If FY ^^' four digit numbe'i in if 

 I* ^ ' toulheaii corner oi eoch or 

 into 30-mifiute quadrangles, numben 

 gtvei A- minimum (empefOture, B-m 



column on the left g.ve the latitude and longitude of the 



degree-quadrangle. Each one-degree quadrangle ii divided 



i oi in the diogrom to the right. The columni of Iticte lobles 



■ imum lemperoture, C - number of yeori, - number of dojrt. 



DEPTH ZONE 



4n 



