You'll be fine..and I mentioned this before... your only problem will be listening to the guitar players whine about how cold there fingers are..
It's at the business plays one of the band members owns - so not contract opt out. Just looked and the low is in the low 50's so I should be good to go.
I remember one winter gig many years ago where it was also windy and we ended up needing to fold nails over the legs of the cymbal stands as they kept trying to take off. Wild to watch as they didn't just tip over, the weight of the stand underneath acted like a kites tail and they would literally lift off the stage and start motoring across.
I'm playing a gig outside on Friday night. It's not supposed to be too terribly cold - lower 50's. Would you wear gloves or use some hand warmers? At least I don't have to take my fan to the gig!