ON METEOROLOGICAL OBSERVATIONS ON BEN NEVIS. 



69 



1891 



Jan. Feb. March April May June July Aug. Sept. Oct. Nov. 1 Dec. I Year 



Mean Pressure in Inches. 



Rainfall in Inches. 



Ben Nevis Ob- 

 servatory 

 Forr, William 

 Diff'n-ences 



Ben Nevis Ob- 

 servatory 

 Fort William 



Ben Nevis Ob- 

 servatory 

 Fort William 



25-204 



29-867 

 4-563 



31-3 



47-0 

 15-7 



64-9 



79-9 

 15-0 



5-6 



17-2 

 11-6 



178-02 



78-81 

 99-21 



Numher of Days 1 in. or more fell. 



106 

 138 



18 



908 



1,220 

 312 



43°-7 and 56°'2 were recorded at these places respectively. The minimum 

 temperature at the top was o°-6, and at the bottom 17°'2, both in March. 

 This gives for the top the unusually large range of 59°-3 of temperature 

 for the year at the top of the Ben, being nearly 10°-0 larger than for the 

 previous year. It may be here added that the minimum temperature re- 

 corded since the Observatory was opened was 3°-5 on ]\Iarch 27 at 6 a.m. 

 of the present year. 



The registrations of the sunshine-recorder show 908 hours out of a 

 possible 4,470 hours. In 1890 the number was only 591 hours. In 1891 

 the maximum was 212 in June, and the minimum 14 in January. In 

 February the unusually large number of 87 hours was recorded for this 

 winter month, this being 31 hours greater than the sunshine at Fort 

 William. At Fort William the number of hours for the year was 1,220, 



