36 



Thus it will be seen that there are only 1 1 ^/o calm davs in 

 the year. In frequency, tlie south-west wind stands first, but tbe 

 north wind is not far behind it. Yet these two winds differ the 

 most widely from each other, the north wind being the coldest 

 (with an average temperature of 3 "4) and the driest, while the 

 south-west wind is the warmest (8^3) and one of the dampest; the 



Fig. 20. Xolso. The flat upper plateau of the island with Ostero fahitly visible in the background. 



As the surt'acc is swept by the wind it consists mostly of bare gravelly patches carpeted here and there 



with grass. (After a photograph by Warming.) 



difference in the temperature of these winds is greatest in winter 

 varying from 6^3 — 7^5 in December-March. 



All the figures given are from observations taken at Thorshavn, 

 whence we have the hest and longest observations. But as there 

 is a difference in the different parts of the islands I give, by way 

 of comparison, the mean temperature of two other piaces, Klaksvig 

 on Bordo (Nordreoer) and Kvalbo on Sydero, from which it appears 

 that Klaksvig is a little — but only a very little — warmer than 

 Thorshavn, while there is a considerable difference between the 

 temperature of the latter and that of Kvalbo. The difference ave- 

 rages 0^ 6, and, according to Willaume- Jantzen, is doubtless due 

 to the faet that the warm southerly winds are, comparatively speak- 



