Gaithersburg, Maryland · field elev 539 ft
Density Altitude at Montgomery County Airpark (KGAI)
Montgomery County Airpark sits at 539 ft, and even a typical July afternoon (87 °F) only lifts density altitude to about 2,466 ft — heat still trims performance, but the field rarely turns high-and-hot.
Typical density altitude by month
| Month | Avg temp °F | DA at avg temp | Afternoon high °F | DA on a typical afternoon |
|---|---|---|---|---|
| January | 34.5 | −971 ft | 42.2 | −440 ft |
| February | 36.7 | −818 ft | 45.0 | −250 ft |
| March | 44.8 | −263 ft | 53.7 | 334 ft |
| April | 55.7 | 466 ft | 65.9 | 1,132 ft |
| May | 64.6 | 1,048 ft | 74.3 | 1,669 ft |
| June | 72.9 | 1,580 ft | 82.2 | 2,164 ft |
| July | 78.0 | 1,902 ft | 87.1 | 2,466 ft |
| August | 75.9 | 1,770 ft | 84.9 | 2,331 ft |
| September | 68.7 | 1,312 ft | 77.5 | 1,870 ft |
| October | 57.0 | 552 ft | 65.9 | 1,132 ft |
| November | 46.9 | −121 ft | 55.7 | 466 ft |
| December | 38.5 | −694 ft | 46.0 | −182 ft |
▲ above 5,000 ft · ⚠ above 8,000 ft. These are planning references at standard pressure and dry air — afternoon humidity and low pressure both push the real number higher. Run today's values below.
Run today’s numbers for KGAI
DENSITY ALTITUDE
Field elevation 539 ft — the air behaves like 2,460 ft.
- PRESSURE ALT
- 540 ft
- ISA DEVIATION
- —
- RULE-OF-THUMB DA
- —
- AIR DENSITY INDEX
- —
- AIR DENSITY
- —
- WATER · GRAINS/LB
- —
For training and reference · verify with official sources and your POH before flight · no tool on this site renders a go / no-go judgment
Nearby Maryland fields
- W50 — Davis
Laytonsville · elev 609 ft
- KCGS — College Park
College Park · elev 49 ft
- KFDK — Frederick Municipal
Frederick · elev 309 ft
- 2W2 — Clearview Airpark
Westminster · elev 799 ft
- KFME — Fort Meade Exec
Fort Meade (Odenton) · elev 150 ft
- W00 — Freeway
Bowie · elev 168 ft
- KBWI — Baltimore/Washington International Thurgood Marshall
Baltimore · elev 143 ft
- KVKX — Potomac Airfield
Friendly · elev 118 ft
Frequently asked questions
How high does density altitude get at KGAI in summer?
On a typical July afternoon — around 87 °F at the nearest NOAA normals station — density altitude at Montgomery County Airpark reaches roughly 2,466 ft at standard pressure. Hotter-than-normal days, low pressure, and humidity all push it higher, so run the day's actual numbers before flying.
What is the density altitude at KGAI on an average day?
It swings with the seasons: from roughly −971 ft at the coldest month's average temperature to about 1,902 ft at the warmest month's — all from a constant field elevation of 539 ft. The month-by-month table above carries the full year.
What is the field elevation of Montgomery County Airpark?
539 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KGAI (ICAO) / GAI (FAA), in Gaithersburg, Maryland.