1884.] A. N. Pearson — Variations of Bainf all in Northern Indiz. 201 



VI. — Variations of Rainfall in Northern India during the Sunspot 

 Period. — By A. N". Pearson, Esq., Officiating Meteorological Reporter 

 for Western India. Communicated by the President. 

 [Received October 6th ; — Read November 5th, 1884.3 

 (With PI. XI.) 



Mr. S. A. Hill, in his paper on the " Variations of Rainfall in 

 Northern India," published in the Indian Meteorological Memoirs, Vol. T, 

 showed very clearly the opposition that exists between the variations of 

 the winter and of the summer rainfall in Northern India during the 

 sunspot period. For the purpose of bringing forward with greater 

 clearness the main points of his investigation, he put the actual rain- 

 fall totals — which, as they stood, showed considerable apparent irregu- 

 larities — through a simple process of smoothing such as is frequently 

 adopted in dealing with statistical tables ; and, by so doing, eliminated 

 the apparent irregularities. But it appears to me that the unsmoothed 

 results present points of interest over and above those that are presented 

 by the smoothed results ; that, in fact, the apparently irregular variations 

 are regulated in a very definite manner. 



In the table here given, I reproduce the general means of Mr. Hill's 

 Tables II and IV, together with the smoothed results as he gave them 

 in the text. 



Variations of the Rainfall for each Year of the Eleven Year Cycle 

 in Percentages of the Local Means. 





Winter Rainfall. 



Summer Rainfall. 





i> 













Year of the 





Tj 





if 



n6 



6 

 o 



Cycle. 



o 

 o 



n 



o 



CD 



o 

 o 



a 



1 



§ 







1 



a 



CO 



o 



a 



1 





t^ 



M 



p 



^ 



cc 



Q 



1st 



— 17-6 



— 171 



— 0-5 



+ 0-8 



+ 3-6 



— 2*8 



2nd 



— 4-6 



— 13-6 



+ 9-0 



-i- 12-7 



+ 7-4 



4- 5*3 



3rd 



— 25-6 



-18-8 



— 6-8 



+ .3-3 



+ 9*8 



— 6*5 



4th 



— 19-5 



— 20-4 



+ 0-9 



+ 19-8 



-1- 12*6 



+ 7*2 



5th 



— 170 



— 7-8 



— 9*2 



+ 7-4 



+ 7-8 



— 0*4 



6th 



+ 221 



+ 23- 1 



— 10 



— .35 



— .5*6 



+ 2*1 



7th 



-i- 65-4 



+ 35-6 



+ 29-8 



-22-7 



— 10*8 



-11*9 



8th 



— 10-4 



+ 15-7 



— 261 



+ 5-6 



— 8*1 



+ 13*7 



9th 



-f 18-3 



+ 10-2 



+ 8-1 



— 210 



— 100 



— 110 



10th 



+ 14-9 



+ 4-9 



+ 100 



— 3-6 



— 7-0 



+ 3*4 



nth 



— 28-6 



— 14-9 



— 13 7 



-t- 0-2 



— 0*6 



+ 0*8 



