Harrisburg, Pennsylvania · field elev 310 ft
Density Altitude at Harrisburg International (KMDT)
Harrisburg International sits at 310 ft, and even a typical July afternoon (87 °F) only lifts density altitude to about 2,169 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 | 30.8 | −1,516 ft | 38.6 | −972 ft |
| February | 33.4 | −1,334 ft | 42.0 | −739 ft |
| March | 41.8 | −752 ft | 51.3 | −109 ft |
| April | 53.2 | 17 ft | 63.8 | 714 ft |
| May | 63.4 | 688 ft | 73.7 | 1,350 ft |
| June | 72.5 | 1,274 ft | 82.4 | 1,896 ft |
| July | 77.3 | 1,577 ft | 86.8 | 2,169 ft |
| August | 75.2 | 1,445 ft | 84.7 | 2,039 ft |
| September | 67.9 | 979 ft | 77.6 | 1,596 ft |
| October | 55.8 | 190 ft | 65.7 | 838 ft |
| November | 44.8 | −548 ft | 53.9 | 64 ft |
| December | 35.8 | −1,166 ft | 43.3 | −650 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 KMDT
DENSITY ALTITUDE
Field elevation 310 ft — the air behaves like 2,181 ft.
- PRESSURE ALT
- 311 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 Pennsylvania fields
- KCXY — Capital City
Harrisburg · elev 347 ft
- 58N — Reigle Field
Palmyra · elev 489 ft
- 0P8 — Lazy B Ranch
Dover · elev 476 ft
- N71 — Donegal Springs Airpark
Mount Joy/Marietta · elev 458 ft
- 2N5 — Kampel
Wellsville · elev 611 ft
- 07N — Bermudian Valley Airpark
Kralltown · elev 470 ft
- KTHV — York
York · elev 495 ft
- N94 — Carlisle
Carlisle · elev 510 ft
Frequently asked questions
How high does density altitude get at KMDT in summer?
On a typical July afternoon — around 87 °F at the nearest NOAA normals station — density altitude at Harrisburg International reaches roughly 2,169 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 KMDT on an average day?
It swings with the seasons: from roughly −1,516 ft at the coldest month's average temperature to about 1,577 ft at the warmest month's — all from a constant field elevation of 310 ft. The month-by-month table above carries the full year.
What is the field elevation of Harrisburg International?
310 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KMDT (ICAO) / MDT (FAA), in Harrisburg, Pennsylvania.