You can make a log of the weather all you want, but I'm with everyone else on here--you can't predict anything! Past and current performance is no guarantee of future weather. I'm a bride who got married in the week of solid rain last April that keeps getting mentioned. We picked April for many reasons, but one of which was that it's the month that's supposed to have the lowest rainfall out of the year. Ha! The rain blew sideways for days leading up to the wedding and some of our guests didn't see sun until the day they were leaving. Fortunately, the morning of our wedding was sunny and the rain held off just long enough for us to have our ceremony outside
I know all about wanting to watch the weather every minute leading up to your wedding, but trust me it will do you no good. The weather reports are never right. Your time will be better spent enjoying your time with your FI, planning your wedding, anything else! Just remember that for all you stress about it now, it won't matter one bit come your wedding day. You'll be marrying the love of your life and that's all you'll be thinking about!