Lumberton, Mississippi · field elev 310 ft

Density Altitude at I H Bass Jr Meml (4R1)

I H Bass Jr Meml sits at 310 ft, and even a typical August afternoon (91 °F) only lifts density altitude to about 2,426 ft — heat still trims performance, but the field rarely turns high-and-hot.

worst typical month: August · ≈2,426 ft station: POPLARVILLE EXP STN · 13 mi away normals vintage 1991–2020

Typical density altitude by month

From NOAA 1991–2020 monthly normals at POPLARVILLE EXP STN (13 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 49.0 −264 ft 59.3 421 ft
February 52.6 −23 ft 63.4 688 ft
March 59.1 408 ft 70.3 1,133 ft
April 65.4 818 ft 76.8 1,546 ft
May 73.1 1,312 ft 84.1 2,002 ft
June 79.0 1,684 ft 89.4 2,328 ft
July 80.8 1,797 ft 90.8 2,414 ft
August 80.7 1,791 ft 91.0 2,426 ft
September 76.6 1,533 ft 87.0 2,181 ft
October 67.4 947 ft 78.8 1,672 ft
November 57.2 282 ft 68.3 1,005 ft
December 51.0 −130 ft 61.2 545 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 4R1

Altimeter-style gauge: field elevation and density altitude needles 03691215 DENSITY ALT ×1,000 FT 2,426 DENSITY ALTITUDE · FEET
field elevation density altitude

DENSITY ALTITUDE 2,426 ft

Field elevation 310 ft — the air behaves like 2,426 ft.

PRESSURE ALT
311 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 4R1 in summer?

On a typical August afternoon — around 91 °F at the nearest NOAA normals station — density altitude at I H Bass Jr Meml reaches roughly 2,426 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 4R1 on an average day?

It swings with the seasons: from roughly −264 ft at the coldest month's average temperature to about 1,797 ft at the warmest month's — all from a constant field elevation of 310 ft. The month-by-month table above carries the full year.

What is the field elevation of I H Bass Jr Meml?

310 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 4R1 (FAA), in Lumberton, Mississippi.