Santa Rosa, California · field elev 129 ft
Density Altitude at Charles M Schulz/Sonoma County (KSTS)
Charles M Schulz/Sonoma County sits at 129 ft, and even a typical August afternoon (84 °F) only lifts density altitude to about 1,781 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 | 47.7 | −576 ft | 57.9 | 105 ft |
| February | 50.5 | −387 ft | 61.7 | 355 ft |
| March | 53.3 | −200 ft | 65.1 | 576 ft |
| April | 56.1 | −14 ft | 69.0 | 828 ft |
| May | 60.7 | 289 ft | 74.7 | 1,191 ft |
| June | 65.9 | 628 ft | 81.8 | 1,638 ft |
| July | 67.6 | 737 ft | 83.5 | 1,744 ft |
| August | 68.0 | 763 ft | 84.1 | 1,781 ft |
| September | 66.5 | 666 ft | 83.4 | 1,738 ft |
| October | 61.3 | 328 ft | 77.1 | 1,343 ft |
| November | 52.8 | −233 ft | 65.4 | 595 ft |
| December | 47.2 | −610 ft | 57.5 | 79 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 KSTS
DENSITY ALTITUDE
Field elevation 129 ft — the air behaves like 1,775 ft.
- PRESSURE ALT
- 130 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
- KHES — Healdsburg Municipal
Healdsburg · elev 280 ft
- O69 — Petaluma Municipal
Petaluma · elev 90 ft
- O60 — Cloverdale Municipal
Cloverdale · elev 276 ft
- 2O3 — Angwin-Parrett Field
Angwin · elev 1,875 ft
- 0Q9 — Sonoma Skypark
Sonoma · elev 29 ft
- 0Q3 — Sonoma Valley
Schellville/Sonoma · elev 16 ft
- KDVO — Gnoss Field
Novato · elev 4 ft
- 1O2 — Lampson Field
Lakeport · elev 1,380 ft
Frequently asked questions
How high does density altitude get at KSTS in summer?
On a typical August afternoon — around 84 °F at the nearest NOAA normals station — density altitude at Charles M Schulz/Sonoma County reaches roughly 1,781 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 KSTS on an average day?
It swings with the seasons: from roughly −610 ft at the coldest month's average temperature to about 763 ft at the warmest month's — all from a constant field elevation of 129 ft. The month-by-month table above carries the full year.
What is the field elevation of Charles M Schulz/Sonoma County?
129 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KSTS (ICAO) / STS (FAA), in Santa Rosa, California.