Winifred, Montana · field elev 2,950 ft

Density Altitude at Knox Ridge (MT3)

From a field elevation of 2,950 ft, a typical July afternoon at Knox Ridge (86 °F) raises density altitude to about 5,339 ft — solidly into the range where performance charts deserve a close read.

worst typical month: July · ≈5,339 ft station: SAND CREEK · 6 mi away normals vintage 1991–2020

Typical density altitude by month

From NOAA 1991–2020 monthly normals at SAND CREEK (6 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 21.1 1,103 ft 32.7 1,909 ft
February 23.7 1,286 ft 35.6 2,107 ft
March 33.2 1,943 ft 45.0 2,739 ft
April 44.0 2,672 ft 56.2 3,472 ft
May 53.7 3,310 ft 66.3 4,117 ft
June 62.4 3,870 ft 74.6 4,636 ft
July 70.9 4,406 ft 86.1 5,339 ft ▲
August 69.0 4,287 ft 84.2 5,224 ft ▲
September 59.1 3,659 ft 73.6 4,574 ft
October 45.8 2,792 ft 58.8 3,640 ft
November 32.7 1,909 ft 44.5 2,705 ft
December 22.2 1,181 ft 33.3 1,950 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 MT3

Altimeter-style gauge: field elevation and density altitude needles 03691215 DENSITY ALT ×1,000 FT 5,333 DENSITY ALTITUDE · FEET
field elevation density altitude

DENSITY ALTITUDE 5,333 ft caution

Field elevation 2,950 ft — the air behaves like 5,333 ft.

PRESSURE ALT
2,952 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 MT3 in summer?

On a typical July afternoon — around 86 °F at the nearest NOAA normals station — density altitude at Knox Ridge reaches roughly 5,339 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 MT3 on an average day?

It swings with the seasons: from roughly 1,103 ft at the coldest month's average temperature to about 4,406 ft at the warmest month's — all from a constant field elevation of 2,950 ft. The month-by-month table above carries the full year.

What is the field elevation of Knox Ridge?

2,950 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is MT3 (FAA), in Winifred, Montana.