ABSTRACT FOR THE MONTH OF DECEMBER, 1890. 



Meteorological Observations, McGill College Observatory, Montreal, Canada. Height above sea level, 187 feet. C. H. McLEOD, Superintendent, 



THERMOMETER. 



Mean. Mas. Min. Range. 



•BAROMETER. 



Mean. Max. Min. 



ANALYSIS OF WIND RECORD. 



Direction 



Miles 



Duration in hrs . 

 Mean velocity .. 



Greatest mileage in one hour was 44 for four 

 consecutive hours on the 4th. 

 (Tieaiesl velocity in gusts, o'-i miles per hour 



S.W. 

 S.1V. 

 N.E. 

 N.E. 



53 7 j 



- .1 =. 



Resultant mileage, 5,915. 

 Resultant direction, S. 84° W. 

 Total mileage, 12,164. 



* Barometer readings reduced to sea-level and 

 temperature of 32° Fahr. 



§ Observed. 



t Pressure of vapour in inches of 



t Humidity relative, saturation being 100. 



ff Nine years only. 



The greatest heat was 35.4 on the 22nd ; the 

 greatest cold was 15.0 below zero on the 31st, 

 giving a range of temperature of 50.4 degrees. 

 Warmest day was the 10th. Coldest day was the 

 2nd. Highest barometer reading was 30.677 on 

 the 25th ; lowest barometer was 29-326 on thelOth, 



giving a range of 1.351 inches. Maximum relativ 

 humidity was 10u on 4 days. I 

 humidity was 54 on the 24th. 



Rain fell on 1 day. 



Snow fell on 19 days. 



Rain or snow fell on 19 days. 



Rain and snow fell on 1 day. 



Hoar frost on 2 days. 



Fog on 8 days. 



