WxDecoder

US-4765 Weather Las Arenas Earth and Sky Observatory Airport

Alamosa, ColoradoElevation 7,582 ftSmall airport
OFF-FIELD REFERENCE
Nearest report: KALS · 11 NM W · More than 1 hour old
Ceiling 9,000 ft, visibility 10 SM.
No on-field report, so no field flight category. Conditions at the field may differ.
OFF-FIELD REFERENCE · KALS
WIND
180@6
steady
VISIBILITY
10 SM
16.1 km
CEILING
9,000 ft
lowest BKN/OVC
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 from 200° at 13 kt, visibility 9 SM, temperature 6C. Treat this as supplemental, not an aviation observation. Forecast suggests tonight showers and thunderstorms, low near 31F, 78% chance of precipitation. Key risks: thunderstorms in the forecast; strong winds in the forecast.

PILOT WEATHER NOTES
Thunderstorms in the forecastWeather.gov
Tonight: Showers And Thunderstorms. Watch for developing convection and plan alternates.
Strong winds in the forecastWeather.gov
Sunday: winds up to 30 kt. Re-check crosswind components closer to departure.
DayConditionsTemp FWindGustsPrecipPilot note
Tonight Showers And Thunderstorms 31 SE 9 kt – 78% Thunderstorms in the forecast
Monday Mostly Sunny 52/27 SSW 4 kt – 1%
Tuesday Sunny 57/27 SSW 13 kt – 0%
Wednesday Sunny 59/28 SSW 13 kt – 0%
Thursday Mostly Sunny 58/32 S 9 kt – 13%
Friday Partly Sunny then Chance Rain Showers 57/32 S 9 kt – 29%
Saturday Slight Chance Rain Showers then Mostly Sunny 54/30 SW 13 kt – 15%
Sunday Rain Showers Likely 52 S 17 kt 30 kt 67% Strong winds in the forecast

Source: National Weather Service (office PUB). Forecast issued 0155Z.

Radar

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

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RUNWAYS & WIND
Crosswind calculator
No runway layout is available for US-4765. Enter a runway number or heading to estimate wind components.
RUNWAYS

Runway detail & declared distances

1 runway · longest 2,700 ft

02/20
Dimensions
2,700 x 40 ft
Surface
Dirt (fair)
RWY 02
RWY 20

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
7,582 ft MSL

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

DAYLIGHT & NIGHT

Sun & logging windows

Sunset
0012Z 6:12 PM
Sunrise
1321Z 7:21 AM
Loggable night
0039Z (6:39 PM local) → 1254Z (6:54 AM local)
end of evening to start of morning civil twilight
Position lights required
0012Z (6:12 PM local) → 1321Z (7:21 AM local)
sunset to sunrise (91.209)
Night passenger currency
0112Z (7:12 PM local) → 1221Z (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

Las Arenas Earth and Sky Observatory Airport is in Alamosa, Colorado. Field elevation 7,582 ft MSL. Airport facts are drawn from OurAirports and the FAA NASR dataset.

OPERATIONS & CONTACT
OwnershipPrivately owned
UsePrivate use
TypeSmall airport
ManagerJAMES LILLY
Manager phone719-298-1183
AttendedUNATNDD
CHARTS & AIRSPACE
ICAO / IATAUS-4765
SectionalDENVER
Center (ARTCC)DENVER
Flight service (AFSS)DENVER
RegionColorado
CountryUnited States
Coordinates37.4787, -105.6325
Distance from city13 NM W
SERVICES & LIGHTING
Control towerNon-towered
AIRCRAFT ACTIVITY

Traffic patterns

Aircraft activity data is not available for this airport yet.

NEARBY AIRPORTS

Weather reference stations

US-4765 has no on-field report. Nearest reporting station: KALS (11 NM W, VFR).

KALS San Luis Valley Regional Airport/Bergman Field
11 NM W
VFR
KTAD Perry Stokes Airport
63 NM E
VFR
KAXX Angel Fire Airport
66 NM S
MVFR
KANK Salida Airport - Harriet Alexander Field
67 NM N
VFR
KPSO Stevens Field
69 NM W
VFR
KRTN Raton Municipal Airport / Crews Field
70 NM SE
MVFR
AIRPORT REMARKS

Operational remarks

›FOR CD CTC DENVER ARTCC AT 303-651-4257.
OFFICIAL LINKS & SOURCES
↗Search NOTAMs (official FAA NOTAM Search)
↗US-4765 on OurAirports
FREQUENTLY ASKED
Does US-4765 have a METAR?
No on-field METAR is issued for US-4765. This page uses the nearest reporting station as a reference.
Does US-4765 have a TAF?
No TAF is issued directly for US-4765. Use the nearest TAF-issuing field as a planning reference.
What is the field elevation at US-4765?
US-4765 sits at 7,582 ft MSL, which factors into the density-altitude estimate on this page.
Is this an official preflight weather briefing for US-4765?
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.