Amarillo, Texas · field elev 3,585 ft
Density Altitude at River Falls (H81)
From a field elevation of 3,585 ft, a typical July afternoon at River Falls (93 °F) raises density altitude to about 6,514 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 | 38.6 | 3,098 ft | 52.2 | 3,995 ft |
| February | 41.8 | 3,311 ft | 56.1 | 4,247 ft |
| March | 49.8 | 3,839 ft | 64.8 | 4,801 ft |
| April | 57.5 | 4,337 ft | 72.4 | 5,275 ft ▲ |
| May | 66.8 | 4,926 ft | 80.9 | 5,796 ft ▲ |
| June | 76.1 | 5,503 ft | 89.7 | 6,325 ft ▲ |
| July | 79.6 | 5,717 ft | 92.9 | 6,514 ft ▲ |
| August | 78.1 | 5,625 ft | 91.0 | 6,402 ft ▲ |
| September | 70.9 | 5,182 ft | 84.0 | 5,983 ft ▲ |
| October | 59.2 | 4,446 ft | 73.0 | 5,312 ft ▲ |
| November | 47.4 | 3,682 ft | 61.3 | 4,579 ft |
| December | 38.8 | 3,111 ft | 51.9 | 3,976 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 H81
DENSITY ALTITUDE caution
Field elevation 3,585 ft — the air behaves like 6,520 ft.
- PRESSURE ALT
- 3,587 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 Texas fields
- 1E4 — Palo Duro
Amarillo · elev 3,639 ft
- 1E7 — Buffalo
Amarillo · elev 3,640 ft
- KTDW — Tradewind
Amarillo · elev 3,649 ft
- KAMA — Rick Husband Amarillo International
Amarillo · elev 3,607 ft
- 55T — Eagles Aerodrome
Conway · elev 3,475 ft
- T45 — Panhandle-Carson County
Panhandle · elev 3,454 ft
- I06 — City Of Tulia/Swisher County Municipal
Tulia · elev 3,503 ft
- KHRX — Hereford Municipal
Hereford · elev 3,788 ft
Frequently asked questions
How high does density altitude get at H81 in summer?
On a typical July afternoon — around 93 °F at the nearest NOAA normals station — density altitude at River Falls reaches roughly 6,514 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 H81 on an average day?
It swings with the seasons: from roughly 3,098 ft at the coldest month's average temperature to about 5,717 ft at the warmest month's — all from a constant field elevation of 3,585 ft. The month-by-month table above carries the full year.
What is the field elevation of River Falls?
3,585 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is H81 (FAA), in Amarillo, Texas.