Hardin, Montana · field elev 3,025 ft
Density Altitude at Big Horn County (00U)
From a field elevation of 3,025 ft, a typical July afternoon at Big Horn County (91 °F) raises density altitude to about 5,706 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 | 23.7 | 1,380 ft | 36.4 | 2,254 ft |
| February | 27.8 | 1,665 ft | 41.1 | 2,571 ft |
| March | 37.9 | 2,356 ft | 52.8 | 3,344 ft |
| April | 47.0 | 2,964 ft | 62.1 | 3,943 ft |
| May | 56.3 | 3,571 ft | 71.4 | 4,529 ft |
| June | 65.3 | 4,146 ft | 81.0 | 5,121 ft ▲ |
| July | 73.1 | 4,635 ft | 90.7 | 5,706 ft ▲ |
| August | 71.5 | 4,535 ft | 89.7 | 5,646 ft ▲ |
| September | 61.6 | 3,911 ft | 79.1 | 5,005 ft ▲ |
| October | 48.2 | 3,043 ft | 63.6 | 4,039 ft |
| November | 34.9 | 2,153 ft | 48.3 | 3,049 ft |
| December | 25.5 | 1,505 ft | 38.0 | 2,363 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 00U
DENSITY ALTITUDE caution
Field elevation 3,025 ft — the air behaves like 5,723 ft.
- PRESSURE ALT
- 3,027 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
- 5U7 — Fort Smith Landing Strip
Fort Smith · elev 3,242 ft
- KBIL — Billings Logan International
Billings · elev 3,662 ft
- 6U7 — Hysham
Hysham · elev 2,624 ft
- M46 — Colstrip
Colstrip · elev 3,428 ft
- 6S8 — Laurel Municipal
Laurel · elev 3,543 ft
- 1S3 — Tillitt Field
Forsyth · elev 2,729 ft
- KRPX — Roundup
Roundup · elev 3,490 ft
- 3U4 — St Labre Mission
Ashland · elev 2,909 ft
Frequently asked questions
How high does density altitude get at 00U in summer?
On a typical July afternoon — around 91 °F at the nearest NOAA normals station — density altitude at Big Horn County reaches roughly 5,706 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 00U on an average day?
It swings with the seasons: from roughly 1,380 ft at the coldest month's average temperature to about 4,635 ft at the warmest month's — all from a constant field elevation of 3,025 ft. The month-by-month table above carries the full year.
What is the field elevation of Big Horn County?
3,025 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 00U (FAA), in Hardin, Montana.