1- The mean monthly temperatures for a watershed are given below: A) Calculate the PET for the months of January and February using the Thornthwaite Equation. (6 pts) B) Calculate

the total PET from January to March using the Thornthwaite Equation. (3 pts) C) Discuss the possible sources of error in your estimated PET for part A (PET you calculated for the months of January and February), given the fact that the Thornthwaite Equation requires only air temperature data and assuming that this watershed is located somewhere in California. (3 pts)