Seasonal Variations — TsEU 
285 
TIME 
Fig. 9. Comparison of observed Kaneohe and theo- 
retical Honolulu tidal curves. The upper three graphs 
compare the heights of the tides with the time adjusted 
so that the first tide of the cycle coincides. The bottom 
graph shows the actual difference in the time of the 
tide. The solid lines represent the Kaneohe data, the 
broken lines represent the Honolulu data. 
METEOROLOGICAL CONDITIONS 
Rainfall was measured by means of a stand- 
ard rain gauge installed on Coconut Island 
in April, 1949 (Fig. 1, C). Measurements were 
read at weekly intervals, and the results were 
graphed (Fig. 10) to show seasonal variations. 
Values on the graph topped by a heavy hori- 
zontal line indicate that the rainfall during 
the week was greater than 2.10 inches, the 
upper limit of the rain gauge. Rainfall ranged 
from 0.00 inches to more than 2.10 inches, 
with the heaviest rainfall in both years occur- 
ring during the winter months. 
Air temperatures were recorded by means 
of a continuous temperature recorder installed 
on April 3, 1949, in the net house (Fig. 1, B). 
Daily minimum and maximum temperatures 
were recorded and averaged to obtain weekly 
minimum and maximum temperatures, which 
were graphed to show seasonal variations. 
During the period studied, minimum air 
temperatures ranged from 19.3 to 24.3°C, and 
maximum air temperatures from 23-9 to 
30.7°C. Both of the years studied exhibited 
a rapid drop of temperature from the highest 
in September and October to the lowest in 
November and December. 
WATER TEMPERATURES 
Water temperatures were obtained by means 
of a continuous temperature recorder and by 
sampling at intervals. 
The water temperature recorder was in- 
stalled on April 3, 1949, in the net house near 
station 2 (Fig. 1, B). Both surface and bottom 
water temperatures were taken. Top and bot- 
tom values for each day varied very little, 
therefore they were averaged, and the results 
were averaged again to obtain a weekly mini- 
mum and maximum. These weekly tempera- 
tures were then graphed to show seasonal 
variations. Minimum water temperatures as 
recorded on the continuous temperature re- 
corder ranged from 21.5 to 27.0°C and maxi- 
mum water temperatures from 21.8 to 27.2°C. 
