Williamstown, New Jersey · field elev 145 ft
Density Altitude at Southern Cross (C01)
Southern Cross sits at 145 ft, and even a typical July afternoon (87 °F) only lifts density altitude to about 1,968 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 | 33.2 | −1,554 ft | 41.3 | −992 ft |
| February | 35.1 | −1,421 ft | 44.2 | −794 ft |
| March | 42.6 | −903 ft | 52.0 | −267 ft |
| April | 52.5 | −234 ft | 63.6 | 498 ft |
| May | 62.3 | 413 ft | 72.5 | 1,071 ft |
| June | 71.9 | 1,033 ft | 82.0 | 1,670 ft |
| July | 77.0 | 1,356 ft | 86.8 | 1,968 ft |
| August | 75.2 | 1,243 ft | 84.6 | 1,832 ft |
| September | 69.1 | 854 ft | 78.7 | 1,463 ft |
| October | 56.3 | 19 ft | 66.8 | 706 ft |
| November | 45.8 | −685 ft | 55.1 | −60 ft |
| December | 38.0 | −1,220 ft | 46.0 | −671 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 C01
DENSITY ALTITUDE
Field elevation 145 ft — the air behaves like 1,980 ft.
- PRESSURE ALT
- 146 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
- 17N — Cross Keys
Cross Keys · elev 162 ft
- 28N — Vineland-Downstown
Vineland · elev 120 ft
- 19N — Pine Valley
Berlin · elev 150 ft
- 29N — Kroelinger
Vineland · elev 93 ft
- N81 — Hammonton Municipal
Hammonton · elev 65 ft
- 00N — Bucks
Bridgeton · elev 108 ft
- KMIV — Millville Municipal
Millville · elev 85 ft
- KVAY — South Jersey Regional
Mount Holly · elev 53 ft
Frequently asked questions
How high does density altitude get at C01 in summer?
On a typical July afternoon — around 87 °F at the nearest NOAA normals station — density altitude at Southern Cross reaches roughly 1,968 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 C01 on an average day?
It swings with the seasons: from roughly −1,554 ft at the coldest month's average temperature to about 1,356 ft at the warmest month's — all from a constant field elevation of 145 ft. The month-by-month table above carries the full year.
What is the field elevation of Southern Cross?
145 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is C01 (FAA), in Williamstown, New Jersey.