144 POOLE — ON METEOROLOGY. 



velocity of the wind was 153,457 miles ; or 17.5 miles per hour. 

 The fall of rai^ and melted snow averages 58.898 inches on 157 

 days; the fall of snow averaging 104.5 inches on 59 days. The 

 nights of frost average 185, or one half of the year. The degrees 

 of frost reckoned from 32 average 1998 degrees. Nights below 

 zero average 7.8; rimy frosts average 36.4; hail 6.8; silver 

 thaws 6.4 ; fogs 45 ; lightning and thunder 11.6; rainbows 9.2; 

 auroras 54; halos round sun 31.4, and halos round moon 8.6; 

 corona 3.4 ; wind veered with the sun 37.6 times, and backed 12 

 times. The average direction of the Avind was 126 days from 

 S. to W. ; 105 days from W. to N. ; 76 days from N. to E., and 

 58 days from E. to S. 



Upon comparing the mean of the year 1871 with the average of 

 the 5 years observations, it will be noticed that the barometer read 

 .0513 inch lower ; the thermometer .51 degree lower ; the tempera- 

 ture at night being .236° and at noon being '724°. The force of 

 vapour was .0037 inch less ; and the relative humidity was 4.75 

 per cent more than the average. 



The velocity of the wind is unusually high at this station, and I 

 have therefore thought it desirable to comment upon the gales more 

 in detail, than in former reports. 



In January the wind averaged 19.70 miles per hour for the 

 month. The greatest velocity recorded in 24 hours was 1257.60 

 miles on the 9th. The calmest day was 92.80 miles on the 12th. 

 The first gale began before dawn on the 6th, from S. S. W. 

 with snow and rain ; corrected barometer 29.982 at 2 p. m. Rain 

 ceased at 2 p. m. on the 7th ; wind veered round to W. N. W. and 

 calmed down. The thermometer did not register below 45 degrees 

 during the night of the 6th. The second gale began at 3 p. m. on 

 9th ; the barometer at 30.081, thermometer 23°, and wind N. by E., 

 then N. E. to N., N. W., and W. with snow for the 24 hours. 

 The third gale was on the 25th, W. N. W. The barometer read- 

 ing 30.067 ; thermometer — 7° on 26th ; the wind blew from the N. 

 all day : next day it backed to S. W., W., N. with snow and 

 moderated. 



In February the wind averaged 18.14 miles per hour. It was 

 unusually calm on the evening of the 17th. Wind registered 109.6 



