Those are good responses. Cold and wet is the rule, with low angle sun and the potential for snow (and black ice) anytime you get away from the coast, which you necessarily do. A lot of the sights are worth seeing (redwoods, coast highway, Lost Coast, Mt. Shasta and Lassen, etc.), but not that time of year on a bike. Try again in spring, summer or fall. When planning your trip, pay attention to altitude: the difference between sea level and 1500 meters elevation can mean the difference between (sometimes) warm sunshine and 6 meter deep snowpack which is still being plowed out in July.
On the other hand, sometimes you luck into a couple of good days in a row. It's been known to happen.
Hope that's helpful.