Okay, bear with me, this is no joke...

I notice that during certain times of the year, I could work my ass off in the gym and not grow worth a damn, while at other times during the year I can grow like crazy and not have to work as hard. This seems to correlate from now till the end of the summer... basically, warmer weather.

But, wait... this is not the crazy part. Ready? Maybe it's my imagination, but I could swear that during the times of optimal muscle growth during the year that my fingernails, toenails, and hair grow twice as quick also. So, my crazy questions are...

1) Has anyone experienced such a correlation? and
2) If so, what might be the scientific basis behind this?