温暖

1. Origins, structure, and basic meaning

• Structure: 温暖(おんだん) describes a mild, warm climate or regional weather conditions.
• Basic usage: It is used for a region that stays relatively warm in winter or a climate favorable to growing crops.

2. Common pitfalls and similar expressions

• More climate-focused than 暖かい
  • 暖かい(あたたかい) also broadly describes warmth directly felt in air, a room, or clothing. 温暖な気候 is a relatively objective description of a region's climatic character.