epwmap is developed as part of Ladybug + Honeybee development. The goal of epwmap is to provide a single interface for all the available free .epw weather files.
Weather data are hosted by Department of Energy > http://apps1.eere.energy.gov/buildings/energyplus/weatherdata_about.cfm
Weather data information is parsed by Ladybug https://github.com/mostaphaRoudsari/ladybug
This page is using D3 library href="https://github.com/mbostock/D3 Check this link for mroe examples: http://d3js.org/