One place I stop when looking for current and historical climate data is the Utah State Climate Center. This website contains an extensive amount of data. Some options for the researcher include building climate data sets, viewing radar loops, and dynamic climate reports.
Another interesting feature is the climate conversion tool. Conversion choices include temperature (including wind chill and heat index), moisture, wind speed, pressure, precipitation, and time. It is quite simple to use, just select the topic and input the appropriate information. To help understand the conversion process, the user can follow the “show equation” hyperlink for the mathematical details.
They also offer a list of other climate related websites which may be beneficial when doing this type of research.