The summary is:
1) This year's Boston Marathon will face challenging weather conditions of rain, wind, and cold temperatures that will make the race unpredictable.
2) Kenyan runners who have dominated the men's race in recent years are not used to running in such conditions.
3) Defending champions Robert Cheruiyot and Rita Jeptoo will have to contend with weather unlike last year's clear conditions, with forecasts of 3-5 inches of rain, 30-40 degree temperatures, and 25 mph wind gusts.
4) The difficult weather is certain to slow pace times from the leaders compared to last year's record time, though the Kenyan runners are still considered strong competitors.