Arlington, South Dakota · field elev 1,818 ft
Density Altitude at Arlington Municipal (3A9)
Arlington Municipal sits at 1,818 ft, and even a typical July afternoon (83 °F) only lifts density altitude to about 3,755 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 | 14.5 | −789 ft | 23.7 | −130 ft |
| February | 19.1 | −457 ft | 28.7 | 221 ft |
| March | 31.2 | 395 ft | 41.2 | 1,081 ft |
| April | 44.9 | 1,330 ft | 56.8 | 2,117 ft |
| May | 57.6 | 2,169 ft | 69.2 | 2,914 ft |
| June | 67.5 | 2,806 ft | 78.3 | 3,484 ft |
| July | 71.7 | 3,071 ft | 82.7 | 3,755 ft |
| August | 69.5 | 2,933 ft | 80.4 | 3,613 ft |
| September | 61.4 | 2,415 ft | 72.9 | 3,147 ft |
| October | 47.3 | 1,491 ft | 58.1 | 2,202 ft |
| November | 32.3 | 472 ft | 41.6 | 1,108 ft |
| December | 19.6 | −422 ft | 28.0 | 172 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 3A9
DENSITY ALTITUDE
Field elevation 1,818 ft — the air behaves like 3,773 ft.
- PRESSURE ALT
- 1,819 ft
- ISA DEVIATION
- —
- RULE-OF-THUMB DA
- —
- AIR DENSITY INDEX
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- AIR DENSITY
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- WATER · GRAINS/LB
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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
- KBKX — Brookings Regional
Brookings · elev 1,648 ft
- 6E5 — Wilder
Desmet · elev 1,730 ft
- KMDS — Madison Municipal
Madison · elev 1,718 ft
- 8D9 — Howard Municipal
Howard · elev 1,586 ft
- KATY — Watertown Regional
Watertown · elev 1,749 ft
- 4P3 — Flandreau Municipal
Flandreau · elev 1,645 ft
- 8D7 — Clark County
Clark · elev 1,793 ft
- KHON — Huron Regional
Huron · elev 1,289 ft
Frequently asked questions
How high does density altitude get at 3A9 in summer?
On a typical July afternoon — around 83 °F at the nearest NOAA normals station — density altitude at Arlington Municipal reaches roughly 3,755 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 3A9 on an average day?
It swings with the seasons: from roughly −789 ft at the coldest month's average temperature to about 3,071 ft at the warmest month's — all from a constant field elevation of 1,818 ft. The month-by-month table above carries the full year.
What is the field elevation of Arlington Municipal?
1,818 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 3A9 (FAA), in Arlington, South Dakota.