The Roman History · Amm. 22.15.5

Some natural philosophers affirm that in the districts beneath the North Pole, when the severe winters bind up everything, the vast masses of snow congeal; and afterwards, melted by the warmth of the summer, they make the clouds heavy with liquid moisture, which, being driven to the south by the Etesian winds, and dissolved into rain by the heat of the sun, furnish abundant increase to the Nile.

Ammianus Marcellinus · translated by C. D. Yonge · 1911 reprint
C. D. Yonge translation (preface dated February 1862); G. Bell and Sons, 1911; Project Gutenberg #28587
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