Your night temps are below freezing. How are you going to keep your base material from freezing. I am assuming since you said it's a large job you would have base material stockpiled on site. Of you can't excavate and compact your sub base and base material screed your concrete sand and lay your pavers in one day(that's above freezing) I would not recommend installing now. Wait till the spring. Once your base material freezes up you cannot get it compacted properly.
Last edited by clipfert; 02-17-2013 at 03:08 PM.