However, be prepared for the cold. The climate there is very cold in winter, 30 degrees below zero. Vladivostok is the largest port city along the Pacific coast of Russia. Vladivostok officially opened as a free port on 20 15, strengthening economic cooperation among China, Japan and South Korea. As the only ice-free port in Russia, it integrates military, Far East trade and fishery. The lowest annual average temperature is 1.38, and the highest is 8.38, which belongs to temperate continental humid climate.