Sewanee, Tennessee · field elev 1,953 ft
Density Altitude at Franklin County (KUOS)
Franklin County sits at 1,953 ft, and even a typical July afternoon (84 °F) only lifts density altitude to about 4,005 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 | 37.2 | 977 ft | 45.4 | 1,531 ft |
| February | 40.6 | 1,208 ft | 49.3 | 1,791 ft |
| March | 49.0 | 1,771 ft | 58.2 | 2,375 ft |
| April | 57.6 | 2,336 ft | 67.4 | 2,965 ft |
| May | 65.1 | 2,819 ft | 74.3 | 3,400 ft |
| June | 71.9 | 3,249 ft | 80.9 | 3,809 ft |
| July | 75.2 | 3,456 ft | 84.1 | 4,005 ft |
| August | 74.6 | 3,418 ft | 83.7 | 3,981 ft |
| September | 69.1 | 3,073 ft | 78.1 | 3,636 ft |
| October | 59.0 | 2,426 ft | 68.4 | 3,028 ft |
| November | 48.9 | 1,764 ft | 57.6 | 2,336 ft |
| December | 40.6 | 1,208 ft | 48.2 | 1,718 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 KUOS
DENSITY ALTITUDE
Field elevation 1,953 ft — the air behaves like 3,999 ft.
- PRESSURE ALT
- 1,954 ft
- ISA DEVIATION
- —
- RULE-OF-THUMB DA
- —
- AIR DENSITY INDEX
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- AIR DENSITY
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- WATER · GRAINS/LB
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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 Tennessee fields
- KBGF — Winchester Municipal
Winchester · elev 979 ft
- KAPT — Marion County/Brown Field
Jasper · elev 641 ft
- KTHA — Tullahoma Regional/Wm Northern Field
Tullahoma · elev 1,084 ft
- KRNC — Warren County Meml
Mc Minnville · elev 1,032 ft
- KFYM — Fayetteville Municipal
Fayetteville · elev 984 ft
- KSYI — Bomar Field/Shelbyville Municipal
Shelbyville · elev 800 ft
- KCHA — Lovell Field
Chattanooga · elev 683 ft
- KFGU — Collegedale Municipal
Collegedale · elev 860 ft
Frequently asked questions
How high does density altitude get at KUOS in summer?
On a typical July afternoon — around 84 °F at the nearest NOAA normals station — density altitude at Franklin County reaches roughly 4,005 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 KUOS on an average day?
It swings with the seasons: from roughly 977 ft at the coldest month's average temperature to about 3,456 ft at the warmest month's — all from a constant field elevation of 1,953 ft. The month-by-month table above carries the full year.
What is the field elevation of Franklin County?
1,953 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KUOS (ICAO) / UOS (FAA), in Sewanee, Tennessee.