during the Quarter ending June 30, 1848. 187 



The weather during the first month of this quarter was a 

 continuance of the wet weather of the two preceding months ; 

 that during May was extremely fine ; and that in the month 

 of June was changeable, wet and dull. Till April 5, the daily 

 temperatures of the air exceeded the averages of the same 

 days of seven previous years by 11°*9, 12°*8, 15°'6, 16°*1 and 

 7 0, 2 ; on the 6th it was below the average, and for the most 

 part continued below, till May 2, at times to a great extent ; 

 from this time till the 30th of May the daily temperatures 

 exceeded their averages by quantities varying from 2° to 15°. 

 From May 30 to the end of the quarter the daily temperatures 

 were below their average values, with the exception of eight 

 days only. 



In pursuance of the arrangement I have hitherto followed, 

 I will speak of each subject of investigation separately. 



The mean temperature of the air at Greenwich — 



For the month of April was 47 0, 6, which is 0°'6, 2°*4, 0°-5 

 above those of the years 1841, 1842, and 1843 respectively, 

 4°«1 below that in 1844; l°-3, 0°-5, and 2°-3 above those of the 

 years 1845, 1846 and 1847; or it is o, 5 above the average 

 of these seven years; 



For the month of May was 59°*7, which is 2°-9, 6°'5, 7°'5, 

 6°-8, 10°*3, 5°'l, and 3°'3 above those of the years 1841 to 1847 

 respectively; or it is 6°'l above the average of these seven 

 years; 



For the month of June was 58 0, 5, which is 2 0, 1,.2°'2, and 

 o, 5 above those of the years 1841,1843, and 1847 respectively, 

 4°-4, 2°% 2°-2, and 6°'8 below those of the years 1842, 1844, 

 1845, and 1846, respectively; or it is 1°*6 below the average of 

 these seven years. 



The mean value for the quarter was 55°*3; that for 1841 

 was 53°-4 ; for 1842 was 55°«8 ; for 1843 was 51°'9 ; for 1844 

 was 55°*1 ; for 1845 was 52°'l ; for 1846 was 55°*7 ; and for 

 1847 was 53° # 2; so that the excess for this quarter above the 

 corresponding quarter in the years 1841, 1842, 1843, 1844, 

 1845, and 1847, was 1°'9, 1°'5, 3°'4, 0°'2, 3°% and 2°'l ; the 

 only year between 1841 and 1847 whose mean temperature for 

 this period exceeded that for the present year was 1846; the 

 difference, however, is small, being o, 4 only. The average 

 value for this quarter from the seven preceding years was 

 53 0, 6 ; so that the mean temperature of the air for the quarter 

 ending June 30, 1848, exceeds that of the corresponding 

 quarter in the preceding seven years by 1 0, 7. In the quarter 

 ending March 31, 1848, this value was found to be 1 0, 7 in 

 excess; and in that ending Dec. 31, 1847, it was found to be 

 3°*4 in excess ; so that the mean temperature of the air in the 



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