Allison, Iowa · field elev 1,053 ft

Density Altitude at Allison Municipal (K98)

Allison Municipal sits at 1,053 ft, and even a typical July afternoon (83 °F) only lifts density altitude to about 2,822 ft — heat still trims performance, but the field rarely turns high-and-hot.

worst typical month: July · ≈2,822 ft station: ALLISON · 1 mi away normals vintage 1991–2020

Typical density altitude by month

From NOAA 1991–2020 monthly normals at ALLISON (1 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 16.2 −1,628 ft 25.0 −996 ft
February 20.5 −1,317 ft 29.4 −685 ft
March 33.7 −385 ft 43.4 280 ft
April 47.2 536 ft 58.5 1,285 ft
May 59.4 1,344 ft 70.2 2,039 ft
June 69.6 2,001 ft 79.8 2,642 ft
July 72.7 2,197 ft 82.7 2,822 ft
August 70.3 2,045 ft 80.4 2,680 ft
September 62.8 1,564 ft 74.3 2,298 ft
October 50.0 724 ft 61.0 1,448 ft
November 34.9 −302 ft 44.3 341 ft
December 22.6 −1,167 ft 30.5 −608 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 K98

Altimeter-style gauge: field elevation and density altitude needles 03691215 DENSITY ALT ×1,000 FT 2,841 DENSITY ALTITUDE · FEET
field elevation density altitude

DENSITY ALTITUDE 2,841 ft

Field elevation 1,053 ft — the air behaves like 2,841 ft.

PRESSURE ALT
1,054 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 K98 in summer?

On a typical July afternoon — around 83 °F at the nearest NOAA normals station — density altitude at Allison Municipal reaches roughly 2,822 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 K98 on an average day?

It swings with the seasons: from roughly −1,628 ft at the coldest month's average temperature to about 2,197 ft at the warmest month's — all from a constant field elevation of 1,053 ft. The month-by-month table above carries the full year.

What is the field elevation of Allison Municipal?

1,053 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is K98 (FAA), in Allison, Iowa.