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You can insulate against drafts coming through your window wheels during the winter by using carpet padding, or something similar.
Fill in the opening at the bottom and top of your window with maximum expanding "Great Stuff" window foam to prevent drafts. (Later, once the window weights, with their new ropes, are in place I will insert 2 inch foam board in this channel--between the opening/channel pictured here and the window trim--for further insulation.)
Once both sides of your window have ropes in the channels, and you have sealed gaps in the window channel with "Great Stuff," loop the other end of the rope (the end not already nailed to your window) through the weight and tie a knot at the end--this knot will prevent the rope from slipping through your final two knots (see picture below).
Here you can see how the original end knot will prevent the rope from slipping through the final two knots.
Install the weight in the window channel. Use parafin (Gulf) wax, beeswax, or soap on the sides of your windows where they will rub against the window framing so to make it easier to open and close the windows.
My neighbor was intent on replacing all these windows below, like you see on the top photo. This side of his house dominated the view from my house. To try and prevent it, I offered to paint them for the cost of materials: