688 



STATE BOARD OF AGRICULTURE. 



Charts III and IV, showing the mean temperature of Michigan for 

 January and July, respectively, show the lake effect more clearly. In 

 the former the lines bend sharply northward along Lake Michigan, as 

 the temperature is higher on the lake shore. In the Lake Superior 

 region the isotherms parallel the shore line, the temperature of the 

 coast cities being four to six degrees warmer than interior points but 

 a few miles distant. Just the opposite conditions are shown on the 

 chart for July. Here the lines bend sharply downward along the Lake 

 Michigan shore, the temperature being as low at South Haven, for 

 example, as at West Branch, an interior station more than 100 miles 

 farther north. 



CHART III. -Mean teD5)erature for the month of 



January, 



