Twin Mountain, New Hampshire · field elev 1,459 ft
Density Altitude at Twin Mountain (8B2)
Twin Mountain sits at 1,459 ft, and even a typical July afternoon (80 °F) only lifts density altitude to about 3,163 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 | 15.6 | −1,160 ft | 27.8 | −290 ft |
| February | 17.3 | −1,037 ft | 30.4 | −108 ft |
| March | 27.1 | −339 ft | 39.7 | 533 ft |
| April | 40.4 | 581 ft | 53.4 | 1,451 ft |
| May | 53.2 | 1,438 ft | 67.4 | 2,359 ft |
| June | 61.8 | 1,999 ft | 75.7 | 2,883 ft |
| July | 66.4 | 2,295 ft | 80.2 | 3,163 ft |
| August | 64.5 | 2,173 ft | 78.8 | 3,076 ft |
| September | 56.8 | 1,674 ft | 71.7 | 2,632 ft |
| October | 45.3 | 912 ft | 58.2 | 1,766 ft |
| November | 34.1 | 149 ft | 44.7 | 872 ft |
| December | 22.3 | −679 ft | 33.1 | 79 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 8B2
DENSITY ALTITUDE
Field elevation 1,459 ft — the air behaves like 3,151 ft.
- PRESSURE ALT
- 1,460 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
- KHIE — Mount Washington Regional
Whitefield · elev 1,072 ft
- 1B5 — Franconia
Franconia · elev 975 ft
- 2G8 — Gorham
Gorham · elev 835 ft
- 5B9 — Dean Meml
Haverhill · elev 582 ft
- KBML — Berlin Regional
Berlin · elev 1,161 ft
- 1P1 — Plymouth Municipal
Plymouth · elev 506 ft
- 4MB — Moultonborough
Moultonborough · elev 576 ft
- KERR — Errol
Errol · elev 1,248 ft
Frequently asked questions
How high does density altitude get at 8B2 in summer?
On a typical July afternoon — around 80 °F at the nearest NOAA normals station — density altitude at Twin Mountain reaches roughly 3,163 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 8B2 on an average day?
It swings with the seasons: from roughly −1,160 ft at the coldest month's average temperature to about 2,295 ft at the warmest month's — all from a constant field elevation of 1,459 ft. The month-by-month table above carries the full year.
What is the field elevation of Twin Mountain?
1,459 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 8B2 (FAA), in Twin Mountain, New Hampshire.