ABSTRACT FOR THE MONTH OF DECEMBER, 



Meteorological Observations, McGill ^College Observatory, Montreal, Cauada. Height above sea level, 187 feet. 



1893. 



C H. McLEOD, Superintendent. 



19 Years means) 

 for and including > 

 this month S 



THERMOMETKR. 



Mean. Max. 



.7.67 

 3378 

 17.72 

 30.25 



-7 58 

 2.27 



23 7 8 



BAROMETER. 



30.2343 

 30.36^8 

 30.1258 

 30.2298 

 30-3215 



30.2027 

 30.1695 

 30.6640 



30 7«3° 

 30.1830 

 29.4998 



29.6568 

 30.237c 

 29.9913 



29.8517 

 30.33J5 

 29.9680 

 29.4863 



30.2887 



3°-334 

 30.385 

 30.813 

 30.882 

 30.3'7 

 29.867 



29.688 

 30 049 

 30.361 



29 923 



29.979 

 30.515 

 30.448 

 29.995 

 2 9-345 



29.801 

 29.550 

 30.009 

 29.903 



t Mean 



pres- 

 sure of 

 vapour. 



.0398 

 .0852 



•^337 



.0337 

 0238 



w. 



N. 



s.w. 



S.W. 



s.w. 

 s.w. 

 w. 



N.E. 



w. 

 w. 



N.E. 



N". 



S.W. 



S.W. 



N. 



w. 



s.w. 



N. 



s.w. 



s.w. 



N. 

 N. 



w. 



s.w 



Mean 

 velocitj 

 in mile:- 

 [jerhour 



o 15 

 0.43 



3 • • • Sunday 



ANALYSIS OF WIND RECORD. 



Direction 



N. 



N.E. 



E. 



S.E. 



S. 



S.W. 



w. 



N.W. 



Calm. 





1946 



1313 



173 



127 



945 



4291 



2907 



433 







Duration in hrs.. 



136 



69 



23 



12 



53 



209 



•93 



38 



6 



Mean velocity... 



'4-3 



19 



7-5 



10.6 



.6.3 



20. s 



14-. 



11. 4 





Greatest mileage i 

 and 21st. 



Greatest velocity 

 the 10th. 



one hour was 45 on the 10th 

 i gusts 60 miles per hour, on 



Resultant mileage 5,131. 

 heaultant direction. S. 80° W. 

 Total mileage. 12,135. 

 Average velocity, 16.3 m. per hour. 



* Barometer readings reduced to sea-level and 

 temperature of 32° Fahrenheit. 



§ Observed. 



t Pressure of vapour in inches of mercury. 



t Humidity relative, saturation being 100. 



IT 12 years only. 



The greatest heat was 41.0 on the 21th ; and 

 the greatest cold was —13.8 on the 14th, giving a 

 range of temperature of 54.8 degrees. Warmest 

 day was the 28th. Coldest day was the 13th High- 

 est barometer reading was 30.832 on the 14th ; low- 

 est barometer was 29.345 on the 16th, giving a 



range of 1.537 inches. Maximum relative humid- 

 ity was 100 on the 12th. Minimum relative humid- 

 ity was 59 on the 1st. 



Rain fell on 5 days. 



Snow fell on 23 days. 



Rain or snow fell on 24 days. 



Lunar halos on one night. 



Solar halos on two days. 



