Snipe, I can try to weight it down. What other type thermometer is everyone using?
$3 pool thermometer from Walmart (the floating type) tied to some good cord with a large nut to make it sink. I also tied a small Gatorade bottle to the cord about 12 feet from the thermometer (my pond is 10 foot deep). This keeps the cord off the bottom to avoid snags and would make for retrieval if I accidentally let go of the cord when throwing it out.