50 



MANUAL OF THE NILAOIRI DISTRICT. 



Temperature 

 at Ootaca- 

 mand. 



The above table has been prepared from the daily records of 

 the rainfall for five years from July 1871 to July 1876 inclusive. 



The mean annual rainfall at Ootacamand for the last five years 

 has been 46*40, and the average number of days on which rain 

 fell during each of these years was 121*4. 



Dr. Baikie gives 47*78 inches as annual mean rainfall at 

 Ootacamand for seven years from the 1st June 1829 to the 31st 

 May 1836, or only 1*38 inches more than the mean annual fall 

 recorded during the past five years. This shows that the 

 seasons, after an interval of forty years, have altered but little in 

 regard to the amount of rainfall. 



According to the thermometric observations made by 

 Dr. Baikie, the mean maximum temperature for the years 

 1831, 1832, and 1833 was 67*16, and the mean minimum for the 

 same period was 48*05, giving a mean temperature of 57"60. 

 According to Mr. Ross, whose observations refer to the years 

 1853, 1854, 1855, and 1856, the mean maximum is 61*87 and the 

 mean minimum is 47*36, the mean temperature being 54-61. If 

 the mean between these results be taken as 56*10, we shall 

 probably have the correct mean temperature. There are some 

 later observations, but they bear unmistakable traces of error 

 arising from the unsuitable position in which the thermometers 

 were ])laced. 



In the absence of later trustworthy observations, the following 

 extracts from remarks by Professor Oldham on the observations 

 recorded by Dr. Baikie and Mr, Ross will be of interest as 

 proving the equability and temperate nature of the climate : — 



