Huntsville, Alabama · field elev 655 ft
Density Altitude at Moontown (3M5)
Moontown sits at 655 ft, and even a typical August afternoon (88 °F) only lifts density altitude to about 2,681 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 | 39.9 | −453 ft | 50.3 | 251 ft |
| February | 43.4 | −214 ft | 54.7 | 544 ft |
| March | 50.8 | 284 ft | 62.8 | 1,074 ft |
| April | 58.8 | 814 ft | 71.4 | 1,627 ft |
| May | 67.1 | 1,352 ft | 78.4 | 2,069 ft |
| June | 74.7 | 1,836 ft | 85.5 | 2,509 ft |
| July | 78.2 | 2,056 ft | 88.1 | 2,669 ft |
| August | 77.4 | 2,006 ft | 88.3 | 2,681 ft |
| September | 71.5 | 1,633 ft | 83.6 | 2,392 ft |
| October | 60.5 | 925 ft | 73.7 | 1,773 ft |
| November | 49.2 | 177 ft | 61.8 | 1,009 ft |
| December | 42.6 | −269 ft | 53.1 | 438 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 3M5
DENSITY ALTITUDE
Field elevation 655 ft — the air behaves like 2,663 ft.
- PRESSURE ALT
- 656 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 Alabama fields
- KMDQ — Huntsville Exec Tom Sharp Jr Field
Huntsville · elev 763 ft
- M38 — Hazel Green
Hazel Green · elev 814 ft
- KHSV — Huntsville International-Carl T Jones Field
Huntsville · elev 629 ft
- 4A6 — Scottsboro Municipal-Word Field
Scottsboro · elev 651 ft
- 8A1 — Guntersville Municipal/Joe Starnes Field
Guntersville · elev 615 ft
- KDCU — Pryor Field Regional
Decatur · elev 592 ft
- 5M0 — Hartselle/Morgan County Regional
Hartselle · elev 629 ft
- KBFZ — Albertville Regional/Thomas J Brumlik Field
Albertville · elev 1,032 ft
Frequently asked questions
How high does density altitude get at 3M5 in summer?
On a typical August afternoon — around 88 °F at the nearest NOAA normals station — density altitude at Moontown reaches roughly 2,681 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 3M5 on an average day?
It swings with the seasons: from roughly −453 ft at the coldest month's average temperature to about 2,056 ft at the warmest month's — all from a constant field elevation of 655 ft. The month-by-month table above carries the full year.
What is the field elevation of Moontown?
655 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 3M5 (FAA), in Huntsville, Alabama.