Keene, New York · field elev 985 ft
Density Altitude at Marcy Field (1I1)
Marcy Field sits at 985 ft, and even a typical July afternoon (74 °F) only lifts density altitude to about 2,221 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 | 14.3 | −1,851 ft | 23.3 | −1,202 ft |
| February | 15.3 | −1,779 ft | 25.5 | −1,046 ft |
| March | 24.3 | −1,131 ft | 34.2 | −435 ft |
| April | 37.6 | −201 ft | 47.7 | 486 ft |
| May | 50.2 | 653 ft | 61.0 | 1,364 ft |
| June | 59.4 | 1,260 ft | 69.6 | 1,917 ft |
| July | 63.7 | 1,539 ft | 74.4 | 2,221 ft |
| August | 61.9 | 1,422 ft | 72.4 | 2,095 ft |
| September | 54.9 | 965 ft | 65.5 | 1,655 ft |
| October | 43.9 | 230 ft | 52.2 | 786 ft |
| November | 32.9 | −526 ft | 39.8 | −50 ft |
| December | 21.0 | −1,367 ft | 27.4 | −911 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 1I1
DENSITY ALTITUDE
Field elevation 985 ft — the air behaves like 2,196 ft.
- PRESSURE ALT
- 986 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
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- 4B6 — Ticonderoga Municipal
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- KPBG — Plattsburgh International
Plattsburgh · elev 234 ft
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- KGFL — Floyd Bennett Meml
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Frequently asked questions
How high does density altitude get at 1I1 in summer?
On a typical July afternoon — around 74 °F at the nearest NOAA normals station — density altitude at Marcy Field reaches roughly 2,221 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 1I1 on an average day?
It swings with the seasons: from roughly −1,851 ft at the coldest month's average temperature to about 1,539 ft at the warmest month's — all from a constant field elevation of 985 ft. The month-by-month table above carries the full year.
What is the field elevation of Marcy Field?
985 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 1I1 (FAA), in Keene, New York.