Meteorological Observations. 



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Abstract of the Results of the Hourly Meteorological Observations 

 taken at the Surveyor General's Office, Calctilta, 

 in the month of December 1870. 

 Monthly Results. 



Inches. 



Mean height of the Barometer for the month... ... ... 30.026 



Max. height of the Barometer occurred at 10 a. m. on the 15th. ... 30.184 



Min. height of the Barometer occurred at 3 p. ar. on the 21st. ... 29.789 



Extreme range of. the Barometer during the month ... ... 0.395 



Mean of the daily Ma-x. Pressures ... ... ... ... 30.101 



Ditto ditto Min. ditto ... ... ... ... 29.969 



Mean daily range of the Barometer during the month ... ... 0.132 



Mean Dry Bulb Thermometer for the month ... ... ... 66.5 



Max. Temperature occurred at 3 p. m. on the 31st. ... ... 80.1 



Min. Temperature occurred at 6 & 7 a. m, on the 20th 57.0 



Extreme range of the Temperature during the month ... ... 23.1 



Mean of the daily Max. Temperature .. . ... ... ... 75.0 



Ditto ditto Min. ditto, ... ... ... .".' 5o'l 



Mean dally range of the Temperature during the month... ... it;. 5 



Mean "Wet Bulb Thermometer for the month ... ... ... 60.6 



Mean Dry Bulb Thermometer above Mean Wet Bulb Thermometer 5.9 



Computed Mean Dew-point for the month ... ... ... 55. 9. 



Mean Dry Bulb Thermometer above computed mean Dew-point ... 10.6 



Inches. 



Mean Elastic force of Vapour for the month ... ... ... 0.150 



Troy grain. 



Mean Weight of Vapour for the month ... ... ... 5.05 



Additional Weight of Vapour required for complete saturation ... 2'14 

 Mean degree of humidity for the month, complete saturation being unity 0.70 



o 

 Mean Max. Solar radiation Thermometer for the month ... 130.2 



Inches. 



Rained Wo day, — Max. fall of rain during 2-1 hours ... ... Nil. 



Total amount of rain during the month ... ... ... Nil. 



Total amount of rain indicated by the Gauge* attached to the anemo- 

 meter during the month ... ... ... ... ... Nil.' 



Prevailing direction of the Wind W N W, W by 2! & W. 



* Height 70 feet 10 inches above ground. 



