Union, South Carolina · field elev 610 ft
Density Altitude at Union County, Troy Shelton Field (35A)
Union County, Troy Shelton Field sits at 610 ft, and even a typical July afternoon (90 °F) only lifts density altitude to about 2,755 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 | 41.0 | −434 ft | 52.9 | 369 ft |
| February | 44.7 | −182 ft | 57.3 | 660 ft |
| March | 51.1 | 249 ft | 64.6 | 1,136 ft |
| April | 60.3 | 856 ft | 74.0 | 1,737 ft |
| May | 68.0 | 1,355 ft | 80.6 | 2,151 ft |
| June | 75.8 | 1,850 ft | 87.1 | 2,553 ft |
| July | 79.3 | 2,070 ft | 90.4 | 2,755 ft |
| August | 78.0 | 1,989 ft | 88.7 | 2,651 ft |
| September | 72.1 | 1,616 ft | 83.2 | 2,312 ft |
| October | 60.7 | 882 ft | 73.7 | 1,718 ft |
| November | 50.2 | 189 ft | 63.4 | 1,058 ft |
| December | 43.5 | −263 ft | 55.4 | 534 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 35A
DENSITY ALTITUDE
Field elevation 610 ft — the air behaves like 2,730 ft.
- PRESSURE ALT
- 611 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 South Carolina fields
- KLUX — Laurens County
Laurens · elev 698 ft
- KSPA — Spartanburg Downtown Meml/Simpson Field
Spartanburg · elev 802 ft
- KEOE — Newberry County
Newberry · elev 570 ft
- KDCM — Chester Catawba Regional
Chester · elev 657 ft
- KGSP — Greenville Spartanburg International
Greer · elev 964 ft
- KUZA — Rock Hill/York County/Bryant Field
Rock Hill · elev 666 ft
- KFDW — Fairfield County
Winnsboro · elev 578 ft
- KGMU — Greenville Downtown
Greenville · elev 1,048 ft
Frequently asked questions
How high does density altitude get at 35A in summer?
On a typical July afternoon — around 90 °F at the nearest NOAA normals station — density altitude at Union County, Troy Shelton Field reaches roughly 2,755 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 35A on an average day?
It swings with the seasons: from roughly −434 ft at the coldest month's average temperature to about 2,070 ft at the warmest month's — all from a constant field elevation of 610 ft. The month-by-month table above carries the full year.
What is the field elevation of Union County, Troy Shelton Field?
610 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 35A (FAA), in Union, South Carolina.