Hellfire sought permission from its Lord and was allowed to exhale twice each year. The intense heat you feel is from the heat of Hellfire, and the intense cold is from its frigid blast.
حدثنا يونس قال حدثنا أبان يعني العطار عن يحيى بن أبي كثير عن محمد بن عبد الرحمن بن ثوبان
أن جهنم استأذنت ربها فنفسها في كل عام مرتين فشدة الحر من حر جهنم وشدة البرد من زمهريرها
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Its chain of transmission is sahih. Bukhari related it 1/142, in the book of prayer times, on delaying Dhuhr due to heat. Muslim related it 1/430, number 615, in the book of mosques, on the recommendation of delaying Dhuhr due to heat. Tirmidhi related it 4/711, number 2592, in the description of Hell, on what has been said about the fire having two breaths. Ibn Majah related it 2/1444, number 4319, in the book of asceticism, on the description of the fire. And Malik related it in Muwatta 1/15, in the book of prayer times, on the prohibition of praying in the intense midday heat.