Manual measuring network

The SLF avalanche warning service operates an extensive network of manual measuring sites. The sites are distributed throughout the Swiss Alps and predominantly situated in intermediate altitude zones, between 1000 and 2000 m. Some of the measurement series already span very long periods and are therefore highly valued; the data are also used for climatological and hydrological purposes.

The measuring sites are in fixed locations, which are flat and wind-protected. The observers who perform the measurements are trained and paid by the SLF. Data is collected, as far as possible, from the beginning of November until the end of April and after that until half of the measuring site is snow-free. On some measuring sites event-based measurements are also collected during the summer months. If possible, measurements take place between 7 and 7.30 am local time.

The following variables are measured at all measuring sites:

• snow depth and 24-hour new snow

at numerous sites this additional variable is measured:

• water equivalent of 24-hour new snow (height of the water column in millimeters, if the new snow sample is melted, without changing the base area)

When using the data, please consider and adhere to the associated Terms of Use

To download live data use our API.

To download data older than 7 days use our File Download.

• WSL Institute for Snow and Avalanche Research SLF (link)