Relative Humidity. 



417 



Annual Variation of the Relative Humidity. — The relative humidity is a minimum in April and May, and 

 a maximum in December and January. The following are the means for the meteorological seasons : — 



Winter, Dec, Jan., Feb., 0-919 



Spring, March, April, May, 0*790 



Summer, June, July, Aug., 0*815 

 Autumn, Sept., Oct., Nov., 0-861 



The mean relative humidity for 1844 = 0-846. 



TABLE XV. — Mean Relative Humidity, Saturation being = 1, with reference to the Moon's 



Age and Declination. 



Moon's 

 Age. 



Mean 



Relative 



Humidity. 



Moon's 

 Age. 



Mean 

 Relative 

 Humidity. 



After 



Moon 



farthest 



North. 



Mean 



Relative 



Humidity. 



After 



Moon 



farthest 



North. 



Mean 



Relative 



Humidity. 



Day. 

 15 



0-869 



Day. 

 



0-830 



Day. 

 



0810 



Day. 

 14 



0-861 



16 



•851 



1 



•821 



1 



•834 



15 



•825 



17 



•857 



2 



•851 



2 



•827 



16 



•802 



18 



•851 



3 



•844 



3 



•846 



17 



•805 



19 



•856 



4 



•838 



4 



•847 



18 



•846 



20 



•845 



5 



•856 



5 



•827 



19 



•847 



21 



•836 



6 



•825 



6 



•840 



20 



•859 



22 



•829 



7 



•814 



7 



•834 



21 



•844 



23 



•866 



8 



■840 



8 



•842 



22 



•836 



24 



•834 



9 



•849 



9 



•867 



23 



•834 



25 



•839 



10 



•826 



10 



•863 



24 



•824 



26 



•843 



11 



•842 



11 



•839 



25 



•855 



27 



•844 



12 



•830 



12 



•860 



26 



•844 



28 



•839 



13 



•827 



13 



•869 



27 



•827 



29 



•828 



14 



•828 











Humidity with reference to the Moon's Age. — The following means of groups indicate that the humidity 

 was greatest a few days after full moon, and least between new moon and full moon : — 



12 days till 18 days, Full Moon, 0-845 



15 22 .- 0-849 



19 26 — 0-844 



23 29 ••• 0-842 



27 days till 3 days, New Moon, 0-837 



7 ». 0-835 



4 11 ... 0-836 



8 14 ... 0-835 



The results for 1843 and 1844 agree in making the humidity greatest about the third, and least about the 

 first quarter. 



Humidity with reference to the Moon's Declination. — The means of groups are — 



25 days till 3 days, Moon farthest North, 0-835 



6 ••• 0-833 



4 10 ••• 0-846 



7 13 ••• 0-853 



11 days till 17 days, Moon farthest South, 0-837 



14 20 - 0-835 



18 24 ... 0-841 



21 27 ... 0-838 



These means indicate a maximum before the moon is farthest south, and a minimum after it is farthest 

 south. The i-esult does not agree with that for 1843. 



MAG. AND MET. OBS. 1844. 



5n 



