NO. 17.] 



TEMPERATURE OF THE AIR. 



483 



THE ANNUAL PERIOD. 



The following Table gives the mean temperature for each month during 

 the drift of the Fram, taken from the Tables on pp. 403 — 468. 



The Means in the Table are means for the month. Reducing them to 

 the middle day of the month, ^ we obtain the following numbers (PI. III. Mean 

 monthly Temperature. 1 mm. = 1° C). 



The mean for the year is — 19-°19. Latitude 82°40', Longitude 89°11'. 



Parabolic curves give 

 Mean Temperature of the coldest day — 36"°68. February 2. 

 Mean Temperature of the warmest day + 0'°20. July 15. 



Annual Range 36-°88. ^ 



The temperature is above 0° from June 6 to 24, or for 18 days. 



' Hann. Lehrb. d. Met. p. 99. 



2 The above monthly means, treated by harmonic analysis, lead to the formula [m reckoned 

 from the middle of January): 



