94 



REPORT — 1902. 



Table I. — continued. 



1901 



Jan. 



Feb. March April May June July Aug. Sept. Oct, 



Nov. Dec. Year 



Rainfall, in Inches. 



Ben Nevis Ob- 

 servatory 

 Fort Willinm 

 Differences . 



20-12 



7-8G 

 13-14 



5-91 1 14-95 I 12-87 



2-09 

 3-87 I 



4-22 

 11-06 



5-62 

 7-49 



4-74 1 13-19 



1-44 

 3-33 



6-97 

 7-34 



4-54 



3-13 

 1-35 



12-93 



6-62 



7-62 



10-65 



6-64 

 4-05 



16-01 



9-65 



6-87 



16-09 



4-64 

 10-46 



Ben Nevis Ob- 

 servatory 

 Fort William 

 Differences . 



Ben Nevis Ob- 

 servatory 



18 



Mean Hourly Velocity of Wind, in Miles. 



>' 21 I 22 I 11 I 10 I 10 I 15 I 21 I 



18 



13 



25-43 1 166-43 



10-68 67-46 

 15-45 I 92-03 



54 



10 

 44 



15 



269 



235 

 24 



894 



1,197 

 303 



15 



81 



71 

 10 



This table shows for 1901 the mean monthly and extreme temperature 

 and pressure ; the amounts of rainfall, the number of days of rainfall, and 

 of days on which it equalled or exceeded an inch ; the hours of sunshine ; 

 the mean ramband ; and the mean velocity in miles per hour of the wind 

 at the top of the mountain. The mean barometric pressures at Fort 

 William are reduced to 32° and sea level, but those at Ben Nevis 

 Observatory to 32° only. 



At Fort William the mean atmospheric pressure was 29"889 inches, 

 or 0*032 inch above the average. The mean at the top was 25*325 inches, 

 or 0-020 inch above the average. The mean difference for the two 

 observatories was 4-564 inches. At the top the absolutely highest 

 pressure for the year was 26-037 inches in May, this being the highest 

 hitherto recorded in May, and the lowest 24-159 inches in December. 

 We may note that in 8 years out of 18 the Ben Nevis barometer has not 

 given a reading below 24 inches. At Fort William the absolutely highest 

 pressure was 30-552 inches in November, and the lowest 28*549 inches in 

 December. The differences of the extremes at top and bottom were 

 therefore 1-878 inch and 2-003 inches respectively. 



The deviations of the mean temperatures of the months from their 

 respective averages are shown in Table II. : — 



