Bethel, Pennsylvania · field elev 582 ft
Density Altitude at Grimes (8N1)
Grimes sits at 582 ft, and even a typical July afternoon (84 °F) only lifts density altitude to about 2,353 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 | 29.5 | −1,267 ft | 37.0 | −744 ft |
| February | 31.9 | −1,099 ft | 40.4 | −510 ft |
| March | 40.1 | −531 ft | 49.4 | 100 ft |
| April | 51.1 | 214 ft | 62.0 | 933 ft |
| May | 61.2 | 880 ft | 71.9 | 1,569 ft |
| June | 69.9 | 1,442 ft | 80.0 | 2,079 ft |
| July | 74.3 | 1,721 ft | 84.4 | 2,353 ft |
| August | 72.5 | 1,607 ft | 82.4 | 2,229 ft |
| September | 65.5 | 1,159 ft | 75.6 | 1,803 ft |
| October | 54.0 | 407 ft | 64.1 | 1,069 ft |
| November | 43.2 | −319 ft | 52.3 | 294 ft |
| December | 34.3 | −931 ft | 41.7 | −421 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 8N1
DENSITY ALTITUDE
Field elevation 582 ft — the air behaves like 2,328 ft.
- PRESSURE ALT
- 583 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 Pennsylvania fields
- 9N7 — Farmers Pride
Fredericksburg · elev 495 ft
- 9D4 — Deck
Myerstown · elev 523 ft
- 08N — Keller Brothers
Lebanon · elev 550 ft
- 74N — Bendigo
Tower City · elev 791 ft
- KZER — Schuylkill County/Joe Zerbey
Pottsville · elev 1,730 ft
- KRDG — Reading Regional/Carl A Spaatz Field
Reading · elev 343 ft
- 58N — Reigle Field
Palmyra · elev 489 ft
- KLNS — Lancaster
Lancaster · elev 403 ft
Frequently asked questions
How high does density altitude get at 8N1 in summer?
On a typical July afternoon — around 84 °F at the nearest NOAA normals station — density altitude at Grimes reaches roughly 2,353 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 8N1 on an average day?
It swings with the seasons: from roughly −1,267 ft at the coldest month's average temperature to about 1,721 ft at the warmest month's — all from a constant field elevation of 582 ft. The month-by-month table above carries the full year.
What is the field elevation of Grimes?
582 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 8N1 (FAA), in Bethel, Pennsylvania.