Chilling Accumulation Models:
Their Calculation, Explanation, & Comparison
Using Various Models
- Calculations or Current and Historic Chilling Accumulation at California CIMIS Sites
Cumulative Chilling Hours:
Chilling Hour & Unit Accumulations:
Chill Model Updates Email List
The Fruit & Nut Center is closely monitoring Chill Portion calculations for the following stations: Shafter, Parlier, Brentwood, Modesto, Arvin-Edison, San Benito, Famoso, Patterson, Lodi, Porterville, Delano and Madera. If you would like to be notified if specific issues arise which are related to these stations, subscribe to our Chill Model Updates email list.
Dynamic Model & Chill Portions Accumulation Guide
- A how-to guide (pdf) by Kitren Glozer, Project Scientist, Dept. of Plant Sciences, for calculating chill portions, using weather data from a data logger in your orchard, and the Dynamic Model (Excel file). Both available for download.
Chilling Accumulation Models: Their Explanation and Comparison
- Chill Hour, Chill Unit & Chill Portion: Model Comparisons
- Fruit & Nut Crop Chill Portion Requirements: Chill Requirements in Chill Portions, calculated using the Dynamic Model. Because the Dynamic Model is still unfamiliar to many, to provide a frame of reference, a list of chilling requirements for many temperate tree crops has been compiled from the literature. (compiled by Katherine Jarvis-Shean, Dept. of Plant Sciences, UC Davis)