Question

what is the average january temperature in the dekalb area?
a 22 degrees f
b 20 degrees f
c 25 degrees f
d 18 degrees f

Explanation:

Step1: Locate Dekalb on map

Find the approximate position of Dekalb area on the given January - temperature map.

Step2: Identify isotherm

Identify the isotherm (temperature - contour line) that corresponds to the Dekalb area. Based on the map, the isotherm passing through the Dekalb area is around 20 degrees F.

Answer:

B. 20 degrees F