Hi,
Yes, ambient temperature being too low can affect or sometimes destroy a fridge.
Restrict the air flow by blocking off the side panel top two vents leaving the bottom one open.
It may be wise to add a heat source such as a small light bulb to the exterior of the fridge.
Norcold does make a cold weather operation add on kit.
Regards, Don
My ride is a 28 foot Class C, 256 watts solar, 556 amp-hours of Telcom jars, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.