EXPERIMENT STATION BULLETINS. 



491 



of the temperature, rainfall, snowfall and frost conditions in the Upper 

 Peninsula. 



TEMPERATURE. 



The average temperature for the year, Chart I, shows that the coldest 

 section is the central-westerji portion of the peninsula where the eleva- 

 tion is one thousand to one thousand five hundred feet above the lake 

 level. The highest average temperature is found in the extreme southern 

 portions of Menominee county. The Keweenaw Peninsula, although ex- 

 tending far to the northward, has a mean annual temperature of forty 

 degrees, which is higher than the interior, northern counties of the 

 Lower Peninsula. 



Chart II shows the average minimum temperature during the grow- 

 ing season. The coolest weather, on the whole, is in the extreme north- 

 ern portions of Luce and Chippewa counties. The warmest section is 

 the extreme southern portion of the peninsula, in Menominee county. 



S'S " Eagle HarD or 



• Whiteflah Pt. 



(nominee 



Chart II. Average temi>erature during the growing season. 



The average daily maximum temperature for the growing season is 

 shown in Chart III. The effect of the lakes in keeping down the tempera- 

 ture is marked. It will be noted that the warmest sections, including 

 the elevated regions, are those in the southwestern portions of the 

 peninsula. There is a difference of ten degrees and more between the 

 average high point reached daily by the thermometer in Iron county and 

 northern Chippewa county during the growing season. Between the 

 extreme northern and extreme southern ends of Luce county there is 

 a difference of seven degrees in the average daily maximum temperature. 

 The chart brings out the fact that over most of the counties the tempera- 

 ture is not high enough to grow all farm crops. 



This fact is clearly shown in Chart IV, which gives the average daily 

 minimum temperature during the growing season. It shows the tempera- 

 ture is lowest over most of the sections which are highest on Chart III. 



