Monthly weather and climate data for Chaltwasser glacier per hydrological year
The graph below shows the monthly meteorological and climate data for a hydrological year, measured at one of the MeteoSwiss monitoring stations near the Chaltwasser glacier.
Deviations of the annual values from the climate standard values 1991-2020
Measuring station: Simplon-Dorf (1467m), Hydrological year 2025 / 2026
The definitive measured values and deviations for the hydrological year 2025 / 2026 are displayed from 1. October 2026.
| Physical quantity | Annual value | Standard value | Deviation | Unit |
| Precipitation | 182 | 1278 | -1096 | mm |
Source of the basic data: MeteoSwiss
Deviations of the monthly precipitation values from the climate norms 1991-2020
Measuring station: Simplon-Dorf (1467m), Hydrological year 2025 / 2026
The definitive deviations for this January 2026 will be displayed from 1 February 2026.
| month | Monthly value
mm | Standard value
mm | Deviation
mm |
% | Data
% |
| October 2025 | 68.1 | 149.6 | -81.5 | -54.5 | 98.0 |
| November 2025 | 44.7 | 167.5 | -122.8 | -73.3 | 99.9 |
| December 2025 | 47.8 | 83.7 | -35.9 | -42.9 | 99.1 |
| January 2026 | 21.8 | 38.4 | -16.6 | -43.2 | 98.1 |
| Hydrological year | 182.4 | 439.2 | -256.8 | -58.5 | 98.9 |
| Winter half-year | 182.4 | 439.2 | -256.8 | -58.5 | 98.9 |
Source of the basic data: MeteoSwiss
The more the values for «Data» deviate from 100%, the more cautiously the monthly values and deviations should be interpreted.
Unusual weather, climate and natural events
The following unusual weather, climate and natural events occurred during the hydrological year 2025 / 2026:
| Date | Title, description |
12.11.2025-
14.11.2025 | Zero degree line well above 3000 metres
Die Nullgradgrenze steigt in der Schweiz auf deutlich über 3000m ü.M. |
14.11.2025-
15.11.2025 | Sahara dust (medium intensity)
Saharastaub-Ereignis mit mittlerer Intensität. |
| 21.11.2025 | Snow falls down to the lowlands
Im Winter 2025/2026 fällt erstmals Schnee bis ins Flachland. |
Measuring station: Distance and compass direction
The measuring station Simplon-Dorf (1467m) is located at a distance of approximately 6km from Chaltwasser glacier in the direction of SSW.
Snow depths
The table below lists the snow depth measuring stations located in the vicinity of the Chaltwasser glacier. Extensive information on the development of the snow depth for various periods can be called up for each measuring station. All links lead to the website www.whiterisk.ch, which is operated by the Institute for Snow and Avalanche Research SLF.
| Snow depth measuring station | Height
m a.s.l | Distance
km | Direction | Link |
| Bortelsee | 2517 | 5 | NNE | Snow depths |
| Ze Seewe, Simplon | 2620 | 3 | SE | Snow depths |
| Simplon Hospiz | 2000 | 4 | WSW | Snow depths |
Legend
- Distance: Approximate distance from the Chaltwasser glacier to the snow depth measuring station.
- Direction: Seen from the Chaltwasser glacier, the snow depth measuring station is in this direction.
Availability of data
We have been storing the meteor data since 1. December 2023.
Further information
Further information on the measurement data and the graphics can be found
here... (External link to www.obeng.ch, the website of Oberli Engineering GmbH)
Further links
All links point to pages on our website www.obeng.ch.