296 Mr, Hanson* s Meteorological Results for Manchester. [April, 



The annual mean temperature is nearly 49-^°, being a little 

 more than 1° less than the mean of last year. The mean of the 

 first three months, 38-5° ; second, 54*4° ; third, 59-9° ; fourth, 

 44*5°; of the six winter months, 41*5°; six summer months, 

 57*1°. The maximum of 83° occurred on June 27, and the mini- 

 mum of 13° on Jan. 1 : difference of these extremes, 70°. 



The mean annual pressure of the atmosphere is 29*70 inches ; 

 highest point, 30*64 ; which occurred on Jan. 8 ; lowest, 28*45, 

 which was on Oct. 17 : difference of these extremes, 2*19 inches. 

 The mean daily movements of the barometrical oscillations mea- 

 sure nearly 44 inclies. Total number of changes, 1 12. 



The falls of rain, hail, snow, and sleet, during the past year, 

 have measured a little more than 32 inches ; which is something 

 under an annual average. Very httle rain fell during the first 

 three months of the year; but the following month (May) was 

 very wet, for there were nearly six inches registered. Upwards 

 ' of four inches fell in October. Total number of wet days for 

 the year, 181. 



The reporter, as usual, has again to notice a prevalency of the 

 south, south-west, and west winds. Out of 365 notations of 

 \ihe wind, 214 were noticed to blow from the above points. 



There has been more thunder and lightning, during the former 

 part of the year, than has been noticed in several former ones, 

 particularly in the month of May. Lightning occurred on six 

 days in that month, which were invariably attended with rain ; 

 sometimes it fell in torrents, and in three instances with hail. 



My friend, Mr. Edward Stelfox, of Lymn, near Warrington, 

 has favoured me with the above account of rain. Mr. S.'s rain- 

 guage is exactly the same as mine, and 1 can rely upon his 

 account as correct. His annual register of rain, for the year 

 1819, was 29*305 inches ; for the present, a httle more than 30 

 inches. Mr. Stelfox noticed the temperature on Jan. 1, 1820, to 

 be 13*5°; on the 3d, at 13°; and on the 22d of the same 

 month at 10°. 



• The column of rain, headed Ardwick, has been furnished by 

 my friend, Mr. John Dalton. His rain funnel is fixed about a 

 mile out of Manchester, in an easterly direction, and is situated 

 some little higher than mine. It has often been remarked, that 

 Mr. Dalton's annual account invariably exceeds mine sometimes 

 by five or six inches, as in the present instance. Mr. D. thinks 

 that his funnel being larger may in part account for the difference. 



However, I fancy, there is an error somewhere. It is much 

 to be desired, that one uniform plan could be adopted with 

 respect to measuring of rain. I have furnished a gentleman of 

 Crumpsall, near Manchester, with a funnel, and the same means 

 of measuring the rain as Mr. Stelfox uses: and, from his results, 

 it appears, that our accounts pretty nearly agree. 



Mamhcsier, Jr/zi. 1 7 , 1 82 1 . 



