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chillR  

Statistical Methods for Phenology Analysis in Temperate Fruit Trees
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]
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 28 Aug. 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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