Guidance · AIMAIM effective July 9, 2026
AIM 7-1-17 Estimating Intensity of Snow or Drizzle (Based on Visibility)
Chapter 7. Safety of Flight · Section 1. Meteorology
A reference copy of the official AIM text for study. It is not legal advice or an FAA interpretation; always confirm against the current official source.
a. Light. Visibility more than 1 / 2 statute mile.
b. Moderate. Visibility from more than 1 / 4 statute mile to 1 / 2 statute mile.
c. Heavy. Visibility 1 / 4 statute mile or less.
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