noun
normal temperature; usual temperature
Refers to a standard, baseline, or average temperature, often used in medical, meteorological, or technical contexts.
平温は36.5度前後です。
Normal body temperature is around 36.5 degrees.
この地域の平温は年間を通じて15度くらいだ。
The average temperature in this region is about 15 degrees throughout the year.
Compound of 平 (へい, 'flat, normal, standard') and 温 (おん, 'temperature, warmth'). The exact historical derivation is uncertain, but the word is formed from Sino-Japanese morphemes.