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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#:~:text=The%20traditional%20definition%20of%20a%20chill%20hour%20is,if%20the%20temperature%20is%20between%2045%C2%B0F%20and%2034%C2%B0F.
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.
https://www.cultivatetoplate.com/what-are-chilling-hours-and-why-are-they-important/
Chill hours are the total number of hours below 45 degrees F that a plant is exposed to during their dormant period to produce properly developed fruit. Some deciduous fruit trees (fruit trees that loose their leaves seasonally) must go through a certain minimum number of chill hours to release their dormancy, go into bloom, and set their fruit.
https://etweather.tamu.edu/chill/
Chilling hours are calculated as a tool for fruit producers to gauge whether their crop has been exposed to cold temperatures for a long enough time period. This table shows chilling hours as recorded at the Overton Center and should provide you with an estimate of chilling hours if you live in northeast Texas.
https://waldenheightsnursery.com/chilling-hours/
Chilling hours relate to the time a region is between a set of temperatures. Most authorities put this range as 32-45 degrees F, though this is a simplified definition. Central Pennsylvania for instance may have 1400 chilling hours in a given year. Much of Florida however, may get none.
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://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. Notice, it is not the amount of time the temperature is below freezing.
https://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=16468
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.
https://www.gardeningknowhow.com/edible/fruits/strawberry/strawberry-chilling-requirements.htm
The traditional definition of a chill hour is any hour under 45 degrees F. (7 C.). That said, academics quibble over the actual temperature. In the case of chilling requirements for strawberries, the period is defined as the number of accumulated hours between 28 and 45 degrees F. (-2 to 7 C.).
https://blogs.extension.msstate.edu/fruit/2012/02/20/blueberry-chilling-hours-information-from-nc/
Generally chill hours refers to hours below 45 degrees Fahrenheit, however for blueberry chill hour calculations in North Carolina we use a model developed by Dr. Mike Mainland to account for both (i) partial chilling at moderate temperatures and (ii) the negation of chill that occurs with warm temperatures in winter.
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