah Chill Units and Chill Portions) and heat units (Growing Degree Hours). Regarding chilling metrics, Chill Portions are often considered the most promising, but they are difficult to calculate. This package makes it easy. 'chillR' also contains procedures for conducting a PLS analysis relating phenological dates (e.g. bloom dates) to either mean temperatures or mean chill and heat accumulation rates, based on long-term weather and phenology records (Luedeling and Gassner (2012) <doi:10.1016/j.agrformet.2011.10.020>). As of version 0.65, it also includes functions for generating weather scenarios with a weather generator, for conducting climate change analyses for temperature-based climatic metrics and for plotting results from such analyses. Since version 0.70, 'chillR' contains a function for interpolating hourly temperature records.
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CRAN Check Status
Show all 13 flavors
| Flavor | Status |
|---|---|
| r-devel-linux-x86_64-debian-clang | OK |
| r-devel-linux-x86_64-debian-gcc | OK |
| r-devel-linux-x86_64-fedora-clang | OK |
| r-devel-linux-x86_64-fedora-gcc | OK |
| r-devel-windows-x86_64 | OK |
| r-oldrel-macos-arm64 | OK |
| r-oldrel-macos-x86_64 | OK |
| r-oldrel-windows-x86_64 | OK |
| r-patched-linux-x86_64 | OK |
| r-release-linux-x86_64 | OK |
| r-release-macos-arm64 | OK |
| r-release-macos-x86_64 | OK |
| r-release-windows-x86_64 | OK |
Check History
OK 13 OK · 0 NOTE · 0 WARNING · 0 ERROR · 0 FAILURE Jun 9, 2026
ERROR 12 OK · 0 NOTE · 0 WARNING · 1 ERROR · 0 FAILURE Jun 8, 2026
PDF version of manual
Rd conversion errors: Converting parsed Rd's to LaTeX .......Warning in file(out, "wt") : cannot open file '/tmp/RtmpdakcDp/ltx37dcec66576217/handle_gsod.tex': No space left on device Error in file(out, "wt") : cannot open the connection
OK 13 OK · 0 NOTE · 0 WARNING · 0 ERROR · 0 FAILURE May 20, 2026
ERROR 12 OK · 0 NOTE · 0 WARNING · 1 ERROR · 0 FAILURE May 19, 2026
re-building of vignette outputs
Error(s) in re-building vignettes: --- re-building ‘PhenoFlex.Rmd’ using rmarkdown --- finished re-building ‘PhenoFlex.Rmd’ --- re-building ‘hourly_temperatures.Rmd’ using rmarkdown Quitting from hourly_temperatures.Rmd:25-25 ~~~~~~~~~~~~~~~~~~~~~~ ...[truncated]... emperatures.Rmd' failed with diagnostics: object 'KA_weather' not found --- failed re-building ‘hourly_temperatures.Rmd’ SUMMARY: processing the following file failed: ‘hourly_temperatures.Rmd’ Error: Vignette re-building failed. Execution halted
OK 14 OK · 0 NOTE · 0 WARNING · 0 ERROR · 0 FAILURE Apr 22, 2026
ERROR 13 OK · 0 NOTE · 0 WARNING · 1 ERROR · 0 FAILURE Apr 18, 2026
whether package can be installed
Installation failed. See 'd:/Rcompile/CRANpkg/local/4.6/chillR.Rcheck/00install.out' for details.