CLIMATIC CONDITIONS. 



115 



The meaning- of the abbreviations used in the table to denote the kind and amount 



of clouds is as follows: 



A-cu =alto-cumulus. 



A-s =alto-stratus. 



Ci =cirrus. 



Ci-cu = cirro-cumulus. 



Ci-s =cirro-stratus. 



Cu =cumulus. 



Cu-n =cumulo-nimbus. 



N =nimbus. 



S =stratus. 



S-cu =strato-cumulus. 



=clear sky. 



1 =sky one-tenth cloudy. 



5 =sky five-tenths or one-half cloudy. 

 10 =sky all cloudy. 



The wind velocities here given were determined by estimate, but as some judg- 

 ment had previously been acquired by the observer in forming estimates of wind 

 velocity by noting the impressions it makes upon the person and the speed of light 

 objects transported by it, and then comparing the estimates thus formed with the 

 readings of standard anemometers, with which he had several years' experience, the 

 estimates here given are believed to be approximately correct. 



Since the barometric readings here given were made on an aneroid, where there 

 were no field facilities for its comparison with a mercurial barometer, they purport 

 to be of minor value only. 



In the preparation of the table for publication, suggestions have been contributed 

 by Dr. Cleveland Abbe, jr. 



Meteorologic observations along Chandlar and Koyukuk rivers essentially at 7 a. m. and 2 and 9 p. m. , from 



June 19 to September 23, 1899. 



Locality and date. 



Tempera- 

 ture. 



Clouds: Kind 

 and amount. 



Wind: Direc- 

 tion and 

 velocity in 

 miles per 

 hour. 



Barometer. 

 (Aneroid.) 



Remarks. 



Fort Yukon: 



June 19 



20,2 p.m. 



21,9 a.m. 



2 p.m. 



9 p.m. 



22,7 a.m 



Mouth of Chand- 

 lar River: 



June 22,2p.m 



9p.m 



23,7 a.m 



2 p.m. 



9p.m 



Degr. F. 



58 to 60 

 59 

 58.9 

 64 

 63 

 63.8 



74.5 

 56.6 

 64.2 



Cu. 9 .. 

 Cu. 8 .. 

 Ci-cu. 3 

 Ci-cu. 5 

 Ci-cu. 8 

 Ci-cu. 8 



Ci-cu. 4 

 Ci-cu. 7 

 Ci-cu. 4 

 Ci-cu. 3 

 Ci-cu. 7 



High. 

 High. 



Moderate. 

 Moderate. 











SW. 10. 





 SW. 15. 

 SW. 15. 







29.2 



29.15 



29.1 



29.15 



29.14 



29.12 



29.16 

 29.1 

 29.07 

 29.01 



28.98 



Blustery 



Blustery, showery 



Fine 



....do 



....do 



....do 



....do... 



Fair 



Showery. 



do... 



....do... 



