The annual march of the seasons and the passage of the subsolar point between the Tropics of Cancer and Capricorn affect these stations. Can you detect from your temperature graphs these seasonal effects

Subsolar point is point were the sun is believed to be directly over head and the rays of the sun strike at the perpendicular the surface.

Explanation:

The annual season is those that are divided into the summer, winter and the autumn and spring with the axial tilt of the sun and they are represented by the summer as starting from the 28th Feb and the winter in the 1st December with the spring on the 1st March and the autumn on the 31st August.   And the spring begins when the daily annual range of the temperatures rises above the 0 degrees and the summer when its plus 10 degrees. And thus areas the low and mid-latitudes, high latitudes as tropics, torrid and the frigid areas have been demarcated with the reference to the tropics of cancer and the Capricorn.

A,) cause a & b are equal & both gives 180°