Mount Washington Observatory
Daylight today(Sep 2, 2026, local time)
About 13h 12m of daylight. Civil twilight (dawn/dusk) approximates the FAA definition of night for logging and currency. Times are computed and approximate — verify with official sources.
About Mount Washington Observatory
The Mount Washington Observatory (MWObs) is a private, non-profit scientific and educational institution organized under the laws of the state of New Hampshire. The weather observation station is located on the summit of Mount Washington in New Hampshire. The first regular meteorological observations on Mount Washington were conducted by the U.S. Signal Service, a precursor of the Weather Bureau, from 1870 to 1892.
Summary from Wikipedia, photo via Wikimedia Commons, licensed under CC BY-SA.
Live weather
KMWNNOTAMs
KMWNReference only — not an official briefing. Always obtain a certified briefing (e.g. 1800wxbrief.com / your AIS) before flight.
NOTAM data via the FAA NOTAM system.
Live departures & arrivals
Flight data by AeroDataBox. Times are estimates — not for navigation; confirm with the airline.
Where you can fly from here
Current scheduled routes & daily frequency by AeroDataBox. Approximate — confirm bookable schedules with the airline.
Live traffic nearby
Aircraft currently within ~40 nm, from live ADS-B. Positions are approximately real-time — not for navigation.
Live ADS-B by adsb.lol & the OpenSky Network. Not for navigation.
Map
Runway centrelines, navaids and overlapping airspace. Tiles © OpenStreetMap contributors. Reference only — not for navigation.
Runways (0)
No runway data recorded for this airport.
Services & operations
From the airport’s official website — details may change, so confirm with the airport. Official site
Airspace in this area(2)
| Name | Class | Type | Floor | Ceiling |
|---|---|---|---|---|
| YANKEE 1 SR-SS & BY NOTAM | Special use | Danger | 9000 ft MSL | FL180 |
| YANKEE 2 SR-SS & BY NOTAM | Special use | Danger | 100 ft GND | 9000 ft MSL |
Approximate bounding-box match from OpenAIP · all United States airspace. Reference only — consult official charts for exact boundaries and status.
Tall obstacles nearby
| Obstacle | Height AGL | Top (MSL) | Lit |
|---|---|---|---|
| Obstacle | 489 ft | 1,673 ft | — |
| Obstacle | 489 ft | 1,578 ft | — |
Tallest obstacles within ~10 nm. Data via OpenAIP. Reference only — consult official charts.
Nearby airports
Great-circle distance and true bearing from Mount Washington Observatory.
Frequently asked questions
What is the ICAO code for Mount Washington Observatory?
The ICAO code for Mount Washington Observatory is KMWN.
Where is Mount Washington Observatory located?
Mount Washington Observatory is heliport located in United States, at an elevation of 6,288 ft (1,917 m).
What time zone is Mount Washington Observatory in?
Mount Washington Observatory is in the America/New York time zone (UTC-04:00).
What is the magnetic variation at Mount Washington Observatory?
The magnetic variation (declination) at Mount Washington Observatory is approximately 14.2° W, per the World Magnetic Model. Variation changes slowly over time — always use the current value charted for navigation.
What airports are near Mount Washington Observatory?
The nearest airport to Mount Washington Observatory is Gorham Airport (2G8), about 8.7 nm to the nne, followed by Twin Mountain Airport and Mount Washington Regional Airport.
Is the information on this page suitable for flight planning?
No. Mount Washington Observatory data here is for reference and training only — not for navigation. Always consult official sources and current charts before any flight.