METEOROLOGY. ' 



GOVERNMENT OBSERVATORY, SYDNEY. 



Latitude 33° 51' 41"; Longitude 10i> 4™ 46*; Magnetic Variation 9° 32' 45* East. 



JULY, 1875. — General Abstract. 



Barometer... Highest Reading 30537 inches on tlie 11th, at 10 p.m. 



. QQO -ni .. Lowest Reading 29-474 „ on the 29th, at 3 p.m. 



At 6 J, x&nt. Mean Heigllfc 30-008 



(Being 0-075 inch greater than that in the same month on an average of the preceding 16 years.) 



Wind ••• Greatest Pressure 14'0 lbs. on the 18th. 



Mean Pressure 0'6 ft). 



Number of Days Calm ... 



Prevailing Direction . . . W.N.W. 

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



Temperature Highest in the Shade ... 70"8 On the 14th. 



Lowest in the Shade ... 40-3 On the 17th. 



Greatest Range 20*9 On the 14th. 



Highest in the Sun ... 105-9 On the 14th. 



^Gkss Top 1 " 01 " B . 0X With } 142 ' 2 0n the 14th ' 

 Lowest on the Grass ... 30*4 On the 17th. 

 Mean Diurnal Range ... 13*2 

 Mean in the Shade ... 52 - 5 



(Being 0'2 greater than of the same month on an average of the preceding 16 years.) 



Humidity ... Greatest Amount 100 - On the 2nd, 21st, and 22nd. 



Least 49-0 On the 15th and 29th. 



Mean 795 



(Being 6-0 greater than that of the same month on an average of the preceding 16 years.) 



Rain Number of Days 15 rain and 4 dew. 



Greatest Fall 0-909 inch. On the 2nd. 



m , , -p, i, ( 1*057 inch. 65 feet above ground. 



"\ 1'611 inch. 15 inches above ground. 

 (Being 2-686 inches less than that of the same month on an average of the preceding 16 years.) 



Evaporation Total Amount 1'583 inch. 



Ozone ••• Mean Amount 57 



(Being 06 greater than that in the same month on an average of the preceding 14 years.) 



Electricity . . . Number of Days Lightning 6 



Cloudy Sky Mean Amount 4*8 



Number of Clear Days ... 6 



Meteors ••• Number Observed ... 4 



Remarks. 



The weather during the month was pleasant and agreeable. The rainfall at 

 Sydney was 2 686 inches below the July average of last 16 years. Shocks of 

 earthquake felt at Eden, Twofold Bay, on 11th and 16th, and gales, fogs, frosts, 

 snow, hail, and thunderstorms at some of the country stations. 



