Section III., 1914 



[73] 



Trans. R.S.C. 



Records of the Difference of Temperature between Mount Royal 

 and McGill College Observatory. 



By Professor C. H. McLeod and Professor H. T. Barnes. 



(Read May 27, 1914). 



In continuation of the reports 1 which we had the honor to submit 

 to Section III, we have pleasure in giving herewith the results of our 

 temperature records obtained during the year past. 



The records are complete for each month, with the exception 

 of July, which is too incomplete to give a satisfactory average. 



The averages for each month are computed from the curve of 

 difference, taking values for each hour of the day. 



The great majority of the values show colder on the mountain 

 but occasional large inversions help to reduce the differences. 



The following table includes the differences together with the 

 differences representing the deviation of each month, from the records 

 at the observatory for the past 39 years. 



Table of Differences. 



Note. — When the difference appears as positive it means that the average 

 temperature for that month has been above the average for the same month during 

 the past 39 years. 



1 Trans. Roy. Soc. Can., Vol. X (3) 71, 1904; Vol. XII (3) 141, 1906; Vol. I 

 (3) 3, 1907; Vol. II (3) 157, 1908; Vol. VII, 151, 1913. 



