San Andreas, California · field elev 1,328 ft
Density Altitude at Calaveras County/Maury Rasmussen Field (KCPU)
Calaveras County/Maury Rasmussen Field sits at 1,328 ft, and even a typical July afternoon (97 °F) only lifts density altitude to about 4,031 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 | 47.8 | 917 ft | 57.3 | 1,546 ft |
| February | 50.1 | 1,071 ft | 60.6 | 1,761 ft |
| March | 54.2 | 1,342 ft | 64.8 | 2,032 ft |
| April | 57.9 | 1,585 ft | 70.0 | 2,364 ft |
| May | 65.9 | 2,102 ft | 79.4 | 2,953 ft |
| June | 74.2 | 2,629 ft | 89.3 | 3,561 ft |
| July | 81.3 | 3,071 ft | 97.1 | 4,031 ft |
| August | 80.3 | 3,009 ft | 96.2 | 3,977 ft |
| September | 75.5 | 2,710 ft | 90.7 | 3,646 ft |
| October | 66.0 | 2,109 ft | 79.7 | 2,972 ft |
| November | 55.0 | 1,395 ft | 66.0 | 2,109 ft |
| December | 47.6 | 904 ft | 57.4 | 1,552 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 KCPU
DENSITY ALTITUDE
Field elevation 1,328 ft — the air behaves like 4,025 ft.
- PRESSURE ALT
- 1,329 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
- O22 — Columbia
Columbia · elev 2,121 ft
- KJAQ — Westover Field Amador County
Jackson · elev 1,693 ft
- O27 — Oakdale
Oakdale · elev 237 ft
- E45 — Groveland/Yosemite
Groveland · elev 2,933 ft
- 1O3 — Lodi
Lodi · elev 60 ft
- KRIU — Rancho Murieta
Rancho Murieta · elev 144 ft
- KSCK — Stockton Metro
Stockton · elev 33 ft
- L53 — Lodi Airpark
Lodi · elev 25 ft
Frequently asked questions
How high does density altitude get at KCPU in summer?
On a typical July afternoon — around 97 °F at the nearest NOAA normals station — density altitude at Calaveras County/Maury Rasmussen Field reaches roughly 4,031 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 KCPU on an average day?
It swings with the seasons: from roughly 904 ft at the coldest month's average temperature to about 3,071 ft at the warmest month's — all from a constant field elevation of 1,328 ft. The month-by-month table above carries the full year.
What is the field elevation of Calaveras County/Maury Rasmussen Field?
1,328 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KCPU (ICAO) / CPU (FAA), in San Andreas, California.