Icing has more to do with air pressure and humidity, less to do with temperature. Super cold days are far below dew point and the air is dry. Therefore when the pressure drops through a carb, or TB, there is no moisture to freeze. When the pressure drops like a carb or around a throttle plate, it causes the metal to loose heat to the low pressure air zone, if there is a high content of moisture, ice can form. I know about where @Awafrican lives, it's the dampness that makes his winters feel cold. If it was all about temperature, we would never be able to fly piston airplanes.
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