General rules (Class C, D, E below 10,000 MSL): - 3 Statute Miles visibility - 1000 feet above clouds - 500 feet below clouds - 2000 feet horizontal from clouds Exceptions include Class B (3 SM, Clear of Clouds) and Class G Day below 1200 AGL (1 SM, Clear of Clouds). Search for "airspace visibility cloud clearance table" for the visual aid - super helpful