whole vol. notes. north america 6$ 



Pressure. 



The monthly and annual mean pressures given in the tables are 

 derived from twice daily observations of the barometer cor- 

 rected for temperature and reduced to gravity at 45° Lat., 

 but not reduced to sea level. The elevation of the barometers 

 above sea level are given in the tables as " Hij." 

 Temperature. 



The monthly and annual mean temperatures are derived from 

 the mean of the daily maxima plus the mean of the daily 

 minima divided by 2. 

 The heights of the thermometers above the ground (ht) are 4 ft. 

 Precipitation. 



The total amount of precipitation for each month and the year 

 is given. The amount of rain is measured in a standard gage 

 (size not given) and to this is added the depth of snow- 

 divided by 10 as the equivalent of melted snow. 

 Observations After 1920. 



At most of the stations the data after 1920 were copied from the 

 published reports of the Canadian and United States weather 

 services, and are not so carefully checked as preceding data. 



NOTES AT STATIONS 

 BARKERVILLE, BRITISH COLUMBIA 



Hours of observation, 5'^ and I7'\ 135th meridian time. " No 

 changes in elevation. Gravity correction +.014." 



CALGARY, ALBERTA 



Hours of observation, 5'' 35'" and I7''35'", 105th meridian time. 



October 18, 1922 station moved to a height of 3428 ft. A removal 

 correction of + .039 applied to pressure readings. Gravity correction 

 + .009, (index and capillarity, .019). total +.028. 



CHARLOTTETOWN, PRINCE EDWARD ISLAND 



Hours of observation, 9'^ and 2i'\ 6oth meridian time. A removal 

 correction of +0.026 ajjplied to pressure readings. 



DAWSON, YUKON 



Hours of observation, 8'' and 2o'\, 135th meridian time. 



" Numerous changes have taken place at this station, but all readings 

 at 32° F. have been reduced to standard gravity and to the station ele- 

 vation of 1052 ft. Gravity correction +.045." 



