Why do isotherms shift north & south from season to season?

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An isotherm is an imaginary line drawn on a weather chart or map to join places of equal temperature. Temperature varies from season -as there is high temperature during summer & low temperature during winter with minor changes during transitionary seasons. We know that temperature is proportional to atmospheric pressure & inversely proportional to density.
                                                       A.P.=K*D*T
                                                          T=A.P*1/D
where,A.P.=atmospheric pressure;K=constant;D=density;T=temperature
     During the summer season in either of the hemisphere's the sun is vertically overhead of the tropic of cancer/capricorn.The land which has a low specific heat capacity & also being a bad conductor of heat re-radiates the heat to the atmosphere resulting in the spreading of molecules of atmospheric gases due to the heat energy. As molecules spread over a wide region it's pressure on the land becomes low resulting in high temperature inspite of compressive force applied on them by gravity.
                  During winter season in either of the hemisphere's the sun is not vertically overhead & the light which reaches the hemisphere enjoying winter has to traverse a long distance through the atmosphere as a result very little energy reaches the land .Hence, heating of the atmosphere becomes a dismal & air molecules contract & gets compressed due to lack of heat & overpowering of gravitational force resulting in high pressure & low temperature. In the large waterbodies the latent heat energy stored by the water is slowly being released resulting in high temperature due to low pressure being caused due to breaking up of molecules. Hence, pressure exerted is over a large area so it is small & temperature is high. Moreover, the warm ocean currents on the polewards movement path keep giving out sensible heat & latent heat to the immediate surroundings. thus, decreasing atmospheric pressure & moderating temperature in higher latitudes beyond 231/2(degrees)N-231/2(degrees)S.Insolation becomes more & more slanting in higher latitudes which in turn effect the heating & coling of land & sea. Thus, indirectly influencing isotherm shifts.
                   This is the reason why isotherms bend polewards over in winter & equatorwards over the oceans in summer. Over the landsurface the isotherms bend polewards over continents in summer & equatorwards over continents in winter.

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