304 



ON THE HYDROLOGY OF THE BASIN OF THE RIVER SAINT LAWRENCE. 



ANALYSIS OF THE FOREGOING OBSERVATIONS. 



1861. 



January, 

 February, 



March, . 

 April, . . 

 May, . . 

 June, . . 

 July, . . 

 August, . 

 September, 

 October, . 

 November, 

 December, 



Yearly Means, 



Monthly Mean of 

 Water at Noon. 



80.50 



30.55 

 31.20 

 33.80 

 48.80 

 61.60 

 66.60 

 69.00 

 61.10 

 48.00 

 36.60 

 31.90 



45.80 



Monthly Mean Temperature of Air. 



10.0 

 17.0 

 21.0 

 37.0 

 50.6 

 63.0 

 66.5 

 66.1 

 57.2 

 47.5 

 34.4 

 22.1 



Noon. 



a.m. 



40.96 



13.5 

 22.1 



25.8 

 42.5 

 56.4 

 69.4 

 70.7 

 72.1 

 62.3 

 51.0 

 37.1 

 25.8 



Noon. 



45.72 



3 P.M. 



15.2 



23.0 

 28.2 

 48.9 

 59.1 



72.0 

 73.0 

 72.6 

 64.1 



52.2 

 38.2 

 26.2 



47.30 



6 P.M. 



13.7 

 22.5 

 26.3 

 44.0 

 57.5 

 70.6 

 72.1 

 71.2 

 60.0 

 50.1 

 36.6 

 24.9 



6 p. 



45.80 



Monthly Mean 

 of Air. 



L2.90 



21.20 

 25.40 

 41.70 

 55.90 

 68.77 

 70.50 

 70.90 

 61.48 

 50.10 

 36.60 

 24.95 



45.03 



Mi-: an Temperatures between 9 a.m. and 6 p.m. 



Mean of Air, Nov., Dec, Jan., Feb., March Number of days 



(151 days), 24.2 At and below zero, . 



Maximum, . . , + 47.5 " " " 32°, . 



Minimum, , , , — 28.5 " " " 24.2°, 



Range, , , . , 76° 



April, May, October (92 days), . , . . , 49. 23 At and below 32°, . 



Maximum, .,,.... 73.5 " " above 49.23°, 



Minimum, 21.5 " " " 60°, . 



Range, 52° " " " 70°, . 



dune, July, August, September (122 days), . 67,91 At and below 50°, . 



Maximum, 91. " " above 67.91°, 



Minimum, 45.5 " " " 80°, . 



Range, ...,,,, 45.5° " " " 90°, . 



16 

 113 



75 



58 



19 



3 



4 

 86 

 14 



3 



Total number of days in the year below 32°, . . 121. 



Extreme Range of the year between 9 a.m. and 6 p.m., 119.5 



H " in any 24 hours, Summer, July 10 and 11, 20.5 



*' '* " " " Winter, January 10 and 11, 38.0 



Extreme Range of Temperature of "Water, 46°. 



Maximum Temperature, 75°. Minimum Temperature, 29 c 



Total number of days at and below 32°, 120. 



