Birch Branch monthly averages Jan-Dec. Temp (C): 20 22 23 25 27 28 29 28 27 24 24 22; Precip (cm): 2 0 1 1 7 15 22 16 7 1 1 2. Find the average monthly precipitation for the four wettest months. Enter the number only. If needed, round to the nearest hundredth.