Decatur, Texas · field elev 1,010 ft

Density Altitude at Triple-Ace Field (35X)

Triple-Ace Field sits at 1,010 ft, and even a typical July afternoon (95 °F) only lifts density altitude to about 3,543 ft — heat still trims performance, but the field rarely turns high-and-hot.

worst typical month: July · ≈3,543 ft station: DECATUR · 4 mi away normals vintage 1991–2020

Typical density altitude by month

From NOAA 1991–2020 monthly normals at DECATUR (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 44.7 315 ft 56.2 1,081 ft
February 48.3 557 ft 60.1 1,336 ft
March 56.2 1,081 ft 68.1 1,852 ft
April 64.1 1,596 ft 75.7 2,334 ft
May 72.5 2,132 ft 82.7 2,770 ft
June 80.6 2,640 ft 90.8 3,266 ft
July 84.7 2,893 ft 95.4 3,543 ft
August 84.1 2,856 ft 94.9 3,513 ft
September 76.7 2,396 ft 88.5 3,126 ft
October 66.2 1,731 ft 78.6 2,515 ft
November 55.0 1,002 ft 66.9 1,776 ft
December 46.6 443 ft 58.0 1,199 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 35X

Altimeter-style gauge: field elevation and density altitude needles 03691215 DENSITY ALT ×1,000 FT 3,519 DENSITY ALTITUDE · FEET
field elevation density altitude

DENSITY ALTITUDE 3,519 ft

Field elevation 1,010 ft — the air behaves like 3,519 ft.

PRESSURE ALT
1,011 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 35X in summer?

On a typical July afternoon — around 95 °F at the nearest NOAA normals station — density altitude at Triple-Ace Field reaches roughly 3,543 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 35X on an average day?

It swings with the seasons: from roughly 315 ft at the coldest month's average temperature to about 2,893 ft at the warmest month's — all from a constant field elevation of 1,010 ft. The month-by-month table above carries the full year.

What is the field elevation of Triple-Ace Field?

1,010 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 35X (FAA), in Decatur, Texas.