Peak Timing of Runoff (1985 to 2020) Summarized within Global Watershed Basins

Data associated with manuscript: Historical Trends in Snowmelt Used for Irrigation by Kinnebrew et al., 2025, <i>Environmental Research: Food Systems </i>(https://doi.org/10.1088/2976-601X/adacec).These data represent the temporal mass center of runoff, or peak runoff timing, for each year (1985 to 2020) and within each watershed basin (HydroBASINS level 3; https://www.hydrosheds.org/products/hydrobasins). The data were summarized from snowmelt, rainfall and total runoff data from TerraClimate (https://doi.org/10.5061/dryad.vx0k6dk2h). Please see the manuscript methods for additional information.<b>Column Names and Descriptions:</b>1. <b>watershedNum:</b> the HUC12 identifier number from HydroBASINS level 32. <b>year:</b> data year, from 1985 to 20203. <b>CT_Snow: </b>the month in which the mass center of snowmelt runoff occurred. Values correspond to month and day (see note below)4. <b>CT_Rain: </b>the month in which the mass center of rainfall runoff occurred. Values correspond to month and day (see note below)5. <b>CT_Total: </b>the month in which the mass center of total (snowmelt and rainfall) runoff occurred. Values correspond to month and day (see note below)<br><b>Converting values to month and day: </b>The whole number corresponds to the month (1: January, 2: February, 3: March, etc.). The fraction can be converted to the day of the month by multiplying it by the number of days in the month. A value of 1.3 would correspond to January 9, or a value of 9.7 would correspond to September 21.