Fruit & Nut Research and Information Center

Weather Services

Pomology Weather Services

Cumulative Chilling Hours
Hours below 45° F
Hours between 32 F and 45° F
November 1 through February 28/29

Cumulative Chilling Portions
Portions (Dynamic Model)
September 1 through August 31

Cumulative Chilling - Research
Hours below 45° F
Hours between 32° F and 45° F
Units (Utah Model)
September 1 through August 31

Harvest Prediction Model
for Peaches, Plums, and Nectarines
February 1 through May 31