Chiriaco Summit, California · field elev 1,711 ft
Density Altitude at Chiriaco Summit (L77)
Chiriaco Summit sits at 1,711 ft, and even a typical July afternoon (103 °F) only lifts density altitude to about 4,831 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 | 52.9 | 1,730 ft | 65.8 | 2,566 ft |
| February | 54.5 | 1,835 ft | 67.4 | 2,668 ft |
| March | 60.2 | 2,206 ft | 74.8 | 3,135 ft |
| April | 67.0 | 2,643 ft | 82.6 | 3,618 ft |
| May | 73.7 | 3,066 ft | 89.3 | 4,027 ft |
| June | 82.4 | 3,606 ft | 98.7 | 4,590 ft |
| July | 88.4 | 3,972 ft | 102.8 | 4,831 ft |
| August | 88.4 | 3,972 ft | 101.5 | 4,755 ft |
| September | 82.0 | 3,581 ft | 96.2 | 4,441 ft |
| October | 71.2 | 2,909 ft | 86.3 | 3,845 ft |
| November | 60.3 | 2,213 ft | 74.4 | 3,110 ft |
| December | 51.8 | 1,657 ft | 64.0 | 2,451 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 L77
DENSITY ALTITUDE
Field elevation 1,711 ft — the air behaves like 4,843 ft.
- PRESSURE ALT
- 1,712 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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Frequently asked questions
How high does density altitude get at L77 in summer?
On a typical July afternoon — around 103 °F at the nearest NOAA normals station — density altitude at Chiriaco Summit reaches roughly 4,831 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 L77 on an average day?
It swings with the seasons: from roughly 1,657 ft at the coldest month's average temperature to about 3,972 ft at the warmest month's — all from a constant field elevation of 1,711 ft. The month-by-month table above carries the full year.
What is the field elevation of Chiriaco Summit?
1,711 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is L77 (FAA), in Chiriaco Summit, California.