St. Thomas, located in the US Virgin Islands, offers year-round snorkeling opportunities in warm Caribbean waters. The island's position along major shipping routes and its volcanic geology create diverse underwater topography, including coral reefs, rocky outcroppings, and sandy channels that support varied marine life. Water temperatures remain consistently warm, typically between 78-84°F, and visibility generally ranges from 60-100 feet depending on seasonal conditions and recent weather patterns.
| Month | Epic Score | Avg Temp | Avg Wind | Wave Ht | Rating |
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| November |
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| December |
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