runwayinuse

C66 Monmouth Muni

21
WIND_INFERRED 90%

Runway 21 — favored by the wind (6 kt at 200° true)

Based on wind only — no traffic or ATIS to confirm. No D-ATIS feed here — a voice ATIS/AWOS may exist; check the frequency. No ADS-B traffic data available.

certainty: 90% evidence: NONE no tower now

N 21 3

Wind 200° true at 6 kt · VFR · 69 min old · from KGBG (9.0 nm away)

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21 92% 2899 ft · 6 kt head, 0 kt x-left
3 8% 2899 ft · 6 kt TAIL, 0 kt x-right
Why — evidence behind this answer

Runway 21

Runway 3

Sources consulted

sourcestatus agenote
D_ATISUNAVAILABLE No D-ATIS at this field
METAROK 69 min Nearest station KGBG (9.0 nm away)
ADSBUNAVAILABLE No ADS-B track history here yet
NOTAMOK
CIFPNOT_CONFIGURED Instrument procedures: phase 4

Recent operations

No operations observed in the last hour. (No ADS-B track history here yet)

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C66 field & runways

Monmouth Muni, Monmouth, Illinois. Field elevation 753 ft. Non-towered (NON-ATCT). Magnetic variation 3.0°E on record, 1.9°W today.

The FAA's variation of record is the number this field was surveyed against; the second is where north points now, from WMM2025. It is moving 0.047°/year west — about 1° every 21 years — which is why runway numbers eventually stop matching their pavement.

Runway data from the FAA NASR 01 Oct 2026 cycle. Where NASR locates both thresholds, the true heading is the bearing between them rather than NASR's whole-degree alignment. Magnetic is that heading against today's declination from WMM2025, not the field's variation of record — so it can differ from the chart by the gap between the two shown above. The number painted on the runway is the one ATC uses.
RunwayTrueMagnetic Number LengthSurfacePattern Notes
21 203.3° 205.2° matches 2,899 ft ASPH left
3 23.3° 25.2° matches 2,899 ft ASPH left

Generated 09:43:35Z · auto-refreshes · JSON