Dillon, Montana · field elev 5,245 ft
Density Altitude at Dillon (KDLN)
From a field elevation of 5,245 ft, a typical July afternoon at Dillon (82 °F) raises density altitude to about 7,877 ft — solidly into the range where performance charts deserve a close read.
Typical density altitude by month
| Month | Avg temp °F | DA at avg temp | Afternoon high °F | DA on a typical afternoon |
|---|---|---|---|---|
| January | 22.3 | 4,052 ft | 31.7 | 4,692 ft |
| February | 24.5 | 4,203 ft | 35.2 | 4,926 ft |
| March | 33.2 | 4,793 ft | 45.0 | 5,572 ft ▲ |
| April | 40.1 | 5,251 ft | 52.6 | 6,062 ft ▲ |
| May | 49.0 | 5,831 ft | 62.4 | 6,681 ft ▲ |
| June | 56.6 | 6,317 ft | 70.8 | 7,200 ft ▲ |
| July | 64.9 | 6,837 ft | 82.0 | 7,877 ft ▲ |
| August | 63.4 | 6,744 ft | 80.6 | 7,794 ft ▲ |
| September | 54.7 | 6,196 ft | 70.0 | 7,151 ft ▲ |
| October | 42.2 | 5,389 ft | 55.3 | 6,234 ft ▲ |
| November | 29.9 | 4,571 ft | 40.6 | 5,284 ft ▲ |
| December | 21.1 | 3,969 ft | 30.6 | 4,618 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 KDLN
DENSITY ALTITUDE caution
Field elevation 5,245 ft — the air behaves like 7,877 ft.
- PRESSURE ALT
- 5,247 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 Montana fields
- KRVF — Ruby Valley Field
Twin Bridges · elev 4,789 ft
- 4U9 — Dell Flight Strip
Dell · elev 6,007 ft
- 02T — Wise River
Wise River · elev 5,830 ft
- KEKS — Ennis Big Sky
Ennis · elev 5,433 ft
- KBTM — Bert Mooney
Butte · elev 5,551 ft
- 7S4 — Wisdom
Wisdom · elev 6,133 ft
- 3U3 — Bowman Field
Anaconda · elev 5,034 ft
- 9S5 — Three Forks
Three Forks · elev 4,089 ft
Frequently asked questions
How high does density altitude get at KDLN in summer?
On a typical July afternoon — around 82 °F at the nearest NOAA normals station — density altitude at Dillon reaches roughly 7,877 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 KDLN on an average day?
It swings with the seasons: from roughly 3,969 ft at the coldest month's average temperature to about 6,837 ft at the warmest month's — all from a constant field elevation of 5,245 ft. The month-by-month table above carries the full year.
What is the field elevation of Dillon?
5,245 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KDLN (ICAO) / DLN (FAA), in Dillon, Montana.