Hillsboro, New Hampshire · field elev 600 ft
Density Altitude at Hawthorne-Feather Airpark (8B1)
Hawthorne-Feather Airpark sits at 600 ft, and even a typical July afternoon (80 °F) only lifts density altitude to about 2,076 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 | 22.2 | −1,764 ft | 31.0 | −1,139 ft |
| February | 24.3 | −1,614 ft | 34.3 | −909 ft |
| March | 32.4 | −1,041 ft | 41.8 | −392 ft |
| April | 43.8 | −255 ft | 54.7 | 476 ft |
| May | 55.9 | 555 ft | 66.6 | 1,252 ft |
| June | 64.6 | 1,123 ft | 74.5 | 1,756 ft |
| July | 69.7 | 1,451 ft | 79.6 | 2,076 ft |
| August | 67.8 | 1,329 ft | 77.7 | 1,957 ft |
| September | 60.3 | 844 ft | 70.7 | 1,515 ft |
| October | 48.3 | 49 ft | 58.4 | 720 ft |
| November | 38.3 | −632 ft | 46.8 | −52 ft |
| December | 28.3 | −1,330 ft | 36.9 | −728 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 8B1
DENSITY ALTITUDE
Field elevation 600 ft — the air behaves like 2,101 ft.
- PRESSURE ALT
- 601 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
- KAFN — Jaffrey Airfield Silver Ranch
Jaffrey · elev 1,040 ft
- KEEN — Dillant/Hopkins
Keene · elev 488 ft
- KCON — Concord Municipal
Concord · elev 342 ft
- KMHT — Manchester Boston Regional
Manchester · elev 266 ft
- 2B3 — Parlin Field
Newport · elev 784 ft
- KASH — Boire Field
Nashua · elev 200 ft
- KCNH — Claremont Municipal
Claremont · elev 543 ft
- 2N2 — Newfound Valley
Bristol · elev 510 ft
Frequently asked questions
How high does density altitude get at 8B1 in summer?
On a typical July afternoon — around 80 °F at the nearest NOAA normals station — density altitude at Hawthorne-Feather Airpark reaches roughly 2,076 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 8B1 on an average day?
It swings with the seasons: from roughly −1,764 ft at the coldest month's average temperature to about 1,451 ft at the warmest month's — all from a constant field elevation of 600 ft. The month-by-month table above carries the full year.
What is the field elevation of Hawthorne-Feather Airpark?
600 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 8B1 (FAA), in Hillsboro, New Hampshire.