Blood Type Facts: There are eight different common blood types, which are determined by the presence or absence of certain antigens, which are substances that can trigger an immune response if they are foreign to the human body.
Arizonaâs monsoon is the northern extent of the North American Monsoon, which begins in early June in central and southern Mexico.The monsoon is a season, during which the dry westerly winds that persist through fall, winter and spring shift to moist southerly winds, bringing thunderstorm activity into Arizona.
A unique feature of Arizona climate is the two periods of precipitation; one season is from December through March and the other during July, August and September. The proportion of winter precipitation decreases from west to east and the summer precipitation decreases from south to north (Plate 6).