East Haddam, Connecticut · field elev 9 ft
Density Altitude at Goodspeed (42B)
Goodspeed sits at 9 ft, and even a typical July afternoon (84 °F) only lifts density altitude to about 1,634 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 | 29.5 | −1,985 ft | 37.7 | −1,410 ft |
| February | 31.7 | −1,829 ft | 40.5 | −1,216 ft |
| March | 38.6 | −1,348 ft | 47.8 | −718 ft |
| April | 49.2 | −624 ft | 59.3 | 49 ft |
| May | 59.4 | 56 ft | 69.9 | 738 ft |
| June | 68.4 | 641 ft | 78.4 | 1,278 ft |
| July | 74.4 | 1,025 ft | 84.1 | 1,634 ft |
| August | 72.6 | 911 ft | 82.6 | 1,541 ft |
| September | 65.2 | 435 ft | 75.5 | 1,095 ft |
| October | 53.8 | −315 ft | 63.9 | 350 ft |
| November | 43.6 | −1,004 ft | 53.0 | −369 ft |
| December | 35.1 | −1,591 ft | 43.2 | −1,031 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 42B
DENSITY ALTITUDE
Field elevation 9 ft — the air behaves like 1,628 ft.
- PRESSURE ALT
- 10 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 Connecticut fields
- KSNC — Chester
Chester · elev 416 ft
- 9B8 — Salmon River Airfield
Marlborough · elev 540 ft
- KMMK — Meriden Markham Municipal
Meriden · elev 103 ft
- KHFD — Hartford-Brainard
Hartford · elev 18 ft
- KGON — Groton-New London
Groton (New London) · elev 9 ft
- KIJD — Windham
Willimantic · elev 246 ft
- KHVN — Tweed/New Haven
New Haven · elev 13 ft
- 4B8 — Robertson Field
Plainville · elev 202 ft
Frequently asked questions
How high does density altitude get at 42B in summer?
On a typical July afternoon — around 84 °F at the nearest NOAA normals station — density altitude at Goodspeed reaches roughly 1,634 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 42B on an average day?
It swings with the seasons: from roughly −1,985 ft at the coldest month's average temperature to about 1,025 ft at the warmest month's — all from a constant field elevation of 9 ft. The month-by-month table above carries the full year.
What is the field elevation of Goodspeed?
9 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 42B (FAA), in East Haddam, Connecticut.