Atlanta, Georgia · field elev 1,040 ft
Density Altitude at Cobb County International/Mccollum Field (KRYY)
Cobb County International/Mccollum Field sits at 1,040 ft, and even a typical July afternoon (90 °F) only lifts density altitude to about 3,253 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 | 41.9 | 162 ft | 52.5 | 874 ft |
| February | 45.4 | 399 ft | 56.8 | 1,158 ft |
| March | 52.7 | 887 ft | 64.9 | 1,684 ft |
| April | 60.7 | 1,412 ft | 73.5 | 2,232 ft |
| May | 68.6 | 1,921 ft | 80.7 | 2,682 ft |
| June | 75.9 | 2,383 ft | 87.0 | 3,071 ft |
| July | 79.2 | 2,589 ft | 90.0 | 3,253 ft |
| August | 78.5 | 2,546 ft | 89.2 | 3,205 ft |
| September | 72.9 | 2,194 ft | 84.5 | 2,917 ft |
| October | 62.1 | 1,503 ft | 74.5 | 2,295 ft |
| November | 51.5 | 808 ft | 63.6 | 1,600 ft |
| December | 44.4 | 332 ft | 54.9 | 1,033 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 KRYY
DENSITY ALTITUDE
Field elevation 1,040 ft — the air behaves like 3,253 ft.
- PRESSURE ALT
- 1,041 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 Georgia fields
- KVPC — Cartersville
Cartersville · elev 759 ft
- KFTY — Fulton County Exec/Charlie Brown Field
Atlanta · elev 841 ft
- KPDK — Dekalb-Peachtree
Atlanta · elev 998 ft
- KPUJ — Paulding Northwest Atlanta
Atlanta · elev 1,289 ft
- KCNI — Cherokee County Regional
Canton · elev 1,220 ft
- KATL — Hartsfield/Jackson Atlanta International
Atlanta · elev 1,026 ft
- 4A4 — Polk County/Cornelius Moore Field
Cedartown · elev 974 ft
- KJZP — Pickens County
Jasper · elev 1,535 ft
Frequently asked questions
How high does density altitude get at KRYY in summer?
On a typical July afternoon — around 90 °F at the nearest NOAA normals station — density altitude at Cobb County International/Mccollum Field reaches roughly 3,253 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 KRYY on an average day?
It swings with the seasons: from roughly 162 ft at the coldest month's average temperature to about 2,589 ft at the warmest month's — all from a constant field elevation of 1,040 ft. The month-by-month table above carries the full year.
What is the field elevation of Cobb County International/Mccollum Field?
1,040 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KRYY (ICAO) / RYY (FAA), in Atlanta, Georgia.