Well SA is recording 36°F but I'm a little to the Northeast of SA and we are usually 2 or 3° cooler or warmer than SA .You are actually a bit colder than we are...we're at 38* with a high of 42* expected. If the sun is shining that will be ok for us. By the end of the week we're due for another round of cold.
My weather station in my yard is reading 34°F. Your expected high is suppose to be our low tonight! 

......SA = San Antonio



merry christmas