Weathered Wound (3.5e Flaw)
From D&D Wiki
During Abnormal weather, you suffer a -1 penalty to AC and ATK. During Inclement weather, you suffer a -2 penalty to AC and a -1 penalty to ATK. During Stormy weather, you suffer a -3 penalty to AC, and a -2 penalty to ATK. During Powerful Storms, you suffer a -5 penalty to AC, and a -3 penalty to ATK.These effects take place even when you are sheltered from the elements inside of a standing structure, or underground.