CLIMATIC CONDITIONS OF THE UNITED STATES. 



317 



number of records so used is denoted by the number following the 

 average, in parentheses. It will be seen at once that many of our 

 5-week averages are rendered unsatisfactory in this way, because full 

 records are lacking. 



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itm-timir* II IB iS'iMii t IS ^^ lajura ij ze zmitt-s je n s* jise^i m si £BOcts le i9 se 

 Fio. 12. — Weekly precipitation and evaporation indices, summer of 1908, Miami, Florida. 



For the three 5-week periods (May 26 to June 29, June 30 to August 

 3, and August 4 to September 7) the records are generally more nearly 

 complete than for the earlier and later periods, and these three aver- 

 ages form the basis of our chart of summer evaporation intensities 



