Quincy, Florida · field elev 221 ft
Density Altitude at Quincy Municipal (2J9)
Quincy Municipal sits at 221 ft, and even a typical July afternoon (91 °F) only lifts density altitude to about 2,336 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 | 51.9 | −180 ft | 63.9 | 611 ft |
| February | 54.0 | −40 ft | 66.8 | 799 ft |
| March | 59.5 | 324 ft | 72.6 | 1,171 ft |
| April | 66.1 | 754 ft | 78.9 | 1,569 ft |
| May | 74.2 | 1,272 ft | 86.2 | 2,023 ft |
| June | 79.4 | 1,600 ft | 89.9 | 2,251 ft |
| July | 81.5 | 1,732 ft | 91.3 | 2,336 ft |
| August | 81.2 | 1,713 ft | 90.8 | 2,306 ft |
| September | 77.7 | 1,494 ft | 87.9 | 2,128 ft |
| October | 69.4 | 966 ft | 81.1 | 1,707 ft |
| November | 60.0 | 357 ft | 73.0 | 1,196 ft |
| December | 54.0 | −40 ft | 66.5 | 780 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 2J9
DENSITY ALTITUDE
Field elevation 221 ft — the air behaves like 2,318 ft.
- PRESSURE ALT
- 222 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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Frequently asked questions
How high does density altitude get at 2J9 in summer?
On a typical July afternoon — around 91 °F at the nearest NOAA normals station — density altitude at Quincy Municipal reaches roughly 2,336 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 2J9 on an average day?
It swings with the seasons: from roughly −180 ft at the coldest month's average temperature to about 1,732 ft at the warmest month's — all from a constant field elevation of 221 ft. The month-by-month table above carries the full year.
What is the field elevation of Quincy Municipal?
221 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 2J9 (FAA), in Quincy, Florida.