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https://www.groworganic.com/blogs/articles/chill-hours-what-are-they-how-do-i-count-them-and-why-do-my-fruit-trees-car
The traditional definition of a chill hour is any hour under 45°F. But wait, there's more. But wait, there's more. Academics have competing theories on what "chill" means.
http://extension.msstate.edu/content/tree-fruit-what-are-chill-hours
Chilling hours are defined as period of time between 32º F and 45º F. Plants are assigned a certain chilling requirement based on the amount of cold needed to cause 50 percent of the buds to break and flower in the spring. Most blueberries have a chilling requirement of 400-600 hours.
http://gardeningsolutions.ifas.ufl.edu/plants/edibles/fruits/chill-hours.html
Oct 23, 2013 · Chill Hours. In order to bloom in spring, deciduous fruit trees like peaches, plums, and nectarines all must go through the plant equivalent of a long winter's nap. They need a dormancy period with a certain number of chilling hours, when the …
https://www.lecooke.com/ask-the-grower/what-are-chill-hours.html
In its simplest definition, chilling hours are the number of more or less continuous hours under 45 degrees F. during the dormant period. Of course nothing is that simple since some days the temperature raises high enough to offset chilling that has previously occurred.
https://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=16468
Jan 14, 2015 · The necessary signal strength varies between species, but is officially referred to as “chill hours”, or vernalization, when the temperature stays between 32°-45°F. The hormone responsible for dormancy breaks down in this range, allowing buds to develop into flowers or foliage when the weather warms up in late winter.
http://fruitsandnuts.ucdavis.edu/Weather_Services/chilling_accumulation_models/about_chilling_units/
There are three common models used to calculate chilling, each one defining what a chilling unit is: 1) Hours below 45°F model; 2) Hours between 32°F and 45°F model; and 3) Utah model. The Byrne and Bacon explanation of calculations used by the Utah model:
https://www.wilsonbrosgardens.com/what-are-chill-hours-for-fruit-plants-trees.html
Jan 15, 2017 · A chill hour is equal to one hour that a fruit plant or tree spends in cooler temperatures ranging from 45 to 32 degrees Fahrenheit. Various types of fruit plants and trees require different amounts of chill hours. Some fruit trees, such as figs, only require 100 chill hours during the cool season. Others can require up to 1,000 chill hours.
https://www.plantmegreen.com/pages/plant-hardiness-zones-and-chill-hours
Chill Hours (sometimes called Chill Units) are an approximation of how many hours of weather between 32 degrees and 45 degrees (F) a plant requires to properly go dormant so it can wake up and blossom and/or set fruit. Some plants, like fruit trees and certain flowers, require a minimum number of chill hours to thrive.
http://www.theplantlady.com/calculate-chill-hours-area/
Oct 31, 2013 · There are two different methods for calculating your areas accumulation of chill hours: Chill Accumulation the number of hours between 30 & 45 deg F accumulated over the dormant season (traditionally starting November 1) however, when there are warm days in this period of dormancy, it cancels out the hours accumulated during the night.
https://www.merriam-webster.com/dictionary/chill
Definition of chill. (Entry 1 of 3) 1 a : a sensation of cold accompanied by shivering (as due to illness) He had caught a chill that night, and was now down with a fever. — Wilkie Collins — usually plural If you have a cough, fever and chills and are not breathing as easily as usual, you might have a cold or the flu.
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