Grinnell, Iowa · field elev 1,008 ft
Density Altitude at Grinnell Regional (KGGI)
Grinnell Regional sits at 1,008 ft, and even a typical July afternoon (83 °F) only lifts density altitude to about 2,804 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 | 19.3 | −1,460 ft | 28.3 | −819 ft |
| February | 23.3 | −1,173 ft | 33.0 | −490 ft |
| March | 35.4 | −324 ft | 46.1 | 407 ft |
| April | 47.3 | 487 ft | 59.4 | 1,288 ft |
| May | 58.5 | 1,229 ft | 69.9 | 1,965 ft |
| June | 68.6 | 1,882 ft | 79.5 | 2,569 ft |
| July | 72.5 | 2,130 ft | 83.3 | 2,804 ft |
| August | 70.2 | 1,984 ft | 81.2 | 2,674 ft |
| September | 62.7 | 1,503 ft | 75.2 | 2,300 ft |
| October | 50.2 | 681 ft | 62.3 | 1,477 ft |
| November | 36.6 | −241 ft | 46.8 | 454 ft |
| December | 25.2 | −1,038 ft | 34.0 | −421 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 KGGI
DENSITY ALTITUDE
Field elevation 1,008 ft — the air behaves like 2,786 ft.
- PRESSURE ALT
- 1,009 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
- 8C2 — Sully Municipal
Sully · elev 922 ft
- KTNU — Newton Municipal-Earl Johnson Field
Newton · elev 953 ft
- 8C5 — Toledo Municipal
Toledo · elev 960 ft
- KPEA — Pella Municipal
Pella · elev 885 ft
- KTZT — Belle Plaine Municipal
Belle Plaine · elev 771 ft
- KMIW — Marshalltown Municipal
Marshalltown · elev 975 ft
- KOXV — Knoxville Municipal
Knoxville · elev 928 ft
- KOOA — Oskaloosa Municipal
Oskaloosa · elev 840 ft
Frequently asked questions
How high does density altitude get at KGGI in summer?
On a typical July afternoon — around 83 °F at the nearest NOAA normals station — density altitude at Grinnell Regional reaches roughly 2,804 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 KGGI on an average day?
It swings with the seasons: from roughly −1,460 ft at the coldest month's average temperature to about 2,130 ft at the warmest month's — all from a constant field elevation of 1,008 ft. The month-by-month table above carries the full year.
What is the field elevation of Grinnell Regional?
1,008 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KGGI (ICAO) / GGI (FAA), in Grinnell, Iowa.