Skip to content
Know before you taxi

All Products

Aviation Intelligence

Alerts & Airspace

Free Pilot Tools & Widgets

RC Aviation

Games & Learning

Weather Research & More

Pilot Resources

My Airports

Your shortcuts, saved on this device. Search to add an airport.

No airports saved yet. Add the fields you visit most.

Ask ATIS

Muhlenberg County Airport (KM21) Aviation Weather: METAR

As of 4:35 PM CDT, Oct 27, KM21 is currently VFR with calm winds, visibility 10+ statute miles, and no ceiling reported.

Live aviation weather for Muhlenberg County Airport in Greenville, KY, including METAR, flight category, wind, visibility, ceiling, altimeter and runway crosswinds.

Muhlenberg County Airport (KM21) is a general aviation airport serving pilots in and around Greenville, KY at a field elevation of 428 ft. KM21 reports its own METAR, decoded live on this page as flight category, wind, visibility, ceiling and altimeter. It has one runway (06/24), the longest 4,999 ft. Automated weather is broadcast on 120.375.

Ask ATIS AIAsk anything about KM21's weather, runways or delays, or search another airport.
VFR
Observed 2135Z (4:35 PM CDT)live · refreshes every 60s
Wind
Calm
Visibility
10+ sm
Ceiling
Unlimited
Altimeter
30.21"
Temp / Dew
74°F / 23°C
dew 47°F / 9°C

Wind calm, visibility 10+ statute miles, no cloud data, temperature 23°C (74°F), altimeter 30.21 inHg. Conditions are Visual Flight Rules (VFR).

Raw METAR
METAR KM21 272135Z AUTO 00000KT 10SM CLR 23/09 A3021 RMK AO2 T02330086

What changed at KM21?

Since the 2115Z (4:15 PM CDT) report, compared automatically against the latest METAR.

No significant changes since the 2115Z (4:15 PM CDT) report, conditions are holding steady.

Current pilot readout for KM21

KM21 is currently VFR with calm winds, visibility 10+ statute miles, and no ceiling reported. Density altitude is approximately 1,150 ft (field elevation 428 ft). KM21 does not publish a TAF. The nearest TAF station is KOWB, about 31 nm away.

New to aviation weather? How to read a METAR → · What VFR/MVFR/IFR mean → · Decode any METAR/TAF → · Density altitude calculator →

Runway wind check

Estimated head/tailwind and crosswind for each runway end from the current reported wind.

Current wind is calm: calm wind is not a factor for runway selection, and with no wind there is no head/tail or crosswind component to compute. Live numbers return automatically once a report includes a wind direction.

RunwayHead / TailCrosswind
06--
24--

Open the crosswind calculator to try your own wind and runway numbers →

KM21 runways

1 physical runway · 2 runway ends. Each card opens the runway's intelligence page: equipment and lighting, LAHSO, frequencies, today's configuration, predicted use, history and approaches.

  • Runway 06/24
    4,999 × 75 ft · ASP
    Restricted (NOTAM)
    Current use
    no stated-runway source at KM21
    Wind
    06
    no steady wind
    24
    no steady wind
    1 active equipment NOTAMView Runway Intelligence →

“Current use” is what the facilitystates; wind components are arithmetic on the current METAR against TRUE headings; status reflects NOTAMs received through SWIM, the tower's TFDM record and the D-ATIS — a runway reads “Open” only with a complete NOTAM picture.

24-hour trend

Wind, ceiling and flight category over the last 24 hours.

Wind (kt)Gusts (kt)Bottom strip, flight category:VFRMVFRIFRLIFRNo report
061221Z09Z21Z

Over the last 24 h: wind 0→0 kt, ceiling unlimited → unlimited.

KM21 weather radar

Live NEXRAD + lightning, with a 4-hour future-radar forecast. Drag to pan, tap ⚡ to toggle lightning.

Loading…
Loading radar…

Radar: NOAA/NWS via IEM · Forecast: NOAA HRRR · Lightning: NOAA · Map © Stadia Maps © OpenMapTiles © OpenStreetMap

NOAA NEXRAD composite and lightning, updated about every five minutes; amber frames are HRRR model guidance, not observed radar. Not for navigation.

Pilot reports (PIREPs) within 100 NM of KM21

Reported by pilots in flight over the past 6 hours, via aviationweather.gov.

PIREP2024Z (3:24 PM CDT) · 88 NM NE of KM21 · 20,000 ft MSL · C30J
Show raw report
SDF UA /OV SDF/TM 2024/FL200/TP C30J/SK BASE 240/TA M15/TB NEG/IC NEG
SDF UAHeader: reporting station and UA: a routine pilot report.
OV SDFLocation: fix or navaid, optionally with a radial and distance in NM.
TM 2024Reported at 20:24 UTC.
FL200Altitude: 20,000 ft MSL.
TP C30JAircraft type reporting.
SK BASE 240Sky condition: cloud bases and tops in hundreds of feet MSL.
TA M15Outside air temperature, °C.
TB NEGTurbulence: none reported.
IC NEGIcing: none reported.
PIREP1619Z (11:19 AM CDT) · 89 NM SE of KM21 · during descent · B738
Show raw report
KMBT UA /OV KMBT /TM 1619 /FL120 /TP B738 /RM DURGD DURD SMOOTH RIDE EIDS-BNA
KMBT UAHeader: reporting station and UA: a routine pilot report.
OV KMBTLocation: fix or navaid, optionally with a radial and distance in NM.
TM 1619Reported at 16:19 UTC.
FL120Altitude: 12,000 ft MSL.
TP B738Aircraft type reporting.
RM DURGD DURD SMOOTH RIDE EI…Remarks.
PIREP1614Z (11:14 AM CDT) · 89 NM SE of KM21 · during descent · B738
Show raw report
KMBT UA /OV MBT /TM 1614 /FL120 /TP B738 /RM DURGD DURD SMOOTH RIDE EIDS-BNA
KMBT UAHeader: reporting station and UA: a routine pilot report.
OV MBTLocation: fix or navaid, optionally with a radial and distance in NM.
TM 1614Reported at 16:14 UTC.
FL120Altitude: 12,000 ft MSL.
TP B738Aircraft type reporting.
RM DURGD DURD SMOOTH RIDE EI…Remarks.

⚠️ PIREPs are unverified pilot reports. Not for operational use: conditions change between reports.

Recent aviation weather trends at KM21

From ATIS Alerts' hourly weather history.

Over the past 24 hours, KM21 reported mostly VFR across 69 observations, with 6 flight-category changes. Wind most often came from the E.

Last 24 hours
VFR 96%MVFR 4%
Wind avg/max: 0/6 kt
Max gust: -
Lowest ceiling: -
Lowest vis: -
Prevailing wind: E
Category changes: 6

Most recent change: MVFR → VFR

Last 7 days
VFR 100%
Wind avg/max: 1/8 kt
Max gust: -
Lowest ceiling: -
Lowest vis: 7 sm
Prevailing wind: N
Category changes: 0
Wind-favored runway - past 30 days

Share of hours each runway had the most headwind. From wind reports, not ATC assignments.

24
56%
06
44%

Get KM21 weather alerts in Telegram

Stop refreshing aviation weather manually. Track KM21 in ATIS Alerts and get notified when a new METAR changes the picture: a category drop, or wind and ceiling moving toward your minimums.

Track KM21 free on Telegram

Live KM21 Weather

Live crosswind meter

Measured by KM21's own weather station.

N0624wind calm / variable

Wind is calm or variable. Either end works.

Asphalt · 4,999 ft. Headings from FAA runway data. Not for navigation.

Field aerial

North up

Aerial photo of Muhlenberg County Airport (KM21) with runway 06/24 marked
N ↑

Runway 06/24 drawn from FAA threshold coordinates.

Imagery: USGS The National Map (public domain). Something off? ✏️ Suggest an edit

Airport info

From the FAA airport record (cycle 2026-10-01) and OurAirports.

Services

Fuel
100LL · Jet A+
Attended
Mon-Fri 0800-1700 local
Repairs
Airframe & engine, major
Transient parking
Tie-downs · Hangars
Landing fee
No
Other services
Air ambulance
Control tower
None
Wind indicator
Unlighted

Airport

Type
General aviation airport
ICAO
KM21
FAA LID
M21
City
Greenville
State
Kentucky
Country
United States
Elevation
428 ft
Coordinates
37.2260, -87.1570
Runways
1 physical runway · 2 runway ends
Longest runway
4,999 ft
Weather reporting
Reports METAR
TAF
Nearest KOWB
AWOS/ASOS
120.375 MHz
Time zone
America/Chicago
Sunset in
1h 13m

Run a flight school, FBO, or club here? Embed KM21's live status on your website, free →

Nearby airports

Compare nearby METAR/TAF stations within 25, 50 and 100 NM before departure or arrival.

VFRMVFRIFRLIFRNo report

RC flying fields nearby

AMA model-aircraft club fields around this airport: live wind, crosswind & flyability on each page.

All RC flying fields →

See all Kentucky airports →

Customize your M21 shirt or mug

M21's real runway layout on the back, elevation and tower frequency on the front. Add your tail number on the sleeve.

Shop M21 merch

Pilot PIREPs for Muhlenberg County Airport (KM21)

Community-submitted

Community-submitted airport notes from pilots about runway conditions, wildlife, FBOs, fuel, turbulence, ramp access, and local tips.

Read recent community-submitted pilot notes for Muhlenberg County Airport, including runway conditions, wildlife activity, FBO/fuel notes, turbulence, ramp access, and local airport tips.

⚠️ Pilot PIREPs on ATIS Alerts are community-submitted airport notes for situational awareness only. They are not official FAA PIREPs, NOTAMs, weather briefings, airport advisories, or flight-planning guidance. Always verify with official FAA/NWS sources, airport management, ATC, and current publications.

No Pilot PIREPs have been submitted for KM21 yet. Recently flew here? Help the next pilot by leaving a quick airport note.

Pilot PIREPs are community pilot notes for situational awareness only, not official FAA PIREPs or advisories. Verify with official sources. Notes are moderated before they appear; helpful marks and reports help us keep them useful.

⚠️ Not for operational use. Always verify with official FAA-approved preflight weather sources before flight.

No D-ATIS at this airport, showing METAR.

Spotted incorrect airport info? ✏️ Suggest an edit

How ATIS Alerts works · All US airports · Kentucky airports