Ottawa, Illinois · field elev 616 ft

Density Altitude at Skydive Chicago (8N2)

Skydive Chicago sits at 616 ft, and even a typical July afternoon (84 °F) only lifts density altitude to about 2,369 ft — heat still trims performance, but the field rarely turns high-and-hot.

worst typical month: July · ≈2,369 ft station: MARSEILLES LOCK · 5 mi away normals vintage 1991–2020

Typical density altitude by month

From NOAA 1991–2020 monthly normals at MARSEILLES LOCK (5 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 22.8 −1,701 ft 31.4 −1,091 ft
February 26.3 −1,451 ft 35.4 −812 ft
March 37.3 −681 ft 47.5 15 ft
April 49.2 129 ft 61.2 922 ft
May 60.5 877 ft 72.6 1,655 ft
June 69.6 1,464 ft 81.1 2,189 ft
July 73.0 1,681 ft 84.0 2,369 ft
August 71.5 1,585 ft 82.4 2,270 ft
September 65.0 1,169 ft 77.1 1,939 ft
October 52.7 363 ft 64.1 1,111 ft
November 39.6 −523 ft 49.1 122 ft
December 28.5 −1,295 ft 36.6 −729 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 8N2

Altimeter-style gauge: field elevation and density altitude needles 03691215 DENSITY ALT ×1,000 FT 2,369 DENSITY ALTITUDE · FEET
field elevation density altitude

DENSITY ALTITUDE 2,369 ft

Field elevation 616 ft — the air behaves like 2,369 ft.

PRESSURE ALT
617 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 8N2 in summer?

On a typical July afternoon — around 84 °F at the nearest NOAA normals station — density altitude at Skydive Chicago reaches roughly 2,369 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 8N2 on an average day?

It swings with the seasons: from roughly −1,701 ft at the coldest month's average temperature to about 1,681 ft at the warmest month's — all from a constant field elevation of 616 ft. The month-by-month table above carries the full year.

What is the field elevation of Skydive Chicago?

616 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 8N2 (FAA), in Ottawa, Illinois.