Chambersburg, Pennsylvania · field elev 688 ft
Density Altitude at Franklin County Regional (N68)
Franklin County Regional sits at 688 ft, and even a typical July afternoon (85 °F) only lifts density altitude to about 2,513 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 | 30.2 | −1,086 ft | 37.4 | −584 ft |
| February | 32.7 | −910 ft | 40.9 | −344 ft |
| March | 41.1 | −330 ft | 50.4 | 299 ft |
| April | 52.4 | 432 ft | 63.2 | 1,141 ft |
| May | 62.1 | 1,070 ft | 72.6 | 1,744 ft |
| June | 70.7 | 1,623 ft | 80.8 | 2,259 ft |
| July | 74.8 | 1,883 ft | 84.9 | 2,513 ft |
| August | 72.9 | 1,763 ft | 82.9 | 2,389 ft |
| September | 65.7 | 1,303 ft | 75.6 | 1,933 ft |
| October | 54.3 | 558 ft | 64.0 | 1,193 ft |
| November | 43.5 | −167 ft | 52.1 | 412 ft |
| December | 34.4 | −792 ft | 41.4 | −310 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 N68
DENSITY ALTITUDE
Field elevation 688 ft — the air behaves like 2,519 ft.
- PRESSURE ALT
- 689 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 Pennsylvania fields
- W73 — Mid Atlantic Soaring Center
Fairfield · elev 573 ft
- W05 — Gettysburg Regional
Gettysburg · elev 553 ft
- N94 — Carlisle
Carlisle · elev 510 ft
- 07N — Bermudian Valley Airpark
Kralltown · elev 470 ft
- P17 — Greater Breezewood Regional
Breezewood · elev 1,345 ft
- 2N5 — Kampel
Wellsville · elev 611 ft
- KTHV — York
York · elev 495 ft
- KAOO — Altoona/Blair County
Altoona · elev 1,503 ft
Frequently asked questions
How high does density altitude get at N68 in summer?
On a typical July afternoon — around 85 °F at the nearest NOAA normals station — density altitude at Franklin County Regional reaches roughly 2,513 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 N68 on an average day?
It swings with the seasons: from roughly −1,086 ft at the coldest month's average temperature to about 1,883 ft at the warmest month's — all from a constant field elevation of 688 ft. The month-by-month table above carries the full year.
What is the field elevation of Franklin County Regional?
688 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is N68 (FAA), in Chambersburg, Pennsylvania.