Manchester Memoirs, Vol. lix. (19 15), No. 5. 



V. Note on Foggy Days in Manchester. 

 By William C. Jenkins, F.R.A.S. 



(Received and Read January 261/1, rgrj. ) 



For some considerable time past numerous enquirers 

 have frequently made the statement, " that Manchester of 

 to-day was much less smoky than in years past." To 

 confirm my own opposite opinion I have collected and 

 compared in tabular form the number of days on which 

 fog has prevailed during the ten years 1904-13 inclusive. 



A distinction was made in this tabulation, by sepa- 

 rating the days on which fog prevailed in the ordinary 



Table I. 

 Monthly Averages of Foggy and Gloomy Days. 



-Period 1904-13. 1904-7. 1910-13. 



Month. Fog. T ?P° f ^ogand *> and Fosand 



° Gloom. Gloom. Gloom. Gloom. 



January 56 ... 1*2 ... 6*2 ... 3-8 ... 7-5 



February 3*9 ... o*8 ... _j*2 ... 3-3 ... 4*5 



March 3*5 ... 10 ... 42 ... 3-5 ... 4-3 



April ....: i*4 ... ri ... 2-5 ... 0-5 ... 38 



May o*9 ... 0*9 ... 1 8 ... o'S ... 33 



June o"2 ... o*9 ... i*j ... — ... 10 



July 0-4 ... 0-9 ... 1*3 ... 0-5 ... 2-5 



August 1*5 ... oS ... 2-2 ... o'5 ... 3-0 



September 3-3 ... 0*5 ... 3*8 ... 3*0 ... 50 



October 4-4 ... 0*5 ... 4-9 ... 4*8 ... 55 



November 7*3 ... r6 ... 7-8 ... 7*5 ... 7-0 



December 53 ... 10 ... 57 ... fro ... 4*5 



sense of the term, as a mist overlying the earth and 

 obscuring the distant vision from those on which dark- 



March y/h, 1915. 



