﻿IVIeteorological Abstract for the Year 1897. 



Observations made at McGill College Observatory, Montreal, Canada. — Height above sea level 187 ft. 



Latitude N. 45° 30' 17". Longitude 4" 54"" 18-67" W. 

 C. H. McLEOD, Superintendent. 



J 





StX^.:::::;:: 



Iti^ 



April 



±:;;:;:::::::: 



41 71 

 5^.11 



July 



71) 9f) 



&^ber-:;:::: 



October 



November 



December 



63.94 



57.80 



IT Devia- 

 tion from 

 23 years 



+ 1.62 

 -I- 2.6S 

 + 2.42 



Me ns for 23) 

 years ending) 

 Dec. 31, 18>7.) 



iiS 



-23.5 



- 5.3 



- 9.7 

 10.9 



-i — 



0269 I 30.720 

 0864 30.887 

 9922 I 30.857 

 0268 j 30.5i8 

 9192 30.395 

 8765 ' 30.215 

 9064 30.343 

 9057 ! 30.190 

 1072 30.421 

 0666 I 30.644 



29.9802 I 



29.321 

 29.614 

 29.076 

 29.444 

 29.475 

 29.604 

 29.599 

 29. 6U 



ill 



B. 8ir w 

 S. 68i° \V, 

 S. 56i^ W, 

 S. 67i» W 

 S. 77° M' 

 S. 18J° E. 

 S. m' W. 

 S. 63^ W 

 S. 54J° W 

 S. 354° W, 

 S. 2S,' W, 



S. 57° W. 



2.12 

 4.05 

 3.27 

 3.74 I 

 3.76 1 

 4.42 I 

 1.95 

 1.15 



January 



February 



March 



April. 



&■::.■■ ■:.::: 



July 



August 



September 



October 



November 



December 



Sums for 1897" 

 Means for 1897 . 



Means for 23 

 years ending 

 Dec. 31, 1897. 



* Barometer readings reduced to 32° Fah. and to sea level, t Inches of mercury, t Saturation 100. § For 16 years only. IT "+" indicates that the temperature has been higher: "—"that it has been lower than the 

 average for 23 years inclusive of 1897. The monthly means are derived from readings taken every 4th hour, beginning with 3 h. m. Eastern Standard time. The anemometer and wind vane are on the summit of Mount 

 Royal, 57 feet above the ground and 810 feet above the sea level, u For 11 years only. 



The greatest heat was 93.0° on July 5: the greatest cold was 23.5° below zero on January 25. The extreme range of temperature was therefore 116.5° Greatest range of the thermometer in one day was 508° on 

 January IS ; least range was 2.5° on December 16. The warmest day was July 5, when the mean temperature was 82.B". The coldest day was January 19, when the mciin temperature was 12.7° below zero. The highest 

 barometer reading was 30.857 on March 7, lowest barometer reading was 29.076 on March ^5, giving a ranee of 1.781 inches tor the year. The lowest relative humidity was 27 on May 6. The greatest mileage of wind 

 recorded in one hour was 66 miles on January 26, and the greatesi; velocity in gusts was at the rate of 66 miles per hour on January 26. The total mileage of wind was 13u,566. The resultant direction of the wind for 

 the year was S. 57° W., and the resultant mileage 48,320. Auroras were observed on 11 nights ; fog on 30 days ; thunder storms on 19 days ; lunar halos on 10 nights ; lunar coronas ou 34 nights ; mock suns on 1 day. 

 The sleighing of the winter commenced in the city on December 1. The first appreciable snowfallol the autumn was on Novembei»9. Earthquakes were recorded on March 23rd, March 26th, and May 27th. all mtderately 

 severe. 



Note.— The yearly means of the above are the averages of the monthly means, except for the velocity of the wind. 



