United States · elevation 312 ft AMSL
· 38.9445, -77.4558
Washington Dulles International Airport is an airport with the ICAO code KIAD and the IATA code IAD. Country: United States. Nearest settlement listed in the database: Washington. OurAirports classifies it as a large airport. Its ICAO code starts with the KI prefix, which marks airports in United States. The four-letter code KIAD is used in flight operations and weather reports, while the three-letter IATA code IAD is used for ticketing and baggage handling. The airport reference point sits at 38°56'40"N, 77°27'21"W, at an elevation of 312 ft (95 m) above sea level. The applicable time zone is America/New_York.
Aerial imagery showing the runway and apron layout - the zoom is matched to the longest runway.
| Threshold | Course | Length | Width | Surface |
|---|---|---|---|---|
| 01C | 10° | 3,505 m (11,500 ft) | 46 m (150 ft) | asphalt |
| 19C | 190° | |||
| 01L | 10° | 2,865 m (9,400 ft) | 46 m (150 ft) | asphalt |
| 19R | 190° | |||
| 01R | 10° | 3,505 m (11,500 ft) | 46 m (150 ft) | asphalt |
| 19L | 190° | |||
| 12 | 120° | 3,201 m (10,501 ft) | 46 m (150 ft) | asphalt |
| 30 | 300° |
The course is derived from the runway designator (number × 10), not from a survey - the actual magnetic bearing can differ by a few degrees.
Declared distances (TORA, TODA, ASDA, LDA) are published in the national AIP - they are not part of this table.
What the METAR reports from KIAD for 2023-2025 show - counted hour by hour.
We computed these statistics from 26,270 METAR reports issued by KIAD in 2023-2025. VFR conditions prevailed 85% of the time, MVFR 8% and IFR or LIFR 7%. Best month for VFR flying: November (92% of hours VFR). Most IFR and LIFR hours: December (11%).
Through the day, IFR or LIFR conditions are most frequent around 11:00 UTC (10% of reports at that hour) and least frequent around 01:00 UTC (4%).
Fog (FG) was reported on 10 days a year on average, most often in December. Thunderstorms (TS) occurred on 33 days a year on average, and snowfall on 11.
The wind most often blows from S (180°) - 12% of reports. Calm (0 kt) made up 17% of reports, and gusts of 25 kt or more appeared in 4%. Warmest month: July (average high 32.4 °C); coldest: January (average low -1.1 °C).
Day counts are for the selected period (for all years - the yearly average).
The top of each bar is the average daily high, the bottom the average daily low (usually around dawn), in °C.
Most often: S - 12% of reports. Each petal shows the direction the wind blows from (as in METAR) - the longer it is, the more often. Colour shows wind speed.
| Month | Avg high °C | Avg low °C | VFR | IFR/LIFR | Fog days | Thunderstorm days | Snow days |
|---|---|---|---|---|---|---|---|
| January | 7.3 | -1.1 | 83% | 8% | 2.3 | 0 | 4.7 |
| February | 11.2 | 0.8 | 86% | 8% | 1 | 0.3 | 3.3 |
| March | 16.0 | 4.0 | 85% | 8% | 0.7 | 0.3 | 0.3 |
| April | 21.6 | 9.5 | 85% | 6% | 0 | 2 | 0 |
| May | 24.1 | 13.3 | 81% | 8% | 0.7 | 5.3 | 0 |
| June | 29.6 | 17.8 | 84% | 9% | 0.3 | 4.7 | 0 |
| July | 32.4 | 21.7 | 91% | 3% | 0.3 | 11 | 0 |
| August | 29.7 | 18.8 | 85% | 4% | 0 | 5.7 | 0 |
| September | 26.6 | 16.2 | 77% | 9% | 0.3 | 2.3 | 0 |
| October | 21.5 | 8.8 | 90% | 3% | 0.3 | 0.7 | 0 |
| November | 15.3 | 3.8 | 92% | 3% | 0.7 | 0 | 0.3 |
| December | 8.7 | -0.5 | 81% | 11% | 3.3 | 0.7 | 2.7 |
Temperatures are averages of daily highs and lows. Day counts are the average per month over the period.
According to OurAirports data (compiled from AIP and FAA sources), Washington Dulles International Airport has 4 runways: 01C/19C - 3,505 m long (11,500 ft), 46 m wide, asphalt surface; 01L/19R - 2,865 m long (9,400 ft), 46 m wide, asphalt surface; 01R/19L - 3,505 m long (11,500 ft), 46 m wide, asphalt surface; 12/30 - 3,201 m long (10,501 ft), 46 m wide, asphalt surface.
The longest of them is 01C/19C, at 3,505 m.
The thresholds are oriented as follows: 01C/19C on 10° and 190° magnetic, 01L/19R on 10° and 190° magnetic, 01R/19L on 10° and 190° magnetic, 12/30 on 120° and 300° magnetic. A threshold designator is its magnetic heading divided by ten (ICAO Annex 14), so the runway axis can be read straight off the numbers.
For the 01C/19C axis, wind from the east (around 100°) or from the west (around 280°) blows perpendicular to the runway and produces the largest crosswind component. Wind from around 10° or 190° acts along the runway, as a headwind or a tailwind. The decoder on this page computes those components automatically from the current METAR.
Weather reports for Washington Dulles International Airport are published under the ICAO code KIAD. A METAR is an observation of current conditions, usually issued every 30 or 60 minutes; a TAF is a forecast for the airport area, typically covering 9 to 30 hours.
The decoder breaks the KIAD report down into its parts: wind direction and speed including gusts and variability, visibility (including CAVOK and directional minimum visibility), weather phenomena by WMO code, cloud layers with their bases, temperature and dew point, QNH pressure, and the resulting flight category - VFR, MVFR, IFR or LIFR - using FAA thresholds.
Not every airport issues its own reports; many smaller airfields have no weather station. If no current data is available for KIAD, check the nearby airports listed below.
Reports always use UTC (the Z suffix). The America/New_York zone is GMT-05:00 in winter and GMT-04:00 in summer - that is the shift to apply to the time in the report to get local time at the airport.
The closest airports in the database, measured in a straight line from the reference point, are Leesburg Executive Airport (KJYO, 17 km), Washington Manassas Harry P. Davis Field (KHEF, 25 km), Davison Army Air Field (Fort Belvoir) (KDAA, 35 km). When no report is available for KIAD, they usually give the best approximation of conditions in the area.
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The METAR archive for KIAD goes back to 16/11/1962. Pick a date and see every observation from that day.
Run a flying club, a training organisation or an airfield website? Embed a ready-made panel with the current KIAD METAR - flight category, wind, visibility, temperature and pressure, refreshed automatically. The configurator lets you pick language, theme and units; you paste the code once.
