Joseph, Oregon · field elev 4,126 ft
Density Altitude at Joseph State (KJSY)
From a field elevation of 4,126 ft, a typical August afternoon at Joseph State (80 °F) raises density altitude to about 6,381 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 | 26.9 | 2,975 ft | 34.9 | 3,520 ft |
| February | 29.2 | 3,133 ft | 39.1 | 3,801 ft |
| March | 36.3 | 3,614 ft | 46.3 | 4,277 ft |
| April | 41.1 | 3,934 ft | 51.8 | 4,635 ft |
| May | 49.7 | 4,499 ft | 61.0 | 5,224 ft ▲ |
| June | 56.3 | 4,925 ft | 68.4 | 5,688 ft ▲ |
| July | 64.0 | 5,413 ft | 79.3 | 6,357 ft ▲ |
| August | 64.5 | 5,444 ft | 79.7 | 6,381 ft ▲ |
| September | 57.0 | 4,969 ft | 70.6 | 5,824 ft ▲ |
| October | 45.0 | 4,192 ft | 56.1 | 4,912 ft |
| November | 33.9 | 3,452 ft | 42.7 | 4,040 ft |
| December | 26.2 | 2,927 ft | 34.7 | 3,506 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 KJSY
DENSITY ALTITUDE caution
Field elevation 4,126 ft — the air behaves like 6,399 ft.
- PRESSURE ALT
- 4,128 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
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Imnaha · elev 1,370 ft
- KLGD — La Grande/Union County
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- OR9 — Lord Flat Usfs
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- O48 — Salmon Bar
Imnaha · elev 947 ft
Frequently asked questions
How high does density altitude get at KJSY in summer?
On a typical August afternoon — around 80 °F at the nearest NOAA normals station — density altitude at Joseph State reaches roughly 6,381 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 KJSY on an average day?
It swings with the seasons: from roughly 2,927 ft at the coldest month's average temperature to about 5,444 ft at the warmest month's — all from a constant field elevation of 4,126 ft. The month-by-month table above carries the full year.
What is the field elevation of Joseph State?
4,126 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KJSY (ICAO) / JSY (FAA), in Joseph, Oregon.