When to Fly and When Not to Fly

The go/no-go decision is the most important judgment call a pilot makes. Weather is the leading factor in general aviation accidents, and knowing when to stay on the ground is a skill that takes years — and discipline — to develop.

Setting Personal Minimums

FAA minimums are the legal floor, not a recommendation for comfort. As a VFR pilot, 3 statute miles visibility and clear of clouds is the legal minimum in Class G, but that doesn't mean you should fly in those conditions.

A good starting framework for newer VFR pilots:

  • Visibility: 5+ statute miles
  • Ceiling: 3,000+ feet AGL
  • Wind: 15 knots or less, gusts under 20
  • Crosswind component: Within half your demonstrated maximum

As you gain experience, you can gradually lower these — but never below your honest comfort level.

Red Flags in Weather Briefings

These should trigger serious hesitation:

  • Thunderstorms (TS) anywhere near your route — Convective activity is unpredictable and deadly. Give cells at least 20 nautical miles of clearance.
  • Icing conditions — Unless you're flying a certified FIKI aircraft, visible moisture below freezing is a hard no.
  • Low IFR (LIFR) conditions — Ceilings below 500 feet or visibility below 1 mile. Even IFR-rated pilots should think carefully.
  • Mountain obscuration — MTOS means you cannot see the terrain. Don't try to scud-run through valleys.
  • Rapidly changing pressure — A fast-dropping altimeter setting often means a frontal passage with turbulence and wind shifts.

The "Get-There-Itis" Trap

The most dangerous weather isn't severe — it's marginal. When conditions are borderline, pressure to complete a flight (dinner reservations, work meetings, returning a rental) clouds judgment. Always ask: "If I weren't expected somewhere, would I still go?"

Good Days to Fly

The flip side — some weather patterns are a joy:

  • High pressure systems — Clear skies, light winds, smooth air
  • Morning calm — Early flights often have the smoothest conditions before thermals develop
  • Post-frontal clearing — The day after a cold front passes usually brings excellent visibility

The 3-Step Decision Process

  1. Get a full briefing — Don't just check the app. Call 1-800-WX-BRIEF or use a proper briefing service.
  2. Set your criteria beforehand — Decide your minimums before looking at the weather so you're not rationalizing.
  3. Give yourself an out — Always have a plan B. What's your alternate airport? What if conditions deteriorate en route?

The best pilots are the ones who occasionally cancel flights. That's not weakness — it's judgment.