Bolingbrook, Illinois · field elev 675 ft

Density Altitude at Bolingbrook'S Clow International (1C5)

Bolingbrook'S Clow International sits at 675 ft, and even a typical July afternoon (85 °F) only lifts density altitude to about 2,484 ft — heat still trims performance, but the field rarely turns high-and-hot.

worst typical month: July · ≈2,484 ft station: ROMEOVILLE WFO · 7 mi away normals vintage 1991–2020

Typical density altitude by month

From NOAA 1991–2020 monthly normals at ROMEOVILLE WFO (7 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 23.9 −1,548 ft 31.7 −997 ft
February 28.0 −1,257 ft 36.3 −676 ft
March 39.1 −483 ft 48.5 155 ft
April 50.3 276 ft 61.0 982 ft
May 61.4 1,008 ft 72.4 1,715 ft
June 70.9 1,620 ft 81.5 2,286 ft
July 74.6 1,854 ft 84.7 2,484 ft
August 72.8 1,740 ft 82.7 2,361 ft
September 65.9 1,299 ft 76.4 1,968 ft
October 53.7 502 ft 63.8 1,164 ft
November 40.4 −394 ft 48.9 182 ft
December 29.4 −1,158 ft 36.8 −642 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 1C5

Altimeter-style gauge: field elevation and density altitude needles 03691215 DENSITY ALT ×1,000 FT 2,503 DENSITY ALTITUDE · FEET
field elevation density altitude

DENSITY ALTITUDE 2,503 ft

Field elevation 675 ft — the air behaves like 2,503 ft.

PRESSURE ALT
676 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 1C5 in summer?

On a typical July afternoon — around 85 °F at the nearest NOAA normals station — density altitude at Bolingbrook'S Clow International reaches roughly 2,484 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 1C5 on an average day?

It swings with the seasons: from roughly −1,548 ft at the coldest month's average temperature to about 1,854 ft at the warmest month's — all from a constant field elevation of 675 ft. The month-by-month table above carries the full year.

What is the field elevation of Bolingbrook'S Clow International?

675 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 1C5 (FAA), in Bolingbrook, Illinois.