It's simplistic to assume that "global warming" means we all get slightly warmer. Firstly, the effect is concentrated at the higher latitudes, and secondly, the true effect of that added warmth (how much is still under study) is added *energy* in the global weather system. The knock-on effect of this extra oomph appears to manifest in greater extremes: greater heat, unseasonable cold, odd winds (waaay too much east wind on the Great Lakes in the last ten years), and a general move away from "seasonality" to the sort of chaotic conditions we are noting of late.
As for the West Coast of N.A., however, that could be due to the large and persistent El Nino off Peru. I just read yesterday that NOAA is predicting it to continue to invert Pacific typical weather patterns until March 2007 at least.
I'm holding off buying those pilots and sailing directions keyed to each month. Might be readying for a reprint.