Tremont City, Ohio · field elev 958 ft
Density Altitude at Mad River Airpark (I54)
Mad River Airpark sits at 958 ft, and even a typical July afternoon (84 °F) only lifts density altitude to about 2,780 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 | 27.2 | −959 ft | 35.9 | −351 ft |
| February | 29.9 | −769 ft | 39.5 | −104 ft |
| March | 39.0 | −138 ft | 49.6 | 579 ft |
| April | 50.4 | 633 ft | 62.6 | 1,435 ft |
| May | 61.0 | 1,331 ft | 72.6 | 2,075 ft |
| June | 70.0 | 1,910 ft | 81.2 | 2,613 ft |
| July | 72.9 | 2,094 ft | 83.9 | 2,780 ft |
| August | 71.4 | 1,999 ft | 83.1 | 2,731 ft |
| September | 64.9 | 1,583 ft | 77.7 | 2,395 ft |
| October | 53.3 | 826 ft | 65.3 | 1,609 ft |
| November | 41.6 | 40 ft | 51.8 | 726 ft |
| December | 32.5 | −587 ft | 40.7 | −22 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 I54
DENSITY ALTITUDE
Field elevation 958 ft — the air behaves like 2,786 ft.
- PRESSURE ALT
- 959 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 Ohio fields
- I74 — Grimes Field
Urbana · elev 1,068 ft
- 38I — Cook
Urbana · elev 1,150 ft
- KSGH — Springfield/Beckley Municipal
Springfield · elev 1,051 ft
- 1WF — Waco Field
Troy · elev 817 ft
- KUYF — Madison County
London · elev 1,082 ft
- KDAY — James M Cox Dayton International
Dayton · elev 1,009 ft
- KSCA — Sidney Municipal
Sidney · elev 1,044 ft
- KEDJ — Bellefontaine Regional
Bellefontaine · elev 1,122 ft
Frequently asked questions
How high does density altitude get at I54 in summer?
On a typical July afternoon — around 84 °F at the nearest NOAA normals station — density altitude at Mad River Airpark reaches roughly 2,780 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 I54 on an average day?
It swings with the seasons: from roughly −959 ft at the coldest month's average temperature to about 2,094 ft at the warmest month's — all from a constant field elevation of 958 ft. The month-by-month table above carries the full year.
What is the field elevation of Mad River Airpark?
958 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is I54 (FAA), in Tremont City, Ohio.