A recent paper in Science Advances outlined a scenario where, given enough ice melting into the North Atlantic, average temperatures in cities like Bergen, Norway, could drop 15 degrees Celsius (a bone-chilling dip of 27 degrees in Fahrenheit). London could drop around 10°C (18°F).
Read the full article at: https://www.vox.com/climate/24099459/amoc-atlantic-meridional-overturning-circulation-freeze-europe