28 



MAY 



Maximum air temperature, 67° F. 



Minimum air temperature, 36° F. 



Average air temperature, 47.1° F. 



Visibility was less than 4 miles 36.4 per cent of time. 



Visibility was less than 2 miles 30.5 per cent of time. 



The ice-patrol vessels experienced very little fog in May until the 

 22d. From the latter date until the end of the month there was an 

 extraordinarily high percentage of fog, which brought the average 

 for the whole month slightly above the figures for March and April, 

 1930. 



Wind forces moderated greatly during May. The month may be 



said to have marked the transition from A\inter to summer conditions 



off the Grand Banks. See Figure 14 for a graphical representation of 



May weather. 



JUNE 



Maximum air temperature, 70° F. 



Minimum air temperature, 37° F. 



Average air temperature, 51.6° F. 



Visibility was less than 4 miles, 54.5 per cent of time. 



Visibility was less than 2 miles 40.6 per cent of time. 



The above figures can not be taken as those of the whole month of 

 June, for they are based on nothing more than the first 12 days of the 

 month. No record could be kept of the weather of the closing days of 

 June, because the last patrol vessel left the Grand Banks area on the 

 12th. 



There was one final storm on the 1st, after which the winds were 

 in general extremely light. The last week of the patrol was marked 

 by a high barometric pressure accompanied by an unusually high 

 percentage of fog. Figure 15 gives the weather conditions encountered 

 during the first 12 days of Jime. 



RADIO COMMUNICATIONS 



Reliable and efficient radio communication is by far the most 

 important factor in the conduct of the ice patrol. Every effort is 

 made to train and indoctrinate the radio personnel for the best pos- 

 sible performance of their arduous duties. 



The majority of the operators and radio electricians each year are 

 new to ice-patrol work. This makes the first patrol cruises by far the 

 most difficult. By midseason every man has become accustomed 

 to the schedules and to the character of the large volume of traffic 

 handled, especially the incoming water-temperature reports. 



At the beginning of the season it is normal for the number of mes- 

 sages to increase rapidly with the ability of the operators \mtil a peak 



