Herlong, California · field elev 4,062 ft
Density Altitude at Herlong (H37)
From a field elevation of 4,062 ft, a typical July afternoon at Herlong (88 °F) raises density altitude to about 6,801 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 | 33.3 | 3,332 ft | 42.8 | 3,968 ft |
| February | 37.9 | 3,642 ft | 48.5 | 4,342 ft |
| March | 43.5 | 4,014 ft | 55.6 | 4,801 ft |
| April | 47.6 | 4,283 ft | 61.5 | 5,177 ft ▲ |
| May | 55.2 | 4,776 ft | 69.9 | 5,703 ft ▲ |
| June | 62.4 | 5,234 ft | 79.4 | 6,285 ft ▲ |
| July | 69.5 | 5,678 ft | 88.0 | 6,801 ft ▲ |
| August | 68.0 | 5,585 ft | 87.1 | 6,748 ft ▲ |
| September | 61.6 | 5,183 ft | 79.8 | 6,309 ft ▲ |
| October | 51.7 | 4,550 ft | 67.2 | 5,535 ft ▲ |
| November | 40.1 | 3,789 ft | 51.9 | 4,563 ft |
| December | 33.0 | 3,312 ft | 42.1 | 3,921 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 H37
DENSITY ALTITUDE caution
Field elevation 4,062 ft — the air behaves like 6,801 ft.
- PRESSURE ALT
- 4,064 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 California fields
- O02 — Nervino
Beckwourth · elev 4,900 ft
- KSVE — Susanville Municipal
Susanville · elev 4,149 ft
- O79 — Sierraville Dearwater
Sierraville · elev 4,990 ft
- 2O1 — Gansner Field
Quincy · elev 3,419 ft
- O39 — Ravendale
Ravendale · elev 5,306 ft
- 1Q2 — Spaulding
Susanville · elev 5,116 ft
- KTRK — Truckee-Tahoe
Truckee · elev 5,904 ft
- O05 — Rogers Field
Chester · elev 4,534 ft
Frequently asked questions
How high does density altitude get at H37 in summer?
On a typical July afternoon — around 88 °F at the nearest NOAA normals station — density altitude at Herlong reaches roughly 6,801 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 H37 on an average day?
It swings with the seasons: from roughly 3,312 ft at the coldest month's average temperature to about 5,678 ft at the warmest month's — all from a constant field elevation of 4,062 ft. The month-by-month table above carries the full year.
What is the field elevation of Herlong?
4,062 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is H37 (FAA), in Herlong, California.