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chillR
View on CRAN: Click
here
Download and install chillR package within the R console
Install from CRAN:
install.packages("chillR")
Install from Github:
library("remotes")
install_github("cran/chillR") Install by package version:
library("remotes")
install_version("chillR", "0.77") Attach the package and use:
library("chillR")
Maintained by
Eike Luedeling
[Scholar Profile | Author Map]
[Scholar Profile | Author Map]
All associated links for this package
First Published: 2013-05-16
Latest Update: 2024-11-14
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) ).
'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) ).
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.
How to cite:
Eike Luedeling (2013). chillR: Statistical Methods for Phenology Analysis in Temperate Fruit Trees. R package version 0.77, https://cran.r-project.org/web/packages/chillR. Accessed 29 Oct. 2026.
Previous versions and publish date:
(2026-07-09 07:25), 0.54 (2013-05-16 21:50), 0.55 (2015-04-15 12:38), 0.60 (2016-03-08 06:22), 0.62 (2016-03-12 09:36), 0.65 (2017-01-23 13:49), 0.66 (2017-03-24 14:28), 0.70.0 (2018-01-04 15:55), 0.70.1 (2018-01-06 00:53), 0.70.2 (2018-01-06 23:34), 0.70.6 (2018-06-29 16:55), 0.70.12 (2018-12-18 23:00), 0.70.14 (2019-02-16 00:40), 0.70.15 (2019-03-05 20:00), 0.70.17 (2019-05-26 10:00), 0.70.21 (2019-11-05 22:20), 0.70.24 (2020-05-03 23:40), 0.72.2 (2021-01-06 18:40), 0.72.4 (2021-05-13 11:42), 0.72.5 (2021-10-14 17:50), 0.72.6 (2021-12-05 19:00), 0.72.7 (2022-01-11 13:32), 0.72.8 (2022-08-18 00:10), 0.72 (2020-12-10 20:50), 0.73.1 (2023-08-12 01:00), 0.74.1 (2023-11-19 17:20), 0.74 (2023-11-03 21:20), 0.75 (2023-11-27 23:20), 0.76 (2024-11-14 10:40)
Other packages that cited chillR R package
View chillR citation profile
Other R packages that chillR depends,
imports, suggests or enhances
Complete documentation for chillR
Functions, R codes and Examples using
the chillR R package
Some associated functions: Chilling_Hours . ChuineCF . ChuineFstar . Date2YEARMODA . DynModel_driver . Dynamic_Model . Empirical_daily_temperature_curve . Empirical_hourly_temperatures . GDD . GDH . GDH_model . JDay_count . JDay_earlier . JDay_later . KA_bloom . KA_weather . PLS_chill_force . PLS_pheno . PhenoFlex . PhenoFlex_GAUSSwrapper . PhenoFlex_GDHwrapper . PhenoFlex_fixedDynModelGAUSSwrapper . PhenoFlex_fixedDynModelwrapper . RMSEP . RPD . RPIQ . StepChill_Wrapper . UniChill_Wrapper . UniForce_Wrapper . UnifiedModel_Wrapper . Utah_Model . VIP . Winters_hours_gaps . YEARMODA2Date . add_date . bloom_prediction . bloom_prediction2 . bloom_prediction3 . bootstrap.phenologyFit . c.bootstrap_phenologyFit . california_stations . check_temperature_record . check_temperature_scenario . chifull . chile_agromet2chillR . chillR-package . chilling . chilling_hourtable . color_bar_maker . convert_scen_information . daily_chill . daylength . download_baseline_cmip6_ecmwfr . download_cmip6_ecmwfr . extract_cmip6_data . extract_differences_between_characters . extract_temperatures_from_grids . filter_temperatures . fix_weather . genSeason . genSeasonList . gen_rel_change_scenario . getClimateWizardData . getClimateWizard_scenarios . get_last_date . get_weather . handle_cimis . handle_dwd . handle_dwd_old . handle_gsod . handle_gsod_old . handle_ucipm . identify_common_string . interpolate_gaps . interpolate_gaps_hourly . leap_year . load_ClimateWizard_scenarios . load_temperature_scenarios . make_JDay . make_all_day_table . make_california_UCIPM_station_list . make_chill_plot . make_climate_scenario . make_climate_scenario_from_files . make_daily_chill_figures . make_daily_chill_plot . make_daily_chill_plot2 . make_hourly_temps . make_multi_pheno_trend_plot . make_pheno_trend_plot . ordered_climate_list . patch_daily_temperatures . patch_daily_temps . phenologyFit . phenologyFitter . plot.bootstrap_phenologyFit . plot.phenologyFit . plot_PLS . plot_climateWizard_scenarios . plot_climate_scenarios . plot_phenology_trends . plot_scenarios . predict.bootstrap_phenologyFit . predict.phenologyFit . print.phenologyFit . read_tab . runn_mean . runn_mean_pred . save_temperature_scenarios . select_by_file_extension . stack_hourly_temps . stage_transitions . step_model . summary.bootstrap_phenologyFit . summary.phenologyFit . tempResponse . tempResponse_daily_list . tempResponse_hourtable . temperature_generation . temperature_scenario_baseline_adjustment . temperature_scenario_from_records . test_if_equal . weather2chillR .
Some associated R codes: Date2YEARMODA.R . Empirical_temperature_curve.R . PLS_chill_force.R . PLS_pheno.R . RMSEP_RPD.R . RcppExports.R . UnifiedModel.R . VIP.R . YEARMODA2Date.R . add_date.R . before_after_JDay.R . bloom_prediction.R . bloom_prediction2.R . bloom_prediction3.R . bootstrap_phenologyFit.R . check_temperature_record.R . check_temperature_scenario.R . chile_agromet2chillR.R . chillR-package.R . chilling.R . chilling_hourtable.R . color_bar_maker.R . convert_scen_information.R . daily_chill.R . daylength.R . download_baseline_cmip6_ecmwfr.R . download_cmip6_ecmwfr.R . extract_cmip6_data.R . extract_differences_between_characters.R . extract_temperatures_from_grids.R . filter_temperatures.R . fix_weather.R . genSeason.R . gen_rel_change_scenario.R . getClimateWizardData.R . getClimateWizard_scenarios.R . get_last_date.R . get_weather.R . globals.R . handle_cimis.R . handle_dwd.R . handle_dwd_old.R . handle_gsod.R . handle_gsod_old.R . handle_ucipm.R . identify_common_string.R . interpolate_gaps.R . interpolate_gaps_hourly.R . leap_year.R . make_JDay.R . make_all_day_table.R . make_california_UCIPM_station_list.R . make_chill_plot.R . make_climate_scenario.R . make_climate_scenario_from_files.R . make_daily_chill_figures.R . make_daily_chill_plot.R . make_hourly_temps.R . make_multi_pheno_trend_plot.R . make_pheno_trend_plot.R . ordered_climate_list.R . patch_daily_temperatures.R . patch_daily_temps.R . phenologyFitter.R . plot_climate_scenarios.R . plot_pheno_results.R . plot_phenology_trends.R . plot_scenarios.R . read_tab.R . runn_mean.R . save_temperature_scenarios.R . select_by_file_extension.R . stack_hourly_temps.R . stage_transitions.R . tempResponse.R . tempResponse_daily_list.R . tempResponse_hourtable.R . temp_models.R . temperature_generation.R . temperature_scenario_baseline_adjustment.R . temperature_scenario_from_records.R . test_if_equal.R . weather2chillR.R . Full chillR package functions and examples
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