There are a few subtle trends that you could extract from historical data, but nothing really notable stands out to me that would be worth spending much time researching deeper. There are the obvious things like loads of Christmas domains become available in Nov/Dec/Jan, Jan Sale domains tend to drop in Jan/Feb and you could probably find a trend around hot weather and tourism domain drops for example.
I also found that I had more success at catching during periods like Christmas and during hot beach weather when I guessed that most other catchers were taking a break and there was less competition.