the Mean Annual Temperature Variation. 493 



The temperature curve of Barnaoul belongs therefore to two 

 climates. During the months of April to October it belongs 

 to the excessive continental climate of Nertchinsk, while in 

 the winter it belongs to a less continental climate. 



The following diagram (fig. 4) gives the daily means of 

 temperature in Nertchinsk for the months of May and 

 June. 



Fig. 4. 



The diagram shows that the increase of temperature pro- 

 ceeds by steps. Going up the curve slides down here and 

 there and goes up again. The total depression of the yearly 

 amplitude, due to these steps, may be estimated at 17°. 

 this estimate and supposing that a curve of 



Admitting 



