Decatur, Arkansas · field elev 1,178 ft
Density Altitude at Crystal Lake (5M5)
Crystal Lake sits at 1,178 ft, and even a typical July afternoon (93 °F) only lifts density altitude to about 3,573 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 | 38.7 | 115 ft | 48.8 | 798 ft |
| February | 43.2 | 422 ft | 53.9 | 1,137 ft |
| March | 52.1 | 1,018 ft | 63.4 | 1,757 ft |
| April | 60.7 | 1,582 ft | 72.5 | 2,338 ft |
| May | 68.5 | 2,084 ft | 79.5 | 2,776 ft |
| June | 76.6 | 2,596 ft | 87.4 | 3,263 ft |
| July | 80.9 | 2,863 ft | 92.5 | 3,573 ft |
| August | 80.0 | 2,808 ft | 92.1 | 3,548 ft |
| September | 72.3 | 2,325 ft | 84.2 | 3,067 ft |
| October | 61.4 | 1,628 ft | 72.9 | 2,363 ft |
| November | 50.3 | 899 ft | 60.7 | 1,582 ft |
| December | 41.5 | 306 ft | 51.1 | 952 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 5M5
DENSITY ALTITUDE
Field elevation 1,178 ft — the air behaves like 3,603 ft.
- PRESSURE ALT
- 1,179 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 Arkansas fields
- KXNA — Northwest Arkansas Ntl
Fayetteville/Springdale/Rogers · elev 1,288 ft
- KSLG — Smith Field
Siloam Springs · elev 1,191 ft
- KVBT — Bentonville Municipal/Louise M Thaden Field
Bentonville · elev 1,298 ft
- KROG — Rogers Exec - Carter Field
Rogers · elev 1,359 ft
- KASG — Springdale Municipal
Springdale · elev 1,353 ft
- KFYV — Drake Field
Fayetteville · elev 1,252 ft
- H34 — Huntsville Municipal
Huntsville · elev 1,748 ft
- 4M1 — Carroll County
Berryville · elev 1,206 ft
Frequently asked questions
How high does density altitude get at 5M5 in summer?
On a typical July afternoon — around 93 °F at the nearest NOAA normals station — density altitude at Crystal Lake reaches roughly 3,573 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 5M5 on an average day?
It swings with the seasons: from roughly 115 ft at the coldest month's average temperature to about 2,863 ft at the warmest month's — all from a constant field elevation of 1,178 ft. The month-by-month table above carries the full year.
What is the field elevation of Crystal Lake?
1,178 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 5M5 (FAA), in Decatur, Arkansas.