R Observatory: Metrics for chillR version 0.77

Balamuta, James Joseph

doi:10.5281/zenodo.21843040

chillR

0.77

Statistical Methods for Phenology Analysis in Temperate Fruit Trees

2packages depend

27.1Kdownloads / year

3.2%test coverage

13/13checks pass

Overview

About

Maintained by Eike LuedelingFirst published 2013-05-1630 releasesCRAN 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.

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).

Health

CRAN checks

13OK

Slowest check: 7.9 min · r-oldrel-windows-x86_64

Code health

Yes

Tests · ratio 0.00

3.2%

Coverage · measured lines

100%

Documentation · exports

32

Dependencies · direct

Check history

OK2026-08-05
13 OK · 0 NOTE · 0 WARNING · 0 ERROR · 0 FAILURE
NOTE2026-08-01
12 OK · 1 NOTE · 0 WARNING · 0 ERROR · 0 FAILURE
OK2026-06-09
13 OK · 0 NOTE · 0 WARNING · 0 ERROR · 0 FAILURE
ERROR2026-06-08
12 OK · 0 NOTE · 0 WARNING · 1 ERROR · 0 FAILURE
OK2026-05-20
13 OK · 0 NOTE · 0 WARNING · 0 ERROR · 0 FAILURE

Show 4 earlier snapshots

ERROR2026-05-19
12 OK · 0 NOTE · 0 WARNING · 1 ERROR · 0 FAILURE
OK2026-04-22
14 OK · 0 NOTE · 0 WARNING · 0 ERROR · 0 FAILURE
ERROR2026-04-18
13 OK · 0 NOTE · 0 WARNING · 1 ERROR · 0 FAILURE
OK2026-03-10
14 OK · 0 NOTE · 0 WARNING · 0 ERROR · 0 FAILURE

Documentation

READMEYes · 70 wordsVignettesYes · dynamicpkgdown siteNoNEWSNoCode of conductNoContributing guideNo

Examples that run: 95%
Documented parameters: 96%
Return-value docs: 98%
References docs: 46%

Downloads

27.1K

CRAN downloads in the past year

Rank #4,047 · ~74/day · ~2.3K/mo

Releases R versions

Daily download trend is not available in this view yet.

53630 days

2.1K90 days

27.1K1 year

Compare downloads with other packages →

Also on499 r2u16 autocran

Dependencies

Declared dependencies

33 external dependencies (excludes base and recommended)

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

2direct

0indirect

decisionSupport ChillModels

Code & Tests

Datasets

People & History

People (3)

Maintainer (1)

Eike Luedeling

Author, Maintainer

Authors (3)

Eike Luedeling

Author, Maintainer

Lars Caspersen

Author · added in 0.73.1

Eduardo Fernandez

Author · added in 0.72.6

Package Timeline

30 releases. Pick two to compare their code metrics. R releases are shown for context.

R
R 4.6.0 released · 2026-04-24
0.77Latest
2025-12-11 · current release · diff ↗
R
R 4.5.0 released · 2025-04-11
0.76
2024-11-14 · diff ↗
R
R 4.4.0 released · 2024-04-24
0.75
2023-11-27 · diff ↗
0.74.1
2023-11-19 · diff ↗
0.74
2023-11-03 · diff ↗
0.73.1
2023-08-12 · diff ↗
R
R 4.3.0 released · 2023-04-21
0.72.8
2022-08-18 · diff ↗
R
R 4.2.0 released · 2022-04-22
0.72.7
2022-01-11 · diff ↗
0.72.6
2021-12-05 · diff ↗
0.72.5
2021-10-14 · diff ↗
R
R 4.1.0 released · 2021-05-18

Show 28 earlier events

0.72.4
2021-05-13 · diff ↗
0.72.2
2021-01-06 · diff ↗
0.72
2020-12-10 · diff ↗
0.70.24
2020-05-03 · diff ↗
R
R 4.0.0 released · 2020-04-24
0.70.21
2019-11-05 · diff ↗
0.70.17
2019-05-26 · diff ↗
R
R 3.6.0 released · 2019-04-26
0.70.15
2019-03-05 · diff ↗
0.70.14
2019-02-16 · diff ↗
0.70.12
2018-12-18 · diff ↗
0.70.6
2018-06-29 · diff ↗
R
R 3.5.0 released · 2018-04-23
0.70.2
2018-01-06 · diff ↗
0.70.1
2018-01-06 · diff ↗
0.70.0
2018-01-04 · diff ↗
R
R 3.4.0 released · 2017-04-21
0.66
2017-03-24 · diff ↗
0.65
2017-01-23 · diff ↗
R
R 3.3.0 released · 2016-05-03
0.62
2016-03-12 · diff ↗
0.60
2016-03-08 · diff ↗
R
R 3.2.0 released · 2015-04-16
0.55
2015-04-15 · diff ↗
R
R 3.1.0 released · 2014-04-10
0.54
2013-05-16 · diff ↗
3.0.1
2013-05-02
R
R 3.0.0 released · 2013-04-03

Package metadata

First published: 2013-05-16
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
Installed size: not tracked yet
With dependencies: not tracked yet

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 is what citation() produces when a package has no citation file of its own. If it prints something else, use that.

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 v2026-08-18. https://doi.org/10.5281/zenodo.21843040

From data release v2026-08-18, which the citation names so these numbers can be found later. More on citing and the projects behind them.

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