Waynesville, Ohio · field elev 955 ft
Density Altitude at Red Stewart Airfield (40I)
Red Stewart Airfield sits at 955 ft, and even a typical July afternoon (86 °F) only lifts density altitude to about 2,900 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 | 30.6 | −724 ft | 39.1 | −135 ft |
| February | 33.8 | −501 ft | 43.0 | 131 ft |
| March | 42.6 | 104 ft | 52.6 | 775 ft |
| April | 53.9 | 862 ft | 65.2 | 1,599 ft |
| May | 64.0 | 1,521 ft | 74.8 | 2,210 ft |
| June | 72.2 | 2,046 ft | 82.8 | 2,709 ft |
| July | 75.4 | 2,248 ft | 85.9 | 2,900 ft |
| August | 74.2 | 2,172 ft | 85.1 | 2,851 ft |
| September | 67.4 | 1,740 ft | 78.8 | 2,460 ft |
| October | 55.8 | 987 ft | 66.8 | 1,702 ft |
| November | 44.3 | 219 ft | 53.8 | 855 ft |
| December | 35.1 | −410 ft | 42.9 | 124 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 40I
DENSITY ALTITUDE
Field elevation 955 ft — the air behaves like 2,906 ft.
- PRESSURE ALT
- 956 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
- I68 — Warren County/John Lane Field
Lebanon · elev 898 ft
- KMGY — Dayton/Wright Brothers
Dayton · elev 957 ft
- I73 — Moraine Air Park
Dayton · elev 720 ft
- I66 — Clinton Field
Wilmington · elev 1,033 ft
- KGDK — Greene County/Lewis A Jackson Regional
Dayton · elev 949 ft
- KMWO — Middletown Regional/Hook Field
Middletown · elev 651 ft
- KILN — Wilmington Air Park
Wilmington · elev 1,077 ft
- I44 — Dahio Trotwood
Dayton · elev 925 ft
Frequently asked questions
How high does density altitude get at 40I in summer?
On a typical July afternoon — around 86 °F at the nearest NOAA normals station — density altitude at Red Stewart Airfield reaches roughly 2,900 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 40I on an average day?
It swings with the seasons: from roughly −724 ft at the coldest month's average temperature to about 2,248 ft at the warmest month's — all from a constant field elevation of 955 ft. The month-by-month table above carries the full year.
What is the field elevation of Red Stewart Airfield?
955 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 40I (FAA), in Waynesville, Ohio.