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full-methodology
The AGS environmental databases consist of several separate database components, which include:
• Temperature
• Precipitation
• Degree Days
• Air Quality
• WeatherRisk
• Hurricane Risk
• Tornado Risk
• Damaging Wind Risk
• Hail Risk

Climate Content
The AGS climate database consists of the following variable groups:

Temperature: Average, maximum, and minimum daily for January, July, and annual
Precipitation: Annual rainfall and snowfall
Degree Days: Annual average heating and cooling degree days
Air Quality: Air quality indexes

Methodology and Data Sources
The climate database was created from two separate sources. The temperature, precipitation, and degree days variables were derived from an analysis of weather observations from federal government sources.

The air quality indexes were derived from data obtained from the EPA and modeled using similar methods.

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WeatherRisk and QuakeRisk Content

The WeatherRisk database consists of four separate types of weather-related hazards: hurricanes, tornadoes, hail, and damaging winds. The data are the results of a series of spatial analysis carried out on records compiled from publicly available USGS sources aimed at producing risk index estimates at the block group level and above.

Methodology and Data Sources
Hurricane track data was obtained from publicly available USGS records. Atlantic hurricane coverage is from 1896 to 1996, covering a total of 951 storms. Pacific hurricane coverage is from 1949 to 1996, covering a total of 661 storms. Storm locations are tracked every six hours while the storm maintains the minimum wind speed required to be classified as a tropical storm. Along with location, the database includes information