Here's a good source of information on paving temperatures as well and a wealth of other information.
Of course, lots of paving for commercial parking lots and the like gets paved at much lower than recommended temperatures as customers just have to get it done. Makes for ugly joints though. The thicker the mat, the more you can get away with cold temperatures. The higher the wind, the more troubles you will encounter. I've worked on paving projects where the snow was flying and the base was frozen solid and the job thirty years later is still in good shape.