Forest City, Iowa · field elev 1,229 ft
Density Altitude at Forest City Municipal/Trimble Field (KFXY)
Forest City Municipal/Trimble Field sits at 1,229 ft, and even a typical July afternoon (81 °F) only lifts density altitude to about 2,950 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 | 14.1 | −1,559 ft | 22.7 | −939 ft |
| February | 18.3 | −1,254 ft | 27.1 | −627 ft |
| March | 31.4 | −326 ft | 40.4 | 295 ft |
| April | 45.2 | 620 ft | 56.3 | 1,358 ft |
| May | 57.8 | 1,456 ft | 68.5 | 2,147 ft |
| June | 68.0 | 2,115 ft | 78.1 | 2,752 ft |
| July | 71.4 | 2,331 ft | 81.3 | 2,950 ft |
| August | 68.9 | 2,172 ft | 79.0 | 2,808 ft |
| September | 61.5 | 1,697 ft | 73.0 | 2,432 ft |
| October | 48.4 | 835 ft | 59.5 | 1,567 ft |
| November | 33.4 | −187 ft | 42.5 | 438 ft |
| December | 20.7 | −1,082 ft | 28.5 | −529 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 KFXY
DENSITY ALTITUDE
Field elevation 1,229 ft — the air behaves like 2,932 ft.
- PRESSURE ALT
- 1,230 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
- 0Y6 — Lake Mills Municipal
Lake Mills · elev 1,260 ft
- KMCW — Mason City Municipal
Mason City · elev 1,213 ft
- 5D2 — Northwood Municipal
Northwood · elev 1,226 ft
- Y48 — Belmond Municipal
Belmond · elev 1,201 ft
- KAXA — Algona Municipal
Algona · elev 1,216 ft
- KCAV — Clarion Municipal
Clarion · elev 1,157 ft
- KEAG — Eagle Grove Municipal
Eagle Grove · elev 1,132 ft
- KHPT — Hampton Municipal
Hampton · elev 1,176 ft
Frequently asked questions
How high does density altitude get at KFXY in summer?
On a typical July afternoon — around 81 °F at the nearest NOAA normals station — density altitude at Forest City Municipal/Trimble Field reaches roughly 2,950 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 KFXY on an average day?
It swings with the seasons: from roughly −1,559 ft at the coldest month's average temperature to about 2,331 ft at the warmest month's — all from a constant field elevation of 1,229 ft. The month-by-month table above carries the full year.
What is the field elevation of Forest City Municipal/Trimble Field?
1,229 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KFXY (ICAO) / FXY (FAA), in Forest City, Iowa.