WxDecoder

20WI Weather Harju Airport

Redgranite, WisconsinElevation 800 ftSmall airport
OFF-FIELD REFERENCE
Nearest report: KOSH · 23 NM E · 54 min old
Ceiling 12,000 ft, visibility 10 SM.
No on-field report, so no field flight category. Conditions at the field may differ.
OFF-FIELD REFERENCE · KOSH
WIND
010@12
steady
VISIBILITY
10 SM
16.1 km
CEILING
12,000 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 350° at 9 kt, visibility 10 SM, temperature 14C. Treat this as supplemental, not an aviation observation. Forecast suggests tonight mostly cloudy, low near 46F, 11% chance of precipitation. Key risks: thunderstorms in the forecast.

PILOT WEATHER NOTES
Thunderstorms in the forecastWeather.gov
Thursday: Showers And Thunderstorms Likely. Watch for developing convection and plan alternates.
DayConditionsTemp FWindGustsPrecipPilot note
Tonight Mostly Cloudy 46 NNE 4 kt – 11%
Monday Mostly Cloudy 55/42 NE 8 kt – 10%
Tuesday Partly Sunny 65/51 ESE 9 kt – 11%
Wednesday Slight Chance Rain Showers 72/53 SSW 10 kt – 68%
Thursday Showers And Thunderstorms Likely 69/46 WSW 5 kt – 68% Thunderstorms in the forecast
Friday Chance Rain Showers 67/50 ESE 5 kt – 54%
Saturday Chance Rain Showers 66/50 SSE 7 kt – 54%
Sunday Chance Rain Showers 64 WSW 6 kt – 35%

Source: National Weather Service (office GRB). Forecast issued 0147Z.

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 20WI. Enter a runway number or heading to estimate wind components.
RUNWAYS

Runway detail & declared distances

1 runway · longest 1,800 ft

NW/SE
Dimensions
1,800 x 40 ft
Surface
Turf
RWY NW
RWY SE

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
800 ft MSL

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

DAYLIGHT & NIGHT

Sun & logging windows

Sunset
2256Z 5:56 PM
Sunrise
1224Z 7:24 AM
Loggable night
2326Z (6:26 PM local) → 1155Z (6:55 AM local)
end of evening to start of morning civil twilight
Position lights required
2256Z (5:56 PM local) → 1224Z (7:24 AM local)
sunset to sunrise (91.209)
Night passenger currency
2356Z (6:56 PM local) → 1124Z (6:24 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

Harju Airport is in Redgranite, Wisconsin. Field elevation 800 ft MSL. Airport facts are drawn from OurAirports and the FAA NASR dataset.

OPERATIONS & CONTACT
OwnershipPrivately owned
UsePrivate use
TypeSmall airport
ManagerONNI R. HARJU
Manager phone414-566-4638
AttendedUNATNDD
CHARTS & AIRSPACE
ICAO / IATA20WI
SectionalGREEN BAY
Center (ARTCC)CHICAGO
Flight service (AFSS)GREEN BAY
RegionWisconsin
CountryUnited States
Coordinates44.0214, -89.0793
Distance from city1 NM SE
SERVICES & LIGHTING
Control towerNon-towered
AIRCRAFT ACTIVITY

20WI traffic patterns

2026-07-14 to 2026-07-14, 1 days observed · data 2026-10-23

Insufficient confidence
TRAFFIC VOLUME (30-DAY)
AVG LANDINGS/DAY
1
AVG OPS/DAY
1
Operations trend (1 days)

Busiest day: Tue · Busiest month: Jul

FLEET MIX
Unknown 100%

Fleet composition unclear from available data.

TOP AIRCRAFT TYPES
›UNKN (Unknown) · ~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

20WI has no on-field report. Nearest reporting station: KOSH (23 NM E, VFR).

KOSH Wittman Regional Airport
23 NM E
VFR
KATW Appleton International Airport
28 NM NE
VFR
KFLD Fond du Lac County Airport
30 NM SE
VFR
KSTE Stevens Point Municipal Airport
37 NM NW
VFR
KISW Alexander Field South Wood County Airport
39 NM NW
VFR
KCLI Clintonville Municipal Airport
39 NM NE
MVFR
AIRPORT REMARKS

Operational remarks

›OWNER DESIRES ARPT NOT BE CHARTED.
›PROVIDED ALL AERONAUTICAL OPERATIONS ARE CONDUCTED IN ACCORDANCE WITH LETTER OF AGREEMENT BETWEEN HARJU AND BUZZARD'S ROOST AIRPORTS.
›FOR CD CTC CHICAGO ARTCC AT 630-906-8921.
OFFICIAL LINKS & SOURCES
↗Search NOTAMs (official FAA NOTAM Search)
↗20WI on OurAirports
FREQUENTLY ASKED
Does 20WI have a METAR?
No on-field METAR is issued for 20WI. This page uses the nearest reporting station as a reference.
Does 20WI have a TAF?
No TAF is issued directly for 20WI. Use the nearest TAF-issuing field as a planning reference.
What is the field elevation at 20WI?
20WI sits at 800 ft MSL, which factors into the density-altitude estimate on this page.
Is this an official preflight weather briefing for 20WI?
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.