Extreme cold makes it permissible to perform Tayammum

Q: What should people do if it is so cold that water freezes in pots etc., when they are in a state of major or minor ritual impurity, and water affects them badly and may cause them to contract a fever?

(Part No. 5; Page No. 346)  A: All praise be to Allah Alone, and peace and blessings be upon His Messenger, and his family and Companions. People in such circumstances are permitted to perform Tayammum (dry ablution with clean earth), for Allah (Exalted be He) says (what means): But if you are ill or on a journey, or any of you comes after answering the call of nature, or you have been in contact with women (i.e. sexual intercourse), and you find no water, then perform Tayammum with clean earth and rub therewith your faces and hands. But in case that they are able to heat water, it is obligatory for them to use it to remove their state of major or minor ritual impurity. Allah (Glorified and Exalted be He) says: So keep your duty to Allâh and fear Him as much as you can May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.