Climate of Asia
No other continent encompasses as many climate zones as Asia. From tropical rainforest along the equator to the coldest inhabited village on Earth in Siberia, from dry deserts in Arabia and the Gobi to the most powerful monsoon rains in the world in Bangladesh — Asia displays the full spectrum of climate on a single landmass.
The Köppen-Geiger climate classification
Climatologists use the Köppen-Geiger classification to map climate zones based on temperature and precipitation. The system divides the world into five main climates (A through E) with further subdivisions. Asia is the only continent where all five main climates occur — a direct consequence of the enormous extent of nearly 44.6 million km² and its span from the Arctic to beyond the equator.
The position of the major mountain ranges — the Himalayas, the Karakoram, the Hindu Kush, the Tian Shan — plays a decisive role. These ranges block moist air from the Indian Ocean, creating a sharp climate boundary: on the southern side of the Himalayas more than 2,000 mm of rain falls annually, while on the northern side on the Tibetan Plateau sometimes less than 150 mm falls. The Himalayas thus function as a gigantic climate divide, comparable to the role of the Alps in Europe — a comparison you can find on the comparison page.
Overview of Köppen climate zones in Asia
| Köppen zone | Where in Asia | Characteristics |
|---|---|---|
| A — Tropical (Af, Am, Aw) | Indonesia, Malaysia, Philippines, Sri Lanka, southern India, Mekong delta | Year-round ≥ 18 °C, no cold month; high rainfall throughout the year or seasonal |
| B — Dry (BWh, BWk, BSh, BSk) | Arabian Peninsula, Iran, Pakistan (Balochistan), Gobi Desert, Kazakh steppe | Precipitation less than evaporation; desert (BW) or steppe (BS); hot or cold subtype |
| C — Temperate (Cfa, Cfb, Csa, Csb, Cwa) | Eastern China (Yangtze valley), Japan (except Hokkaido), South Korea, coastal Turkey, Georgia | No permanent frost; four seasons; warmest month above 10 °C |
| D — Continental/subarctic (Dfa, Dfb, Dfc, Dfd) | Siberia (Russia), Mongolia, Manchuria (northern China), Hokkaido (Japan), northern Kazakhstan | Harsh winters (coldest month < −3 °C); warm to cool summers; large temperature range |
| E — Polar and alpine (ET, EF) | Siberian arctic coastline, highest parts of the Tibetan Plateau, Himalayan glaciers | Warmest month below 10 °C (ET) or below 0 °C (EF); permanent ice or tundra |
Source: Köppen-Geiger climate classification, updated map Beck et al. 2023.
The South Asian monsoon
The monsoon is the most defining weather phenomenon of Asia and affects the lives of more than 2 billion people. The mechanism is simple but powerful: in summer the Asian continent heats up faster than the Indian Ocean. The pressure gradient draws moist oceanic air onto the landmass, which rises above the Ghats and the Himalayan foothills and releases its moisture as rain.
The southwest monsoon typically reaches the coast of Kerala (India) around 1 June and then gradually moves north and west. At its peak in July–August it delivers the bulk of the annual rainfall for India, Bangladesh, Nepal and Myanmar. Cherrapunji in the Indian state of Meghalaya, with an average of 11,430 mm of rain per year, is one of the wettest places on Earth. Without the monsoon the Gangetic Plain could not be the food producer of South Asia.
The monsoon also has a winter variant: the northeast monsoon brings dry air from the Siberian high-pressure zone between October and December and brings rain to the southeast coast of India and Sri Lanka. Extreme monsoon behaviour — drought from a weak monsoon or flooding from a powerful one — is strongly linked to the El Niño–Southern Oscillation (ENSO), which is also discussed on the equator and hemispheres page.
Extremes: the coldest and hottest places
Asia holds several climate records. The village of Oymyakon in the Russian republic of Yakutia recorded a temperature of −67.7 °C on 26 January 1926 — the lowest ever measured temperature for a permanently inhabited place on Earth. Oymyakon lies in a valley where cold air sinks and accumulates at night (a cold sink). The average January temperature is around −50 °C. The village today has fewer than 500 inhabitants.
At the other end of the spectrum lie the deserts of the Arabian Peninsula and the Lut Desert in Iran. The Lut (Dasht-e Lut) recorded a surface temperature of 70.7 °C via MODIS satellite in 2005 — the highest ever measured on the Earth's surface. Air temperatures in the shade regularly exceed 50 °C here. The combination of no cloud cover, dry air and dark rock makes the Lut one of the hottest places on Earth.
The Gobi Desert in Mongolia and northern China is a cold desert climate (BWk): hot summers (up to +40 °C), icy winters (down to −40 °C), and less than 200 mm of rainfall per year. The Gobi is slowly expanding through overgrazing and climate change — a process called desertification that also affects the climate of northern China.
Seasons and climate change
Due to the enormous spread in latitude, Asia has no uniform seasonal pattern. On the equator (Indonesia, Malaysia, Singapore) temperatures remain stable year-round at around 26–30 °C with no pronounced winter. In the temperate zones of eastern China and Japan the four seasons are clearly distinct: the sakura (cherry blossom) in Japan in March–April marks spring; the typhoon season runs from May to October along the Pacific coasts.
In continental Siberia winter dominates: Yakutsk has a mean annual temperature of −9 °C. Summer is short but sometimes surprisingly warm; temperatures of +30 °C in July are not unusual given the long daylight hours at that latitude.
Climate change is intensifying extremes across Asia. Heatwaves in India and Pakistan increasingly reach temperatures above 50 °C early in the year. Glaciers in the Himalayas are demonstrably shrinking, threatening the long-term freshwater supply of rivers such as the Indus and the Brahmaputra. Rising sea levels pose an existential risk to low-lying delta states like Bangladesh and island nations such as the Maldives. For an overview of the countries affected, see countries of Asia. How Asian time zones relate to geographical position is covered on the time zones page.
Sources
- Köppen-Geiger climate classification — Beck, H.E. et al. (2023), updated world map
- WMO (World Meteorological Organization) — climate records and extremes
- NASA MODIS/Terra — surface temperature measurements Lut Desert 2005
- IPCC AR6 (2021) — climate projections for Asia (chapters 10 and 12)