Here is the data for the days I'll be there in January. Basically the temps are all over the place. As was mentioned perviously, check the weather before you leave to get a better idea.
AH - average high
AL - average low
M - mean
RH - record high
RL - record low
Jan Fahrenhiet
Day Sunrise Sunset AH AL M RH RL
8 7:20 AM 5:46 PM 72 50 61 85 32
9 7:20 AM 5:47 PM 71 50 61 84 28
10 7:20 AM 5:47 PM 71 50 61 83 34
11 7:20 AM 5:48 PM 71 50 61 84 29
12 7:20 AM 5:49 PM 71 50 61 83 23
13 7:20 AM 5:50 PM 71 50 61 82 23
14 7:20 AM 5:51 PM 71 50 61 83 20
15 7:19 AM 5:51 PM 72 50 61 84 28
16 7:19 AM 5:52 PM 72 50 61 82 30
17 7:19 AM 5:53 PM 72 49 60 83 30
18 7:19 AM 5:54 PM 72 49 60 83 26
19 7:19 AM 5:55 PM 72 49 61 85 24
20 7:18 AM 5:55 PM 72 49 61 86 20
21 7:18 AM 5:56 PM 72 49 61 84 19