The Crop Weather Program for South Texas (http://cwp.tamu.edu) has been developed to help farmers and consultants to monitor weather conditions, crop growth and development, crop water use, and soil water storage that allow them to make management decisions conducive to profitable crop production. CWP is the gateway for: (1) accessing up-to-the-hour weather data measured hourly by a network of 21 automated weather stations spread throughout 10 South Texas counties. Hourly or daily databases can be searched on-line quickly with just a few button clicks. (2) Requesting field-specific crop-environment calculations to estimate time- and weather-sensitive variables such as crop growth and development, potential evapotranspiration (PET), crop water use, and soil water balance. To access this area of CWP, users need to register and create their own password-protected web site where they can store unlimited number of field profiles used to run the various calculations.