That depends on if a cold front comes through, one time it was in the 40's and blowing 25, in other years it's been in the high 80's with no wind, so you need to check out the forecast and dress accordingly.

I think the average temps for mid Jan. are about 75/65.

Here's a Link:

http://www.weather.com/outlook/health/fitness/wxclimatology/daily/USFL0225?climoMonth=1