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H. MOHN. METEOROLOGY. [2nd. ARC. EXP. FRAM 



The last row for each month gives the means for each hour and 

 for the years of observation. For the months January to June, and 

 November and December, these means are the totals divided by 4; but 

 for the months July, August, September and October, the means are 

 weighted means, being computed with the numbers of days in the last 

 column as weights. 



The means in the last row for each month show, for almost every 

 month, a well defined daily period in the relative humidity, with a mini- 

 mum some hours after noon and a maximum in the morning hours or 

 the night. By plotting the numbers and smoothing them, we get the 

 following Table showing the diurnal maxima and minima. 



January alone shows no appreciable period. 



The range is greatest in August, and smallest in the dark months. 



