This is interesting to me because DH and I have a free pair of domestic plane tickets to use up this spring, and we were thinking Austin. (You are in Austin, right?) I've never been there and it sounds like our sort of city. If we decide to go, you know I'll be asking YLF Austinites for recommendations on what to pack. :-)
The way I look at it is that if you went to Florida or the Carribean or heck to Australia in February, you wouldn't think twice about wearing summer clothing, right? So if it's 80 degrees, then by all means wear summery clothing.
With that said, I will say that lately - even if the weather here is highly variable and one day it snows and next day it rains and today it's about 48 degrees - I have not been as motivated to wear winter colors. I don't know if this is that spring is near, or if I'm just in the mood for neutrals instead of all jewel tones I've been wearing all winter. I am finding myself opting for black, white, taupe, red and grey lately. They are seasonless colors, if you think about it.