The Global Historical Climatology Network-Daily (GHCN-Daily) database provides daily climate data from over 80,000 stations across 180 countries, covering variables such as temperature, precipitation, snowfall, and snow depth. It serves as the official archive for U.S. daily climate data and is regularly updated and reprocessed to ensure synchronization with its sources. The dataset includes quality assurance checks to identify and correct errors, though it does not homogenize data for changes in systematic bias. GHCN-Daily is used for climate analysis and monitoring, including studies on extreme weather events and climate trends. It is updated daily and weekly, with new versions available for public access. The dataset is also used to support climate research and monitoring, and its comprehensive nature makes it a key resource for climate studies. The database is continuously expanded through contributions from various sources, including government agencies and international networks. The dataset is maintained with a multi-tiered quality assurance approach, ensuring data reliability and consistency. The GHCN-Daily dataset is essential for understanding climate variability and change, and its continued development and integration of new data sources are crucial for future climate research.The Global Historical Climatology Network-Daily (GHCN-Daily) database provides daily climate data from over 80,000 stations across 180 countries, covering variables such as temperature, precipitation, snowfall, and snow depth. It serves as the official archive for U.S. daily climate data and is regularly updated and reprocessed to ensure synchronization with its sources. The dataset includes quality assurance checks to identify and correct errors, though it does not homogenize data for changes in systematic bias. GHCN-Daily is used for climate analysis and monitoring, including studies on extreme weather events and climate trends. It is updated daily and weekly, with new versions available for public access. The dataset is also used to support climate research and monitoring, and its comprehensive nature makes it a key resource for climate studies. The database is continuously expanded through contributions from various sources, including government agencies and international networks. The dataset is maintained with a multi-tiered quality assurance approach, ensuring data reliability and consistency. The GHCN-Daily dataset is essential for understanding climate variability and change, and its continued development and integration of new data sources are crucial for future climate research.