Yellow Pine, Idaho · field elev 4,960 ft
Density Altitude at Johnson Creek (3U2)
From a field elevation of 4,960 ft, a typical July afternoon at Johnson Creek (87 °F) raises density altitude to about 7,805 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 | 24.2 | 3,828 ft | 36.1 | 4,634 ft |
| February | 28.2 | 4,101 ft | 40.4 | 4,919 ft |
| March | 34.6 | 4,533 ft | 46.3 | 5,306 ft ▲ |
| April | 42.3 | 5,044 ft | 55.7 | 5,910 ft ▲ |
| May | 49.7 | 5,526 ft | 64.1 | 6,439 ft ▲ |
| June | 57.7 | 6,037 ft | 73.9 | 7,043 ft ▲ |
| July | 65.8 | 6,545 ft | 86.6 | 7,805 ft ▲ |
| August | 65.5 | 6,526 ft | 86.5 | 7,799 ft ▲ |
| September | 56.8 | 5,980 ft | 76.4 | 7,195 ft ▲ |
| October | 44.7 | 5,201 ft | 59.4 | 6,144 ft ▲ |
| November | 32.5 | 4,392 ft | 43.0 | 5,090 ft ▲ |
| December | 24.1 | 3,821 ft | 33.6 | 4,466 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 3U2
DENSITY ALTITUDE caution
Field elevation 4,960 ft — the air behaves like 7,829 ft.
- PRESSURE ALT
- 4,962 ft
- ISA DEVIATION
- —
- RULE-OF-THUMB DA
- —
- AIR DENSITY INDEX
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- AIR DENSITY
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- 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 Idaho fields
- I92 — Reed Ranch
Yellow Pine · elev 4,157 ft
- 24K — Krassel Usfs
Mc Call · elev 3,982 ft
- U60 — Big Creek
Big Creek · elev 5,743 ft
- 0U0 — Landmark Usfs
Landmark · elev 6,662 ft
- S81 — Indian Creek Usfs
Indian Creek · elev 4,718 ft
- ID8 — Marble Creek
Challis · elev 4,685 ft
- 3U1 — Warren /Usfs/
Warren · elev 5,902 ft
- 2U8 — Thomas Creek
Stanley · elev 4,415 ft
Frequently asked questions
How high does density altitude get at 3U2 in summer?
On a typical July afternoon — around 87 °F at the nearest NOAA normals station — density altitude at Johnson Creek reaches roughly 7,805 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 3U2 on an average day?
It swings with the seasons: from roughly 3,821 ft at the coldest month's average temperature to about 6,545 ft at the warmest month's — all from a constant field elevation of 4,960 ft. The month-by-month table above carries the full year.
What is the field elevation of Johnson Creek?
4,960 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 3U2 (FAA), in Yellow Pine, Idaho.