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The Weather of 2026
Observations at Vellmar, with the level of the Ostra, fog on the river and the state of Lake Tarn at Tarnmund, as recorded by The Tarnmund Observatory, observing since 1869. Temperatures in degrees, rainfall in millimetres.
The months
| Month | Mean | Warmest day | Coldest night | Rain | Fog days | Frost days | Remarks |
|---|---|---|---|---|---|---|---|
| January | -3.3° | 9° | -14° | 25 mm | 8 | 31 | |
| February | -2.0° | 8° | -11° | 26 mm | 7 | 30 | |
| March | 2.4° | 11° | -6° | 35 mm | 6 | 4 | |
| April | 7.7° | 21° | -3° | 44 mm | 5 | 0 | |
| May | 13.0° | 24° | 4° | 64 mm | 0 | 0 | |
| June | 16.3° | 26° | 8° | 82 mm | 0 | 0 | |
| July | 18.6° | 28° | 8° | 96 mm | 1 | 0 | |
| August | 18.4° | 30° | 8° | 91 mm | 3 | 0 | |
| September | 14.7° | 26° | 7° | 78 mm | 6 | 0 | |
| October | 10.0° | 20° | -2° | 84 mm | 11 | 0 | |
| November | 5.4° | 14° | -5° | 34 mm | 8 | 0 | |
| December | 2.2° | 14° | -6° | 37 mm | 8 | 5 |
Lake Tarn
The lake froze at Tarnmund on 15 January 2026, as the towns reported and bore the weight of a man by the end of the month; the ferry to the eastern shore was replaced by a marked path. The thaw is recorded on 10 February 2026.
The Ostra
The river rose to 1.9 metres above its mark at Vellmar bridge at the highest. 63 days of fog were recorded on the lower river, the ferries stopping when the far bank could not be seen.
The Observatory's note
The Tarnmund Observatory certifies the foregoing as the record of 2026, compiled from the Vellmar station, the lakeside station at Tarnmund and the garrison readings at Marschau. Readings on the Osmoor beyond the Reed Line are not taken. The Observatory notes that the front-line report received each evening from the War Ministry makes no mention of the weather at the front, and that none is expected.
Warmest month, 18.6°; coldest, -3.3°. Means are of the month; the warmest day and coldest night are the extremes recorded.
Weather in the public record
- 3 February 2026, Lindenmar. The Ostra rises 20 centimetres above its mark at Lindenmar. Cellars in Orchard Lane are flooded. Report.
- 3 March 2026, Weinwick. The Ostra rises 30 centimetres above its mark at Weinwick. Cellars in Salt Street are flooded. Report.
- 16 March 2026, Hollstadt. A storm strips roofs in Hollstadt and fells the old lime in Lime Row. Report.
- 19 March 2026, Dammsee. A storm strips roofs in Dammsee and fells the old lime in Church Lane. Report.
- 20 April 2026, Lindenmar. A storm strips roofs in Lindenmar and fells the old lime in Well Street. Report.
- 23 May 2026, Reedtal. The Ostra rises 40 centimetres above its mark at Reedtal. Cellars in Short Row are flooded. Report.
- 19 June 2026, Kessel. A storm strips roofs in Kessel and fells the old lime in Garrison Square. Report.
- 28 June 2026, Weinfeld. The coldest night in 70 years is recorded at Weinfeld. Lake Tarn freezes to the middle. Report.
- 2 July 2026, Tarnmoor. The coldest night in 30 years is recorded at Tarnmoor. Lake Tarn freezes to the middle. Report.
- 7 July 2026, Sandfeld. A storm strips roofs in Sandfeld and fells the old lime in Ferry Quay. Report.
- 9 July 2026, Tarnmoor. The Ostra rises 40 centimetres above its mark at Tarnmoor. Cellars in Lime Lane are flooded. Report.
- 16 July 2026, Brennholt. A storm strips roofs in Brennholt and fells the old lime in Bridge Row. Report.
- 20 July 2026, Tarnmund. The Ostra rises 80 centimetres above its mark at Tarnmund. Cellars in Warden Square are flooded. Report.
- 11 August 2026, Hagenkirchen. The coldest night in 20 years is recorded at Hagenkirchen. Lake Tarn freezes to the middle. Report.
- 24 August 2026, Marschau. The Ostra rises 40 centimetres above its mark at Marschau. Cellars in Cooper Walk are flooded. Report.
- 18 September 2026, Berging. A storm strips roofs in Berging and fells the old lime in Market Walk. Report.