May is the beginning of what I call the rainy season. Much of the growing season precipitation will come from mid-May into mid-July. March and April the average rain and melted snow is around 1 inch in the west and around 1.3 inches in the east. But in May that increases to over 2 inches in the west and nearly 3 inches in the east. Then June that average jumps yet another inch before the rain amounts in July and August drop off quite a bit. Plus, in July and August, evaporation almost always exceeds precipitation in these parts. Granted, few areas want precipitation after a moist and cool spring so far, but eventually the late spring rains will be very welcomed.