WSU Tree Fruit Research & Extension Center

TFREC Computer & Web Resources

Note: This information is under development and should not be used for orchard management.

Calculator for Modeling Apple Fruit Skin Temperature

Please note, this model is for illustration purposes only to show the relative effects of different factors on the fruit skin temperature of apples. It should not be used to make actual orchard management decisions.

It is based upon the energy balance model developed by WSU researchers.

The program code assumes a time of 2 PM.

Default conditions

Skin temperature at 2PM is 119

Air temperature Relative humidity %


Sun and clouds


Fruit size diameter (in.)

A sunburn protectant has been applied has not been applied