Continental climate

A continental climate is a specific type of weather pattern found in large landmasses. These regions experience very large changes in temperature throughout the year. This means they have warm or hot summers and very cold winters. This extreme change is important for understanding how different parts of the Earth work.

This climate happens because of how air moves and how land interacts with the atmosphere. In the winter, cold air masses move into these regions because the days are shorter. During the summer, warm air masses form because the sun stays up longer. These areas are often far from the ocean. Oceans usually act as a moderator, which means they keep temperatures steady. Without the ocean nearby, the temperature is not moderated. This effect is called continentality. It measures how much a region experiences these big temperature swings.

Precipitation, or rain and snow, follows a specific pattern in these zones. Most of the precipitation is moderate in amount. It usually happens during the warmer summer months. However, there are a few exceptions to this rule. In the mountains of the Pacific Northwest, precipitation is different. Some regions around the Persian Plateau also show a winter maximum for precipitation. In many continental areas, a portion of the rain falls as snow. This snow often stays on the ground for more than one month.

Scientists use different systems to classify these climates. The Köppen climate classification system is very common. In this system, continental climates are identified by the capital letter D. Another system is the Trewartha climate classification. In the Trewartha system, these climates are identified as Dc. These systems help researchers organize the many different types of weather found across the globe.

There are several distinct types of continental climates based on summer heat and rain. The Köppen system divides them into groups like Dfa, Dfb, and Dfc. For example, Dfa is a hot-summer humid continental climate. It has at least one month averaging above 10°C and four months above 10°C. Dfb is a warm-summer version where all months are below 22°C. Dfc is a subarctic climate with only one to three months above 10°C. There is also Dfd, which is an extremely cold subarctic climate.

Some continental climates are influenced by other major weather systems. Monsoon-influenced climates, like Dwa or Dwb, have very different rain patterns. In these areas, the wettest summer month has at least ten times as much rain as the driest winter month. There are also Mediterranean-influenced continental climates, such as Dsa or Dsb. These regions have at least three times as much rain in the winter as in the summer. In these specific types, the driest summer month receives less than 60 mm of rain.

Most continental climates are found in the Northern Hemisphere. This is because there are much larger landmasses in the north. You can find them in central and eastern North America. They also cover much of Eurasia. Specific places include northern and northeastern China and northern Mongolia. Most of Korea and central Afghanistan also have this climate. You can find it in parts of Kazakhstan, Kyrgyzstan, and much of the Russian Federation. In North America, it covers central and southeastern Canada and the northeastern United States.

These climates connect to many other environmental systems. In Europe, they grade off into oceanic climates as you move west. In Asia and the central United States, they transition into humid subtropical or Mediterranean climates. As you move toward the equator, they grade into temperate climates. If precipitation becomes too low, they turn into semi-arid or arid climates. This shows how continental climates sit between the wet oceans and the dry deserts.