Astanga Hrudaya
तुल्येऽपि काले देहे च स्कन्नत्वान्न प्रकुप्यति। इति कालस्वभावोऽयमाहारादिवशात्पुनः॥२८॥
(Remember, hot is the quality of Pitta) Coldness checks further increase of Pitta in rainy season. Kapha undergoes Chaya in winter by the use of foods with cold and oily qualiies. But it does not undergo prakopa because Kapha becomes solidified due to severe cold of the winter So, activities and food habits can cause increase or decrease of Dosha.
english translation
tulye'pi kAle dehe ca skannatvAnna prakupyati। iti kAlasvabhAvo'yamAhArAdivazAtpunaH॥28॥
hk transliteration by Sanscript