This would be a good time to visit Thanedar, as the temperature is moderate throughout the day and the weather is pleasant. The temperature may dip a little during night. Light woolens are recommended.
The weather is very cold during winters and the night temperature may drop as low as 2-3 degrees Celsius. There are good chances of a snowfall during January, because of which road travel becomes a little unreliable. If you do not mind the chill, then a trip can be planned during winter as well.
The days are mostly pleasant during these two months, but the night are pretty cold and temperature hovers around 4 degrees.