Reference data analysis
What the year comparison shows for Lake Walen
Typical low point
418.47 m a.s.l.
January 8
Typical high point
419.68 m a.s.l.
May 31
Typical range
122 cm
Difference between daily medians
In the 1991-2020 reference period, Lake Walen's seasonal median is lowest on January 8 at 418.47 m a.s.l. and highest on May 31 at 419.68 m a.s.l.. The difference between these typical points is 122 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 418.20 m a.s.l., which is 75 cm below that calendar day's median of 418.94 m a.s.l.. Compared with the same calendar day in 2025, the value is 45 cm lower.
Within the 1991-2020 reference period, the envelope reaches its highest value of 422.15 m a.s.l. on May 23 and its lowest value of 418.13 m a.s.l. on January 4. These are extremes of the displayed reference period, not all-time records.
The analysis uses the water-level series from Murg. 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.