Portage, Wisconsin · field elev 825 ft

Density Altitude at Portage Municipal (C47)

Portage Municipal sits at 825 ft, and even a typical July afternoon (82 °F) only lifts density altitude to about 2,476 ft — heat still trims performance, but the field rarely turns high-and-hot.

worst typical month: July · ≈2,476 ft station: PORTAGE WWTP · 3 mi away normals vintage 1991–2020

Typical density altitude by month

From NOAA 1991–2020 monthly normals at PORTAGE WWTP (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 18.0 −1,784 ft 26.1 −1,203 ft
February 21.9 −1,503 ft 30.6 −886 ft
March 33.2 −705 ft 42.4 −71 ft
April 45.8 159 ft 55.7 820 ft
May 58.0 971 ft 68.2 1,632 ft
June 67.9 1,612 ft 77.9 2,245 ft
July 71.6 1,848 ft 81.6 2,476 ft
August 69.6 1,721 ft 79.9 2,370 ft
September 61.6 1,206 ft 72.6 1,912 ft
October 49.2 388 ft 59.3 1,056 ft
November 36.3 −489 ft 44.2 51 ft
December 24.4 −1,324 ft 31.8 −802 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 C47

Altimeter-style gauge: field elevation and density altitude needles 03691215 DENSITY ALT ×1,000 FT 2,501 DENSITY ALTITUDE · FEET
field elevation density altitude

DENSITY ALTITUDE 2,501 ft

Field elevation 825 ft — the air behaves like 2,501 ft.

PRESSURE ALT
826 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 C47 in summer?

On a typical July afternoon — around 82 °F at the nearest NOAA normals station — density altitude at Portage Municipal reaches roughly 2,476 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 C47 on an average day?

It swings with the seasons: from roughly −1,784 ft at the coldest month's average temperature to about 1,848 ft at the warmest month's — all from a constant field elevation of 825 ft. The month-by-month table above carries the full year.

What is the field elevation of Portage Municipal?

825 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is C47 (FAA), in Portage, Wisconsin.