July only 2'3F. The maximum and minimum temperatures 

 of Calcutta throughout the year will be found from the 

 following table : 



Maximum 



January 



February 



March 



April 



May 



June 



July 



August 



September 



October 



November 



December 



83F. 

 91" 



99 

 103 

 100 



9 8 



93 

 9 2 



93 fl 

 91 

 86 

 81 



Minimum 



S2F. 



$ 



73 



76 l 

 75 



* 



96 The maximum and minimum temperatures chiefly 

 determine the crops that can be successfully grown at a certain 

 locality. A temperature of over 90F. is not suitable for 

 growing wheat and a temperature of under 6oF. is not 

 suitable for the growth of rice. A temperature of 32F. z>. 

 frost, is unsuitable for the growth of all vegetation, though it 

 does not kill deep-rooted crops and trees, the roots of which 

 are securely lodged in warmer layers of soil. Evenness of 

 temperature of the layers of soil in which the roots of plants 

 are lodged is helpful to vegetation only when other conditions 

 are equal. 



97. The following table gives the temperature of the soil 

 of Calcutta at the surface and at the depth of 3 feet: 



Mean temperature Mean temperature 

 at the surface at a depth of 3 feet. 

 64-4?. 72'5F 



January 

 February 

 March 

 April 

 May 

 June 

 July 

 August 

 September 

 October 

 November 

 December 

 Yearly mean temperature 



K 



71-2 

 82-7 

 91-30 



904 

 875 

 86-2 



860 



8 3 -2 



73'3 

 648 

 806 



74-1 

 78-40 



84-5 

 8 7 -i 

 872 

 86-4 

 86 i 

 89-1 

 85-2 

 8 ro 



75'i 

 82-0 



