METEOROLOGICAL OBSERVATIONS ON BEN NEVIS. 57 
28-326 inches at 6 a.m. on February 27. The extreme range on Ben 
Nevis was, therefore, 2-025 inches, and at Fort William 2:246 inches. 
The deviations of the mean temperatures of the months from averages 
of the thirteen years (1891-1903) are shown in Table IT. :— 
Tasie II. 
Fort Top of { Fort Top of 
William. Ben Nevis. | William. Ben Nevis. 
° ° Oo Oo 
January . d . —02 —07 July. ; é . —2:0 —19 
February . : . +46 +3°2 August . ; . —2°6 —3:2 
March . . . +11 +0°3 September : . +04 —07 
April : : . —2°4 —3'8 October . é . +12 + 0:3 
May : ; . +00 +02 | November : . —05 —1:2 
June : : . —15 -13 ~=«| December : . —16 —1%5 
The most remarkable features of the year as regards temperature were 
the low temperatures for April and the cold weather of the summer 
months. At both Observatories the April mean temperatures were the 
lowest recorded for that month since 1891, the shade minimum at 
Fort William registering frost from 12th to 18th, and on 22nd and 24th ; 
whilst on Ben Nevis the minimum fell to 12°-6 on 17th, and the maxi- 
mum rose above the freezing-point on only eleven days of the month, 
the highest shade reading there being no higher than 35°-0, on the 
6th and 9th. The absolutely highest temperature for the year at Fort 
William was 76°-0 on June 7, and at the top 58°-0 on the same day ; 
the lowest at Fort William being 21°3 on January 13, and at the top 
7°-7 on January 10. 
In Table III. are given for each month the lowest observed hygro- 
metric readings at the top of Ben Nevis (reduced by means of Glaisher’s 
Tables) :— 
Tape IIT. 
1903 Jan, | Feb, | Mar. | April| May | June | J uly | Aug. | Sept.| Oct. | Nov. | Dee. 
| | 
° ° °o °o | ° °o ° ° 
Dry Bulb. . | 19:1 | 42:2 | 236) 161 | 42:0) 47:3 368 | 437 | 186] sto | 20) 27-0 
Wet Bulb a “ 15°3 | 32-0 181 | 141 32°0 | 33°5 30°9 | 32°8 | 30°3 | 25°6 19:0 | 15:7 
Dew-point . . |-12°4 | 20:2 |-10°7 | -1°3 | 20°70 | 18:3 19°3 | 20°9 | 16:9 11-0 -6°2 | -20°9 
Elastic Force . . | 7024 | -109 | -025 | -041 | -108 | -099 | °104 | -112 | -093 | ‘071 -032 | -016 
Relative Humidity | 23) 41 21 46 40 | 30 42 | 41 37 41 | 26 14 
[Sat.= 100] | 
Day of Month , 8 9 Sue Gls 29 5 8 | 1 16 18} 18 29 
Month of Year. 23 17 17 1 2) 24 2 | 2 9 9 | 3 23 
Of these relative humidities, the lowest, 14 per cent., occurred on 
December 29 with a dew-point of —20°-9, that being the lowest dew-point 
for the year. From 9 4.M.on January 21 to noon on February 9—that is, 
for a period of 507hours—the atmosphere was continuously in a saturated 
condition, the summit of the mountain being wreathed in fog or mist 
throughout the period, except for one short break of three hours. The 
next longest periods of continuous saturation were from April 3 to 11, 
from September 3 to 10, and from December 9 to 17. 
The rainfall for the year at the top was 216-74 inches, or 55°97 inches 
above the average of 19 years; whilst the annual amount at Fort William 
was 113-89 inches, or 35:31 inches above the average for the same period. 
At Fort William the year was the wettest hitherto recorded, but on Ben 
