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

Mertens Airport (3CO2) Area Aviation Weather & Runway Winds

As of 3:55 AM MDT, Oct 28, based on the nearest station (KSTK), 3CO2 is currently LIFR with calm winds, visibility 1/4 statute mile, and a 100 ft ceiling.

Aviation weather near Mertens Airport in Sterling, CO, decoded from the nearest reporting station (KSTK): conditions and runway crosswinds.

Mertens Airport (3CO2) is a general aviation airport serving pilots in and around Sterling, CO at a field elevation of 4,192 ft. 3CO2 has no weather station of its own. Conditions here are decoded from KSTK, about 3 nm away, the nearest reporting station, and local conditions can differ. It has one runway (18/36), the longest 4,000 ft. The nearest TAF is issued for KSNY.

Ask ATIS AIAsk anything about 3CO2's weather, runways or delays, or search another airport.
LIFR
Observed 0955Z (3:55 AM MDT)live · refreshes every 60s

No weather station at this airport: showing the nearest station KSTK, 3.1 nm away.

Wind
Calm
Visibility
0.25 sm
Ceiling
100 ft
Altimeter
29.91"
Temp / Dew
41°F / 5°C
dew 41°F / 5°C

Wind calm, visibility 1/4 statute mile, overcast at 100 ft, temperature 5°C (41°F), altimeter 29.91 inHg. Conditions are Low IFR (LIFR), ceiling 100 ft.

Raw METAR
METAR KSTK 280955Z AUTO 00000KT M1/4SM FG OVC001 05/05 A2991 RMK AO2

What changed at KSTK (nearest station)?

Since the 0935Z (3:35 AM MDT) report, compared automatically against the latest METAR.

  • Fog began (FG).
  • Rain ended (-RA).

Current pilot readout for 3CO2

Based on the nearest station (KSTK), 3CO2 is currently LIFR with calm winds, visibility 1/4 statute mile, and a 100 ft ceiling. Density altitude is approximately 4,000 ft (field elevation 4,192 ft). 3CO2 does not publish a TAF. The nearest TAF station is KSNY, about 33 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
18--
36--

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

3CO2 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 18/36
    4,000 × 100 ft · GRVL-DIRT
    Status not monitored
    Current use
    no stated-runway source at 3CO2
    Wind
    18
    no steady wind
    36
    no steady wind
    no active equipment NOTAM receivedView 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
061210Z22Z09Z

Over the last 24 h: wind 0→0 kt, ceiling unlimited → 100 ft.

3CO2 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 3CO2

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

PIREP0920Z (3:20 AM MDT) · 78 NM SW of 3CO2 · 8,000 ft MSL · B763
Show raw report
DEN UA /OV DEN/TM 0920/FL80/TP B763/TB NEG
DEN UAHeader: reporting station and UA: a routine pilot report.
OV DENLocation: fix or navaid, optionally with a radial and distance in NM.
TM 0920Reported at 09:20 UTC.
FL80Altitude: hundreds of feet MSL. UNKN = unknown; DURC/DURD = during climb/descent.
TP B763Aircraft type reporting.
TB NEGTurbulence: none reported.
PIREP0537Z (11:37 PM MDT) · 78 NM SW of 3CO2 · 13,000 ft MSL · A21N
int light tb 13,000–11,000 ft turbulence
Show raw report
DEN UA /OV DEN/TM 0537/FL130/TP A21N/TB INT LGT TB 130-110
DEN UAHeader: reporting station and UA: a routine pilot report.
OV DENLocation: fix or navaid, optionally with a radial and distance in NM.
TM 0537Reported at 05:37 UTC.
FL130Altitude: 13,000 ft MSL.
TP A21NAircraft type reporting.
TB INT LGT TB 130-110Turbulence: int light tb 13,000–11,000 ft.
PIREP0420Z (10:20 PM MDT) · 78 NM SW of 3CO2 · during descent · B737
smooth turbulence
Show raw report
DEN UA /OV OV DEN /TM 0420/FLDURD/TP B737/TB SMOOTH
DEN UAHeader: reporting station and UA: a routine pilot report.
OV OV DENLocation: fix or navaid, optionally with a radial and distance in NM.
TM 0420Reported at 04:20 UTC.
FLDURDReported during descent.
TP B737Aircraft type reporting.
TB SMOOTHTurbulence: smooth.

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

Recent aviation weather trends at 3CO2

From ATIS Alerts' hourly weather history.

Over the past 24 hours, the nearest station KSTK reported a mix of conditions, most often VFR across 72 observations, with 12 flight-category changes. The lowest ceiling was 100 ft. Wind most often came from the S.

Last 24 hours
VFR 50%MVFR 8%IFR 11%LIFR 31%
Wind avg/max: 3/8 kt
Max gust: -
Lowest ceiling: 100 ft
Lowest vis: -
Prevailing wind: S
Category changes: 12

Most recent change: MVFR → LIFR

Last 7 days
VFR 66%MVFR 16%IFR 8%LIFR 10%
Wind avg/max: 5/20 kt
Max gust: 26 kt
Lowest ceiling: 100 ft
Lowest vis: 0.25 sm
Prevailing wind: S
Category changes: 24

Most recent change: IFR → LIFR

Wind-favored runway - past 30 days

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

18
52%
36
48%

Get 3CO2 weather alerts in Telegram

Stop refreshing aviation weather manually. Track 3CO2 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 3CO2 free on Telegram

No live weather from 3CO2

Live crosswind meter

3CO2 has no weather feed online, so the wind comes from KSTK, 3.1 nm away.

N1836wind calm / variable

Wind is calm or variable. Either end works.

Have a weather station at 3CO2? Help us make your field's weather available to every pilot, free. Add your field's wx station →

Gravel · 4,000 ft. Headings from FAA runway data. Not for navigation.

Field aerial

North up

Aerial photo of Mertens Airport (3CO2)
N ↑

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
Daily 0700-1600 local
Repairs
Airframe & engine, minor
Landing fee
No
Control tower
None
Wind indicator
Unlighted

Airport

Type
General aviation airport
FAA LID
3CO2
City
Sterling
State
Colorado
Country
United States
Elevation
4,192 ft
Coordinates
40.6164, -103.3324
Runways
1 physical runway · 2 runway ends
Longest runway
4,000 ft
Weather reporting
Nearest station KSTK
TAF
Nearest KSNY
Time zone
America/Denver
Next sunset
13h 45m

Run a flight school, FBO, or club here? Embed 3CO2'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 Colorado airports →

Pilot PIREPs for Mertens Airport (3CO2)

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 Mertens 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 3CO2 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.

Spotted incorrect airport info? ✏️ Suggest an edit

How ATIS Alerts works · All US airports · Colorado airports