Harlingen, Texas · field elev 36 ft
Density Altitude at Valley International (KHRL)
Valley International sits at 36 ft, and even a typical August afternoon (97 °F) only lifts density altitude to about 2,469 ft — heat still trims performance, but the field rarely turns high-and-hot.
Typical density altitude by month
| Month | Avg temp °F | DA at avg temp | Afternoon high °F | DA on a typical afternoon |
|---|---|---|---|---|
| January | 60.8 | 181 ft | 71.7 | 886 ft |
| February | 64.9 | 448 ft | 75.9 | 1,153 ft |
| March | 70.2 | 790 ft | 81.0 | 1,474 ft |
| April | 75.8 | 1,147 ft | 86.5 | 1,816 ft |
| May | 81.2 | 1,487 ft | 91.4 | 2,117 ft |
| June | 84.8 | 1,711 ft | 95.0 | 2,336 ft |
| July | 85.8 | 1,773 ft | 96.2 | 2,409 ft |
| August | 86.2 | 1,798 ft | 97.2 | 2,469 ft |
| September | 82.3 | 1,555 ft | 92.2 | 2,166 ft |
| October | 76.6 | 1,198 ft | 87.6 | 1,884 ft |
| November | 68.4 | 675 ft | 79.3 | 1,368 ft |
| December | 62.4 | 286 ft | 73.2 | 982 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 KHRL
DENSITY ALTITUDE
Field elevation 36 ft — the air behaves like 2,457 ft.
- PRESSURE ALT
- 37 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
- KPIL — Cameron County
Port Isabel · elev 19 ft
- KTXW — Mid Valley
Weslaco · elev 70 ft
- KBRO — Brownsville/South Padre Island International
Brownsville · elev 22 ft
- T05 — Charles R Johnson
Port Mansfield · elev 10 ft
- KEBG — South Texas International At Edinburg
Edinburg · elev 75 ft
- KMFE — Mc Allen International
Mc Allen · elev 107 ft
- KBKS — Brooks County
Falfurrias · elev 112 ft
- 67R — Rio Grande City Municipal
Rio Grande City · elev 290 ft
Frequently asked questions
How high does density altitude get at KHRL in summer?
On a typical August afternoon — around 97 °F at the nearest NOAA normals station — density altitude at Valley International reaches roughly 2,469 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 KHRL on an average day?
It swings with the seasons: from roughly 181 ft at the coldest month's average temperature to about 1,798 ft at the warmest month's — all from a constant field elevation of 36 ft. The month-by-month table above carries the full year.
What is the field elevation of Valley International?
36 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KHRL (ICAO) / HRL (FAA), in Harlingen, Texas.