Winchester, Idaho · field elev 1,415 ft
Density Altitude at Wapshilla (I45)
Wapshilla sits at 1,415 ft, and even a typical July afternoon (91 °F) only lifts density altitude to about 3,758 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 | 36.2 | 239 ft | 42.1 | 641 ft |
| February | 39.3 | 451 ft | 47.0 | 972 ft |
| March | 45.4 | 864 ft | 55.1 | 1,509 ft |
| April | 51.5 | 1,271 ft | 62.3 | 1,978 ft |
| May | 60.0 | 1,829 ft | 72.0 | 2,597 ft |
| June | 66.5 | 2,247 ft | 79.0 | 3,035 ft |
| July | 75.8 | 2,835 ft | 90.8 | 3,758 ft |
| August | 75.2 | 2,798 ft | 90.1 | 3,715 ft |
| September | 65.9 | 2,209 ft | 79.5 | 3,066 ft |
| October | 52.5 | 1,338 ft | 63.0 | 2,023 ft |
| November | 41.6 | 608 ft | 48.7 | 1,085 ft |
| December | 35.2 | 170 ft | 40.8 | 553 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 I45
DENSITY ALTITUDE
Field elevation 1,415 ft — the air behaves like 3,770 ft.
- PRESSURE ALT
- 1,416 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
- S84 — Cottonwood Municipal
Cottonwood · elev 3,474 ft
- S89 — Craigmont Municipal
Craigmont · elev 3,805 ft
- 1S7 — Slate Creek
Slate Creek · elev 1,660 ft
- 1DA — Big Bar Usfs
Lucile · elev 1,236 ft
- KGIC — Idaho County
Grangeville · elev 3,313 ft
- KLWS — Lewiston/Nez Perce County
Lewiston · elev 1,442 ft
- 0S5 — Nezperce Municipal
Nezperce · elev 3,204 ft
- S82 — Kooskia Municipal
Kooskia · elev 1,263 ft
Frequently asked questions
How high does density altitude get at I45 in summer?
On a typical July afternoon — around 91 °F at the nearest NOAA normals station — density altitude at Wapshilla reaches roughly 3,758 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 I45 on an average day?
It swings with the seasons: from roughly 170 ft at the coldest month's average temperature to about 2,835 ft at the warmest month's — all from a constant field elevation of 1,415 ft. The month-by-month table above carries the full year.
What is the field elevation of Wapshilla?
1,415 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is I45 (FAA), in Winchester, Idaho.