Carrabassett, Maine · field elev 880 ft

Density Altitude at Sugarloaf Regional (B21)

Sugarloaf Regional sits at 880 ft, and even a typical July afternoon (77 °F) only lifts density altitude to about 2,237 ft — heat still trims performance, but the field rarely turns high-and-hot.

worst typical month: July · ≈2,237 ft station: LONG FALLS DAM · 9 mi away normals vintage 1991–2020

Typical density altitude by month

From NOAA 1991–2020 monthly normals at LONG FALLS DAM (9 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 13.7 −2,028 ft 23.2 −1,341 ft
February 15.5 −1,896 ft 26.2 −1,128 ft
March 24.4 −1,255 ft 34.7 −532 ft
April 37.6 −331 ft 47.3 329 ft
May 51.0 576 ft 62.1 1,306 ft
June 60.6 1,209 ft 71.5 1,909 ft
July 65.9 1,552 ft 76.7 2,237 ft
August 64.2 1,442 ft 75.5 2,162 ft
September 56.8 960 ft 68.1 1,693 ft
October 44.6 147 ft 53.7 756 ft
November 32.8 −664 ft 40.4 −139 ft
December 21.4 −1,470 ft 29.2 −916 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 B21

Altimeter-style gauge: field elevation and density altitude needles 03691215 DENSITY ALT ×1,000 FT 2,256 DENSITY ALTITUDE · FEET
field elevation density altitude

DENSITY ALTITUDE 2,256 ft

Field elevation 880 ft — the air behaves like 2,256 ft.

PRESSURE ALT
881 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 B21 in summer?

On a typical July afternoon — around 77 °F at the nearest NOAA normals station — density altitude at Sugarloaf Regional reaches roughly 2,237 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 B21 on an average day?

It swings with the seasons: from roughly −2,028 ft at the coldest month's average temperature to about 1,552 ft at the warmest month's — all from a constant field elevation of 880 ft. The month-by-month table above carries the full year.

What is the field elevation of Sugarloaf Regional?

880 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is B21 (FAA), in Carrabassett, Maine.