John Day, Oregon · field elev 3,703 ft
Density Altitude at Grant County Regional/Ogilvie Field (KGCD)
From a field elevation of 3,703 ft, a typical July afternoon at Grant County Regional/Ogilvie Field (86 °F) raises density altitude to about 6,259 ft — solidly into the range where performance charts deserve a close read.
Typical density altitude by month
| Month | Avg temp °F | DA at avg temp | Afternoon high °F | DA on a typical afternoon |
|---|---|---|---|---|
| January | 30.8 | 2,716 ft | 40.3 | 3,358 ft |
| February | 33.7 | 2,913 ft | 44.8 | 3,656 ft |
| March | 38.9 | 3,264 ft | 51.5 | 4,095 ft |
| April | 43.8 | 3,590 ft | 57.3 | 4,469 ft |
| May | 51.8 | 4,114 ft | 66.4 | 5,046 ft ▲ |
| June | 58.6 | 4,552 ft | 74.5 | 5,549 ft ▲ |
| July | 67.0 | 5,083 ft | 86.2 | 6,259 ft ▲ |
| August | 65.9 | 5,014 ft | 85.8 | 6,235 ft ▲ |
| September | 57.9 | 4,507 ft | 76.7 | 5,684 ft ▲ |
| October | 46.7 | 3,781 ft | 62.2 | 4,781 ft |
| November | 36.6 | 3,109 ft | 47.5 | 3,834 ft |
| December | 29.9 | 2,654 ft | 39.0 | 3,271 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 KGCD
DENSITY ALTITUDE caution
Field elevation 3,703 ft — the air behaves like 6,247 ft.
- PRESSURE ALT
- 3,705 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 Oregon fields
- 12S — Monument Municipal
Monument · elev 2,323 ft
- KBNO — Burns Municipal
Burns · elev 4,148 ft
- KBKE — Baker City Municipal
Baker City · elev 3,373 ft
- KLGD — La Grande/Union County
La Grande · elev 2,718 ft
- 9S9 — Lexington
Lexington · elev 1,635 ft
- 3S9 — Condon State Pauling Field
Condon · elev 2,911 ft
- KPDT — Eastern Oregon Regional At Pendleton
Pendleton · elev 1,494 ft
- S49 — Miller Meml Airpark
Vale · elev 2,249 ft
Frequently asked questions
How high does density altitude get at KGCD in summer?
On a typical July afternoon — around 86 °F at the nearest NOAA normals station — density altitude at Grant County Regional/Ogilvie Field reaches roughly 6,259 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 KGCD on an average day?
It swings with the seasons: from roughly 2,654 ft at the coldest month's average temperature to about 5,083 ft at the warmest month's — all from a constant field elevation of 3,703 ft. The month-by-month table above carries the full year.
What is the field elevation of Grant County Regional/Ogilvie Field?
3,703 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KGCD (ICAO) / GCD (FAA), in John Day, Oregon.