100 



ister has been established at 20 Signal Service stations, the list of 

 which is given in our tabular data. This tabular matter is omitted 

 from this present edition, and these records will undoubtedly be so 

 fully published as to be available to the student. Such photographic 

 sunshine records are complementary to the ordinary record of cloud- 

 iness and of personal observations of the area apparently covered by 

 clouds. But as the photographic register, strictly speaking, records 

 only the cloudy condition of the sky in the immediate location of the 

 disc of the sun, while personal estimates of the amount of cloudiness 

 refer to the whole sky (above an altitude of 15°, 30°, or 60°, according 

 to the various rules adopted b}' observers), therefore there is room for 

 quite a discrepancy between the personal and the photographic record, 

 and it is still a question as to which is more appropriate for agricnl- 

 tural study." 



In order to know the cloudiness, sunshine, and rainfall at a few 

 stations representative of the district in which cereals are grown in 

 America, I have added to the stations in the United States, which will 

 be published by the Signal Service, the following table for 1887 

 compiled for Winnipeg, Manitoba (lat. N. 49° 40', long. W. 97° 10'), 

 from the data published by Carpmael (1890), from whose report 

 other records may be obtained. 



Sunshine and climate of Winnipeg. 



Average duration of sunshine per hour in i)ercentage 

 of total possible. 



°®/ jiness. 

 days. 



January 0.00 



February T. 



March T. 



April 0.25 



May j 3.01 



June i 2.94 



July 1.98 



August , 1.49 



September 1.77 



October-.. 0.25 



November T. 



December.. T. 



P.ct. 

 40 

 42 



50 

 51 

 54 

 50 

 54 

 51 

 4.S 

 57 

 50 



la.m. I a. ni.:Ka. 



16 

 3 



30 45 



20 .55 



15 



-:! 

 71 

 44 



4;- I 

 2.;1 



Elaborate comparisons of these records were published from month to mouth 

 in the Monthly Weather Review during 1892-1897. 



