Morristown, New Jersey · field elev 187 ft
Density Altitude at Morristown Municipal (KMMU)
Morristown Municipal sits at 187 ft, and even a typical July afternoon (86 °F) only lifts density altitude to about 1,988 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 | 30.7 | −1,677 ft | 39.5 | −1,064 ft |
| February | 32.4 | −1,557 ft | 41.8 | −906 ft |
| March | 40.2 | −1,015 ft | 49.8 | −363 ft |
| April | 51.5 | −248 ft | 62.4 | 472 ft |
| May | 61.4 | 406 ft | 72.3 | 1,110 ft |
| June | 70.7 | 1,008 ft | 81.5 | 1,690 ft |
| July | 76.0 | 1,345 ft | 86.3 | 1,988 ft |
| August | 74.2 | 1,231 ft | 84.7 | 1,889 ft |
| September | 67.1 | 777 ft | 77.9 | 1,465 ft |
| October | 54.9 | −22 ft | 65.6 | 680 ft |
| November | 44.5 | −721 ft | 54.2 | −68 ft |
| December | 35.9 | −1,313 ft | 44.1 | −748 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 KMMU
DENSITY ALTITUDE
Field elevation 187 ft — the air behaves like 1,969 ft.
- PRESSURE ALT
- 188 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 New Jersey fields
- KCDW — Essex County
Caldwell · elev 172 ft
- N07 — Lincoln Park
Lincoln Park · elev 181 ft
- KEWR — Newark Liberty International
Newark · elev 18 ft
- KLDJ — Linden
Linden · elev 22 ft
- KSMQ — Somerset
Somerville · elev 106 ft
- KTEB — Teterboro
Teterboro · elev 8 ft
- 47N — Central Jersey Regional
Manville · elev 86 ft
- 12N — Aeroflex/Andover
Andover · elev 583 ft
Frequently asked questions
How high does density altitude get at KMMU in summer?
On a typical July afternoon — around 86 °F at the nearest NOAA normals station — density altitude at Morristown Municipal reaches roughly 1,988 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 KMMU on an average day?
It swings with the seasons: from roughly −1,677 ft at the coldest month's average temperature to about 1,345 ft at the warmest month's — all from a constant field elevation of 187 ft. The month-by-month table above carries the full year.
What is the field elevation of Morristown Municipal?
187 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KMMU (ICAO) / MMU (FAA), in Morristown, New Jersey.