and possibly seasons (short cold winter nights long summer days) an extra layer of snow blocks covering the landscape after a snowfall, water table reducing in summer months etc
would also be kindof cool to have to plant certain crops in spring (gota be carefull not to make it too frustrating though and there would be no plus side to that only failed crops... whatabout a level in the polar circle- eternal sunshine in summer (quick build a fort) then a winter of darkness