148 



ELEMENTS OF GENERAL SCIENCE 



In the summer months we find that the means are a little 

 lower at Grand Haven than at Milwaukee, and highest of 

 the three at Madison. In the case of these three towns, at 

 least, it appears that the lake may bring about lower summer 

 temperatures in its vicinity, particularly on the eastern shore. 

 We cannot be sure of a general law by studying three cities 



MINIMUM DAILY TEMPERATURE DURING A COLD WAVE IN 1913 



only, but from many such studies it can be stated that a 

 similar state of affairs is found to exist in all places in this 

 region. 



If it is the winter temperatures to which we give our atten- 

 tion, we find that again the west shore occupies an intermediate 

 position, the east shore is warmer, and the country away from 

 the lake much colder. In the table given above there is given 

 the record of the lowest point reached by the thermometer 

 on each of several days during a severe cold wave in the first 

 part of January, 1913. The illustration (fig. 77) represents 

 in diagrammatic form the conditions in three cities. It will 

 be noticed that the cold is less severe on the east shore than 



