Murphy, Idaho · field elev 2,855 ft
Density Altitude at Murphy (1U3)
From a field elevation of 2,855 ft, a typical July afternoon at Murphy (95 °F) raises density altitude to about 5,731 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 | 33.6 | 1,853 ft | 41.6 | 2,394 ft |
| February | 39.1 | 2,226 ft | 49.0 | 2,886 ft |
| March | 47.3 | 2,773 ft | 58.7 | 3,517 ft |
| April | 53.4 | 3,174 ft | 65.6 | 3,957 ft |
| May | 62.4 | 3,754 ft | 75.2 | 4,557 ft |
| June | 70.6 | 4,271 ft | 84.1 | 5,102 ft ▲ |
| July | 79.8 | 4,840 ft | 94.6 | 5,731 ft ▲ |
| August | 77.9 | 4,724 ft | 93.3 | 5,654 ft ▲ |
| September | 68.0 | 4,108 ft | 83.1 | 5,042 ft ▲ |
| October | 55.0 | 3,278 ft | 68.2 | 4,121 ft |
| November | 41.6 | 2,394 ft | 52.0 | 3,082 ft |
| December | 33.7 | 1,859 ft | 41.7 | 2,401 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 1U3
DENSITY ALTITUDE caution
Field elevation 2,855 ft — the air behaves like 5,755 ft.
- PRESSURE ALT
- 2,857 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 Idaho fields
- KMAN — Nampa Municipal
Nampa · elev 2,537 ft
- KBOI — Boise Air Trml/Gowen Field
Boise · elev 2,872 ft
- KEUL — Caldwell Exec
Caldwell · elev 2,431 ft
- S66 — Homedale Municipal
Homedale · elev 2,220 ft
- U76 — Mountain Home Municipal
Mountain Home · elev 3,167 ft
- 50S — Parma
Parma · elev 2,228 ft
- S78 — Emmett Municipal
Emmett · elev 2,354 ft
- 2U0 — Smith Prairie
Prairie · elev 4,958 ft
Frequently asked questions
How high does density altitude get at 1U3 in summer?
On a typical July afternoon — around 95 °F at the nearest NOAA normals station — density altitude at Murphy reaches roughly 5,731 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 1U3 on an average day?
It swings with the seasons: from roughly 1,853 ft at the coldest month's average temperature to about 4,840 ft at the warmest month's — all from a constant field elevation of 2,855 ft. The month-by-month table above carries the full year.
What is the field elevation of Murphy?
2,855 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 1U3 (FAA), in Murphy, Idaho.