Wa `alaykum As-Salamu wa Rahmatullahi wa Barakatuh
In the Name of Allah, the All-Merciful, the Mercy-Giving
All praise is due to Allah. Peace and blessings be upon His Messenger Muhammad.
Observing five daily prayers is an obligatory duty of every Muslim. The fact you are living in a cold country is not an excuse to neglect it.
You should know that there are millions of Muslims living in cold countries and they continue to establish prayer.
However, if you find yourself in a situation where you cannot pray outside in the extreme cold and being outside, you can make the intention of combing two prayers by praying them together: you can pray Zhuhr and Asr at the time of either Zhuhr or Asr. But you should not delay them until Maghrib. Likewise, if you are in the same situation, you can also combine Maghrib and Isha. You may offer them at the time of Maghrib or Isha one after the other.
At no time, you should skip the prayer altogether.
Almighty Allah knows best.
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