Riverside/Rubidoux/, California · field elev 767 ft
Density Altitude at Flabob (KRIR)
Flabob sits at 767 ft, and even a typical August afternoon (95 °F) only lifts density altitude to about 3,218 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 | 55.6 | 742 ft | 67.7 | 1,528 ft |
| February | 56.3 | 788 ft | 67.9 | 1,541 ft |
| March | 59.5 | 998 ft | 72.1 | 1,809 ft |
| April | 62.9 | 1,219 ft | 75.9 | 2,049 ft |
| May | 67.6 | 1,522 ft | 79.9 | 2,299 ft |
| June | 73.0 | 1,866 ft | 86.7 | 2,720 ft |
| July | 78.6 | 2,218 ft | 93.3 | 3,122 ft |
| August | 79.8 | 2,293 ft | 94.9 | 3,218 ft |
| September | 76.6 | 2,093 ft | 91.3 | 3,000 ft |
| October | 68.9 | 1,605 ft | 82.7 | 2,473 ft |
| November | 61.0 | 1,095 ft | 74.5 | 1,961 ft |
| December | 54.8 | 689 ft | 66.8 | 1,470 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 KRIR
DENSITY ALTITUDE
Field elevation 767 ft — the air behaves like 3,224 ft.
- PRESSURE ALT
- 768 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
- KRAL — Riverside
Riverside · elev 819 ft
- KRIV — March Arb
Riverside · elev 1,536 ft
- KONT — Ontario International
Ontario · elev 944 ft
- KSBD — San Bernardino International
San Bernardino · elev 1,159 ft
- KAJO — Corona Municipal
Corona · elev 533 ft
- KCNO — Chino
Chino · elev 650 ft
- KREI — Redlands Municipal
Redlands · elev 1,574 ft
- KCCB — Cable
Upland · elev 1,444 ft
Frequently asked questions
How high does density altitude get at KRIR in summer?
On a typical August afternoon — around 95 °F at the nearest NOAA normals station — density altitude at Flabob reaches roughly 3,218 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 KRIR on an average day?
It swings with the seasons: from roughly 689 ft at the coldest month's average temperature to about 2,293 ft at the warmest month's — all from a constant field elevation of 767 ft. The month-by-month table above carries the full year.
What is the field elevation of Flabob?
767 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KRIR (ICAO) / RIR (FAA), in Riverside/Rubidoux/, California.