20 NORTH AMEEICA]S^ FAUNA. [xo. I'T. 



Summaries of temperatures taken at AtJiahaska Landing, AlJjcrta, during the ' 



year 1900. 









Extremes. 





Montn. 



Mean daily 



Mean daily 







Monthly 



maximum. 



minimum. 



Maximum. 



Minimum . 



mean. 



January _ ___ 













February __ 













March _ _ _ _ . 













April 



54.7 



27.4 



75.0 



13.0 



41.1 



Mav 



68.7 



38.5 



78.0 



28.0 



53.6 



June - - 



68.9 



43.6 



8.5.0 



29.0 



56.2 



July 



72.4 



42.1 



84.0 



28.0 



57.2 



August - _ - _ - - 



67.9 



40.3 



81.0 



27.0 



54.1 



September 



57.9 



29.2 



78.0 



13.0 



43.6 

 35.6 



October _ 



49.0 



22.2 



67.0 



8.0 



November 



22.9 



2.2 



54.0 



—37.8 



10.3 



December _ _ _ _ _ _ 



23.3 



— 5'.9 



45.0 



—27.6 



8.7 



In this table the figures for the first three months are not available, 

 but this lack may be 'atoned for in a measure by presenting the cor- 

 responding figures for Edmonton, on the Saskatchewan, about 90 

 miles almost directly south of Athabaska Landing, though the former 

 locality, being more southern and considerably nearer the mountains, 

 is seen to have a slightly warmer climate. 



Summaries of temperatures taken at Edmontoii, Alherta, during the gear 1000. 









Tlxtremes. 





Month. 



Mean daily 



Mean dailvi 





Monthly 





maximum. 



mmimum. 



Maximum. 



Minimum. 



mean. 



January _ _ 



27.0 



7.2 



48.0 



-30.0 



17.] 



February 



16.0 



- 4.9 



40.0 



-40.0 





March _ __ 



30.7 



9.1 



55.0 



-20 .-0 



19.9 



April -__ 



57.7 



35.1 



7S.0 



26.0 



46.4 



May 



68.7 



42.6 



78.0 



32.5 



55. 1 



June - - _ - _ - 



70.7 



48.0 



86.0 



37.0 



59.3 



July 



71.7 



47.2 



82.0 



38.0 



.59.4 



August _ _ _ __ _ 



67.0 



45.2 



80.0 



33.0 



56.1 



September . _ _ 



59.7 



36.9 



76.0 



12.0 



48.3 



October _ _ . 



49.4 



31.4 



68.0 



22.0 



40.4 



November _ _ _ 



29.9 



13.6 



62.0 



-16.0 



21.7 



December- _ _ _ 



31.8 



14.5 



44.0 



- 9.5 



23.1 



Tear 







86.0 



-40.0 



o / . V 











The climate of the lower Athabaska may be fairly represented by 

 the data for Fort Chipewyan. giyen on a succeeding page. 



As intimately connected with the climatology of a region, data re- 

 garding the freezing and breaking up of the riyers are of interest. 

 In all northern riyers nayigation is interrupted, before the actual 

 closing of the stream, by drift ice. This is mainly ice which has 

 formed in the eddies and Avhich, by a slight rise of water, the usual 

 result of its formation, or from the accumulation of snoAy upon it, 

 becomes detached and descends the current, continually adding to its 

 own yolume. This continues until the increasing cold causes the 

 mass to jam and become solidly cemented. After the breaking up of 

 the riyers in spring the ice, of course, continues to run for a longer or 

 shorter j)eriod. 



