Yet except for a few counties in the south and southwest, average temperatures on the rest of the island fall below 18 ℃ for several months a year, so the result of all the widespread cultivation has actually been rather meager harvests.
海南島種橡樹，除南部、西南部幾個縣，緯度仍偏高，每年有一到三個月平均溫度低於攝氏十八度，「廣種」的結果，卻是「薄收」。