Consider the following premises. If it is windy, then John is a doctor. It is snowing or John is not a doctor. If it snows, then it is windy. Can we infer the following from them? If it snows, then John is a doctor.
 From the fact that it is snowing or John is not a doctor we can infer that if John were a doctor, then it is snowing. Finally, from the fact that if it snows, then it is windy, and that if it is windy, then John is a doctor we can infer that if it snows, then John is a doctor. Therefore, the answer is yes.