624 METEOROLOGICAL OBSERVATIONS. 



7. Second German Expedition under Captain Koldewey. 

 Temperature, 



The winter quarters of the Expedition Avere at Sabine Island, 

 on the East Greenland coast, in latitude 74° 32' N., longitude 

 18° 49' W., but observations were made at various points of the 

 coast towards the north and the south. 



On comparing observations on the East and West Coast of 

 Greenland it is found that, except in the month of December, the 

 mean diminution of temperature for one degree of increase of 

 latitude is nearly the same on the East and West Greenland coast. 



The changes of temperature throughout the year at Sabine 

 Island are very regular, and can bo said to have only one maximum 

 and one minimum. The mean temperature is lowest in January, but 

 changes very little until the middle of March, being about — 13° F. ; 

 then it increases somewhat rapidly for three months, until the end 

 of June, to about 39*^ F. In August it descends again, not quite 

 so rapidly as it ascended, until November, and with a slight check 

 in December it again reaches its minimum toward the end of 

 January. 



The curves representing the mean temperatures for different 

 hours of the day are also very regular. 



In winter the coldest part of the day is from 2 p.m. to 2 a.m., 

 and the temperature almost remains constant throughout these 

 hours. There is very little change throughout the day. 



Throughout each season, the temperature at 8 a.m. and at 8 p.m. 

 is exceedingly near to the mean temperature for the day. 



The greatest changes of temperature during the day take place 

 in the spring, and both in spring and summer the temperature is 

 lowest at 2 a.m., and increases very steadily until 2 p.m., and 

 again diminishes very steadily until 2 a.m. 



In the autumn there is no change of temperature from 8 p.m. 

 to 4 a.m., then a gradual rise until 1 o'clock in the day, and an 

 almost equally gradual fall until 8 p.m. 



The coldest month is January, but February and March are 

 very nearly as cold, the lowest cold registered occurring in 

 February. The Avarmest month is July, and the highest 

 temperature 55 '6° F., on the 1st of July at 2 p.m. . . c. ',;{.,•.. vdrOlt 



Temperature and Wind at Sabine Island, ' . \ 



It appears that (p. 589) in autumn the north wind is the 

 warmest, and next to it the north-east and the north-west winds, 

 and that the south wind is the coldest. 



During east wind it is perfectly clear, and also during the 

 north-west wind. 



Two- thirds of the whole of the snow came from the north with 

 the warm winds. 



Whiter. — The south-east wind is warmest with a very high 

 barometer, and the north-west the coldest. During calms it was 

 cold and cloudy. 



