Cairo, Illinois · field elev 322 ft

Density Altitude at Cairo Regional (KCIR)

Cairo Regional sits at 322 ft, and even a typical July afternoon (89 °F) only lifts density altitude to about 2,300 ft — heat still trims performance, but the field rarely turns high-and-hot.

worst typical month: July · ≈2,300 ft station: CAIRO 3N · 2 mi away normals vintage 1991–2020

Typical density altitude by month

From NOAA 1991–2020 monthly normals at CAIRO 3N (2 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 34.7 −1,228 ft 43.4 −628 ft
February 38.9 −937 ft 48.2 −303 ft
March 48.1 −310 ft 58.6 389 ft
April 58.7 396 ft 69.9 1,122 ft
May 68.0 1,001 ft 78.3 1,655 ft
June 76.0 1,510 ft 85.9 2,128 ft
July 79.2 1,711 ft 88.7 2,300 ft
August 77.6 1,611 ft 87.8 2,245 ft
September 70.6 1,167 ft 81.7 1,868 ft
October 59.3 435 ft 70.9 1,186 ft
November 47.6 −343 ft 57.9 343 ft
December 38.4 −971 ft 46.7 −404 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 KCIR

Altimeter-style gauge: field elevation and density altitude needles 03691215 DENSITY ALT ×1,000 FT 2,319 DENSITY ALTITUDE · FEET
field elevation density altitude

DENSITY ALTITUDE 2,319 ft

Field elevation 322 ft — the air behaves like 2,319 ft.

PRESSURE ALT
323 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

Nearby Illinois fields

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Frequently asked questions

How high does density altitude get at KCIR in summer?

On a typical July afternoon — around 89 °F at the nearest NOAA normals station — density altitude at Cairo Regional reaches roughly 2,300 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 KCIR on an average day?

It swings with the seasons: from roughly −1,228 ft at the coldest month's average temperature to about 1,711 ft at the warmest month's — all from a constant field elevation of 322 ft. The month-by-month table above carries the full year.

What is the field elevation of Cairo Regional?

322 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KCIR (ICAO) / CIR (FAA), in Cairo, Illinois.