METEOEOLOGT. 321 



aOVEENMENT OBSEEYATOEY, SYDNEY. 



Latitude 33° 51' 41" ; Longitode 10'' 4™ 46" ; Magnetic Variation 9° 32' 45" East. 



MAT, 1870^ — G-EFERAL Abstract. 



Barometer ■ . . Highest Eeading... . . . 30*345 inclies on tlie I5tli, at 8*55 a.m. 



At 32° Eaht. 



Lowest Eeading 29"537 „ on tlie 30th, at 11 a.m. 



Mean Height 29-999 



(Being 0-072 inch gi-eater than that in the same month on an average of the preceding 17 years.) 



Wind ... Grreatest Pressure ... 12-5 lbs. on the 7th. 



Mean Pressure ... ... 0'5 lb. 



Number of Days Calm ... 2 



Prevailing Direction ... W. 

 (Prevailing direction during the same month for the preceding 17 years W.) 



Temperature Highest in the Shade ... 76-6 On the 12th. 



Lowest in the Shade ... 49-8 On the 14th. 



Grreatest Eange ... ... 17*3 On the 3rd. 



Highest in the Sun ...111-3 On the 22nd. ■ 



Lowest on the (Srrass ... 40-1 On the 10th. 

 Mean Diurnal Eange . . . 10-4 

 Mean in the Shade ... 60-1 

 (Being 17 greater than that of the same month on an average of the preceding 17 years.) 



Humidity ■ . • Greatest Amount . . . 100-0 On the 7th and 20th. 



Least 51-0 On the 13th. 



Mean 82-4 



(Being 6*6 greater than that of the same month on an average of the preceding 17 years.) 



Rain • • . ... Number of Days ... ... 21 rain and 2 dew. 



Grreatest Fall 2-815 inches. On the 22nd. 



m , 1 p 1-1 ("10-435 inches. 65 ft. above ground. 



... "^13.266 inches. 15 in. above ground. 

 (Being 8-525 inches greater than that of the same month on an average of the preceding 17 years.) 



Evaporation Total Amount 1*795 inches. 



Ozone ... Mean Amount ... ... 7-5 



(Being 2*8 greater than that in the same month on an average of the preceding 16 years.) 



Electricity... Number of Days Lightning 2 



Cloudy Sky... Mean Amount ... ... 6-5 



Number of Clear Days ... 1 



Meteors . . . Number Observed ... 5 



MemarJcs. 



The weather this month has been unusually mild, with abundant rains generally 

 over the Colony, excepting the southern and south-western parts, where the drought 

 unfortunately still prevails. On the coast the rains have been specially heavy, 

 reaching a maximum of 19 inches about Port Macquarie, 17 inches fell at Cape G-eorge, 

 and 13 inches at Sydney. At other stations, with the exception mentioned, the 

 amount has varied from 3 inches to 12 inches. The mean temperature at Sydney 

 was 1'7° greater than the average, and the warm weather at the early part of the 

 month, combined with the April rains, brought many of the fruits into blossom (on 

 the 15th), which it is feared will prevent them blossoming in spring. 



