Q. How can I find certified climate data that can be used as evidence in a court of law?

The United States government collects and maintains climate data from observing stations throughout the country. For certified weather data for use in litigation, the National Centers for Environmental Information (formerly known as the National Climatic Data Center), a division of NOAA (National Oceanic and Atmospheric Administration) provides authenticated data through a U.S. Department of Commerce Certification. Certified data is provided on a fee based schedule dependent on the number of pages ordered, plus a shipping charge. 

The following are some of the types of data may be ordered:

Unedited Local Climatological Data (ULCD)

Quality Controlled Local Climatological Data (QCLCD)

Edited Local Climatological Data (LCD)

Record of Climatological Observations (COOP)

Global Historical Climatology Network Daily (GHCN-D)  

Also available are storm data, long term climatic averages and extremes, hourly precipitation data, monthly and annual climatic statistics for U.S. locations, weather maps and charts, wind data,  global daily climatic data, and U.S. historical climatology data.