Anandakanda 1.19.54

1.19.54

grīṣme prāvṛṣi śītaṃ syātsarveṣāṃ prāṇināṃ balam /
<hemantartucaryā>
rasasya balinaḥ śītasaṃvṛtatvāddhimāgame //

and weak in summer and the early rainy season for all living beings.
<Regimen for the early winter season>
Because the bodily fluid is strong and enclosed by cold at the onset of winter,