WxDecoder

27LL Weather Ralph Jacobs Airport

Valmeyer, IllinoisElevation 400 ftSmall airport
OFF-FIELD REFERENCE
Nearest report: KCPS · 14 NM NE · 53 min old
No ceiling, visibility 10 SM.
No on-field report, so no field flight category. Conditions at the field may differ.
OFF-FIELD REFERENCE · KCPS
WIND
Calm
no steady wind
VISIBILITY
10 SM
16.1 km
CEILING
None
no BKN/OVC layer
FORECAST & PILOT NOTES · SUPPLEMENTAL

Extended forecast and pilot notes

No aviation METAR is published for this airport. The nearest National Weather Service station reports wind calm, visibility 10 SM. Treat this as supplemental, not an aviation observation. Forecast suggests tonight mostly cloudy, low near 51F, 1% chance of precipitation. Key risks: no significant hazards are highlighted right now, but always confirm against an official briefing.

DayConditionsTemp FWindGustsPrecipPilot note
Tonight Mostly Cloudy 51 S 1 kt – 1%
Monday Partly Sunny 78/49 S 4 kt – 2%
Tuesday Mostly Cloudy 77/50 S 5 kt – 0%
Wednesday Sunny 80/53 S 6 kt – 0%
Thursday Sunny 84/54 S 6 kt – 2%
Friday Mostly Sunny 82/57 S 6 kt – 14%
Saturday Chance Rain Showers 76/58 S 6 kt – 72%
Sunday Chance Rain Showers 77 SW 6 kt – 26%

Source: National Weather Service (office LSX). Forecast issued 0246Z.

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 27LL. Enter a runway number or heading to estimate wind components.
RUNWAYS

Runway detail & declared distances

1 runway · longest 2,350 ft

09/27
Dimensions
1,800 x 80 ft
Surface
Turf
RWY 09
RWY 27

Runway data from the FAA NASR dataset (effective 2026-06-11). Verify with the current Chart Supplement and NOTAMs.

FIELD CONDITIONS

Field elevation

Field elevation
400 ft MSL

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

DAYLIGHT & NIGHT

Sun & logging windows

Sunset
2310Z 6:10 PM
Sunrise
1221Z 7:21 AM
Loggable night
2337Z (6:37 PM local) → 1154Z (6:54 AM local)
end of evening to start of morning civil twilight
Position lights required
2310Z (6:10 PM local) → 1221Z (7:21 AM local)
sunset to sunrise (91.209)
Night passenger currency
0010Z (7:10 PM local) → 1121Z (6:21 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

Ralph Jacobs Airport is in Valmeyer, Illinois. Field elevation 400 ft MSL. Airport facts are drawn from OurAirports and the FAA NASR dataset.

OPERATIONS & CONTACT
OwnershipPrivately owned
UsePrivate use
TypeSmall airport
ManagerSTEVE HAYES
Manager phone314-565-2727
AttendedDaily, DALGT
CHARTS & AIRSPACE
ICAO / IATA27LL
SectionalST LOUIS
Center (ARTCC)KANSAS CITY
Flight service (AFSS)COLUMBIA
RegionIllinois
CountryUnited States
Coordinates38.3751, -90.3193
Distance from city4 NM N
SERVICES & LIGHTING
Control towerNon-towered
AIRCRAFT ACTIVITY

27LL traffic patterns

2026-06-12 to 2026-10-22, 18 days observed · data 2026-10-23

Medium confidence
TRAFFIC VOLUME (30-DAY)
AVG LANDINGS/DAY
1
AVG OPS/DAY
1.8
Activity trend over 6 days: flat, from 2 to 2 operations per dayOperations trend (6 days)

Busiest day: Sat · Busiest month: Jul

FLEET MIX
Unknown 56%Piston single 36%Helicopter 8%

Fleet composition unclear from available data.

TOP AIRCRAFT TYPES
›UNKN (Unknown) · ~3 landings/mo
›DV20 (Unknown) · ~2 landings/mo
›P28A (Piston single) · ~1 landings/mo
›BL8 (Unknown) · ~1 landings/mo
›C172 (Piston single) · ~1 landings/mo
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

27LL has no on-field report. Nearest reporting station: KCPS (14 NM NE, VFR).

KCPS St Louis Downtown Airport
14 NM NE
VFR
KSTL St. Louis Lambert International Airport
23 NM N
VFR
KSUS Spirit of St Louis Airport
23 NM NW
VFR
KBLV Scott AFB/Midamerica Airport
25 NM NE
VFR
KSAR Sparta Community Airport - Hunter Field
32 NM SE
VFR
KALN St Louis Regional Airport
33 NM N
VFR
AIRPORT REMARKS

Operational remarks

›FOR CD CTC ST LOUIS APCH AT 314-890-1018.
›SULLIVANFIELD27LL@GMAIL.COM
OFFICIAL LINKS & SOURCES
↗Search NOTAMs (official FAA NOTAM Search)
↗27LL on OurAirports
FREQUENTLY ASKED
Does 27LL have a METAR?
No on-field METAR is issued for 27LL. This page uses the nearest reporting station as a reference.
Does 27LL have a TAF?
No TAF is issued directly for 27LL. Use the nearest TAF-issuing field as a planning reference.
What is the field elevation at 27LL?
27LL sits at 400 ft MSL, which factors into the density-altitude estimate on this page.
Is this an official preflight weather briefing for 27LL?
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.