Hairline horizontal cracks in plaster

I've noticed in the last few weeks that there are a few hairline cracks that run horizontally in both up and downstairs rooms. None of the cracks are bigger than 1-2mm but they seemed to have opened up a little more since the cold weather. I'm just curious as to how to monitor and what is the likely cause of horizontal vs vertical cracks? 

The house a 120 year old mid-terrace.


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