Chilton, Wisconsin · field elev 913 ft

Density Altitude at Flying Feathers (11Y)

Flying Feathers sits at 913 ft, and even a typical July afternoon (82 °F) only lifts density altitude to about 2,583 ft — heat still trims performance, but the field rarely turns high-and-hot.

worst typical month: July · ≈2,583 ft station: CHILTON · 3 mi away normals vintage 1991–2020

Typical density altitude by month

From NOAA 1991–2020 monthly normals at CHILTON (3 mi from the field) · standard pressure, dry air
Month Avg temp °F DA at avg temp Afternoon high °F DA on a typical afternoon
January 17.8 −1,688 ft 25.6 −1,129 ft
February 20.8 −1,471 ft 29.4 −860 ft
March 31.6 −706 ft 40.9 −64 ft
April 44.0 147 ft 54.4 843 ft
May 56.4 975 ft 67.4 1,688 ft
June 66.6 1,637 ft 77.3 2,315 ft
July 71.0 1,918 ft 81.6 2,583 ft
August 69.2 1,803 ft 79.6 2,459 ft
September 61.6 1,314 ft 72.5 2,013 ft
October 48.9 477 ft 58.6 1,119 ft
November 36.0 −401 ft 43.9 140 ft
December 24.4 −1,214 ft 31.3 −727 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 11Y

Altimeter-style gauge: field elevation and density altitude needles 03691215 DENSITY ALT ×1,000 FT 2,608 DENSITY ALTITUDE · FEET
field elevation density altitude

DENSITY ALTITUDE 2,608 ft

Field elevation 913 ft — the air behaves like 2,608 ft.

PRESSURE ALT
914 ft
ISA DEVIATION
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RULE-OF-THUMB DA
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AIR DENSITY INDEX
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AIR DENSITY
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WATER · GRAINS/LB
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For training and reference · verify with official sources and your POH before flight · no tool on this site renders a go / no-go judgment

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Frequently asked questions

How high does density altitude get at 11Y in summer?

On a typical July afternoon — around 82 °F at the nearest NOAA normals station — density altitude at Flying Feathers reaches roughly 2,583 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 11Y on an average day?

It swings with the seasons: from roughly −1,688 ft at the coldest month's average temperature to about 1,918 ft at the warmest month's — all from a constant field elevation of 913 ft. The month-by-month table above carries the full year.

What is the field elevation of Flying Feathers?

913 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 11Y (FAA), in Chilton, Wisconsin.