R Observatory: Metrics for chillR version 0.77

Balamuta, James Joseph

doi:10.5281/zenodo.21843040

chillR

0.77Package record

Statistical Methods for Phenology Analysis in Temperate Fruit Trees

1packages dependsuggested by 1

13.3Kdownloads / year

3.2%test coverage

13/13flavors OK

Overview

About

Maintained by Eike LuedelingCRAN page ↗

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.

Install

R (CRAN)Ubuntu (r2u)Fedora (COPR)openSUSE (OBS)

install.packages("chillR", repos = "https://cloud.r-project.org/")

Installs the current CRAN release. Prebuilt binaries on Windows and macOS.

Release

# enable cranapt (r2u) if it is not already set up, then install
grep -rqs r2u.stat.illinois.edu /etc/apt/sources.list /etc/apt/sources.list.d/ \
  || curl -fsSL https://raw.githubusercontent.com/eddelbuettel/r2u/master/inst/scripts/add_cranapt_noble.sh | sudo bash
sudo apt install -y r-cran-chillr

Fast Ubuntu binaries via r2u (no compilation). The cranapt setup runs once and is skipped when it is already enabled. We list this channel from recorded r2u download activity rather than from a live index of the repository, so treat it as last known rather than guaranteed.

bspm (used by r2u) also needs make: sudo apt install make

# enable the iucar/cran COPR if it is not already present, then install
ls /etc/yum.repos.d/*iucar*cran*.repo >/dev/null 2>&1 \
  || sudo dnf copr enable -y iucar/cran
sudo dnf install -y R-CRAN-chillR

RPMs from the iucar/cran COPR, rebuilt from CRAN.

For install.packages() integration in R, also: sudo dnf install R-CoprManager

# add the autoCRAN OBS repo (Tumbleweed) if it is missing, then install
zypper -q lr | grep -qi autoCRAN \
  || sudo zypper addrepo https://download.opensuse.org/repositories/devel:/languages:/R:/autoCRAN/openSUSE_Tumbleweed/devel:languages:R:autoCRAN.repo
sudo zypper install -y R-chillR

RPMs auto-built from CRAN on openSUSE OBS (Tumbleweed). We list this channel from recorded autoCRAN download activity rather than from a live index of the repository, so treat it as last known rather than guaranteed.

Health

CRAN checks

13OK

CRAN check page ↗

Slowest check: 8.2 min · r-oldrel-windows-x86_64

Status changes

OK13 OK2026-08-05
NOTE12 OK, 1 NOTE2026-08-01
OK13 OK2026-06-09
ERROR12 OK, 1 ERROR2026-06-08
OK13 OK2026-05-20

Show 4 earlier changesHide 4 earlier changes

ERROR12 OK, 1 ERROR2026-05-19
OK14 OK2026-04-22
ERROR13 OK, 1 ERROR2026-04-18
OK14 OK2026-03-10

Advisories

none known

How this is measured·How advisories are found

Documentation

In release 0.77

READMEYes · 70 wordsVignettesYes · 2 · dynamicNEWSNoCitation fileNoWebsitenot declared in DESCRIPTION

Help pages: 123 (1 internal)includes a package overview page
Examples that run: 82%81 run in a plain check · 5 never run · 13 hold no code
Exported functions with examples: 89%
Documented parameters: 96%
Return-value docs: 98%
Help pages citing references: 46%

Vignettes (2)

How these are measured

Downloads

13.3K

CRAN downloads in the past year

Rank #3,691 · ~37/day · ~1.1K/mo

Releases R versions

Daily download trend is not available in this view yet.

1.2K30 days

2.6K90 days

13.3K1 year

Compare downloads with other packages →

Also on459 r2u21 autocran

How downloads are counted

Dependencies

Declared dependencies

33 external dependencies (excludes base and recommended)

Installing chillR adds 99 packages (61 with compiled code, 93 MB of source tarballs). Heaviest: stringi 11 MB, sf 9.3 MB, ggplot2 6.0 MB.

Depends (1)

R >= 3.5.0

Imports (32)

assertthat dplyr ecmwfr fields GenSA ggplot2graphicsgrDeviceshttr jsonlite lubridate magrittr metR patchwork pls plyr progress purrr R.utils raster Rcpp RCurl readxl reshape2 rlang RMAWGEN scalesstatsstringr tidyrutilsXML

LinkingTo (1)

Rcpp

Suggests (4)

knitr ncdf4 rmarkdown testthat

Enhances (0)

none

Dependency license breakdown →

Reverse dependencies

1direct

0indirect

Imports 1

Suggested by 1

Depends, Imports or LinkingTo, most downloaded first

decisionSupport

Suggests, most downloaded first

ChillModels

How these are counted

Code & Tests

Datasets

People & History

People (3)

Eike Luedeling

Author, Maintainer since 0.54 (2013)

Lars Caspersen

Author · added in 0.73.1

Eduardo Fernandez

Author · added in 0.72.6

Releases (30)

Pick two releases to compare their code metrics.

R
R 4.6.0 released · 2026-04-24
R
R 4.5.0 released · 2025-04-11
R
R 4.4.0 released · 2024-04-24
R
R 4.3.0 released · 2023-04-21
R
R 4.2.0 released · 2022-04-22
R
R 4.1.0 released · 2021-05-18
R
R 4.0.0 released · 2020-04-24
R
R 3.6.0 released · 2019-04-26
R
R 3.5.0 released · 2018-04-23
R
R 3.4.0 released · 2017-04-21
R
R 3.3.0 released · 2016-05-03
R
R 3.2.0 released · 2015-04-16
R
R 3.1.0 released · 2014-04-10
3.0.1Latest
record
2013-05-02 · current release · diff ↗ ·
added 1 export
pattern:^[[:alpha:]]+
0.77
record
2025-12-11 · diff ↗
0.76
record
2024-11-14 · diff ↗

Show 28 earlier eventsHide 28 earlier events

0.75
record
2023-11-27 · diff ↗ ·
added 2 exports
convert_scen_information, download_baseline_cmip6_ecmwfr
0.74.1
record
2023-11-19 · diff ↗
0.74
record
2023-11-03 · diff ↗ ·
added 3 exports
download_cmip6_ecmwfr, extract_cmip6_data, gen_rel_change_scenario
0.73.1
record
2023-08-12 · diff ↗ ·
added 2 exports
handle_dwd_old, handle_gsod_old
0.72.8
record
2022-08-18 · diff ↗
0.72.7
record
2022-01-11 · diff ↗
0.72.6
record
2021-12-05 · diff ↗ ·
added 3 exports
handle_dwd, plot_phenology_trends, plot_scenarios
0.72.5
record
2021-10-14 · diff ↗
0.72.4
record
2021-05-13 · diff ↗ ·
removed 2 exports
handle_chile_agromet, handle_wunderground

added 1 export
patch_daily_temps
0.72.2
record
2021-01-06 · diff ↗
0.72
record
2020-12-10 · diff ↗ ·
added 16 exports
DynModel_driver, PhenoFlex, PhenoFlex_GAUSSwrapper, PhenoFlex_GDHwrapper, PhenoFlex_fixedDynModelGAUSSwrapper, PhenoFlex_fixedDynModelwrapper, StepChill_Wrapper, UniChill_Wrapper, UniForce_Wrapper, UnifiedModel_Wrapper, add_date, bootstrap.phenologyFit, genSeason, genSeasonList, phenologyFit, phenologyFitter
0.70.24
record
2020-05-03 · diff ↗
0.70.21
record
2019-11-05 · diff ↗
0.70.17
record
2019-05-26 · diff ↗ ·
added 2 exports
Empirical_daily_temperature_curve, Empirical_hourly_temperatures
0.70.15
record
2019-03-05 · diff ↗
0.70.14
record
2019-02-16 · diff ↗ ·
added 2 exports
getClimateWizard_scenarios, make_daily_chill_plot2
0.70.12
record
2018-12-18 · diff ↗ ·
added 2 exports
load_ClimateWizard_scenarios, runn_mean_pred
0.70.6
record
2018-06-29 · diff ↗ ·
added 9 exports
JDay_count, JDay_earlier, JDay_later, bloom_prediction3, getClimateWizardData, load_temperature_scenarios, make_climate_scenario, save_temperature_scenarios, tempResponse_daily_list
0.70.2
record
2018-01-06 · diff ↗
0.70.1
record
2018-01-06 · diff ↗
0.70.0
record
2018-01-04 · diff ↗ ·
added 13 exports
Date2YEARMODA, GDH_model, RMSEP, RPD, RPIQ, bloom_prediction2, check_temperature_record, daylength, filter_temperatures, interpolate_gaps_hourly, patch_daily_temperatures, stage_transitions, tempResponse_hourtable
0.66
record
2017-03-24 · diff ↗
0.65
record
2017-01-23 · diff ↗ ·
added 15 exports
GDD, check_temperature_scenario, extract_differences_between_characters, extract_temperatures_from_grids, identify_common_string, make_JDay, make_climate_scenario_from_files, ordered_climate_list, plot_climate_scenarios, read_tab, select_by_file_extension, temperature_generation, temperature_scenario_baseline_adjustment, temperature_scenario_from_records, test_if_equal
0.62
record
2016-03-12 · diff ↗ ·
removed 1 export
pattern:^[^\\.]

added 38 exports
Chilling_Hours, Dynamic_Model, GDH, PLS_chill_force, PLS_pheno, Utah_Model, VIP, YEARMODA2Date, bloom_prediction, chile_agromet2chillR, chilling, chilling_hourtable, color_bar_maker, daily_chill, fix_weather, get_last_date, get_weather, handle_chile_agromet, handle_cimis, handle_gsod, handle_ucipm, handle_wunderground, interpolate_gaps, leap_year, make_all_day_table, make_california_UCIPM_station_list, make_chill_plot, make_daily_chill_figures, make_daily_chill_plot, make_hourly_temps and 8 more
0.60
record
2016-03-08 · diff ↗ ·
removed 1 export
pattern:^[[:alpha:]]+

added 1 export
pattern:^[^\\.]
0.55
record
2015-04-15 · diff ↗
0.54
record
2013-05-16
R
R 3.0.0 released · 2013-04-03

Package metadata

First published: 2013-05-02
Total releases: 30 / 13 yrs
License: GPL-3 OSI
Minimum R: ≥ 3.5.0
Bundled data: 51 KB / 4 files
Download size: 1.1 MB

Cite

Cite this package

Run in R for the authors' preferred citation:

citation("chillR")

Format

Luedeling, E., Caspersen, L., & Fernandez, E. (2025). chillR: Statistical Methods for Phenology Analysis in Temperate Fruit Trees (Version 0.77) [Computer software]. https://doi.org/10.32614/CRAN.package.chillR

This package has no citation file, so citation() returns this entry built from DESCRIPTION.

Cite the R Observatory

For a number measured here: a download total, a coverage figure, an archival date.

Format

APA

Balamuta, J. J. (2026). R Observatory: Metrics for chillR version 0.77 [Data set]. HJJB, LLC. Data release v2026-10-19. https://doi.org/10.5281/zenodo.21843040

From data release v2026-10-19, which the citation names so these numbers can be found later. More on citing and the projects behind them.

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