This data release includes downscaled climate inputs and hydrologic outputs from 41 Basin Characterization Models (BCM) version 8 (v8), described in Flint and others (2021), with a 10 by 10-meter spatial resolution at monthly intervals from water years 1896 to 2023. Forty-one (41) models were developed for sentinel monitoring locations in Wildlife Areas and Ecological Reserves in California, USA. BCM bioclimatic variables (1991-2020), BCM Model Archives, monthly climate variables [precipitation (PPT), maximum air temperature (TMX), minimum air temperature (TMN), potential evapotranspiration (PET)], monthly hydrology BCM variables [actual evapotranspiration (AET), climatic water deficit (CWD), snowpack or snow water equivalent (PCK), recharge (RCH), runoff (RUN), and soil moisture storage (STR)], and water year and 30-year climate and hydrology summaries are provided for each model.