Harlan, Kentucky · field elev 1,564 ft
Density Altitude at Tucker-Guthrie Meml (I35)
Tucker-Guthrie Meml sits at 1,564 ft, and even a typical July afternoon (85 °F) only lifts density altitude to about 3,586 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 | 35.6 | 383 ft | 45.2 | 1,036 ft |
| February | 38.8 | 602 ft | 49.1 | 1,296 ft |
| March | 46.0 | 1,089 ft | 57.9 | 1,876 ft |
| April | 55.4 | 1,712 ft | 68.4 | 2,551 ft |
| May | 64.0 | 2,270 ft | 75.7 | 3,011 ft |
| June | 71.6 | 2,754 ft | 82.3 | 3,421 ft |
| July | 75.0 | 2,968 ft | 85.0 | 3,586 ft |
| August | 74.1 | 2,911 ft | 84.5 | 3,556 ft |
| September | 68.4 | 2,551 ft | 79.5 | 3,248 ft |
| October | 57.4 | 1,843 ft | 69.7 | 2,634 ft |
| November | 46.0 | 1,089 ft | 57.9 | 1,876 ft |
| December | 39.0 | 616 ft | 48.6 | 1,263 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 I35
DENSITY ALTITUDE
Field elevation 1,564 ft — the air behaves like 3,586 ft.
- PRESSURE ALT
- 1,565 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 Kentucky fields
- 1A6 — Middlesboro/Bell County
Middlesboro · elev 1,154 ft
- KCPF — Wendell H Ford
Hazard · elev 1,257 ft
- KLOZ — London/Corbin/Magee
London · elev 1,212 ft
- KBYL — Williamsburg-Whitley County
Williamsburg · elev 1,178 ft
- KJKL — Julian Carroll
Jackson · elev 1,381 ft
- 18I — Mc Creary County
Pine Knot · elev 1,370 ft
- KPBX — Pike County/Hatcher Field
Pikeville · elev 1,465 ft
- KSME — Lake Cumberland Regional
Somerset · elev 927 ft
Frequently asked questions
How high does density altitude get at I35 in summer?
On a typical July afternoon — around 85 °F at the nearest NOAA normals station — density altitude at Tucker-Guthrie Meml reaches roughly 3,586 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 I35 on an average day?
It swings with the seasons: from roughly 383 ft at the coldest month's average temperature to about 2,968 ft at the warmest month's — all from a constant field elevation of 1,564 ft. The month-by-month table above carries the full year.
What is the field elevation of Tucker-Guthrie Meml?
1,564 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is I35 (FAA), in Harlan, Kentucky.