A 365-day tenor will include exactly one instance of any annual event, no matter when it starts. I'm just going to let this go. No insult intended, but if you don't understand the absolutely obvious fact above, trying to explain is futile.
I understand your point. I guess I'll have to plot out in excel using historical data Jan-Jan, Feb-Feb etc etc for the last 10 years and find if Jan - Jan optimum month.