Blairstown, New Jersey · field elev 372 ft
Density Altitude at Blairstown (1N7)
Blairstown sits at 372 ft, and even a typical July afternoon (84 °F) only lifts density altitude to about 2,078 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 | 27.3 | −1,686 ft | 36.5 | −1,040 ft |
| February | 29.2 | −1,551 ft | 39.8 | −813 ft |
| March | 37.0 | −1,006 ft | 48.1 | −248 ft |
| April | 48.3 | −234 ft | 60.6 | 582 ft |
| May | 58.5 | 445 ft | 70.9 | 1,248 ft |
| June | 67.4 | 1,023 ft | 79.3 | 1,779 ft |
| July | 72.3 | 1,337 ft | 84.1 | 2,078 ft |
| August | 71.0 | 1,254 ft | 82.6 | 1,985 ft |
| September | 64.1 | 810 ft | 76.3 | 1,590 ft |
| October | 52.3 | 34 ft | 64.2 | 817 ft |
| November | 41.3 | −710 ft | 52.4 | 41 ft |
| December | 32.5 | −1,319 ft | 41.4 | −703 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 1N7
DENSITY ALTITUDE
Field elevation 372 ft — the air behaves like 2,071 ft.
- PRESSURE ALT
- 373 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
- N05 — Hackettstown
Hackettstown · elev 670 ft
- 12N — Aeroflex/Andover
Andover · elev 583 ft
- KFWN — Sussex
Sussex · elev 422 ft
- N85 — Alexandria
Pittstown · elev 480 ft
- N40 — Sky Manor
Pittstown · elev 560 ft
- KSMQ — Somerset
Somerville · elev 106 ft
- N51 — Solberg/Hunterdon
Readington · elev 190 ft
- KMMU — Morristown Municipal
Morristown · elev 187 ft
Frequently asked questions
How high does density altitude get at 1N7 in summer?
On a typical July afternoon — around 84 °F at the nearest NOAA normals station — density altitude at Blairstown reaches roughly 2,078 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 1N7 on an average day?
It swings with the seasons: from roughly −1,686 ft at the coldest month's average temperature to about 1,337 ft at the warmest month's — all from a constant field elevation of 372 ft. The month-by-month table above carries the full year.
What is the field elevation of Blairstown?
372 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 1N7 (FAA), in Blairstown, New Jersey.