164 



Abstracts for Humidity, Wind, and Clouds. 



TABLE XIII. — ^Mean Kelative Humidity for periods of Three Months, for the Summer and Winter Months 



1842, and for the Year 1842. 



Periods. 



201'. 



23^. 



2i>. 



5^. 



Mean of the 

 Four Hours. 



1841. 













July, Aug., Sept. 

 October, November 



0-873 

 -916 



0-798 

 •861 



0-759 

 •830 



0-772 



-875 



0-800 

 •870 



1842. 













Jan., Feb., March 



•882 



•840 



•798 



-821 



•835 



April, May, June 

 July, Aug., Sept. 

 Oct., Nov., Dec. 



•830 

 •875 

 •878 



•719 

 •769 

 -825 



•653 

 •707 

 •767 



-668 

 •719 

 •821 



•717 

 •767 

 •823 



Jan., Feb., March, ) 

 Oct., Nov., Dec. / 



•880 



•832 



-782 



•821 



•829 



April, May, June, ) 

 July, Aug., Sept. J 

 The Year. 



•852 

 •866 



•744 



•788 



•680 

 •731 



•693 

 •757 



•742 

 •785 



The humidity is least about 2^ in winter, and between 2^ and 5'' in summer ; and is less in summer than in winter. 

 TABLE XIV. — Force of Wind at the Observation Hours, and Maximum Force between the Observation Hours. 



Month. 



ao*. 



23t>. 



2". 



Sh. 



5i> and 20>'. 



201' and 23\ 



23h and 21'. 



21' and 5^. 





lbs. 



lbs. 



lbs. 



lbs. 



lbs. 



lbs. 



lbs. 



lbs. 



May 



0-3 



0-4 



0^6 



0-4 











June 



0-3 



0-4 



0-6 



0-5 











July 



0-5 



0-6 



0-9 



0-7 











August 



0-4 



0-6 



0-7 



0-7 











September 



0-4 



0-6 



0-8 



0-7 











October 



0-4 



0-8 



0-8 



0-6 











November 



0-4 



0-4 



0-5 



0-3 



1-2 



0-8 



1-0 



1-1 



December 



1-2 



1-2 



10 



1-1 



3-2 



2-1 



2-2 



1-8 



Means 



0-5 



0-6 



0-7 



0-6 



2-2 



1-4 



1-6 



1-4 



The force of wind was estimated from May till the 21st of October, afterwards the pressures are from the 

 Anemometer. The quantities from the Anemometer are lbs, pressure on the square foot of surface ; the estima- 

 tions have nearly the same value. 



A maximum seems to occur about 2'^. 



TABLE XV. — Mean quantity of Clouds from May till December 1842 at the Observation Hours. 













Mean of the 



Month. 



20h. 



23i>. 



Sh. 



Sh. 



Four Hours. 



May 



7-5 



6-5 



6-6 



6-5 



6-8 



June 



6-0 



6^3 



5-5 



66 



6-1 



July 



8-1 



8-1 



8-1 



6-7 



7-7 



August 



7-4 



7^9 



7-3 



7-3 



75 



September 



8-2 



8^8 



8-4 



71 



8-1 



October 



6-3 



5^5 



6-2 



7-3 



6-3 



November 



80 



7-6 



7-8 



8-5 



8-0 



December 



7-4 



7^2 



7-0 



7-5 



7-3 



Means 



7-4 



7-2 



7-1 



7-2 



7-2 



A maximum in the quantity of clouds seems to occur about 23'^ in the months of June, July, August, and 

 September, and a minimum about the same hour in the other months. The means for the 8 months at all the 

 hours are almost exactly those for the month of December. 



