Why Does Coastal Maine Get Sudden Dense Fog Banks in Late Spring?
🕐 7 min read | 🌍 Natural Wonders 🔒 Key Takeaways Coastal Maine averages over 60 dense fog days per year, with the highest concentration occurring between May and June. Late spring fog in Maine is primarily advection fog, formed when warm, moist air from the south moves over the still-frigid Gulf of Maine, which hovers near 45°F (7°C) even in May. Visibility during these fog events can drop to near zero — sometimes below 0.25 miles — within minutes, earning Maine the nickname 'the Fog Coast of America.' The Gulf of Maine warms 99% faster than the global ocean average, meaning this fog dynamic is actively changing, with fog frequency shifting unpredictably in recent decades. One moment the rocky shore of Acadia is bathed in warm May sunshine, and the next, a wall of white silence swallows the coastline whole — coastal Maine dense fog banks arrive with almost supernatural speed. What invisible force transforms a clear spring afternoon into a zero-visibility ghost...