HARD (ER) KANJI - JLPT 2 KYUU

REMEMBER:
The 3 strokes to the far left mean water; the upper right is the sun; the lower is a plate. So think of a dish of water boiling in the sun
あたたかい:おん warm; temperature
気温 ki on - temperature
温泉 on sen - Onsen, hot spring
温度 on do - temperature (degree)