WATER SUPPRY OP PASTERN AND SOUTHERN PRORIDA. 125 
little or no danger of frost before the latter part of October. 
Light frosts, however, may occur as early as the latter part of 
October. The earliest killing frost recorded, at this station, is 
November 2, while the average date of the first killing frost for 
the past fifty-three years is December 4. The latest date of a 
killing frost in the spring, at Jacksonville, is April 6, and the 
average date of the last killing frost is February 14. Light frosts, 
however, have been known to occur as late as April 28. 
At New Smyrna the earliest date of a killing frost in the fall 
is November 28, while the average date of the first killing frost 
for the past sixteen years is December 23. The latest date of a 
killing frost at this place in the spring is March 22. The average 
date of the last killing frost is February 16.* 
At Tampa the earliest date of killing frost recorded is No¬ 
vember 28, while the average date of the first killing frost is 
January 9. The latest date of killing frost in the spring recorded 
at Tampa^ is March 19. The average date of the last killing 
frost is February 8. 
At Miami the earliest recorded date of the killing frost in 
autumn is December 26, and the latest date in the spring is 
February 19. The killing frost at this locality is so infrequent 
that no attempt is made to determine the average date. 
At Key West, at the extreme southern end of Florida, frosts 
do not occur.f 
PRECIPITATION. 
The season of heavy rainfall in Eastern Florida includes the 
summer and early fall months. As a rule approximately one-half 
of the rainfall of the year comes during the four months, June, 
July, August and September. 
*U. S. Dept. Agri. Summary of the Climatological Data for the United 
States by sections: Section 83.—Northern Florida, A. J. Mitchell, Section 
Director. Also Climatology of Jacksonville, Fla., and Vicinity, Monthly 
Weather Review for December, 1907, by T. Frederick Davis. 
fUnited States Weather Bureau, Summary of the Climatological Data 
for the United States by Sections: Section 84.—Southern Florida, A. J. 
Mitchell. 
