Meddybemps, Maine · field elev 200 ft
Density Altitude at Gillespie Field (66B)
Gillespie Field sits at 200 ft, and even a typical July afternoon (80 °F) only lifts density altitude to about 1,612 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 | 20.6 | −2,382 ft | 28.3 | −1,830 ft |
| February | 22.5 | −2,245 ft | 31.1 | −1,633 ft |
| March | 31.6 | −1,597 ft | 39.2 | −1,068 ft |
| April | 43.7 | −759 ft | 51.8 | −212 ft |
| May | 55.2 | 14 ft | 64.4 | 618 ft |
| June | 64.9 | 650 ft | 74.0 | 1,234 ft |
| July | 71.1 | 1,049 ft | 80.0 | 1,612 ft |
| August | 69.8 | 966 ft | 79.2 | 1,562 ft |
| September | 61.4 | 422 ft | 70.9 | 1,037 ft |
| October | 50.1 | −326 ft | 58.0 | 199 ft |
| November | 39.4 | −1,054 ft | 45.8 | −617 ft |
| December | 28.4 | −1,823 ft | 34.8 | −1,373 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 66B
DENSITY ALTITUDE
Field elevation 200 ft — the air behaves like 1,612 ft.
- PRESSURE ALT
- 201 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 Maine fields
- KPNN — Princeton Municipal
Princeton · elev 265 ft
- KEPM — Eastport Municipal
Eastport · elev 45 ft
- 65B — Lubec Municipal
Lubec · elev 85 ft
- KMVM — Machias Valley
Machias · elev 96 ft
- ME2 — Cutler Regional
Cutler · elev 55 ft
- 43B — Deblois Flight Strip
Deblois · elev 218 ft
- KLRG — Lincoln Regional
Lincoln · elev 208 ft
- KBHB — Hancock County/Bar Harbor
Bar Harbor · elev 83 ft
Frequently asked questions
How high does density altitude get at 66B in summer?
On a typical July afternoon — around 80 °F at the nearest NOAA normals station — density altitude at Gillespie Field reaches roughly 1,612 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 66B on an average day?
It swings with the seasons: from roughly −2,382 ft at the coldest month's average temperature to about 1,049 ft at the warmest month's — all from a constant field elevation of 200 ft. The month-by-month table above carries the full year.
What is the field elevation of Gillespie Field?
200 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 66B (FAA), in Meddybemps, Maine.