Jacksonville, Texas · field elev 678 ft
Density Altitude at Cherokee County (KJSO)
Cherokee County sits at 678 ft, and even a typical August afternoon (92 °F) only lifts density altitude to about 2,916 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 | 46.4 | 17 ft | 55.6 | 632 ft |
| February | 50.0 | 259 ft | 59.5 | 888 ft |
| March | 57.1 | 730 ft | 66.9 | 1,368 ft |
| April | 64.1 | 1,187 ft | 74.0 | 1,820 ft |
| May | 71.8 | 1,681 ft | 80.7 | 2,240 ft |
| June | 78.5 | 2,103 ft | 87.1 | 2,636 ft |
| July | 81.4 | 2,284 ft | 90.7 | 2,856 ft |
| August | 81.8 | 2,309 ft | 91.7 | 2,916 ft |
| September | 76.5 | 1,978 ft | 86.2 | 2,580 ft |
| October | 66.6 | 1,348 ft | 76.4 | 1,971 ft |
| November | 56.1 | 665 ft | 65.3 | 1,265 ft |
| December | 48.6 | 166 ft | 57.5 | 757 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 KJSO
DENSITY ALTITUDE
Field elevation 678 ft — the air behaves like 2,935 ft.
- PRESSURE ALT
- 679 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 Texas fields
- 6X0 — Tarrant Field
Mount Selman · elev 590 ft
- T25 — Aero Estates
Frankston · elev 445 ft
- KRFI — Rusk County
Henderson · elev 442 ft
- KPSN — Palestine Municipal
Palestine · elev 423 ft
- KTYR — Tyler Pounds Regional
Tyler · elev 544 ft
- KOCH — Nacogdoches A L Mangham Jr Regional
Nacogdoches · elev 343 ft
- KDKR — Houston County
Crockett · elev 348 ft
- F44 — Athens Municipal
Athens · elev 444 ft
Frequently asked questions
How high does density altitude get at KJSO in summer?
On a typical August afternoon — around 92 °F at the nearest NOAA normals station — density altitude at Cherokee County reaches roughly 2,916 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 KJSO on an average day?
It swings with the seasons: from roughly 17 ft at the coldest month's average temperature to about 2,309 ft at the warmest month's — all from a constant field elevation of 678 ft. The month-by-month table above carries the full year.
What is the field elevation of Cherokee County?
678 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KJSO (ICAO) / JSO (FAA), in Jacksonville, Texas.