Dunnellon, Florida · field elev 65 ft
Density Altitude at Marion County (X35)
Marion County sits at 65 ft, and even a typical July afternoon (91 °F) only lifts density altitude to about 2,103 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 | 56.0 | −100 ft | 69.3 | 768 ft |
| February | 58.9 | 92 ft | 72.3 | 960 ft |
| March | 63.1 | 367 ft | 76.8 | 1,246 ft |
| April | 68.5 | 717 ft | 82.0 | 1,572 ft |
| May | 74.8 | 1,119 ft | 87.9 | 1,938 ft |
| June | 79.7 | 1,428 ft | 90.1 | 2,073 ft |
| July | 80.7 | 1,491 ft | 90.6 | 2,103 ft |
| August | 80.7 | 1,491 ft | 90.4 | 2,091 ft |
| September | 78.9 | 1,378 ft | 88.8 | 1,993 ft |
| October | 72.4 | 967 ft | 83.7 | 1,678 ft |
| November | 64.3 | 445 ft | 76.9 | 1,252 ft |
| December | 59.0 | 98 ft | 72.4 | 967 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 X35
DENSITY ALTITUDE
Field elevation 65 ft — the air behaves like 2,128 ft.
- PRESSURE ALT
- 66 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 Florida fields
- KOCF — Ocala International-Jim Taylor Field
Ocala · elev 90 ft
- KCGC — Crystal River/Davis Field
Crystal River · elev 9 ft
- KINF — Inverness
Inverness · elev 65 ft
- X60 — Williston Regional
Williston · elev 76 ft
- KLEE — Leesburg International
Leesburg · elev 76 ft
- 0J8 — Flying Ten
Archer · elev 92 ft
- KBKV — Brooksville-Tampa Bay Regional
Brooksville · elev 76 ft
- KCDK — George T Lewis
Cedar Key · elev 11 ft
Frequently asked questions
How high does density altitude get at X35 in summer?
On a typical July afternoon — around 91 °F at the nearest NOAA normals station — density altitude at Marion County reaches roughly 2,103 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 X35 on an average day?
It swings with the seasons: from roughly −100 ft at the coldest month's average temperature to about 1,491 ft at the warmest month's — all from a constant field elevation of 65 ft. The month-by-month table above carries the full year.
What is the field elevation of Marion County?
65 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is X35 (FAA), in Dunnellon, Florida.