Here is a web site you may want to look at:
Maritime Safety Information
From the menu of options you will see the Altlas of Pilot charts
. Jimmy is a pretty smart guy and almost all the information you see in Cruising Route books
is derived from these free charts and the information you can download here. They do take some skill to work with and you may find the for pay guides are easier to understand.
This atlas gives you maps of wind
trends by season for almost evrywhere. They don't actually predict but they just give you the trends. That is all the guides do any way. You can also get the PDF version of Bowditch and a lot of seriously great things needed for navigation
from this link. This is all free stuff.