NOAA updates its data and products at different frequencies depending on the type of data and service. For example:
- The Global Historical Climatology Network daily (GHCNd) database receives daily updates and is reconstructed weekly with quality assurance checks. Real-time data streams are replaced by archive-ready data sources typically 45 to 60 days after the end of a month.
- Tropical weather products from the National Hurricane Center (NHC) are updated every six hours during hurricane seasons (e.g., at 5 AM, 11 AM, 5 PM, and 11 PM local times), with intermediate updates every 3 hours when warnings are in effect. Special advisories may also be issued as needed.
- Monthly climate gridded datasets, such as NOAA's Monthly U.S. Climate Gridded Dataset (NClimGrid), are updated monthly.
Thus, NOAA updates vary from multiple times daily for weather and climate data to monthly or longer for other datasets, depending on the data product and its use. If there is a specific NOAA data product or service of interest, that can be detailed more precisely.
