There is an important discussion of the significance of one of our findings (on the daily temperature range) in the paper
Fall, S., A. Watts, J. Nielsen-Gammon, E. Jones, D. Niyogi, J. Christy, and R.A. Pielke Sr., 2011: Analysis of the impacts of station exposure on the U.S. Historical Climatology Network temperatures and temperature trends. J. Geophys. Res., in press. Copyright (2011) American Geophysical Union.
in a post on Climate Abyss by John Nielsen-Gammon. His post is titled
and is recommended reading.