Crystal Springs, Mississippi · field elev 435 ft
Density Altitude at Copiah County (M11)
Copiah County sits at 435 ft, and even a typical August afternoon (92 °F) only lifts density altitude to about 2,657 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 | 47.4 | −217 ft | 58.1 | 496 ft |
| February | 51.3 | 45 ft | 62.6 | 790 ft |
| March | 57.9 | 483 ft | 69.5 | 1,236 ft |
| April | 64.9 | 940 ft | 76.4 | 1,674 ft |
| May | 72.7 | 1,440 ft | 83.7 | 2,130 ft |
| June | 79.3 | 1,856 ft | 89.9 | 2,511 ft |
| July | 81.7 | 2,006 ft | 92.2 | 2,651 ft |
| August | 81.5 | 1,993 ft | 92.3 | 2,657 ft |
| September | 76.8 | 1,699 ft | 87.8 | 2,383 ft |
| October | 66.7 | 1,056 ft | 79.3 | 1,856 ft |
| November | 56.4 | 384 ft | 68.3 | 1,159 ft |
| December | 49.9 | −48 ft | 60.8 | 673 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 M11
DENSITY ALTITUDE
Field elevation 435 ft — the air behaves like 2,639 ft.
- PRESSURE ALT
- 436 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 Mississippi fields
- 1R7 — Brookhaven-Lincoln County
Brookhaven · elev 492 ft
- KJVW — John Bell Williams
Raymond · elev 247 ft
- KHKS — Hawkins Field
Jackson · elev 341 ft
- KJAN — Jackson-Medgar Wiley Evers International
Jackson · elev 346 ft
- 17M — Magee Municipal
Magee · elev 556 ft
- M43 — Prentiss-Jefferson Davis County
Prentiss · elev 455 ft
- KMBO — Bruce Campbell Field
Madison · elev 325 ft
- KVKS — Vicksburg Municipal
Vicksburg · elev 107 ft
Frequently asked questions
How high does density altitude get at M11 in summer?
On a typical August afternoon — around 92 °F at the nearest NOAA normals station — density altitude at Copiah County reaches roughly 2,657 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 M11 on an average day?
It swings with the seasons: from roughly −217 ft at the coldest month's average temperature to about 2,006 ft at the warmest month's — all from a constant field elevation of 435 ft. The month-by-month table above carries the full year.
What is the field elevation of Copiah County?
435 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is M11 (FAA), in Crystal Springs, Mississippi.