Ottawa, Ohio · field elev 764 ft
Density Altitude at Putnam County (KOWX)
Putnam County sits at 764 ft, and even a typical July afternoon (84 °F) only lifts density altitude to about 2,556 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 | 26.4 | −1,259 ft | 33.4 | −767 ft |
| February | 29.4 | −1,047 ft | 37.1 | −510 ft |
| March | 38.7 | −400 ft | 47.8 | 218 ft |
| April | 50.4 | 393 ft | 61.2 | 1,105 ft |
| May | 61.9 | 1,150 ft | 72.5 | 1,831 ft |
| June | 70.9 | 1,729 ft | 80.9 | 2,358 ft |
| July | 73.9 | 1,919 ft | 84.1 | 2,556 ft |
| August | 71.9 | 1,792 ft | 82.2 | 2,438 ft |
| September | 65.4 | 1,377 ft | 76.4 | 2,077 ft |
| October | 53.8 | 619 ft | 63.8 | 1,273 ft |
| November | 41.7 | −195 ft | 49.9 | 359 ft |
| December | 31.6 | −892 ft | 38.2 | −434 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 KOWX
DENSITY ALTITUDE
Field elevation 764 ft — the air behaves like 2,550 ft.
- PRESSURE ALT
- 765 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
- R47 — Ruhes
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- 5G7 — Bluffton
Bluffton · elev 851 ft
- 6D7 — Deshler Municipal Landing Strip
Deshler · elev 706 ft
- KFDY — Findlay
Findlay · elev 813 ft
- KAOH — Lima Allen County
Lima · elev 975 ft
- 7W5 — Henry County
Napoleon · elev 683 ft
- 1G0 — Wood County Regional
Bowling Green · elev 673 ft
- KDFI — Defiance Meml
Defiance · elev 707 ft
Frequently asked questions
How high does density altitude get at KOWX in summer?
On a typical July afternoon — around 84 °F at the nearest NOAA normals station — density altitude at Putnam County reaches roughly 2,556 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 KOWX on an average day?
It swings with the seasons: from roughly −1,259 ft at the coldest month's average temperature to about 1,919 ft at the warmest month's — all from a constant field elevation of 764 ft. The month-by-month table above carries the full year.
What is the field elevation of Putnam County?
764 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KOWX (ICAO) / OWX (FAA), in Ottawa, Ohio.