Estimate the long-term average weather conditions at any location in Puerto Rico

Estimate the long-term average weather conditions at any location in Puerto Rico using the PRET computer program. Although the program is intended to estimate the monthly and daily evapotranspiration, you can also obtain monthly values of minimum and maximum air temperature, dew point temperature, wind velocity and solar radiation. Here are the steps:

1. Download PRET from the following link: Background documentation is available at this site which describes the methods used to estimate the long-term weather data.
2. Install PRET on your computer.
3. Run PRET. You will see the splash screen below. Click on OK.

4. On the INPUT DATA screen, enter any crop from the drop down screen (e.g., tomato). Do not use “generic”, otherwise you will need to enter some crop coefficient information later. Enter the name of your location (e.g., Juana Diaz), enter your site latitude (e.g., 18.06) and your site elevation (e.g., 55 m). Ignore all other requested input on the page. click Next.

5. Click the icon that says “Have Program Calculate Climate Data (Applicable only for Puerto Rico)”.

6. Click on the appropriate NOAA Climate Division. For example, Juana Diaz, PR, is in Climate Division 2.

7. The next page will give you the results of the long-term monthly weather parameters for your site. If you like you can save the data to a text file.

If you have any questions, contact me at


DISCLAIMER: The information is provided “as is”. The authors and publishers of this information disclaim any loss or liability, either directly or indirectly as a consequence of applying the information provided herein, or in regard to the use and application of said information. No guarantee is given, either expressed or implied, in regard to the accuracy, or acceptability of the information.


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