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The prefix of "subfreezing" is "sub-," which means beneath or below.
It means below freezing level.
the hurricane led to a subzero temperature in ohio
Most food poisoning bacteria can't continue to grow and multiply at temperatures below 5°C. There are some exceptions such as Listeria.
Water can start to condense from the air when the temperatures drop below the dew point. It happens when the ground is cold or when the air above the sky is cold.
have you tried a place where the temperatures are below freezing for most of the year
The temperatures at the equator tend to be warm to hot (except where there are mountains); the temperatures at the poles tend to be below freezing.
Jump it, it will either start or it wont
Summer temperatures in Antarctica are cold, always below freezing and often below zero F. The Antarctic Peninsula, however, may experience temperatures above freezing for short periods during mid-day during summer.
Camcorders do not tend to work well in very cold temperatures.
Summer temperatures in Antarctica are generally below freezing.
Below 5 degrees Celsius (41 degrees Fahrenheit), most bacteria that are associated with foodborne illnesses would stop increasing in number.