Saco, Maine · field elev 170 ft
Density Altitude at Greaton Airfield (98M)
Greaton Airfield sits at 170 ft, and even a typical July afternoon (82 °F) only lifts density altitude to about 1,676 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 | 19.8 | −2,477 ft | 31.4 | −1,649 ft |
| February | 22.0 | −2,318 ft | 34.4 | −1,439 ft |
| March | 31.8 | −1,621 ft | 43.3 | −824 ft |
| April | 43.3 | −824 ft | 55.7 | 10 ft |
| May | 54.9 | −43 ft | 67.2 | 762 ft |
| June | 64.3 | 574 ft | 76.3 | 1,343 ft |
| July | 69.9 | 936 ft | 81.6 | 1,676 ft |
| August | 68.4 | 839 ft | 80.5 | 1,607 ft |
| September | 60.4 | 320 ft | 72.5 | 1,102 ft |
| October | 48.1 | −498 ft | 59.8 | 281 ft |
| November | 37.0 | −1,258 ft | 47.9 | −512 ft |
| December | 26.7 | −1,982 ft | 36.9 | −1,265 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 98M
DENSITY ALTITUDE
Field elevation 170 ft — the air behaves like 1,700 ft.
- PRESSURE ALT
- 171 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
- B19 — Biddeford Municipal
Biddeford · elev 157 ft
- KPWM — Portland International Jetport
Portland · elev 76 ft
- 63B — Limington-Harmon
Limington · elev 292 ft
- KSFM — Sanford Seacoast Regional
Sanford · elev 244 ft
- KLEW — Auburn/Lewiston Municipal
Auburn/Lewiston · elev 288 ft
- KIZG — White Mountain Regional
Fryeburg · elev 455 ft
- KBXM — Brunswick Exec
Brunswick · elev 75 ft
- 81B — Oxford County Regional
Oxford · elev 345 ft
Frequently asked questions
How high does density altitude get at 98M in summer?
On a typical July afternoon — around 82 °F at the nearest NOAA normals station — density altitude at Greaton Airfield reaches roughly 1,676 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 98M on an average day?
It swings with the seasons: from roughly −2,477 ft at the coldest month's average temperature to about 936 ft at the warmest month's — all from a constant field elevation of 170 ft. The month-by-month table above carries the full year.
What is the field elevation of Greaton Airfield?
170 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 98M (FAA), in Saco, Maine.