Walworth, Wisconsin · field elev 948 ft
Density Altitude at Big Foot Airfield (7V3)
Big Foot Airfield sits at 948 ft, and even a typical July afternoon (83 °F) only lifts density altitude to about 2,706 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 | 21.3 | −1,392 ft | 29.2 | −831 ft |
| February | 24.3 | −1,177 ft | 32.6 | −593 ft |
| March | 34.3 | −475 ft | 43.7 | 170 ft |
| April | 46.4 | 352 ft | 57.0 | 1,057 ft |
| May | 57.9 | 1,116 ft | 68.8 | 1,821 ft |
| June | 67.9 | 1,763 ft | 79.0 | 2,464 ft |
| July | 71.9 | 2,018 ft | 82.9 | 2,706 ft |
| August | 70.0 | 1,897 ft | 81.1 | 2,595 ft |
| September | 62.7 | 1,429 ft | 74.2 | 2,163 ft |
| October | 50.2 | 607 ft | 60.8 | 1,305 ft |
| November | 37.6 | −247 ft | 46.2 | 339 ft |
| December | 27.1 | −979 ft | 34.5 | −461 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 7V3
DENSITY ALTITUDE
Field elevation 948 ft — the air behaves like 2,713 ft.
- PRESSURE ALT
- 949 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
- C59 — Lake Lawn
Delavan · elev 981 ft
- 44C — Beloit
Beloit · elev 817 ft
- KJVL — Southern Wisconsin Regional
Janesville · elev 808 ft
- KBUU — Burlington Municipal
Burlington · elev 780 ft
- 5Y3 — Gutzmer'S Twin Oaks
Whitewater · elev 821 ft
- 57C — East Troy Municipal
East Troy · elev 860 ft
- 88C — Palmyra Municipal
Palmyra · elev 851 ft
- 49C — Camp Lake
Camp Lake · elev 749 ft
Frequently asked questions
How high does density altitude get at 7V3 in summer?
On a typical July afternoon — around 83 °F at the nearest NOAA normals station — density altitude at Big Foot Airfield reaches roughly 2,706 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 7V3 on an average day?
It swings with the seasons: from roughly −1,392 ft at the coldest month's average temperature to about 2,018 ft at the warmest month's — all from a constant field elevation of 948 ft. The month-by-month table above carries the full year.
What is the field elevation of Big Foot Airfield?
948 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 7V3 (FAA), in Walworth, Wisconsin.