If you have the variables app.Tempreture_In, etc..., why not use them to compute the statistics?
If you only have the figures in a .fig file, you can get the (x,y) values by searching for the axes children.
Demo:
% Open figure
fig = gcf();
ax = gca(fig); % assuming the figure has 1 axes, otherwise, select the axes
objs = ax.Children; % object handles like lines, scatter, etc
x = objs(1).XData; % x-values for the first object
y = objs(1).YData; % y-values for the first object.
