Fort Sumner, New Mexico · field elev 4,165 ft
Density Altitude at Fort Sumner Municipal (KFSU)
From a field elevation of 4,165 ft, a typical July afternoon at Fort Sumner Municipal (92 °F) raises density altitude to about 7,145 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 | 39.7 | 3,889 ft | 54.9 | 4,883 ft |
| February | 43.9 | 4,168 ft | 59.5 | 5,176 ft ▲ |
| March | 51.4 | 4,657 ft | 67.4 | 5,673 ft ▲ |
| April | 58.6 | 5,119 ft | 74.2 | 6,093 ft ▲ |
| May | 67.1 | 5,654 ft | 81.8 | 6,555 ft ▲ |
| June | 76.4 | 6,228 ft | 90.5 | 7,074 ft ▲ |
| July | 79.0 | 6,386 ft | 91.7 | 7,145 ft ▲ |
| August | 77.2 | 6,276 ft | 89.9 | 7,039 ft ▲ |
| September | 70.2 | 5,847 ft | 83.7 | 6,669 ft ▲ |
| October | 59.3 | 5,164 ft | 74.3 | 6,099 ft ▲ |
| November | 47.9 | 4,430 ft | 63.1 | 5,404 ft ▲ |
| December | 39.8 | 3,896 ft | 54.7 | 4,870 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 KFSU
DENSITY ALTITUDE caution
Field elevation 4,165 ft — the air behaves like 7,163 ft.
- PRESSURE ALT
- 4,167 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 New Mexico fields
- KSXU — Santa Rosa Route 66
Santa Rosa · elev 4,791 ft
- KPRZ — Portales Municipal
Portales · elev 4,078 ft
- N17 — Vaughn Municipal
Vaughn · elev 5,936 ft
- KTCC — Tucumcari Municipal
Tucumcari · elev 4,065 ft
- E89 — Conchas Lake
Conchas Dam · elev 4,232 ft
- KCVN — Clovis Regional
Clovis · elev 4,216 ft
- KROW — Roswell Air Center
Roswell · elev 3,671 ft
- KLVS — Las Vegas Municipal
Las Vegas · elev 6,877 ft
Frequently asked questions
How high does density altitude get at KFSU in summer?
On a typical July afternoon — around 92 °F at the nearest NOAA normals station — density altitude at Fort Sumner Municipal reaches roughly 7,145 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 KFSU on an average day?
It swings with the seasons: from roughly 3,889 ft at the coldest month's average temperature to about 6,386 ft at the warmest month's — all from a constant field elevation of 4,165 ft. The month-by-month table above carries the full year.
What is the field elevation of Fort Sumner Municipal?
4,165 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KFSU (ICAO) / FSU (FAA), in Fort Sumner, New Mexico.