524 
PACIFIC SCIENCE, Vol. XV, October 1961 
18 
16 
14 
12 
LjJ 
u- 8 
6 
4 
2 
0 
Fig. 39- Summary of tidal features for 1953. 
1953 (JANrDEG ) 
HHHW 
continent bring cold periods during the winter, 
although generally the Coast and Cascade moun- 
tains provide considerable protection. Along the 
outer coast, the maritime conditions, which are 
present almost continually, result in high pre- 
cipitation, prolonged cloudiness, and small 
ranges in temperature- — -the typical conditions 
prevailing in the vicinity of Hope L (Figs. 26, 
29, 32, 35) and Hardy Bay (Figs. 27, 30, 33, 
36), despite the fact that these points are some- 
what on the lee side of Vancouver I. Along 
the inner coast and the lee side of Vancouver 
I., where there is some protection from the 
maritime influence, precipitation and cloudiness 
are somewhat reduced and ranges in tempera- 
ture are somewhat increased, as at Alert Bay 
(Figs. 28, 31,34, 37). 
The number of frost-free days in the whole 
Queen Charlotte Strait region averages 200-250 
in a year. In both outer and inner regions there 
are no months with all temperatures ranging 
below 0°C In the outer coastal region 4 to 5 
months have temperatures above 10 °C, and in 
the inner coastal region 5 to 6 months have 
temperatures above 10 °C In the outer coastal 
region, depending upon the locality, the mean 
monthly air temperatures for January are 1.7° 
to 4.4° C, and for July 13.3°C., and the mean 
daily temperatures are — 1 1° to 1.7 °C and 
15.6° to 18.9°C for the same months, respec- 
tively. In the inner coastal region, depending 
upon the locality, the mean monthly air tem- 
peratures for January are 1.7° to 3.3 °C., and 
for July 15.6° to 18.3°C., and the mean daily 
temperatures are —1.1° to 0°C and 21.1° to 
23.9°C, respectively, for the same months. 
Although some restricted regions of British 
Columbia on Vancouver I. average as much as 
264 in. of rain, in the Queen Charlotte Strait 
region the annual rainfall averages between 40 
and 60 in. at the inner end (including Alert 
Bay and Malcolm I.), with between 3 10 per 
cent as snow, and between 60 and 100 in. at 
the outer end (including Hope I. and Port 
Hardy ) , with less than 5 per cent as snow. The 
period of minimum rainfall is in the summer, 
1953 JUNE JULY AUGUST 
M = Midnight 
PACIFIC STANDARD TIME 
Fig. 40. Tidal features for the periods of greatest exposure during summer months of 1953. 
