Why can cold weather cause a governor to fail to cut in, and what is the temporary remedy?

1. The rubber governor diaphragm cracks due to the cold; the only remedy is replacement
2. Moisture freezes in the governor's internal exhaust ports; warming the governor body with a heat source is the temporary remedy
3. The cold air makes the air too dense for the governor to sense; the remedy is to restrict the engine air intake
4. Cold temperatures cause governor lubrication oil to thicken; the remedy is to spray water on it