Portland, Maine · field elev 76 ft
Density Altitude at Portland International Jetport (KPWM)
Portland International Jetport sits at 76 ft, and even a typical July afternoon (80 °F) only lifts density altitude to about 1,429 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 | 24.0 | −2,292 ft | 32.4 | −1,696 ft |
| February | 26.2 | −2,135 ft | 35.0 | −1,514 ft |
| March | 34.1 | −1,577 ft | 42.3 | −1,009 ft |
| April | 44.6 | −852 ft | 53.8 | −232 ft |
| May | 54.9 | −159 ft | 64.2 | 452 ft |
| June | 64.3 | 459 ft | 73.6 | 1,057 ft |
| July | 70.4 | 852 ft | 79.5 | 1,429 ft |
| August | 69.2 | 775 ft | 78.7 | 1,379 ft |
| September | 61.6 | 283 ft | 71.1 | 897 ft |
| October | 50.3 | −467 ft | 59.5 | 145 ft |
| November | 40.0 | −1,167 ft | 48.4 | −595 ft |
| December | 30.3 | −1,844 ft | 38.3 | −1,285 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 KPWM
DENSITY ALTITUDE
Field elevation 76 ft — the air behaves like 1,461 ft.
- PRESSURE ALT
- 77 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 Maine fields
- 98M — Greaton Airfield
Saco · elev 170 ft
- B19 — Biddeford Municipal
Biddeford · elev 157 ft
- 63B — Limington-Harmon
Limington · elev 292 ft
- KBXM — Brunswick Exec
Brunswick · elev 75 ft
- KSFM — Sanford Seacoast Regional
Sanford · elev 244 ft
- KLEW — Auburn/Lewiston Municipal
Auburn/Lewiston · elev 288 ft
- 08B — Merrymeeting Field
Bowdoinham · elev 61 ft
- 81B — Oxford County Regional
Oxford · elev 345 ft
Frequently asked questions
How high does density altitude get at KPWM in summer?
On a typical July afternoon — around 80 °F at the nearest NOAA normals station — density altitude at Portland International Jetport reaches roughly 1,429 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 KPWM on an average day?
It swings with the seasons: from roughly −2,292 ft at the coldest month's average temperature to about 852 ft at the warmest month's — all from a constant field elevation of 76 ft. The month-by-month table above carries the full year.
What is the field elevation of Portland International Jetport?
76 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KPWM (ICAO) / PWM (FAA), in Portland, Maine.