New Mexico State University
Climate Center's

Chill Unit Calculator Java Version

This system calculates the Chill Units for a given set of data. This page is a compilation of several databases, some global some local to NM, and is fairly involved... not complicated. So if you are new to this system please read the instructions fully. We have made every effort to assure that this page is user-friendly, however if you do have a problem or a simple question you can contact me at

Step 1: Getting daily weather data: Data can be acquired from the following places or you can enter the data by hand into the Wizard. The data needed is Date, maximum and minimum temperature

Step 2: Filling out the Chill Unit Wizard

Column 1 starts on this side. For dates with the format "DD/DD/DD" it is considered one column, all others separated
by white space, commas, or other are individual.
1.What is the Format
of the Date?
Other Date *
Specify columns
Month Day Year

*Year is not needed.
Note: use for dates
that are separated by

2.Column Number?
(Starting with one)
Date *
Max Temp
Min Temp

* If date is not one column
please choose "other" as
the format of the date and
fill in the columns that each
month and day appear

3. The Data Above are in?
4. How is Data Separated?
White space (including tabs)
6. Which model to use?

Minimum Value Only
Range 1 Only
Utah Model (Full Range)
Linearly Interpolated

6. What are the temperature
Minimum Cut-off: 0.0
Range 1 Max: 0.5
Range 2 Max: 1.0
Range 3 Max: 0.5
Range 4 Max: 0.0
Maximum Cut-off: -0.5
> Max. Cut-off -1.0

*The minimum temperature for a
range is determined from the
previous range's maximum.

Works best with Internet Explorer.

Program Info:

|  DATE  | Chl-Unts | Cum C-U | C GDH | Cum GDH | F GDH | Cum GDH | Tmx | Tmn |

If you have any questions please contact
Copyright 1996 New Mexico State University
Last Updated: Nov 18 1999
Department of Agronomy and Horticulture
Box 30001 / Dept.3Q / Las Cruces, N M 88003-8003
Telephone: (505)646-3405
FAX: (505)646-6041