Climate Normals are three-decade averages of climatological variables including temperature and precipitation. This product is produced once every 10 years. The 1981–2010 U.S. Climate Normals dataset is the latest release of NCEI's Climate Normals.
This Atlas provides precipitation frequency estimates for 5-minute through 60-day durations at average recurrence intervals of 1-year through 1,000-year.
This is an index that compares precipitation over a selected duration to the historical probability of precipitation. Click here to visit the tool for Delaware SPI data.