I would start right here on CDC, I like to look for patterns so I will go back as many years in the archives as I can; usually 4 or 5 years for what ever lake I'm planning on fishing, by now probably all of the lakes here in OK have some history on CDC. I then just look thru the post that are roughly covering the same time frame that I would be fishing that lake, if it's a popular lake you'll find a lot of info, if it's a smaller lake and doesn't have much info then you could pm some of the posters that have frequented the lake and see if they are willing to help. I just had a person pm me earlier for the same reason and like most of the CDC folks I tried to offer up as much help/info as I could.

Good Luck!