12 METEOROLOGY. 



GOVERNMENT OBSERVATORY, SYDNEY. 



Latitude 33° 51' 41"; Longitude 10 h 4 m 46» ; Magnetic Variation 9° 32' 45' East. 



DECEMBEK, 1875.— General Abstract. 



Barometer... Highest Reading 30-215 On the 20th, at 9 a.m. 



., qno -rp i . Lowest Reading ... ... 29039 On the 27th, at 4 and 5 p.m. 



At6A * aM - Mean Height 29662 



(Being - 137 inch less than that in the same month on an average of the preceding 1G years.) 



Wind ... Greatest Pressure 211 lbs. on the 5th. 



Mean Pressure ... ... 1*0 lb. 



Number of Days Calm ... 



Prevailing Direction ... E.N.E. 

 (Prevailing direction during the same month for the preceding 16 years N.E.) 



Temperature Highest in the Shade ... 955 On the 1st. 



Lowest in tbe Shade ... 51'7 On the 9th. 



Greatest Range 322 On the 1st. 



Highest in the Sun ... 1320 On the 1st. 

 Highest in Black Box with 



G-lassTop 1937 On the 3rd. 



Lowest on the Grass ... 42 - 2 On the 8th 



Mean Diurnal Range ... 17'9 



Mean in the Shade ... 70*7 



(Being 1*3 greater than that of the same month on an average ofthe preceding 16 years.) 



Humidity ••• Greatest Amount 98'0 On the 31st. 



Least 28 On the 28th. 



Mean 60"9 



(Being 9-6 less than that of the same month on an average of the preceding 16 year;*.) 



Rain ••• ■ • • Number of Days ... ... 9 



Greatest Fall 0*947 inch. On the 31st. 



m f i -J? n f 1-300 inch. 65 feet above ground. 



■ L0talijail I 1-867 inch. 15 inches above ground. 



(Being 0470 inch less than that of the same month on an average of the preceding 16 years) 



Evaporation Total Amount ... ... 10-764 inches. 



Ozone ... Mean Amount 5 3 



(Being 08 greater than that in the same month on an average of the preceding 15 years.) 



Electricity . . Number of Days Lightning 8 



Cloudy Sky Mean Amount 5'8 



Number of Clear Days ... 2 



Meteors ■•• Number Observed ... 6 



Remarks. 



The weather at Sydney during the month was yery dry and hot with yery little 

 rain, excepting a heavy thunderstorm on the morning of the 31st, and the supply of 

 water in the suburbs has been very short. Hot winds were experienced on the 1st, 

 5th, 6th, and 28th, and although the prevalent wind was from the sea, E.N.E. , the 

 humidity was low and the evaporation nearly 11 inches. Hail fell on the 8th. In 

 the Western Districts tbe weather was unusually dry and hot, with prevalent W. and 

 N.W. winds. At most of the stations the rainfall was less than half an inch, and 

 the losses from the drought very great. At the Southern stations there was more 

 rain, especially on the coast. 



Sydney : Thomas Richards, Government Printer. — 1876. 



