File AET2RET_Ratios.csv lists the AET to RET (actual to reference evapotranspiration) ratios, or AET/RET, used to calculate actual evapotranspiration for each land cover type. The daily measured AET data collected at the ET stations were used to calculate the monthly totals for each month of the year. These monthly AET totals were then used to calculate the average AET/RET monthly ratios for the land cover of the ET station by dividing the AET rates by the RET rates obtained from the Florida ET network (http://fl.water.usgs.gov/et/; USGS, 2016). The land cover types represented in these data are forest, grass, marsh, open water, ridge, urban, and agriculture. The AET/RET ratios for these land cover types were presented in O’Reilly, 2007; Sumner and others, 2017; Sumner, 2017; and U.S. Geological Survey, 2017. These ratios are used as an extrapolation of AET rates for all months in the entire 2000-2016 period of record, not just the months when the ET stations were in operation. Land-cover based types were obtained from a generalized land use map provided by the Florida Geological Survey ( https://floridadep.gov/fgs ). Average monthly AET/RET rates for the period of record were calculated from measured AET data from the ET stations listed in file AET_Monthly_Totals.csv. These references were used in the generation of the AET/RET ratios for the land cover types in east-central Florida: O’Reilly, A.M., 2007, Effects of the temporal variability of evapotranspiration on hydrologic simulation in central Florida: U.S. Geological Survey Scientific Investigations Report 2007–5100, 36 p. Sumner, D.M., Hinkle, C.R. and Becker, K.E., 2017, Evapotranspiration (ET) at University of Central Florida urban site, daily data, Orange County, Florida, January 29, 2009–September 27, 2012: U.S. Geological Survey data release, accessed September 20, 2017, at https://doi.org/10.5066/F7JS9NZB. Sumner, D.M., 2017, Evapotranspiration (ET) at Tiger Bay State Forest site, Volusia County, Florida, January 1, 1998–December 31, 1999: U.S. Geological Survey data release, accessed September 20, 2017, at https://doi.org/10.5066/F7SB447H. U.S. Geological Survey, 2016, Evapotranspiration information and data: Caribbean-Florida Water Science Center website, accessed June 29, 2016, at http://fl.water.usgs.gov/et/. U.S. Geological Survey, 2017, National Water Information System—Web interface: Accessed September 20, 2017, at http://dx.doi.org/10.5066/F7P55KJN.