Groton (New London), Connecticut · field elev 9 ft
Density Altitude at Groton-New London (KGON)
Groton-New London sits at 9 ft, and even a typical July afternoon (80 °F) only lifts density altitude to about 1,366 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 | 30.8 | −1,893 ft | 38.3 | −1,368 ft |
| February | 32.4 | −1,780 ft | 40.2 | −1,237 ft |
| March | 38.6 | −1,348 ft | 46.6 | −800 ft |
| April | 47.6 | −732 ft | 56.2 | −156 ft |
| May | 56.8 | −116 ft | 64.8 | 409 ft |
| June | 66.0 | 486 ft | 73.8 | 987 ft |
| July | 72.3 | 891 ft | 79.8 | 1,366 ft |
| August | 71.5 | 840 ft | 79.2 | 1,328 ft |
| September | 65.2 | 435 ft | 73.5 | 968 ft |
| October | 54.4 | −275 ft | 63.2 | 304 ft |
| November | 45.1 | −901 ft | 53.3 | −349 ft |
| December | 36.5 | −1,493 ft | 43.9 | −983 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 KGON
DENSITY ALTITUDE
Field elevation 9 ft — the air behaves like 1,379 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
- 42B — Goodspeed
East Haddam · elev 9 ft
- KSNC — Chester
Chester · elev 416 ft
- 9B8 — Salmon River Airfield
Marlborough · elev 540 ft
- KIJD — Windham
Willimantic · elev 246 ft
- KLZD — Danielson
Danielson · elev 238 ft
- KHFD — Hartford-Brainard
Hartford · elev 18 ft
- KMMK — Meriden Markham Municipal
Meriden · elev 103 ft
- C44 — Toutant
Putnam · elev 770 ft
Frequently asked questions
How high does density altitude get at KGON in summer?
On a typical July afternoon — around 80 °F at the nearest NOAA normals station — density altitude at Groton-New London reaches roughly 1,366 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 KGON on an average day?
It swings with the seasons: from roughly −1,893 ft at the coldest month's average temperature to about 891 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 Groton-New London?
9 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KGON (ICAO) / GON (FAA), in Groton (New London), Connecticut.