Sources
Every figure on this site comes from one of these. Each page names the source next to the number.
- NOAA National Centers for Environmental Information, U.S. Climate Normals 1991–2020 (annual and seasonal, by station)
- NOAA National Weather Service, Precipitation Frequency Data Server (NOAA Atlas 14)
- NOAA, NOAA Atlas 14 GIS grids (10-year, 5-minute estimates by region)
- NOAA Hydrometeorological Design Studies Center (NOAA Atlas 14 and Atlas 15)
- U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates
- International Code Council, International Residential Code 2024, Chapter 8, Section R801.3 (via UpCodes)
- International Code Council, International Plumbing Code 2024, Chapter 11 (via UpCodes)
- SMACNA, Downspout and Gutter Sizing Calculator (Architectural Sheet Metal Manual)
- Copper Development Association, Copper in Architecture Design Handbook (A4050-8/24), section 10, Gutters and Downspouts
- Texas Water Development Board, Texas Manual on Rainwater Harvesting, 3rd edition
- U.S. EPA, Lead Renovation, Repair and Painting Rule, 40 CFR 745
- Federal Trade Commission, Cooling-Off Rule, 16 CFR 429
- University of Minnesota Extension, Dealing with and preventing ice dams
- InterNACHI, Standard Estimated Life Expectancy Chart for Homes
- Georgia Secretary of State, Traditional Specialty Contractors
- N.C. General Statutes § 87-1
- S.C. Code, Title 40 Chapter 59
- Tennessee Board for Licensing Contractors, Home Improvement
- Code of Virginia § 54.1-1100
- Maryland Business Regulation § 8-101
- 16 DCMR Chapter 8
- Home Improvement Consumer Protection Act, Act 132 of 2008
- 2025 California Wildland-Urban Interface Code, Chapter 5 (UpCodes)