Thornthwaite Monthly Water Balance Model

Release Date:

Full model documentation, including both a description of the physical process modeling methodology and the graphical user interface can be accessed from the button below. A demonstration input data file (necessary to run the model) is available with the model download.

Read more about the model in USGS Open-File Report 2007-1088: A Monthly Water-Balance Model Driven by a Graphical User Interface (McCabe and Markstrom, 2007).



This software has been approved for release by the U.S. Geological Survey (USGS). Although the software has been subjected to rigorous review, the USGS reserves the right to update the software as needed pursuant to further analysis and review. No warranty, expressed or implied, is made by the USGS or the U.S. Government as to the functionality of the software and related material nor shall the fact of release constitute any such warranty. Furthermore, the software is released on condition that neither the USGS nor the U.S. Government shall be held liable for any damages resulting from its authorized or unauthorized use. Also refer to the USGS Water Resources Software User Rights Notice for complete use, copyright, and distribution information.

Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.