Marshalltown, Iowa · field elev 975 ft
Density Altitude at Marshalltown Municipal (KMIW)
Marshalltown Municipal sits at 975 ft, and even a typical July afternoon (83 °F) only lifts density altitude to about 2,752 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 | 18.9 | −1,530 ft | 27.7 | −903 ft |
| February | 23.2 | −1,222 ft | 32.4 | −573 ft |
| March | 35.7 | −344 ft | 45.9 | 352 ft |
| April | 48.3 | 514 ft | 60.0 | 1,287 ft |
| May | 60.0 | 1,287 ft | 71.2 | 2,007 ft |
| June | 69.7 | 1,911 ft | 80.6 | 2,597 ft |
| July | 72.6 | 2,095 ft | 83.1 | 2,752 ft |
| August | 70.2 | 1,943 ft | 81.0 | 2,622 ft |
| September | 62.8 | 1,468 ft | 75.1 | 2,253 ft |
| October | 50.2 | 641 ft | 61.8 | 1,404 ft |
| November | 36.2 | −309 ft | 46.1 | 366 ft |
| December | 24.3 | −1,143 ft | 33.0 | −531 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 KMIW
DENSITY ALTITUDE
Field elevation 975 ft — the air behaves like 2,746 ft.
- PRESSURE ALT
- 976 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 Iowa fields
- 6K7 — Grundy Center Municipal
Grundy Center · elev 1,075 ft
- 27P — Eldora
Eldora · elev 975 ft
- 8C5 — Toledo Municipal
Toledo · elev 960 ft
- 8C6 — Traer Municipal
Traer · elev 892 ft
- 2Y1 — Drake
Radcliffe · elev 1,179 ft
- KGGI — Grinnell Regional
Grinnell · elev 1,008 ft
- 4C7 — Ackley Municipal
Ackley · elev 1,070 ft
- KIFA — Iowa Falls Municipal
Iowa Falls · elev 1,137 ft
Frequently asked questions
How high does density altitude get at KMIW in summer?
On a typical July afternoon — around 83 °F at the nearest NOAA normals station — density altitude at Marshalltown Municipal reaches roughly 2,752 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 KMIW on an average day?
It swings with the seasons: from roughly −1,530 ft at the coldest month's average temperature to about 2,095 ft at the warmest month's — all from a constant field elevation of 975 ft. The month-by-month table above carries the full year.
What is the field elevation of Marshalltown Municipal?
975 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KMIW (ICAO) / MIW (FAA), in Marshalltown, Iowa.