Marfa, Texas · field elev 4,849 ft
Density Altitude at Marfa Municipal (KMRF)
From a field elevation of 4,849 ft, a typical June afternoon at Marfa Municipal (92 °F) raises density altitude to about 7,960 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 | 41.9 | 4,881 ft | 59.4 | 6,008 ft ▲ |
| February | 45.4 | 5,110 ft | 62.6 | 6,210 ft ▲ |
| March | 51.9 | 5,531 ft | 70.1 | 6,675 ft ▲ |
| April | 59.6 | 6,021 ft | 78.4 | 7,181 ft ▲ |
| May | 68.0 | 6,545 ft | 86.5 | 7,665 ft ▲ |
| June | 75.1 | 6,981 ft | 91.5 | 7,960 ft ▲ |
| July | 75.2 | 6,987 ft | 89.6 | 7,848 ft ▲ |
| August | 73.8 | 6,902 ft | 87.4 | 7,718 ft ▲ |
| September | 68.3 | 6,564 ft | 83.3 | 7,475 ft ▲ |
| October | 59.8 | 6,034 ft | 76.3 | 7,054 ft ▲ |
| November | 50.5 | 5,441 ft | 68.0 | 6,545 ft ▲ |
| December | 42.4 | 4,914 ft | 59.2 | 5,996 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 KMRF
DENSITY ALTITUDE caution
Field elevation 4,849 ft — the air behaves like 7,989 ft.
- PRESSURE ALT
- 4,851 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
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- KFST — Fort Stockton-Pecos County
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Frequently asked questions
How high does density altitude get at KMRF in summer?
On a typical June afternoon — around 92 °F at the nearest NOAA normals station — density altitude at Marfa Municipal reaches roughly 7,960 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 KMRF on an average day?
It swings with the seasons: from roughly 4,881 ft at the coldest month's average temperature to about 6,987 ft at the warmest month's — all from a constant field elevation of 4,849 ft. The month-by-month table above carries the full year.
What is the field elevation of Marfa Municipal?
4,849 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KMRF (ICAO) / MRF (FAA), in Marfa, Texas.