It really varies. We go from mid seventies some days to mid 40s others... lows getting down to the 20s and 30s overnight. (All Farenheit measurements.) While I consider 60 degrees cold... I've also been in Florida for 28 years...
The cold is a dry cold, so you're better off with light layers than with one big jacket... an undershirt, long sleeve and light jacket is more than enough, usually.