St Elmo, Alabama · field elev 132 ft
Density Altitude at St Elmo (2R5)
St Elmo sits at 132 ft, and even a typical August afternoon (88 °F) only lifts density altitude to about 2,044 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 | 49.8 | −431 ft | 59.7 | 227 ft |
| February | 53.0 | −216 ft | 63.4 | 469 ft |
| March | 58.6 | 155 ft | 69.2 | 844 ft |
| April | 65.4 | 599 ft | 75.9 | 1,271 ft |
| May | 72.5 | 1,055 ft | 81.6 | 1,629 ft |
| June | 78.1 | 1,410 ft | 86.1 | 1,908 ft |
| July | 80.4 | 1,554 ft | 88.1 | 2,032 ft |
| August | 80.4 | 1,554 ft | 88.3 | 2,044 ft |
| September | 77.1 | 1,347 ft | 85.6 | 1,878 ft |
| October | 68.1 | 773 ft | 78.4 | 1,429 ft |
| November | 58.0 | 115 ft | 68.9 | 825 ft |
| December | 52.0 | −283 ft | 61.6 | 352 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 2R5
DENSITY ALTITUDE
Field elevation 132 ft — the air behaves like 2,026 ft.
- PRESSURE ALT
- 133 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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- 5R7 — Roy E Ray
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- KBFM — Mobile International
Mobile · elev 26 ft
- 4R9 — Jeremiah Denton
Dauphin Island · elev 5 ft
- KCQF — H L Sonny Callahan
Fairhope · elev 91 ft
- 15A — Mark Reynolds/North Mobile County
Creola · elev 8 ft
- 5R4 — Holk Field At Foley Municipal
Foley · elev 74 ft
- 1R8 — Bay Minette Municipal
Bay Minette · elev 248 ft
Frequently asked questions
How high does density altitude get at 2R5 in summer?
On a typical August afternoon — around 88 °F at the nearest NOAA normals station — density altitude at St Elmo reaches roughly 2,044 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 2R5 on an average day?
It swings with the seasons: from roughly −431 ft at the coldest month's average temperature to about 1,554 ft at the warmest month's — all from a constant field elevation of 132 ft. The month-by-month table above carries the full year.
What is the field elevation of St Elmo?
132 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 2R5 (FAA), in St Elmo, Alabama.