Pell City, Alabama · field elev 485 ft
Density Altitude at St Clair County (KPLR)
St Clair County sits at 485 ft, and even a typical July afternoon (90 °F) only lifts density altitude to about 2,578 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 | 43.5 | −419 ft | 54.1 | 294 ft |
| February | 47.5 | −148 ft | 59.2 | 630 ft |
| March | 54.6 | 327 ft | 66.4 | 1,098 ft |
| April | 61.6 | 787 ft | 74.6 | 1,621 ft |
| May | 69.4 | 1,291 ft | 81.1 | 2,029 ft |
| June | 77.0 | 1,773 ft | 87.5 | 2,425 ft |
| July | 80.0 | 1,961 ft | 90.0 | 2,578 ft |
| August | 79.1 | 1,904 ft | 89.6 | 2,554 ft |
| September | 73.8 | 1,571 ft | 85.1 | 2,277 ft |
| October | 63.0 | 878 ft | 75.8 | 1,697 ft |
| November | 51.6 | 127 ft | 64.3 | 962 ft |
| December | 46.0 | −249 ft | 56.8 | 472 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 KPLR
DENSITY ALTITUDE
Field elevation 485 ft — the air behaves like 2,578 ft.
- PRESSURE ALT
- 486 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 Alabama fields
- KASN — Talladega Municipal
Talladega · elev 529 ft
- KANB — Anniston Regional
Anniston · elev 612 ft
- KSCD — Merkel Field Sylacauga Municipal
Sylacauga · elev 569 ft
- KBHM — Birmingham-Shuttlesworth International
Birmingham · elev 650 ft
- 20A — Robbins Field
Oneonta · elev 1,125 ft
- KGAD — Northeast Alabama Regional
Gadsden · elev 569 ft
- 26A — Ashland/Lineville
Ashland/Lineville · elev 1,065 ft
- KEET — Shelby County
Alabaster · elev 586 ft
Frequently asked questions
How high does density altitude get at KPLR in summer?
On a typical July afternoon — around 90 °F at the nearest NOAA normals station — density altitude at St Clair County reaches roughly 2,578 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 KPLR on an average day?
It swings with the seasons: from roughly −419 ft at the coldest month's average temperature to about 1,961 ft at the warmest month's — all from a constant field elevation of 485 ft. The month-by-month table above carries the full year.
What is the field elevation of St Clair County?
485 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KPLR (ICAO) / PLR (FAA), in Pell City, Alabama.