Clinton, Montana · field elev 3,547 ft
Density Altitude at Rock Creek (RC0)
From a field elevation of 3,547 ft, a typical July afternoon at Rock Creek (82 °F) raises density altitude to about 5,816 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 | 19.1 | 1,709 ft | 29.8 | 2,453 ft |
| February | 21.7 | 1,892 ft | 35.0 | 2,808 ft |
| March | 31.5 | 2,570 ft | 45.5 | 3,510 ft |
| April | 38.8 | 3,064 ft | 53.8 | 4,052 ft |
| May | 46.9 | 3,602 ft | 64.0 | 4,704 ft |
| June | 54.8 | 4,117 ft | 71.3 | 5,161 ft ▲ |
| July | 61.3 | 4,533 ft | 82.0 | 5,816 ft ▲ |
| August | 60.2 | 4,463 ft | 81.8 | 5,804 ft ▲ |
| September | 51.5 | 3,903 ft | 71.0 | 5,142 ft ▲ |
| October | 39.4 | 3,104 ft | 55.4 | 4,155 ft |
| November | 27.7 | 2,309 ft | 39.3 | 3,097 ft |
| December | 18.9 | 1,695 ft | 29.1 | 2,405 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 RC0
DENSITY ALTITUDE caution
Field elevation 3,547 ft — the air behaves like 5,816 ft.
- PRESSURE ALT
- 3,549 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
- M26 — Drummond
Drummond · elev 4,245 ft
- 32S — Stevensville
Stevensville · elev 3,614 ft
- KMSO — Missoula Montana
Missoula · elev 3,206 ft
- U05 — Riddick Field
Philipsburg · elev 5,219 ft
- 23S — Seeley Lake
Seeley Lake · elev 4,256 ft
- KHRF — Ravalli County
Hamilton · elev 3,636 ft
- 52S — St Ignatius
St Ignatius · elev 3,006 ft
- 38S — Deer Lodge-City-County
Deer Lodge · elev 4,693 ft
Frequently asked questions
How high does density altitude get at RC0 in summer?
On a typical July afternoon — around 82 °F at the nearest NOAA normals station — density altitude at Rock Creek reaches roughly 5,816 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 RC0 on an average day?
It swings with the seasons: from roughly 1,695 ft at the coldest month's average temperature to about 4,533 ft at the warmest month's — all from a constant field elevation of 3,547 ft. The month-by-month table above carries the full year.
What is the field elevation of Rock Creek?
3,547 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is RC0 (FAA), in Clinton, Montana.