Sarnia-Lambton is under its third cold alert of the season.
The medical officer of health issued the alert Friday with the temperature dropping to -15 C (5 F) and it remained in effect Saturday with Environment Canada forecasting a low of -16 C.
Residents should take precautions by dressing in layers, shielding exposed areas from the cold wind like the head, neck and face and by limiting time spent outdoors.
Overexposure to cold temperatures can be hazardous and can lead to frostbite and hypothermia.
Lambton Public Health advises local agencies that provide shelter and assistance to the homeless to prepare for an increase in demand.
