Italy in 2026: Alpine snow deficit shadows the Po, Lake Garda fills up
Italy enters 2026 with a 58 % Alpine snow-water-equivalent deficit looming over the Po basin and Lake Garda back near 78 %. Here is what the data shows — and why the country's water story splits sharply between north and south.
The single most-watched number in Italian water management is the Alpine snowpack at the end of winter, because it determines how much water the Po basin — the country's industrial and agricultural heartland — will have through the dry summer months. The 2025–2026 picture is mixed: a record-poor early winter, then a strong pre-Christmas snowfall recovery, with reservoir levels still uneven across the peninsula.
Alpine snow: a partial recovery, not a fix
CIMA Research Foundation, which produces the most-used Alpine snow-water-equivalent (SWE) tracking in Italy, reported the Alps at 58 % below the ten-year median through mid-winter 2025–2026 [1]. The pre-Christmas snowfalls then narrowed the Po basin's SWE deficit to roughly –19 %, which is materially within the range of normal interannual variability for the first time in three years [1].
The Alps still entered late winter below their long-term baseline, which is the more important number for summer planning. Each centimetre of missing SWE translates into delayed and lower spring melt, and from there into earlier reservoir drawdown across the Po and its tributaries.
Reservoirs and lakes: the Garda paradox
Lake Garda, the largest Italian lake by surface area, reached 77.9 % of its operational capacity in early 2026 [1], a striking contrast with its mid-2022 low when it sat under 30 %. The recovery reflects both the winter snowfall pattern and the management trade-offs ENEL and irrigation consortia run to balance hydropower, agricultural withdrawal and ecological flow downstream of the Mincio.
Around it, the picture is asymmetric. Northern Italy's reservoirs are within or above the seasonal normal band on most metrics; the centre — Tuscany, Lazio, Marche — sits closer to the mean; and the south and islands (Sicily and Sardinia in particular) remain below long-term averages, with Sicilia continuing to declare regional water emergencies on individual basins through 2026 [2].
Why the Po basin keeps showing up
The Po basin drains about a quarter of Italy by area and carries an outsized share of the country's agricultural output — rice, dairy, maize — plus heavy industrial water demand. The 2022 Po drought, the most severe in two centuries on multiple paleo-records, set a new planning baseline [3]. Even in a recovered year, the basin operates closer to its withdrawal-versus-recharge ceiling than it did in the 1990s.
Two structural shifts compound the climate signal. First, Alpine glaciers — which historically buffered late-summer flow — are receding rapidly: the Stelvio and Marmolada have lost decades of mass since the 1990s. Second, irrigated land area has grown, particularly for high-margin crops, increasing the basin's late-summer demand precisely when supply softens.
Policy moves and signals to watch in 2026
Italy's national drought emergency plan, updated in 2024, formalises an inter-regional water-transfer mechanism between the Po Authority and southern basins under prolonged drought. Activation thresholds and procedures are being tested at table-top level in early 2026, and any actual activation would be the first since the framework's creation.
Forward-looking, three signals matter most: end-of-March Alpine SWE (CIMA bulletins), the Po Authority's monthly hydrological balance, and the European Drought Observatory's combined SPEI indicator. The summer drawdown rate on Lake Garda is the most-watched single proxy — when its weekly decline rate exceeds the 2022 trajectory, the rest of the basin tends to follow within four to six weeks.