The ideal temperature for watering a Christmas tree is around 70 degrees Fahrenheit. However, if you're using hot water to melt any ice or snow that has accumulated on the tree, make sure to use caution and not to overheat the water, as this could damage the tree's needles and branches. Additionally, keep in mind that some types of Christmas trees, such as pine trees, may require more frequent watering than others, so be sure to check the instructions that came with your tree to ensure it's receiving the right amount of moisture.