Chatom, Alabama · field elev 166 ft

Density Altitude at Roy Wilcox (5R1)

Roy Wilcox sits at 166 ft, and even a typical July afternoon (92 °F) only lifts density altitude to about 2,312 ft — heat still trims performance, but the field rarely turns high-and-hot.

worst typical month: July · ≈2,312 ft station: CHATOM · 4 mi away normals vintage 1991–2020

Typical density altitude by month

From NOAA 1991–2020 monthly normals at CHATOM (4 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 46.7 −598 ft 59.4 249 ft
February 50.6 −335 ft 64.4 576 ft
March 57.3 111 ft 71.6 1,040 ft
April 63.7 531 ft 78.4 1,470 ft
May 71.7 1,046 ft 85.1 1,888 ft
June 78.0 1,445 ft 90.1 2,196 ft
July 80.5 1,602 ft 92.0 2,312 ft
August 79.9 1,564 ft 91.4 2,275 ft
September 75.4 1,281 ft 87.2 2,018 ft
October 65.1 621 ft 78.8 1,495 ft
November 54.8 −54 ft 68.9 867 ft
December 48.6 −469 ft 61.6 394 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 5R1

Altimeter-style gauge: field elevation and density altitude needles 03691215 DENSITY ALT ×1,000 FT 2,312 DENSITY ALTITUDE · FEET
field elevation density altitude

DENSITY ALTITUDE 2,312 ft

Field elevation 166 ft — the air behaves like 2,312 ft.

PRESSURE ALT
167 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 5R1 in summer?

On a typical July afternoon — around 92 °F at the nearest NOAA normals station — density altitude at Roy Wilcox reaches roughly 2,312 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 5R1 on an average day?

It swings with the seasons: from roughly −598 ft at the coldest month's average temperature to about 1,602 ft at the warmest month's — all from a constant field elevation of 166 ft. The month-by-month table above carries the full year.

What is the field elevation of Roy Wilcox?

166 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 5R1 (FAA), in Chatom, Alabama.