Final answer:
If the temperature at ground level is cold and all other factors are constant, the atmospheric pressure is expected to increase due to the increased density of the air.
Step-by-step explanation:
In the open atmosphere, if the temperature at ground level is cold, we would expect the pressure to increase, if all other factors remain equal. Cold air is denser than warm air because its molecules are packed more closely together, meaning that for a given volume, cold air has more air molecules and hence a higher pressure.
This scenario is generally consistent with the gas laws where a decrease in temperature at constant volume increases the pressure (assuming all other factors, like volume and amount of gas, remain constant).