Hindu Kush Himalaya Snow Cover Hits Lowest Level in Over Two Decades

Snow cover in the Hindu Kush Himalaya has reached its lowest point in over two decades, marking the fourth consecutive year of weak snow levels. Reduced snow storage means less water for rivers, affecting nearly two billion people. Major river basins like the Indus and Mekong are experiencing significant declines.

The amount of time snow stays on the ground across the Hindu Kush Himalaya has dropped sharply this year, touching its lowest level in more than two decades. A new update by the International Centre for Integrated Mountain Development shows snow persistence in 2026 is 27.8% below normal, a trend that could affect water availability for nearly two billion people who depend on rivers flowing from these mountains.

This is not a one-off dip. The region has now recorded below-normal snow levels for four consecutive years, pointing to a steady weakening of winter snow reserves. Scientists say this matters because snow acts like a natural storage system, slowly releasing water during warmer months. When that storage shrinks, rivers may carry less water, especially in early summer when rainfall is still limited.

Many of Asia's major rivers depend on melting snow. Reduced snow cover means weaker flows, which can trigger water stress downstream. The report highlights that 10 out of 12 key river basins in the region have seen lower-than-usual snow persistence this year. The impact stretches across several major systems, including the Indus, Amu Darya and Helmand, where communities rely heavily on snow-fed water for farming, electricity and daily use.

Some areas have seen particularly steep drops. The Mekong basin recorded a fall of nearly 60%, while the Tibetan Plateau dropped by over 47%. Other basins such as the Salween, Yellow River, Amu Darya and Tarim also reported notable declines. Even traditionally snow-dependent basins like the Indus and Helmand saw reductions of around 18%, raising concerns for regions already dealing with water pressure.

Not all areas showed the same pattern. The Irrawaddy basin recorded an increase of 21.8% in snow persistence, while the Ganga basin saw a rise of 16.3%. This uneven pattern suggests that snow behaviour is becoming more unpredictable across the region.

"Meltwater from snow contributes around 23% to the total river runoff in the HKH region on average, with the share of snowmelt increasing from east to west," the ICIMOD report said.

The report adds that the continuing decline is not just a seasonal concern but part of a larger shift. "The sustained decline in snow persistence is a critical signal of changing cryospheric conditions under a warming climate," it said.

Researchers have linked the shrinking snow cover to rising temperatures and changing precipitation patterns. Warmer winters mean less snow accumulation, while erratic weather affects how long snow stays on the ground. With demand for water rising across countries in South and Central Asia, this trend could deepen vulnerabilities — from agriculture and hydropower to drinking water supplies.

ICIMOD has urged governments to act quickly. Suggested steps include better water management, improved seasonal forecasting and stronger cooperation between countries that share Himalayan rivers. The warning is clear: as the mountains lose their ability to store water in the form of snow, the pressure will shift downstream — where millions depend on every drop.