Alpena, Michigan · field elev 690 ft
Density Altitude at Alpena County Regional (KAPN)
Alpena County Regional sits at 690 ft, and even a typical July afternoon (81 °F) only lifts density altitude to about 2,243 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 | 20.0 | −1,809 ft | 28.1 | −1,231 ft |
| February | 20.7 | −1,759 ft | 30.2 | −1,083 ft |
| March | 29.3 | −1,146 ft | 39.4 | −444 ft |
| April | 41.2 | −321 ft | 52.2 | 421 ft |
| May | 53.4 | 501 ft | 65.8 | 1,311 ft |
| June | 63.2 | 1,143 ft | 75.9 | 1,955 ft |
| July | 68.2 | 1,466 ft | 80.5 | 2,243 ft |
| August | 66.6 | 1,363 ft | 78.8 | 2,136 ft |
| September | 59.0 | 870 ft | 71.0 | 1,644 ft |
| October | 47.4 | 100 ft | 57.6 | 778 ft |
| November | 36.6 | −637 ft | 44.6 | −89 ft |
| December | 26.6 | −1,337 ft | 33.6 | −845 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 KAPN
DENSITY ALTITUDE
Field elevation 690 ft — the air behaves like 2,274 ft.
- PRESSURE ALT
- 691 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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Frequently asked questions
How high does density altitude get at KAPN in summer?
On a typical July afternoon — around 81 °F at the nearest NOAA normals station — density altitude at Alpena County Regional reaches roughly 2,243 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 KAPN on an average day?
It swings with the seasons: from roughly −1,809 ft at the coldest month's average temperature to about 1,466 ft at the warmest month's — all from a constant field elevation of 690 ft. The month-by-month table above carries the full year.
What is the field elevation of Alpena County Regional?
690 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KAPN (ICAO) / APN (FAA), in Alpena, Michigan.