IIO FLORIDA GEOLOGICAL SURVEY-TWELFTH ANNUAL REPORT 
Table of Mean Annual Rainfall by Months. Tabulated from U. S. Weather 
Bureau, Climatological Data, Florida Section, 1916. 
Mean Average Temperature Mean Average Precipitation 
January __58.4 degrees 3.11 inches 
February _59.9 degrees 3.60 inches 
March _65.4 degrees 3.15 inches 
April -69.6 degrees 2.41 inches 
May _«__75.8 degrees 4.00 inches 
June _80.0 degrees 6.58 inches 
July _81.5 degrees 7.14 inches 
August _81.4 degrees 7.55 inches 
September _79.5 degrees 6.98 inches 
October -73.0 degrees 4.09 inches 
November -65.3 degrees 2.14 inches 
December -59.6 degrees 2.61 inches 
Year -70.8 degrees 53.36 inches' 
Variation in rainfall is pronounced in Florida. This variation 
is due in part to normal seasonal variations, and in part to the 
influence of heavy tropical storms, especially those of the late sum¬ 
mer and fall. These storms or hurricanes, which, fortunately, are 
not of frequent occurrence, usually result in a heavy precipitation 
in the belt of country through which they pass. 
The maximum recorded precipitation for one year in Florida is 
probably that of 1912, at which time the average rainfall for the 
State was 64.88 inches (Climatology Report, 1912). The maxi¬ 
mum for any one station during this exceptional year was 91.61 
inches at Molino in Escambia county. The maximum recorded 
rainfall for any one month at a single station is 31.26 inches which 
is credited to August, although in July, 1916, the rainfall at Boni- 
fay in Holmes county was 30.6 inches. The rainfall of a single 
storm lasting somewhat more than one day has been known to 
exceed 10 inches. The rainfall for a period of twenty-four hours 
is known to have been as much at a single station as 13.18 inches. 
This rainfall was at Jupiter and recorded in October. As much 
as 3.90 inches is recorded as having fallen in one hour at Tampa in 
August. (Climatological Data, Section 84.) 
