Why is the Liaodong Peninsula warmer than inland Liaoning in winter?

The Liaodong Peninsula experiences warmer winter temperatures compared to inland areas of Liaoning primarily due to its maritime location.12

While inland regions of northeastern China are subject to the full intensity of the cold, dry polar continental air mass that dominates the region during winter, the peninsula's proximity to the sea exerts a moderating influence on these climatic extremes. This maritime effect helps maintain higher mean temperatures in coastal areas like Dalian compared to inland cities such as Shenyang.123