Isabel, South Dakota · field elev 2,398 ft
Density Altitude at Isabel Municipal (3Y7)
Isabel Municipal sits at 2,398 ft, and even a typical July afternoon (84 °F) only lifts density altitude to about 4,547 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 | 17.2 | 134 ft | 27.3 | 848 ft |
| February | 20.1 | 341 ft | 30.4 | 1,063 ft |
| March | 31.0 | 1,105 ft | 42.1 | 1,861 ft |
| April | 42.7 | 1,902 ft | 54.7 | 2,695 ft |
| May | 54.3 | 2,669 ft | 66.0 | 3,422 ft |
| June | 64.5 | 3,327 ft | 76.2 | 4,061 ft |
| July | 71.3 | 3,756 ft | 84.1 | 4,547 ft |
| August | 70.0 | 3,675 ft | 83.7 | 4,522 ft |
| September | 60.2 | 3,051 ft | 74.1 | 3,931 ft |
| October | 45.1 | 2,062 ft | 57.6 | 2,884 ft |
| November | 31.4 | 1,132 ft | 42.6 | 1,895 ft |
| December | 20.6 | 377 ft | 30.8 | 1,091 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 3Y7
DENSITY ALTITUDE
Field elevation 2,398 ft — the air behaves like 4,541 ft.
- PRESSURE ALT
- 2,399 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 South Dakota fields
- D58 — Timber Lake Municipal
Timber Lake · elev 2,193 ft
- 84D — Cheyenne Eagle Butte
Eagle Butte · elev 2,449 ft
- D07 — Faith Municipal
Faith · elev 2,584 ft
- 5P2 — Mc Laughlin Municipal
Mc Laughlin · elev 2,008 ft
- KLEM — Lemmon Municipal
Lemmon · elev 2,573 ft
- 6V5 — Bison Municipal
Bison · elev 2,791 ft
- KMBG — Mobridge Municipal
Mobridge · elev 1,716 ft
- 5T4 — Herreid Municipal
Herreid · elev 1,725 ft
Frequently asked questions
How high does density altitude get at 3Y7 in summer?
On a typical July afternoon — around 84 °F at the nearest NOAA normals station — density altitude at Isabel Municipal reaches roughly 4,547 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 3Y7 on an average day?
It swings with the seasons: from roughly 134 ft at the coldest month's average temperature to about 3,756 ft at the warmest month's — all from a constant field elevation of 2,398 ft. The month-by-month table above carries the full year.
What is the field elevation of Isabel Municipal?
2,398 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 3Y7 (FAA), in Isabel, South Dakota.