China Ties Its Hottest Year on Record in 2025 as Rainfall Records Fall Across the Country

China’s climate in 2025 delivered a combination of warmth and moisture so pronounced that several long-standing national records were either matched or decisively broken, according to the latest annual assessment compiled by the country’s National Climate Center and published as the peer-reviewed report “State of China’s climate in 2025” in the journal Atmospheric and Oceanic Science Letters. The report, now in its eighth consecutive year of publication since the series began in 2019, synthesizes nationwide observations of surface air temperature, precipitation, high-impact weather events and associated disaster losses into a single authoritative account of the year’s climate behavior. Its central finding is unambiguous: 2025 was one of the warmest and wettest years in China’s instrumental record, with the national annual-mean temperature tying 2024 as the highest ever observed, and annual precipitation running above climatological normal across much of the country.

The spatial structure of the 2025 anomalies was as noteworthy as their magnitude. Rather than a uniform wetting, the year displayed a striking north-south contrast across central and eastern China, with conditions skewed toward a wetter north and a drier south. This dipole pattern matters enormously for water resource management, agriculture and flood defense, because it concentrates hydrological stress in different regions at different times. In the north, above-normal rainfall swollen by record-breaking seasonal rain episodes filled reservoirs and saturated soils, while parts of the south faced periods of deficit that required careful allocation of irrigation supplies. Climate scientists note that such reversed or amplified precipitation gradients are consistent with the kind of circulation disruptions expected as the East Asian summer monsoon responds to a warming background climate, though attribution of any single year’s pattern requires careful analysis beyond the scope of the annual summary.

Temperature statistics for the year were dominated by the persistence of heat rather than a single spectacular spike. The annual count of high-temperature days, a metric that tracks how often stations exceeded defined heat thresholds, climbed to a new historical maximum, underscoring that 2025 was not merely warm on average but repeatedly hot in ways that stress human health, power grids and crop development. Central and eastern China endured the fourth-strongest large-scale heatwave since systematic records began in 1961, an event distinguished by its spatial footprint and intensity. Compounding the summer burden, autumn brought so-called “autumn tiger” episodes, a colloquial Chinese term for unseasonably hot spells that arrive after the nominal end of summer and extend the season of heat stress well into what should be a cooling period. The combination of an exceptional summer heatwave and lingering autumn warmth pushed cumulative heat exposure metrics to levels without precedent in the observational archive.

The precipitation side of the ledger was equally remarkable, with multiple seasonal benchmarks falling in the same year. The rainfall amount and duration of the North China rainy season both set new records, a doubly significant outcome because the length of the rainy season governs how long soils remain saturated and how sustained flood risk persists across the densely populated North China Plain. Separately, the West China autumn rain phenomenon, a characteristic autumnal rainfall regime over the country’s western interior, also reached record intensity, and national autumn precipitation as a whole established a new high. For three distinct seasonal precipitation measures to break records simultaneously is unusual and points to a persistently anomalous circulation configuration during the second half of the year, with moisture transport pathways repeatedly directed toward regions where they produced prolonged, heavy and impactful rainfall.

The consequences of this wet, energetic year were felt most acutely during the summer, when exceptionally severe rainstorm processes struck North China, Northeast China and Inner Mongolia. These episodes broke daily and cumulative rainfall records at numerous individual stations, overwhelming urban drainage systems and rural flood defenses alike, and ultimately triggered regional major flooding across the Haihe River Basin, one of China’s principal river systems that drains the Beijing-Tianjin-Hebei heartland. The Haihe Basin has a long and well-documented history of catastrophic floods, and modern water infrastructure was engineered with historical maxima in mind; rainfall events that rewrite those maxima test the assumptions embedded in decades of hydraulic planning. Long-lasting and intense West China autumn rain added a second wave of agricultural disruption, interfering with autumn harvesting operations and delaying winter-wheat sowing, the planting window on which the following year’s wheat harvest depends. Farmers in affected areas faced the difficult choice between harvesting waterlogged fields and risking grain quality losses.

Tropical cyclone activity also ran above normal on both sides of the life-cycle ledger, with the number of storms forming in the western North Pacific and the number making landfall on the Chinese coast both exceeding their climatological averages. Autumn typhoons successively impacted South China, and several systems struck during national holiday periods, when travel surges, crowded tourist destinations and family gatherings dramatically increase the population exposed to coastal and inland hazards. The report highlights that these holiday-timed landfalls carried elevated disaster risk, because evacuation logistics, transportation capacity and emergency communications are all strained when hazards coincide with peak seasonal migration. The concurrence of an active typhoon season with the record autumn rainfall regime illustrates how multiple hazard streams can overlap within a single season, compounding rather than merely adding to regional impacts.

Not every region and season told the same story, and the report is careful to document the counterpoints to the dominant warm-wet narrative. Meteorological drought, defined by sustained precipitation deficits and elevated evaporative demand, displayed prominent regional and sub-seasonal variations, appearing and receding across different areas on timescales short enough to complicate drought monitoring and response. Cold-wave outbreaks occurred more frequently than the long-term norm, a reminder that a warming climate does not eliminate severe winter intrusions and that mid-latitude circulation variability can still deliver sharp, damaging cold snaps. Severe convective weather, including the short-lived but violent storms that produce damaging winds, hail and tornadoes, was active nationwide, and the national total of gale days reached its highest level since 1991. Spring sand-dust events over northern China were also more frequent than the long-term average, linking the year’s weather to the condition of arid and semi-arid source regions upwind.

One of the most consequential findings of the assessment concerns the bottom line of disaster economics. Despite the sheer frequency of extreme weather and climate events through 2025, the overall losses attributed to meteorological disasters came in below the 2015-2024 decadal average. The authors of the report do not interpret this as evidence that the hazards were mild; rather, the outcome reflects the cumulative effect of China’s sustained investment in early warning systems, forecast skill, disaster preparedness, infrastructure hardening and coordinated emergency response, which together reduce the vulnerability that converts a hazardous event into a catastrophic loss. The distinction between hazard frequency and disaster impact is a central theme of modern climate risk science, and 2025 offered a vivid national-scale demonstration that improved forecasting and preparedness can bend the loss curve even as the hazard curve rises.

Taken together, the 2025 assessment contributes to a growing body of evidence that China’s climate is shifting toward conditions in which record warmth, intense precipitation and compound seasonal extremes are no longer rare curiosities but recurring features of the national climate. The annual report series itself, now spanning eight consecutive years in a peer-reviewed international journal, provides a consistent methodological framework that allows year-to-year comparison and long-term trend detection, a resource that climate researchers, water managers, agricultural planners and policy makers increasingly rely upon. As the global mean temperature continues its upward trajectory, the report’s documentation of tied temperature records, simultaneous seasonal precipitation records and a rising count of heat days offers a granular, regionally detailed picture of what a warming world looks like in practice for one of the most populous and economically significant nations on Earth. The full findings are available in Atmospheric and Oceanic Science Letters, published by the Institute of Atmospheric Physics at the Chinese Academy of Sciences.

Subject of Research: The state of China's climate in 2025, including record warmth, precipitation extremes and high-impact weather events.

Article Title: China's 2025 climate: Distinct warm‑wet conditions and multiple new climate records

Article References: China's 2025 climate: Distinct warm‑wet conditions and multiple new climate records. (n.d.). Original publication

Image Credits: AI Generated

DOI: Not provided

Keywords: China climate 2025, record temperature, precipitation records, Haihe River Basin floods, heatwave, typhoons, autumn rain, drought, cold waves, National Climate Center, Atmospheric and Oceanic Science Letters, climate monitoring