Welcome to winter! Blessings descend in it. Its nights are long to pray, and its days are short to fast. - Abdullah Bin Mas’ud [R]
Winter is the best season for the believer because Allah strengthens his practice by making worship easy for him. The believer can easily fast during the day without suffering from hunger and thirst. The days are short and cold, and he doesn’t feel the hardship of fasting.
As for praying at night, due to winter’s long nights, one can have his share of sleep and then wake up to pray. He can recite the Qur’an that he usually does in a day while having enough time to sleep.
So, it becomes possible to fulfil the interests of both – his religion and the comfort of his body.
Source: Lata’if Al-Ma’arif, Page 276, Ibn Rajab Al-Hanbali