Definition
Weather observations taken at ground level at a reporting station, recording conditions such as temperature, dew point, wind, visibility, cloud cover, ceiling, precipitation, and altimeter setting. They are gathered by trained observers, automated stations (ASOS/AWOS), or a combination, and are issued routinely (typically hourly) or as special reports when conditions change significantly.
Plain English
These are weather readings taken right at the ground at a specific airport or station. They tell you what the weather is actually doing there, right now.
Context Anchor
Pilots use surface observations during preflight weather checks, while comparing nearby airport conditions, and when deciding whether conditions are suitable for takeoff, landing, or continuing a flight.
Derivation
‘Surface’ here means at the Earth's surface, as opposed to upper-air observations made aloft by balloon or aircraft. Naming the level of measurement is what makes the term meaningful.
Why Pilots Care
Surface observations are the backbone of preflight planning. They tell you whether the weather at your airport meets your personal and legal minimums for takeoff, approach, and landing.
Intuition Check
Do not read “surface observations” as observations of the runway surface only. In this FAA weather context, it means weather observed at or near the ground at a reporting site.
Example Sentence 1
Before departure, the pilot reviewed the surface observations for both the departure and destination airports.
Example Sentence 2
Hourly surface observations help determine whether VFR conditions exist at the destination airport.