Why calibration matters

Groundwater temperature varies widely by region.

Sonic measurement depends on the speed of sound, which depends on temperature. Indicative groundwater temperatures span from near freezing in northern Canada to around 30 °C in tropical regions — which is why Echo supports per-borehole calibration rather than a single global value.

Cool climates

10 °C

Range 8 – 12 °C

Temperate climates

14 °C

Range 10 – 18 °C

Tropical climates

27 °C

Range 24 – 30 °C

Country	Region	Average	Min	Max
Argentina	All	17 °C	10 °C	24 °C
Argentina	Central Pampas	16 °C	14 °C	18 °C
Argentina	Northern	22 °C	20 °C	24 °C
Argentina	Patagonia	9 °C	6 °C	12 °C
Brazil	All	25 °C	20 °C	30 °C
Brazil	Central / Northern	27 °C	24 °C	30 °C

Indicative groundwater temperature ranges, in degrees Celsius. Provided as context for why per-borehole temperature calibration matters.