Horsfeld, Alaska · field elev 3,620 ft
Density Altitude at Horsfeld (4Z5)
Horsfeld sits at 3,620 ft, and even a typical July afternoon (66 °F) only lifts density altitude to about 4,913 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 | −4.0 | 122 ft | 2.9 | 634 ft |
| February | 5.7 | 839 ft | 13.7 | 1,417 ft |
| March | 13.1 | 1,374 ft | 23.3 | 2,095 ft |
| April | 30.7 | 2,606 ft | 41.5 | 3,335 ft |
| May | 44.2 | 3,514 ft | 54.4 | 4,181 ft |
| June | 52.6 | 4,064 ft | 64.5 | 4,825 ft |
| July | 55.2 | 4,232 ft | 65.9 | 4,913 ft |
| August | 51.4 | 3,986 ft | 61.3 | 4,622 ft |
| September | 41.0 | 3,301 ft | 50.6 | 3,934 ft |
| October | 24.3 | 2,164 ft | 31.6 | 2,667 ft |
| November | 6.5 | 898 ft | 12.4 | 1,324 ft |
| December | 0.3 | 443 ft | 5.8 | 847 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 4Z5
DENSITY ALTITUDE
Field elevation 3,620 ft — the air behaves like 4,919 ft.
- PRESSURE ALT
- 3,622 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 Alaska fields
- CZN — Chisana
Chisana · elev 3,348 ft
- KGZ — Glacier Creek
Glacier Creek · elev 2,380 ft
- MYK — May Creek
May Creek · elev 1,681 ft
- PAMX — Mccarthy
Mccarthy · elev 1,533 ft
- PAOR — Northway
Northway · elev 1,720 ft
- AK0 — Jakes Bar
Mccarthy · elev 1,074 ft
- 3T4 — Tetlin
Tetlin · elev 1,671 ft
- PFTO — Tok Junction
Tok · elev 1,643 ft
Frequently asked questions
How high does density altitude get at 4Z5 in summer?
On a typical July afternoon — around 66 °F at the nearest NOAA normals station — density altitude at Horsfeld reaches roughly 4,913 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 4Z5 on an average day?
It swings with the seasons: from roughly 122 ft at the coldest month's average temperature to about 4,232 ft at the warmest month's — all from a constant field elevation of 3,620 ft. The month-by-month table above carries the full year.
What is the field elevation of Horsfeld?
3,620 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 4Z5 (FAA), in Horsfeld, Alaska.