We have developed a web-based version of Climpact that allows users to calculate indices without installing software. Alternatively, you can install Climpact locally by referring to the Climpact Github page for instructions. Calculation of the Climpact indices from gridded data can only be done on a local computer. See the Climpact user-guide for more details about the Climpact software.
Please acknowledge Climpact in any work you produce, with a statement similar to the following: The Climpact software (see www.climpact-sci.org) was used to calculate climate indices used in this study.