Afton, Oklahoma · field elev 792 ft
Density Altitude at Grand Lake Regional (3O9)
Grand Lake Regional sits at 792 ft, and even a typical July afternoon (91 °F) only lifts density altitude to about 3,031 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 | 35.8 | −565 ft | 48.9 | 327 ft |
| February | 40.2 | −262 ft | 54.2 | 680 ft |
| March | 48.3 | 287 ft | 62.5 | 1,224 ft |
| April | 57.5 | 897 ft | 71.6 | 1,808 ft |
| May | 65.7 | 1,430 ft | 78.5 | 2,242 ft |
| June | 74.2 | 1,972 ft | 86.2 | 2,719 ft |
| July | 79.0 | 2,274 ft | 91.3 | 3,031 ft |
| August | 78.1 | 2,217 ft | 90.8 | 3,000 ft |
| September | 69.8 | 1,693 ft | 83.2 | 2,535 ft |
| October | 58.1 | 937 ft | 73.1 | 1,903 ft |
| November | 47.9 | 260 ft | 61.9 | 1,185 ft |
| December | 39.0 | −345 ft | 52.0 | 534 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 3O9
DENSITY ALTITUDE
Field elevation 792 ft — the air behaves like 3,013 ft.
- PRESSURE ALT
- 793 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 Oklahoma fields
- KGMJ — Grove Regional
Grove · elev 831 ft
- 1K8 — South Grand Lake Regional
Ketchum · elev 783 ft
- H04 — Vinita Municipal
Vinita · elev 695 ft
- OK1 — Stearmans Roost
Vinita · elev 702 ft
- KMIO — Miami Regional
Miami · elev 806 ft
- H71 — Mid-America Industrial
Pryor · elev 622 ft
- KGCM — Claremore Regional
Claremore · elev 733 ft
- O18 — Buzzards Roost
Inola · elev 661 ft
Frequently asked questions
How high does density altitude get at 3O9 in summer?
On a typical July afternoon — around 91 °F at the nearest NOAA normals station — density altitude at Grand Lake Regional reaches roughly 3,031 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 3O9 on an average day?
It swings with the seasons: from roughly −565 ft at the coldest month's average temperature to about 2,274 ft at the warmest month's — all from a constant field elevation of 792 ft. The month-by-month table above carries the full year.
What is the field elevation of Grand Lake Regional?
792 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 3O9 (FAA), in Afton, Oklahoma.