National Oceanic and Atmospheric Administration (NOAA) National Centers for Environmental Information (NCEI)
The U.S. Climate Reference Network (USCRN) is a systematic and sustained network of climate monitoring stations with sites across the conterminous U.S., Alaska, and Hawaii. These stations use high-quality instruments to measure temperature, precipitation, wind speed, soil conditions, and more. Information is available on what is measured and the USCRN station instruments.
Temperature and Precipitation observations are available from monthly, daily, hourly, and sub-hourly datasets; soil moisture observations are available hourly.