Also, for everything you need to know, consider Boston Marathon: The Legendary Course Guide.
"Great book!" -- Dave McGillivray, Race Director, Boston Marathon
Course map copyright by Boston Athletic Association.
The Boston Marathon Course and Weather piece by Gordy Megroz in Outside Magazine's April 2013 issue extensively features our analysis of what to expect on race day, from start to finish, in sun, rain, sleet or snow. Further, it builds on our analysis of correlation between Boston Marathon weather and finish times, which was featured in Outside Magazine's April 2012 issue.