Climatic Data for Frost Protected Shallow Foundations
The methodology used to create the 100-year return period of the Air-Freezing Index (AFI) is available in the technical publication Air-Freezing Index Statistics for the United States. Pages 8-11 provide an overview and sections on AFI data applications and a description of the AFI return period estimates. Pages 7-8 contain references that supported this work.
Other data set documentation for related products:
NCDC Dataset 9712A - Last Spring And First Fall Freeze Dates
NCDC Dataset 9712B - Last Spring And First Fall Freeze Dates
NCDC Dataset 9712C - Probability Levels For Freeze Dates And Growing Season Lengths
This page was developed as a parternership among the National Climatic Data Center, National Association of Home Builders Research Center, and American Society of Civil Engineers.