The story of this year’s Boston Marathon is pretty simple: Monday might possibly have been the best day, ever, in the history of marathon running, anywhere.The wind ? there was just enough of it to provide a tailwind at different points on the course; the temperature ? low to mid-50s, which is the gold standard for marathon running; the sun ? there was just enough of it to be a presence, but not so much that it was oppressive.Runners interviewed after the race say it’s no wonder that Robert Kiprono Cheruiyot (not to be confused with previous four-time winner Robert Kipkoech Cheruiyot) set a course record of 2:05:52.”I tell people that once every five years in Boston you get a perfect day for running,” said Marblehead’s Gary Freedman, who completed the course in 4:10:44. “And this was it.””It was an amazing day,” said Swampscott’s Rachael Paskievich (4:40:18). “I couldn’t have asked for better weather to run.””I thought the weather was perfect,” said Saugus’ Robert Catinazzo (5:09:21). “There was a tailwind at the end, a cross wind part of the way through ? the temperatures were ideal. Just a perfect day.”Of course, the weather is one thing. The variables, trials and tribulations people go through as they navigate the 26.2-mile course is something else again. Some, like Freedman, have run the race so many times there aren’t many surprises. And he feels he did as good a job on it as he ever has.Others, like Lynn’s Glenn Diamond, a veteran of 12 races, say the experience doesn’t matter. There are still surprises.”There are also surprises on Heartbreak Hill,” he said. “You don’t know how your body is going to react when you get there.”I think mine reacted pretty well,” though, said Diamond, who finished in 3:41:13, No. 3 among Lynners. “I think the weather might have had something to do with that.”Annie Rose Willis of Danvers, who grew up in Lynn, ran Boston for the first time (her second marathon overall) and said that despite a bad knee, she managed.”I’m just sore overall,” she said. “My time (4:12:04) wasn’t as good as my last marathon, but better than I could have hoped, considering the injury.”Willis was also a fan of Monday’s weather.”The marathon I ran that qualified me for this one was in October, and that’s the day that it snowed,” said Willis, a middle school track coach for the town of Danvers. “This was a lot better than that day was. I was pleased with this weather.”Kathleen Grenier and Paul Dulong are at opposite ends of the spectrum. Dulong finished his 22nd race Monday while Grenier, a Lynn native who now lives in Peabody, completed her first.Yet, in some ways, their experiences were similar. Both counted on family and friends to get them through.Dulong’s official time was 5:49.39, but “for the first time in years, I didn’t have to walk to run. It’s slow, but I did finish. I’m already looking forward to next year.”Dulong always meets his family – including his grandchildren – just before the firehouse turn as the course moves from Route 16 to Commonwealth Avenue in Newton. There, they gave him a long sleeved shirt to wear, because – unlike most of the others – Dulong thought it was a little chilly.”Especially,” he said, “when the sun went behind the clouds.”Both he and Freedman want to make it to 25 marathons, although Dulong, who is 58, is absolutely taking it one year at a time.”My grandson wants me to do 30,” he said. “I told him, ‘how about I get to 25, first.'”Grenier also had the support of family and friends, as did Paskievich.”A lot of my friends from St. Anselm came down, and of course, there was my family,” she said. “I had plenty of support.”I’d heard the crowds were fantastic,” she said, “but I never had any idea they were as important as they are. That support is overwhelming. They give you a push you didn’t know you had.”Grenier finished in 4:49:43, and wasn’t 100 percent happy with that.”But,” she said, “I had bad leg cramps around Mile 20. All in all, though, I thought it went pretty well.”She had f