Choose the sentence with the correct use of a preposition: In Islamabad, it often snows at January., In Islamabad, it often snows in January., In Islamabad, it often snows on January., In Islamabad, it often snows of January.

Choose the sentence with the correct use of a preposition: In Islamabad, it often snows at January., In Islamabad, it often snows in January., In Islamabad, it often snows on January., In Islamabad, it often snows of January.

Explanation

The preposition "in" is used for months, years, and long periods.

Therefore, "in January" is the correct usage.