Reference data analysis
What the year comparison shows for Lake Lucerne
Typical low point
433.41 m a.s.l.
March 31
Typical high point
433.78 m a.s.l.
June 20
Typical range
37 cm
Difference between daily medians
In the 1991-2020 reference period, Lake Lucerne's seasonal median is lowest on March 31 at 433.41 m a.s.l. and highest on June 20 at 433.78 m a.s.l.. The difference between these typical points is 37 cm. This describes the average seasonal cycle, not the largest individual fluctuation.
The 2026 curve currently contains 265 calendar days. On September 22 it shows 433.40 m a.s.l., which is 17 cm below that calendar day's median of 433.57 m a.s.l.. Compared with the same calendar day in 2025, the value is 16 cm lower.
Within the 1991-2020 reference period, the envelope reaches its highest value of 435.23 m a.s.l. on August 24 and its lowest value of 433.19 m a.s.l. on March 3. These are extremes of the displayed reference period, not all-time records.
The analysis uses the water-level series from Luzern. Matching calendar days are compared, and the median is the middle value of the reference years. This classification does not replace flood warnings or local safety information.