On 5 June GeoNet reported that a new heating cycle at Ruapehu?s summit Crater Lake began, as indicated by a recent rise in the water temperature.
The increasing lake temperature began 29 May, at a rate of about 1°C per day.
Volcanic tremor also increased, representing a greater flow of hydrothermal fluids into the lake.
Many heating and cooling cycles have occurred in the past; the current cycle does not indicate an unusual sign of unrest.
The Volcanic Alert Level remained at 1 (minor volcanic unrest) and the Aviation Color Code remained at Green.