Groundwater temperature

The map provides an overview of Switzerland's current groundwater temperatures. The calculation is based on percentiles of the dataset for the standard period 1991–2020 or, in the case of a shorter data series, the standard period 2001–2020 (basic data in °C). A figure significantly lower than the average conditions (low groundwater temperature) is reached if the current value is below the long-term 10th percentile, i.e. it is among the lowest 10% of all the data measured for the relevant month in the standard period. A groundwater temperature between the 10th and 90th percentiles means that conditions are normal. However, a figure significantly higher than the long-term average conditions (high groundwater temperature) is reached if the current value is above the 90th percentile.