National Weather Service Co-op Program
Contains daily/monthly/annual temperature and precipitation data from cooperative NWS sites in Colorado.
CoCoRaHS
A national volunteer network of weather observers measure and map precipitation (rain, hail and snow) for the US. Daily, monthly data listed by location or graphed on map.
CoAgMet
Weather data for agricultural use. Measuring temperature, humidity, precipitation, solar radiation, wind and soil temperature; calculating evapotranspiration. Hourly and daily values for sites around Colorado.
