Sullivan, Wisconsin · field elev 843 ft
Density Altitude at Lake Country (W11)
Lake Country sits at 843 ft, and even a typical July afternoon (82 °F) only lifts density altitude to about 2,529 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 | 19.1 | −1,682 ft | 26.9 | −1,124 ft |
| February | 22.6 | −1,430 ft | 31.0 | −836 ft |
| March | 33.5 | −661 ft | 43.2 | 6 ft |
| April | 45.6 | 168 ft | 56.4 | 888 ft |
| May | 57.3 | 947 ft | 68.5 | 1,673 ft |
| June | 67.2 | 1,590 ft | 78.3 | 2,292 ft |
| July | 71.1 | 1,839 ft | 82.1 | 2,529 ft |
| August | 69.4 | 1,730 ft | 80.3 | 2,417 ft |
| September | 62.0 | 1,254 ft | 73.3 | 1,978 ft |
| October | 49.8 | 450 ft | 60.0 | 1,124 ft |
| November | 36.5 | −453 ft | 45.0 | 128 ft |
| December | 24.9 | −1,266 ft | 32.5 | −731 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 W11
DENSITY ALTITUDE
Field elevation 843 ft — the air behaves like 2,523 ft.
- PRESSURE ALT
- 844 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
- 88C — Palmyra Municipal
Palmyra · elev 851 ft
- 61C — Fort Atkinson Municipal
Fort Atkinson · elev 800 ft
- KRYV — Watertown Municipal
Watertown · elev 833 ft
- 5Y3 — Gutzmer'S Twin Oaks
Whitewater · elev 821 ft
- 57C — East Troy Municipal
East Troy · elev 860 ft
- KUES — Waukesha County
Waukesha · elev 912 ft
- 02C — Capitol Drive
Brookfield · elev 844 ft
- 58C — Jana
Edgerton · elev 843 ft
Frequently asked questions
How high does density altitude get at W11 in summer?
On a typical July afternoon — around 82 °F at the nearest NOAA normals station — density altitude at Lake Country reaches roughly 2,529 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 W11 on an average day?
It swings with the seasons: from roughly −1,682 ft at the coldest month's average temperature to about 1,839 ft at the warmest month's — all from a constant field elevation of 843 ft. The month-by-month table above carries the full year.
What is the field elevation of Lake Country?
843 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is W11 (FAA), in Sullivan, Wisconsin.