Brihat Samhita
पौषे समार्गशीर्षे सन्ध्यारागो अम्बुदाः सपरिवेषाः । नात्यर्थं मृगशीर्षे शीतं पौषे अतिहिमपातः ॥ २१-१९ ॥
In the month of Pauṣa, and also in Mārgaśīrṣa, the twilight is tinged with red, and clouds appear with halos around them. In Mṛgaśīrṣa the cold is not excessive, but in Pauṣa there is a heavy fall of frost and snow.
english translation
pauSe samArgazIrSe sandhyArAgo ambudAH sapariveSAH । nAtyarthaM mRgazIrSe zItaM pauSe atihimapAtaH ॥ 21-19 ॥
hk transliteration by Sanscript