RECORD AND DISCUSSION OF TEMPERATURES. 



27 





60 



3 



Son eelow the hokizos. 



Sun above the noRizoN. 



The absolute maximum value of the amplitude was observed in April (9°. 09), 

 and the absolute minimum in November (1°.00) ; the diurnal variation never dis- 

 appearing altogether, although the sun remained for 21 months below the horizon. 

 A secondary minimum was reached in July (.3°. 37), somewhat later than the 

 middle of the time the sun made his circuit round the points of the compass with- 

 out setting.^ The mean amplitude of the diurnal variation during the whole year 

 is 4°.20 — the maximum rising 4°. 9 above, and the minimum foiling 3°. 2 below. 

 The daily range of the effect of the thermal wave propagated northward during 

 the long arctic darkness, may be set down to 1°.6 on the average. 



For the purpose of comparing with similar results at other stations, I add a table 

 of the mean daily variation during the year. Each figure is simply the mean of 

 the twelve values corresponding to the same hour, and was taken from the preced- 

 ing table. No attention was paid to the small anomalies noticed in three winter 

 months, which cannot sensibly affect the means. The second column contains the 



mean values, and the third 



the same after the general mean has been subtracted 



from each of them, and, consequently shows the mean variation proper, + indicat- 

 ing a •( , ° ^ > value than the mean. The fourth column exhibits the hourly 

 I lower i -^ 



differences of the variation. 



' A more complete understanding of the dinrnal variation can only Ix; had in connection with hygro- 

 metrio oteervations. 



