WxDecoder

4MT9 Weather Boulanger Field Airport

Darby, MontanaElevation 3,891 ftSmall airport
OFF-FIELD REFERENCE
Nearest report: KMSO · 53 NM N · More than 1 hour old
No ceiling, visibility 10 SM.
No on-field report, so no field flight category. Conditions at the field may differ.
OFF-FIELD REFERENCE · KMSO
WIND
120@16
steady
VISIBILITY
10 SM
16.1 km
CEILING
None
no BKN/OVC layer
FORECAST & PILOT NOTES · SUPPLEMENTAL

Extended forecast and pilot notes

No current METAR is available for this airport, so there is no observed aviation report to summarize. Forecast suggests this afternoon partly sunny, high near 58F, low near 34F, 0% chance of precipitation. Key risks: no significant hazards are highlighted right now, but always confirm against an official briefing.

DayConditionsTemp FWindGustsPrecipPilot note
This Afternoon Partly Sunny 58/34 N 4 kt – 0%
Monday Partly Sunny then Light Rain Likely 60/35 SSE 6 kt – 94%
Tuesday Chance Rain And Snow 48/30 SW 7 kt – 50%
Wednesday Partly Sunny then Chance Light Rain 51/29 S 11 kt – 31%
Thursday Slight Chance Light Snow 51/29 SSE 3 kt – 20%
Friday Chance Rain And Snow 48/28 SSW 3 kt – 35%
Saturday Slight Chance Light Snow then Chance Rain And Snow 50/28 SSW 2 kt – 26%

Source: National Weather Service (office MSO). Forecast issued 2353Z.

Radar

Radar data: NOAA/NWS MRMS composite reflectivity. For situational awareness only, not a substitute for an official weather briefing.

OUR HEADSET PICK · NOT SPONSORED

DC

David Clark DC ONE-X

Not sponsored, just the headset we'd buy ourselves: the DC ONE-X, with hybrid noise canceling, Bluetooth, and 30+ hour battery. And David Clark's A+ customer service is the real reason we recommend them.

Visit David Clark
RUNWAYS & WIND
Crosswind calculator
No runway layout is available for 4MT9. Enter a runway number or heading to estimate wind components.
FIELD CONDITIONS

Field elevation

Field elevation
3,891 ft MSL

Density and pressure altitude need a current temperature and altimeter from the METAR.

DAYLIGHT & NIGHT

Sun & logging windows

Sunset
0033Z 6:33 PM
Sunrise
1408Z 8:08 AM
Loggable night
0104Z (7:04 PM local) → 1337Z (7:37 AM local)
end of evening to start of morning civil twilight
Position lights required
0033Z (6:33 PM local) → 1408Z (8:08 AM local)
sunset to sunrise (91.209)
Night passenger currency
0133Z (7:33 PM local) → 1308Z (7:08 AM local)
1 hr after sunset to 1 hr before sunrise (61.57(b))

FAA definitions, shown in Zulu with airport-local time. Verify for your operation.

AIRPORT INFORMATION

Facility & services

Boulanger Field Airport is in Darby, Montana. Field elevation 3,891 ft MSL. Airport facts are drawn from OurAirports and the FAA NASR dataset.

OPERATIONS & CONTACT
TypeSmall airport
CHARTS & AIRSPACE
ICAO / IATA4MT9
RegionMontana
CountryUnited States
Coordinates46.0303, -114.1850
SERVICES & LIGHTING
Control towerNon-towered
AIRCRAFT ACTIVITY

4MT9 traffic patterns

2026-09-27 to 2026-10-21, 6 days observed · data 2026-10-23

Medium confidence
TRAFFIC VOLUME (30-DAY)
AVG LANDINGS/DAY
1.2
AVG OPS/DAY
2.3
Activity trend over 6 days: flat, from 2 to 2 operations per dayOperations trend (6 days)

Busiest day: Sat · Busiest month: Oct

FLEET MIX
Helicopter 100%

Mostly rotorcraft.

TOP AIRCRAFT TYPES
›UH1 (Helicopter) · ~2 landings/mo
›UNKN (Helicopter) · ~2 landings/mo
›B06 (Helicopter) · ~1 landings/mo
LIKELY BASED AIRCRAFT
Low-confidence estimate

Aircraft likely based near this airport (estimate), mostly rotorcraft.

›UNKN (Helicopter)

This is an estimate based on repeated flight patterns, not registration data. Do not rely on it to identify specific aircraft or owners.

Data limitations (4)
›ADS-B coverage is incomplete; counts are an observed lower bound, not official totals.
›Some aircraft do not transmit usable ADS-B and are not counted.
›Aircraft types and based estimates are inferred and may be wrong.
›This is not official ATC, FAA, or airport data.
NEARBY AIRPORTS

Weather reference stations

4MT9 has no on-field report. Nearest reporting station: KMSO (53 NM N, VFR).

KMSO Missoula Montana Airport
53 NM N
VFR
KSMN Lemhi County Airport
56 NM S
VFR
KBTM Bert Mooney Airport
71 NM E
VFR
KGIC Idaho County Airport
81 NM W
VFR
KDLN Dillon Airport
83 NM SE
IFR
KLLJ Challis Airport
91 NM S
VFR
OFFICIAL LINKS & SOURCES
↗Search NOTAMs (official FAA NOTAM Search)
↗4MT9 on OurAirports
FREQUENTLY ASKED
Does 4MT9 have a METAR?
No on-field METAR is issued for 4MT9. This page uses the nearest reporting station as a reference.
Does 4MT9 have a TAF?
No TAF is issued directly for 4MT9. Use the nearest TAF-issuing field as a planning reference.
What is the field elevation at 4MT9?
4MT9 sits at 3,891 ft MSL, which factors into the density-altitude estimate on this page.
Is this an official preflight weather briefing for 4MT9?
No. wxdecoder.com is for education and situational awareness only. It is not an official weather briefing or a substitute for official sources, NOTAM review, and pilot judgment.
This app is for aviation weather education, training, and situational awareness only. It is not a substitute for an official weather briefing, approved flight-planning software, flight service, dispatch procedures, current FAA regulations, or pilot judgment. Always verify weather with official sources before flight.