He was planning to return on February 5 after spending four days at Darwin Glacier.
However, Dittmer said the weather around New Zealand's highest mountain was "really bad".
"There was heavy rain, and the conditions are medium-level cloud with rain and high winds."
The 30-year-old climber set off the beacon after experiencing a "rough night" and becoming mildly hypothermic. He has since made his way to Tasman Saddle Hut and contacted the search team via radio.
The search team was able to get to him and concluded his health was okay. The climber said he will make his own way back, and may continue on his journey.