Astanga Hrudaya
तद्विधस्तद्विधे देहे कालस्यौष्ण्यान्न कुप्यति। अद्भिरम्लविपाकाभिरोषधीभिश्च तादृशम्॥२६॥
But during summer, Vata does not undergo profound increase due to the heat of the summer. (Remember, cold is a quality of vata). Hot is opposite to Vata, hence there is no increase by a large extent.
english translation
tadvidhastadvidhe dehe kAlasyauSNyAnna kupyati। adbhiramlavipAkAbhiroSadhIbhizca tAdRzam॥26॥
hk transliteration by Sanscript