302 



Abstracts of the Makerstoun Observations, 1843. 



TABLE XXXIV.— Daily, Weekly, and Monthly Means of the estimated surface of the Clouds, 



the whole sky covered being lO'O. 



Civil 

 Day. 



Jan. 



Feb. 



Jlarch. 



April. 



May. 



June. 



July. 



Aug. 



Sept. 



Oct. 



Nov. 



Dec. 



1 



[■••] 



3-8 



4-4 



10-0 



2-2 



100 



8-2 



100 



8-4 



[7-8] 



6-3 



3-2 



2 



4-1 



6-5 



9-2 



[7-7] 



4-2 



10-0 



[7-8] 



8-9 



7-8 



4-7 



7-9 



5-7 



3 



10-0 



4-8 



7-6 



6-2 



4-0 



100 



6-2 



7-5 



[6-2] 



9-6 



5-5 



[6-4] 



4 



4-3 



7-1 



0-9 



8-9 



5-8 



[9-9] 



4-8 



8-5 



2-9 



9-4 



6-8 



9-6 



5 



2-5 



[7-2] 



[5.3] 



7-4 



4-5 



10-0 



100 



4-6 



2-7 



9-5 



[5-8] 



7-2 



6 



9-9 



5-1 



90 



9-9 



7-9 



10-0 



7-4 



[7-7] 



6-8 



9-6 



6-6 



4-0 



7 



'7-1 



9-9 



5-4 



5-0 



[6-6] 



9-5 



9-3 



9-7 



11 



6-7 



5-1 



8-3 



8 



[6-1] 



10-0 



00 



7-7 



9-6 



7-7 



7-8 



9-9 



0-9 



[9-2] 



2-9 



4-4 



9 



7-7 



9-7 



4-6 



[7-0] 



6-7 



9-9 



[81] 



6-0 



0-8 



9-7 



5-8 



7-8 



10 



6-1 



8-0 



7-0 



5-9 



4-9 



7-5 



8-8 



2-7 



[3-6] 



9-9 



100 



[7-8] 



11 



3-3 



10-0 



100 



4-7 



4-7 



[8-3] 



5-2 



8-5 



91 



100 



9-6 



7-6 



12 



2-7 



[6-8] 



[6-5] 



8-8 



100 



100 



9-9 



1-9 



7-9 



5-8 



[7-2] 



9-2 



13 



100 



4-8 



7-2 



7-1 



100 



9-9 



6-5 



[5-6] 



1-8 



2-2 



5-4 



9-7 



14 



5-8 



40 



4-2 



9-5 



[9-1] 



4-6 



4-7 



3-3 



7-2 



1-5 



5-1 



70 



15 



[7-1] 



4-2 



6-2 



9-4 



10-0 



0-5 



4-7 



9-6 



4-4 



[4-0] 



7-6 



7-0 



16 



5-5 



5-3 



100 



[8-3] 



100 



4-8 



[6-9] 



7-6 



3-7 



5-5 



6-5 



40 



17 



9-3 



5-5 



9-9 



7-3 



9-9 



61 



100 



6-6 



[5-8] 



7-8 



5-7 



[7-9] 



18 



9-4 



31 



9-0 



8-5 



7-4 



[5-8] 



7-1 



5-6 



7-7 



11 



1-8 



9-7 



19 



8-8 



[7-3] 



[9-3] 



8-1 



6-9 



9-5 



8-4 



3-9 



6-3 



21 



[5-6] 



100 



20 



6-9 



10-0 



9-6 



8-6 



8-3 



7-9 



9-4 



[5-5] 



5-5 



8-6 



8-2 



9-6 



21 



4-8 



10-0 



9-5 



9-2 



[8-8] 



6-2 



71 



6-5 



4-3 



6-5 



71 



2-9 



22 



[7-0] 



100 



8-0 



10-0 



100 



5-3 



9-7 



8-9 



01 



[5-2] 



4-1 



7-1 



23 



6-5 



100 



7-8 



[7-9] 



100 



5-4 



[8-6] 



1-3 



0-3 



60 



5-9 



7-8 



24 



5-9 



9-9 



100 



6-3 



10-0 



2-9 



8-4 



3-8 



[4-8] 



6-6 



4-3 



[6-5] 



25 



9-2 



9-9 



50 



7-9 



9-5 



[6-5] 



71 



60 



8-1 



1-4 



7-2 



8-6 



26 



6-3 



[8-3] 



[6-7] 



5-2 



7-8 



8-7 



10-0 



5-1 



9-2 



1-4 



[5-3] 



7-2 



27 



9-3 



9-1 



100 



61 



100 



8-3 



5-6 



[5-1] 



6-8 



4-9 



6-3 



5-3 



28 



3-0 



6-5 



6-7 



7-7 



[9-0] 



8-6 



9-9 



9-2 



5-9 



9-5 



7-9 



5-8 



29 



[5-1] 





10 



8-9 



7-4 



8-1 



9-5 



1-9 



8-2 



[5-5] 



0-4 



8-2 



30 



1-5 





6-6 



[5-5] 



9-5 



9-3 



[8-8] 



4-5 



8-9 



9-0 



8-6 



3-5 



31 



6-5 





7-0 





10-0 





8-8 



8-9 





2-1 





[5-4] 



Mean 



6-40 



7-38 



6-88 



7-77 



7-82 



7-72 



7-87 



6-33 



5-26 



6-20 



610 



6-94 



The daily means in this table have been obtained from the 9 two-hourly observations__by the formula given 

 for the temperature, Table I. The daily means in the first week of January are the means of the 4 three-hourly 

 observations. 



Annual Variation of the Surface of Cloud. — The surface of cloud is a minimum in January, the maximum 

 in April, May, June, and July, the means for which four months differ little from each other ; the minimum 

 surface occurs in September, after which the surface increases till December. The following ai-e the means for 

 the three groups of seasons, namely, — 



The mean meteorological seasons, for which June, July, and August, constitute Summer. 



The meteorological seasons for 1843, for which July, August, and September, 



The astronomical seasons, for which May, June, and July, 



Seasons. 

 Spring, 

 Summer, 

 Autumn, 

 Winter, 



Range of Means, 



Mean Meteorological. 



7-49 

 7-31 

 5-85 

 6-91 



1-64 



Meteorological for 1843. 



7-77 

 6-49 

 6-41 

 6-89 



1-36 



Astronomical. 

 7-34 

 7-80 

 5-93 

 6-48 



1-87 



The astronomical group is the most distinct. The maximum occurs in summer and the minimum in 

 autumn of that group. The greatest monthly mean is that for July, being 7-87 ; the least is that for Sep- 

 tember, being 5-26. 



The mean for the year 1843 = 6-89. 



