1890.] Relations between the Hills and Plains of Northern India. 



35 



These figures shew that the minimum temperature was greatly below 

 the normal at the hill stations during the storm and largely above it in the 

 plains on the 30th and in Bengal on the 30th and 31 st, the excess being 

 greatest in the North- Western Provinces. The night temperature slowly 

 and steadily rose at the hill station frem the 31st to the 5th, when it was 

 above the normal. It was lowest in the Punjab on the 2nd and 3rd, in 

 the N.-W. Provinces on the 3rd and 4th, and in Behar on the 4th and 

 5th, and in Bengal on the 5th. These facts are most easily summarized 

 by the statement that a wave of cold was transmitted eastwards across 

 Northern India at the rate of about 300 to 400 miles per diem. 



The humidity data of the same stations for the same period are even 

 more interesting and instructive. The first of the two following tables 

 gives the humidity at 8 A. m. and the second the aqueous vapour pressure 

 at the stations named. The third table gives the amount of cloud at the 

 same hour and illustrates the rapid and complete clearing of the skies 

 which follows the cold weather storms of Northern India. 





Humidity at 8 A. M. 



Station. 



Jany. 

 30th. 



Jany. 

 31st. 



Feby. 

 1st. 



Feby. 

 2nd. 



Feby. 

 3rd. 



Feby. 

 4th. 



Feby. 

 5th. 



Murree 



Simla 



Lahore 



Roorkee 



Lucknow 



Patna 



Burdwan 



Calcutta 



98 

 28 

 93 

 94 

 85 

 91 

 83 

 87 



100 

 31 

 90 

 79 

 95 

 99 

 84 

 89 



99 

 13 



94 

 86 

 78 

 90 

 82 

 94 



83 



47 

 94 

 90 

 62 

 85 

 62 

 69 



84 

 42 

 92 

 94 

 81 

 83 

 73 

 69 



26 

 58 

 78 

 90 

 63 

 51 

 59 

 55 



35 



27 

 68 

 90 

 100 

 89 

 67 

 72 





Vapour tension at 8 a. m. 



Station. 



Jany. 

 30th. 



Jany. 

 31st. 



Feby. 

 1st. 



Feby. 

 2nd. 



Feby. 

 3rd. 



Feby. 

 4th. 



Feby. 

 5th. 



Murree 



Simla 



Lahore 



Roorkee 



Lucknow 



Patna ... 



Burdwan 



Calcutta 



•162 

 •049 

 •335 

 •391 

 •486 

 ■275 

 •505 

 •552 



•159 

 •043 

 •281 

 •261 

 •488 

 •525 

 •524 

 •642 



•146 

 •017 

 •276 

 •242 

 •316 

 •403 

 •480 

 •549 



•139 

 •087 

 •276 

 •281 

 •257 

 •308 

 •289 

 •357 



•149 

 •067 

 •245 

 •265 

 •322 

 •354 

 •354 

 •342 



•069 

 •148 

 •197 

 •259 

 •228 

 •237 

 •302 

 •309 



•099 

 •072 

 •219 

 •270 

 •300 

 •378 

 •299 

 •343 



