Jonesville, North Carolina · field elev 1,137 ft
Density Altitude at Swan Creek (78A)
Swan Creek sits at 1,137 ft, and even a typical July afternoon (87 °F) only lifts density altitude to about 3,195 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 | 35.9 | −128 ft | 48.7 | 741 ft |
| February | 38.4 | 44 ft | 52.4 | 987 ft |
| March | 45.5 | 526 ft | 60.3 | 1,506 ft |
| April | 54.9 | 1,152 ft | 70.0 | 2,129 ft |
| May | 64.0 | 1,745 ft | 77.2 | 2,583 ft |
| June | 72.2 | 2,269 ft | 84.3 | 3,023 ft |
| July | 75.9 | 2,502 ft | 87.1 | 3,195 ft |
| August | 74.5 | 2,414 ft | 85.8 | 3,115 ft |
| September | 68.6 | 2,040 ft | 80.3 | 2,776 ft |
| October | 56.8 | 1,277 ft | 71.3 | 2,212 ft |
| November | 46.2 | 573 ft | 60.7 | 1,532 ft |
| December | 39.0 | 85 ft | 51.5 | 928 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 78A
DENSITY ALTITUDE
Field elevation 1,137 ft — the air behaves like 3,189 ft.
- PRESSURE ALT
- 1,138 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 North Carolina fields
- KZEF — Elkin Municipal
Elkin · elev 1,067 ft
- KUKF — Wilkes County
North Wilkesboro · elev 1,303 ft
- 80C — Lone Hickory
Yadkinville · elev 1,015 ft
- KMWK — Mount Airy/Surry County
Mount Airy · elev 1,269 ft
- NC2 — Taylorsville
Taylorsville · elev 1,090 ft
- 8A7 — Twin Lakes
Mocksville · elev 818 ft
- KSVH — Statesville Regional
Statesville · elev 968 ft
- KGEV — Ashe County
Jefferson · elev 3,178 ft
Frequently asked questions
How high does density altitude get at 78A in summer?
On a typical July afternoon — around 87 °F at the nearest NOAA normals station — density altitude at Swan Creek reaches roughly 3,195 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 78A on an average day?
It swings with the seasons: from roughly −128 ft at the coldest month's average temperature to about 2,502 ft at the warmest month's — all from a constant field elevation of 1,137 ft. The month-by-month table above carries the full year.
What is the field elevation of Swan Creek?
1,137 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 78A (FAA), in Jonesville, North Carolina.