Stretch wrote:

Based on long term data logger use here, the times when ventilation
will work is from the middle of Otober to the middle of March.

We've been through this before. NREL says Wilmington NC has a 63.4 F
deep ground temp, with these long-term averages...

Apr May Jun Jul Aug Sep Oct

Avg daily max 74.0 80.8 85.4 88.5 87.6 85.2 76.9 F
humidity ratio 0.0080 0.0114 0.0147 0.0168 0.0167 0.0142 0.0099
vapor pressure 0.380 0.539 0.691 0.787 0.782 0.668 0.469 "Hg
dew point 56.7 60.6 67.7 71.5 71.3 66.7 56.7 F

Basically late fall, all winter and early spring. During that time,
you may need to worry about freezing pipes.

No. During that time, we'd move air near the basement floor upstairs
vs outdoors to store dryness in the basement.

Nick