Sorry you didn't do as well as you thought you might. However, I suspect you might be right with the weather thing. In the perfect circumstance, you get to 'warm up' to not wearing a jacket. However, we've gone straight from winter to a summer sneak peak, and I know it can still mess with you!
Looks like a beautiful course! Excellent job with your 12674 @actifit steps for the day. Take care and enjoy the week ahead!