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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://agroclimate.org/tools/Chill-Hours-Calculator/
Oct 01, 2020 · Select chill hours model. < 45 ºF. 32-45 ºF.
http://fruitsandnuts.ucdavis.edu/Weather_Services/chilling_accumulation_models/Chill_Calculators/?type=chill
156 rows · Cumulative Chilling Hours: Cumulative Chill Hours and Modified Chill Hours Hours below …
http://www.theplantlady.com/calculate-chill-hours-area/
Oct 31, 2013 · Some sources only count time below 45 deg F, other sources only use 35-55 deg F. Extreme lows (below 30 or 32 deg F) are not counted, since these temps do not seem to work toward breaking dormancy. There are two different methods for calculating your areas accumulation of chill hours: Chill Accumulation.
https://www.evergreennursery.com/fruit-tree-chill-hours
There are different formulas for calculating chill hours but simply put, chill hours are defined as the hours that a fruit tree needs to be exposed to temperatures between 32-45 degrees F.
http://www.growingitlocal.com/index.php/your-zip/
The local chill hour calculator below will help you determine the chill hours at your location. To determine the chill hours for your location, first find your location on the Weather Underground "Wundermap" linked below. Click the bubble of the closest station and write down the Station ID shown at the top (for example, KCALAKES1).
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