I would be wary of the readings of moisture meters,Connor. I have a few,and they all read different. 4-5% is a pretty suspect reading,even for winter in Michigan. It hasn't been that cold yet. Even if it were dried in the kiln to say 6-8% ,as soon as it left it would likely start to gain and reach equalibrium at around 10% -12% considering the wet weather we had until a week ago. If you brought it inside and stored for a couple of days ,it would drop again. If you find your skin is itchy, your lips are chapped and your sinuses are bothering you (nose bleeds) your house is below 45-50% RH. Get a cheap meter from home depot and check it out. Humans do best in a RH of 45% -60% (rough guideline) and so does wood. If you get a week of -20 C the moisture in the house can drop to 10% Rh or less even with furnace humidifiers going full tilt. Venmar systems make it even worse. What kind of meter did you use? The pinless ones give false readings on wood that is narrower than the meter.