Fall River Mills, California · field elev 3,328 ft
Density Altitude at Fall River Mills (O89)
From a field elevation of 3,328 ft, a typical July afternoon at Fall River Mills (91 °F) raises density altitude to about 6,114 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 | 35.0 | 2,536 ft | 47.7 | 3,384 ft |
| February | 38.0 | 2,739 ft | 52.5 | 3,698 ft |
| March | 42.9 | 3,067 ft | 58.2 | 4,066 ft |
| April | 47.8 | 3,391 ft | 63.8 | 4,423 ft |
| May | 55.9 | 3,918 ft | 73.6 | 5,036 ft ▲ |
| June | 62.8 | 4,359 ft | 82.4 | 5,574 ft ▲ |
| July | 69.2 | 4,762 ft | 91.4 | 6,114 ft ▲ |
| August | 67.3 | 4,643 ft | 90.5 | 6,061 ft ▲ |
| September | 61.3 | 4,264 ft | 84.5 | 5,701 ft ▲ |
| October | 50.9 | 3,594 ft | 71.4 | 4,899 ft |
| November | 40.6 | 2,913 ft | 55.7 | 3,905 ft |
| December | 34.2 | 2,481 ft | 46.4 | 3,299 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 O89
DENSITY ALTITUDE caution
Field elevation 3,328 ft — the air behaves like 6,091 ft.
- PRESSURE ALT
- 3,330 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
- O55 — Southard Field
Bieber · elev 4,163 ft
- A26 — Adin
Adin · elev 4,234 ft
- 1Q2 — Spaulding
Susanville · elev 5,116 ft
- 1O6 — Dunsmuir Municipal-Mott
Dunsmuir · elev 3,261 ft
- A24 — California Pines
Alturas · elev 4,389 ft
- O05 — Rogers Field
Chester · elev 4,534 ft
- KAAT — Alturas Municipal
Alturas · elev 4,378 ft
- KRDD — Redding Regional
Redding · elev 505 ft
Frequently asked questions
How high does density altitude get at O89 in summer?
On a typical July afternoon — around 91 °F at the nearest NOAA normals station — density altitude at Fall River Mills reaches roughly 6,114 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 O89 on an average day?
It swings with the seasons: from roughly 2,481 ft at the coldest month's average temperature to about 4,762 ft at the warmest month's — all from a constant field elevation of 3,328 ft. The month-by-month table above carries the full year.
What is the field elevation of Fall River Mills?
3,328 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is O89 (FAA), in Fall River Mills, California.