Annual timeseries of daily cross-validation mean absolute error (MAE), averaged over all station days for each year, comparing results for Daymet V4 and Daymet V3. (a) MAE for estimation of daily maximum temperature. (b) MAE for estimation of daily total precipitation. Image from Thornton et al. 2021.
A recent publication by Thornton et. al., 2021, Gridded daily weather data for North America with comprehensive uncertainty quantification, details improvements to the Daymet V4 Model.