Airflow matters more than oil

Yes, but the trick in humid climates is a light coating of oil and plenty of airflow.

The usual advice – dry thoroughly, rub with oil, store in a dry place – doesn’t cut it when the air itself is wet. I learned this the hard way in a coastal kitchen. Even a well-oiled pan can rust if it’s sitting in a closed cabinet collecting ambient humidity.

What works:

• After cleaning, heat the pan on the stove until all moisture evaporates (literally watch the water steam off).
• Rub on the thinnest layer of oil you can – wipe it on, then wipe it off like you made a mistake. Too much oil gets sticky and traps moisture.
• Store the pan in the open, not in a cabinet. Hanging on a wall with good air circulation is ideal. If you must use a cabinet, leave the door propped open slightly or use a mesh shelf.
• In truly humid basements or garages, throw a silica gel pack near the pan (not touching, just nearby). Replace it every few weeks.

Avoid storing with the lid on – that traps moisture like a terrarium. And never store food or water in a cast iron pan, even overnight.

The goal isn’t to seal the iron. It’s to let it breathe while keeping a microscopic oil barrier. In a humid climate, still air is the enemy.

If your pan starts to rust, scrub it off with steel wool and start over. But with this approach, you won’t need to.