Why is the annual temperature range in London so much smaller than that in Moscow?

London is affected by the North Atlantic warm current and westerly winds, and has a temperate ocean climate, while Moscow is affected by the West Siberian Cold Current

London is affected by the North Atlantic warm current and westerly winds, and has a temperate ocean climate. The climate is characterized by small temperature differences among the four seasons, cool summers and warm winters. The air is humid and rainy and foggy, especially in autumn and winter.

Moscow is located in the middle of the Russian Plain, on the banks of the Moskva River, and across both sides of the Moskva River and its tributary, the Yauza River. Greater Moscow (including the area within the ring road) covers an area of ​​900 square kilometers, including 1,725 ​​square kilometers of peripheral green belts. The terrain is flat, with only the Teprostanskaya highland in the southwest (the highest point is 253 meters). It has a continental climate with annual precipitation of 582 mm and heavy snowfall. The average annual snow cover period is 146 days (early November to mid-April). Winter is long and the weather is gloomy. The average temperature in January is -10.2℃ (minimum -42℃), and the average temperature in July is 18.1℃ (maximum 37℃). The city's green area accounts for about 1/3 of the total area, making it one of the greenest cities in the world. When you look down on Moscow from an airplane, what you see is the lush green trees and clear, transparent rivers and lakes under the blue sky. The city is neat and clean. Winter is cold, with the lowest temperature reaching minus 43 degrees Celsius. High temperatures in summer. May and September are the best travel seasons. The cold period begins at the end of September every year and lasts until mid-May of the following year. Snowfall occurs from the end of November to mid-April, and at the end of winter the snowfall reaches a depth of 35cm.