Colebrook, New Hampshire · field elev 1,017 ft
Density Altitude at Gifford Field (4C4)
Gifford Field sits at 1,017 ft, and even a typical July afternoon (77 °F) only lifts density altitude to about 2,424 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 | 12.3 | −1,957 ft | 24.3 | −1,091 ft |
| February | 13.6 | −1,862 ft | 27.0 | −899 ft |
| March | 23.7 | −1,133 ft | 36.2 | −257 ft |
| April | 37.8 | −147 ft | 50.0 | 679 ft |
| May | 50.7 | 726 ft | 64.0 | 1,598 ft |
| June | 59.9 | 1,332 ft | 72.4 | 2,134 ft |
| July | 64.7 | 1,643 ft | 77.0 | 2,424 ft |
| August | 62.9 | 1,527 ft | 75.6 | 2,336 ft |
| September | 55.6 | 1,050 ft | 68.2 | 1,867 ft |
| October | 43.4 | 235 ft | 54.9 | 1,004 ft |
| November | 31.6 | −576 ft | 41.5 | 106 ft |
| December | 20.0 | −1,398 ft | 29.8 | −702 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 4C4
DENSITY ALTITUDE
Field elevation 1,017 ft — the air behaves like 2,424 ft.
- PRESSURE ALT
- 1,018 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 Hampshire fields
- KERR — Errol
Errol · elev 1,248 ft
- KBML — Berlin Regional
Berlin · elev 1,161 ft
- KHIE — Mount Washington Regional
Whitefield · elev 1,072 ft
- 2G8 — Gorham
Gorham · elev 835 ft
- 8B2 — Twin Mountain
Twin Mountain · elev 1,459 ft
- 1B5 — Franconia
Franconia · elev 975 ft
- 5B9 — Dean Meml
Haverhill · elev 582 ft
- 1P1 — Plymouth Municipal
Plymouth · elev 506 ft
Frequently asked questions
How high does density altitude get at 4C4 in summer?
On a typical July afternoon — around 77 °F at the nearest NOAA normals station — density altitude at Gifford Field reaches roughly 2,424 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 4C4 on an average day?
It swings with the seasons: from roughly −1,957 ft at the coldest month's average temperature to about 1,643 ft at the warmest month's — all from a constant field elevation of 1,017 ft. The month-by-month table above carries the full year.
What is the field elevation of Gifford Field?
1,017 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 4C4 (FAA), in Colebrook, New Hampshire.