Average January daily low temperatures in New Jersey.
The map is original work of Jim Irwin, December 2006.  It is based on the 1971-2000 normal January daily minimum temperature data from the PRISM Group, Oregon State University, http://www.prismclimate.org, created 4 Feb 2004.
Transferred from en.wikipedia to Commons by Apollo1758 using CommonsHelper.
The original uploader was JimIrwin at English Wikipedia.