Willits, California · field elev 2,066 ft
Density Altitude at Ells Field/Willits Municipal (O28)
Ells Field/Willits Municipal sits at 2,066 ft, and even a typical July afternoon (84 °F) only lifts density altitude to about 4,106 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 | 43.5 | 1,544 ft | 53.7 | 2,220 ft |
| February | 45.2 | 1,658 ft | 56.3 | 2,390 ft |
| March | 47.3 | 1,798 ft | 59.0 | 2,565 ft |
| April | 49.5 | 1,944 ft | 61.8 | 2,746 ft |
| May | 54.6 | 2,279 ft | 68.9 | 3,199 ft |
| June | 59.9 | 2,624 ft | 75.5 | 3,613 ft |
| July | 65.8 | 3,002 ft | 83.5 | 4,106 ft |
| August | 64.5 | 2,919 ft | 83.3 | 4,094 ft |
| September | 62.0 | 2,759 ft | 81.9 | 4,008 ft |
| October | 54.6 | 2,279 ft | 72.4 | 3,419 ft |
| November | 47.6 | 1,818 ft | 59.9 | 2,624 ft |
| December | 42.6 | 1,483 ft | 53.0 | 2,174 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 O28
DENSITY ALTITUDE
Field elevation 2,066 ft — the air behaves like 4,136 ft.
- PRESSURE ALT
- 2,067 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
- 1Q5 — Gravelly Valley
Upper Lake · elev 1,900 ft
- O09 — Round Valley
Covelo · elev 1,434 ft
- KLLR — Little River
Little River · elev 574 ft
- KUKI — Ukiah Municipal
Ukiah · elev 617 ft
- D83 — Boonville
Boonville · elev 379 ft
- 1O2 — Lampson Field
Lakeport · elev 1,380 ft
- E55 — Ocean Ridge
Gualala · elev 934 ft
- O16 — Garberville
Garberville · elev 551 ft
Frequently asked questions
How high does density altitude get at O28 in summer?
On a typical July afternoon — around 84 °F at the nearest NOAA normals station — density altitude at Ells Field/Willits Municipal reaches roughly 4,106 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 O28 on an average day?
It swings with the seasons: from roughly 1,483 ft at the coldest month's average temperature to about 3,002 ft at the warmest month's — all from a constant field elevation of 2,066 ft. The month-by-month table above carries the full year.
What is the field elevation of Ells Field/Willits Municipal?
2,066 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is O28 (FAA), in Willits, California.