Blackberry Chill Model

To retrieve chill units from the blackberry chill model(s), choose a state, station, and season of interest.


Select a state:

Select a station:

Select a growing season:


      





This project is being done in collaboration with Dr. Gina Fernandez in the NCSU Department of Horticulture, and the North Carolina Agricultural Research Service (NCARS).

Note that instantaneous temperatures are used for calculating the inception date for all models. For chill unit calculations, hourly average temperatures are used where available.

* Model 1 accumulates 1 chill unit when temperature < 7° C . Chilling inception occurs at the first incidence of -2.2° C.
* Model 2 accumulates 1 chill unit when temperature is between 0 and 7° C (32°F and 45°F). Chilling inception occurs at the first incidence of -2.2° C (28°F).
* Model 5 accumulates 1 chill unit when temperature is between 0 and 9.1° C, 0.5 units between 9.2 and 12.4° C, 0 units between 12.5 and 15.9° C, -0.5 units between 16 and 18° C, and -1 units > 18° C. Chilling inception occurs at the first incidence of -2.2° C.
* Model 6 accumulates 0.5 chill units when temperature is between 1.5 and 2.4° C, 1 unit between 2.5 and 9.1° C, 0.5 units between 9.2 and 12.4° C, 0 units between 12.5 and 15.9° C, -0.5 units between 16 and 18° C, and -1 units > 18° C. Chilling inception occurs at the first incidence of -2.2° C.
Warmund, Michele R., and J. Krumme, "A Chilling Model to Estimate Rest Completion of Erect Blackberries," HortScience 40(5):1259-1262. 2005.

** Forecast is made from numerical weather model WRF, initialized at 2018012106Z