4 METLOltOLOGiT. 



GOVERNMENT OBSERVATORY, SYDNEY. 



Latitude 33° 51' 41"; Longitude 10'' 4 m 40- ; Magnetic Variation 9° 32' 45' East. 



APBIL, 1875. — G-eneeal Abstract. 



Barometer ...Highest Beading 30273 inches on tho 18th, at 9 a.m. 



i, QO o -p r,. Lowest Reading 29*406 „ on the 26th, at 2 a.m. 



AtdZ ±ant. MeanHeight 29 . 861 



(Being 147 inch less than that in the same month on an average of the preceding 16 years.) 



Wind ••• Greatest Pressure ... 80 ibs. on the 14th. 



Mean Pressure 0'5 ft. 



Number of Days Calm ... 



Prevailing Direction . . . W. 

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



Temperature Highest in the Shade ... 78'7 On the 2nd. 



Lowest in the Shade ... 51'3 On the 29th. 



Greatest Range 17'8 On the 13th. 



Highest in the Sun ...1203 On the 2nd. 



H1 Glass To^^ B0X Wlth } 169 ° 0n the 3rd - 

 Lowest on the Grass ... 395 On the 29th. 

 Mean Diurnal Range ... 11*0 

 Mean in the Shade ... 65'0 



(Being the same as that of the same mouth on an average of the preceding 16 years.) 



Humidity ... Greatest Amount 100-0 On the 8th, 9th, and 30th. 



Least 54-0 On the 5th. 



Mean 805 



(Being 25 greater than that of the same mouth on an average of the preceding 16 years.) 



Rain Number of Days 19 



Greatest Fall 1122 inch. On the 30th. 



m f l -ci n f 4-117 inches. 65 feet above ground, 



lotai * an | ^ Q1 inches# 15 iuches above grouri d 



(Being 2'734 inches less than that of the same month on an average of the preceding 16 years.) 



Evaporation Total Amount 3'074 inches. 



Ozone ... Mean Amount 5'4 



(Being 0*5 greater than that in the same month on an average of the preceding 15 years.) 



Electricity Number of Days Lightning 9 



Cloudy Sky Mean Amount 7 6 



Number of Clear Days ... 



Meteors ... Number Observed ... 



HemarJcs. 



The weather during the month has been steadier and -more agreeable than the 

 previous months of the year. The rainfall is under the average for last 16 years : 

 the coast districts having had considerably more than the districts west of the Main 

 Range. Frost, for the first time this year, recorded at Orange and Queanbeyan (to 

 west of Main Range) . 



