Sparta, Wisconsin · field elev 839 ft
Density Altitude at Sparta/Fort Mc Coy (KCMY)
Sparta/Fort Mc Coy sits at 839 ft, and even a typical July afternoon (82 °F) only lifts density altitude to about 2,530 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 | 15.0 | −1,984 ft | 24.5 | −1,300 ft |
| February | 19.4 | −1,665 ft | 29.5 | −946 ft |
| March | 31.5 | −806 ft | 41.8 | −95 ft |
| April | 44.2 | 69 ft | 55.7 | 837 ft |
| May | 56.6 | 896 ft | 68.4 | 1,662 ft |
| June | 66.9 | 1,565 ft | 78.2 | 2,281 ft |
| July | 70.8 | 1,815 ft | 82.2 | 2,530 ft |
| August | 68.5 | 1,668 ft | 80.1 | 2,400 ft |
| September | 60.2 | 1,132 ft | 72.3 | 1,910 ft |
| October | 47.0 | 258 ft | 58.5 | 1,021 ft |
| November | 33.6 | −659 ft | 42.8 | −26 ft |
| December | 21.5 | −1,514 ft | 30.0 | −911 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 KCMY
DENSITY ALTITUDE
Field elevation 839 ft — the air behaves like 2,518 ft.
- PRESSURE ALT
- 840 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 Wisconsin fields
- Y72 — Bloyer Field
Tomah · elev 966 ft
- KBCK — Black River Falls Area
Black River Falls · elev 836 ft
- KLSE — La Crosse Regional
La Crosse · elev 655 ft
- Y51 — Viroqua Municipal
Viroqua · elev 1,292 ft
- 60C — Elroy
Elroy · elev 944 ft
- 82C — Mauston/New Lisbon Union
New Lisbon · elev 908 ft
- KDAF — Necedah
Necedah · elev 919 ft
- KVIQ — Neillsville Municipal
Neillsville · elev 1,238 ft
Frequently asked questions
How high does density altitude get at KCMY in summer?
On a typical July afternoon — around 82 °F at the nearest NOAA normals station — density altitude at Sparta/Fort Mc Coy reaches roughly 2,530 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 KCMY on an average day?
It swings with the seasons: from roughly −1,984 ft at the coldest month's average temperature to about 1,815 ft at the warmest month's — all from a constant field elevation of 839 ft. The month-by-month table above carries the full year.
What is the field elevation of Sparta/Fort Mc Coy?
839 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KCMY (ICAO) / CMY (FAA), in Sparta, Wisconsin.