温度
おんど · ondo · JLPT N3 · noun
temperature
🌡️ 温度 = warm + degree: how many degrees warm it is
温 (on) means warm, as in 温泉 onsen, hot spring. 度 (do) means degree, as in 30度. Put them together and you get the degree of warmth, which is temperature.
度 — 广 (shelter) + 庶 abbreviated (phonetic)
Originally depicted a hand measuring length under a shelter, meaning 'to measure' or 'a measure/standard.' From this came extended senses like 'degree,' 'extent,' and 'to pass through' (as in passing time). The reading 'dù' means degree/measure, while 'duó' preserves the older verbal sense of measuring.