It is narrated from Sayyiduna Abu Sa'id (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: Winter is the spring for the believer.
Hadith Referenceالفتح الربانی / كتاب خلق العالم / 10255
Hadith Gradingمحدثین:ضعیف
Hadith Takhrij«اسناده ضعيف لضعف ابن لھيعة، ولضعف دراج في روايته عن ابي الھيثم، أخرجه ابويعلي: 1386، والبيھقي: 4/ 297 ، (انظر مسند أحمد ترقيم الرسالة: 11716 ترقیم بيت الأفكار الدولية: 11739»
Brief Explanation
Benefits: … ‘Amir bin Mas‘ud radi Allahu anhu narrates that the Messenger of Allah sallallahu alayhi wa sallam said: “Fasting in winter is the cold booty.” … The fasts of winter are a free gain. (Ibn Abi Shaybah: 2/181, Bayhaqi: 4/496, Sahihah: 1922) The meaning of the hadith is clear: the days are short and there is no concept of thirst, so in such circumstances, a Muslim should gather this booty.