In 2011 I wrote a library that generates or extends the Lamb-Richman dataset using COOP station measurement data from the US (NOAA/NWS) and Canada (when available). Recently I got around to adding it to GitHub so anyone (especially those in academia) can use it to extend or regenerate the dataset further for climate science. The library is written in C# targeting the Mono framework on OS X but should work on Windows as well.