I would suspect any silicon diode would work, even a 1N4001 type power diode. There is no need for microwave speed in a wind speed circuit. But link to a schematic if you want 100% for sure correct answer under all conditions. 
Lefty
I would suspect any silicon diode would work, even a 1N4001 type power diode. There is no need for microwave speed in a wind speed circuit. But link to a schematic if you want 100% for sure correct answer under all conditions.
Lefty