Coshocton, Ohio · field elev 979 ft
Density Altitude at Richard Downing (I40)
Richard Downing sits at 979 ft, and even a typical July afternoon (83 °F) only lifts density altitude to about 2,744 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 | 27.7 | −898 ft | 35.5 | −353 ft |
| February | 30.1 | −729 ft | 38.3 | −160 ft |
| March | 39.0 | −112 ft | 48.1 | 505 ft |
| April | 51.3 | 719 ft | 61.2 | 1,370 ft |
| May | 61.4 | 1,383 ft | 70.9 | 1,993 ft |
| June | 69.8 | 1,923 ft | 79.4 | 2,527 ft |
| July | 73.3 | 2,145 ft | 82.9 | 2,744 ft |
| August | 72.1 | 2,069 ft | 81.8 | 2,676 ft |
| September | 65.7 | 1,660 ft | 75.6 | 2,289 ft |
| October | 53.9 | 891 ft | 63.5 | 1,519 ft |
| November | 42.4 | 120 ft | 50.6 | 672 ft |
| December | 32.8 | −540 ft | 39.8 | −57 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 I40
DENSITY ALTITUDE
Field elevation 979 ft — the air behaves like 2,750 ft.
- PRESSURE ALT
- 980 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
- 80G — Tri-City
West Lafayette · elev 844 ft
- 10G — Holmes County
Millersburg · elev 1,227 ft
- 42I — Parr
Zanesville · elev 790 ft
- KPHD — Harry Clever Field
New Philadelphia · elev 894 ft
- KZZV — Zanesville Municipal
Zanesville · elev 900 ft
- KCDI — Cambridge Municipal
Cambridge · elev 799 ft
- 2D7 — Beach City
Beach City · elev 984 ft
- 6G4 — Wynkoop
Mount Vernon · elev 1,041 ft
Frequently asked questions
How high does density altitude get at I40 in summer?
On a typical July afternoon — around 83 °F at the nearest NOAA normals station — density altitude at Richard Downing reaches roughly 2,744 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 I40 on an average day?
It swings with the seasons: from roughly −898 ft at the coldest month's average temperature to about 2,145 ft at the warmest month's — all from a constant field elevation of 979 ft. The month-by-month table above carries the full year.
What is the field elevation of Richard Downing?
979 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is I40 (FAA), in Coshocton, Ohio.