Plaza, North Dakota · field elev 2,105 ft
Density Altitude at Trulson Field (Y99)
Trulson Field sits at 2,105 ft, and even a typical July afternoon (81 °F) only lifts density altitude to about 3,982 ft — heat still trims performance, but the field rarely turns high-and-hot.
Typical density altitude by month
| Month | Avg temp °F | DA at avg temp | Afternoon high °F | DA on a typical afternoon |
|---|---|---|---|---|
| January | 9.3 | −806 ft | 18.4 | −147 ft |
| February | 13.4 | −507 ft | 22.9 | 173 ft |
| March | 25.6 | 363 ft | 35.2 | 1,029 ft |
| April | 40.5 | 1,390 ft | 51.4 | 2,117 ft |
| May | 53.6 | 2,262 ft | 64.8 | 2,986 ft |
| June | 63.5 | 2,903 ft | 74.0 | 3,567 ft |
| July | 69.1 | 3,259 ft | 80.7 | 3,982 ft |
| August | 68.1 | 3,196 ft | 80.5 | 3,970 ft |
| September | 58.0 | 2,549 ft | 70.1 | 3,322 ft |
| October | 42.8 | 1,545 ft | 53.4 | 2,249 ft |
| November | 27.0 | 461 ft | 36.0 | 1,084 ft |
| December | 14.9 | −399 ft | 23.5 | 215 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 Y99
DENSITY ALTITUDE
Field elevation 2,105 ft — the air behaves like 4,000 ft.
- PRESSURE ALT
- 2,106 ft
- ISA DEVIATION
- —
- RULE-OF-THUMB DA
- —
- AIR DENSITY INDEX
- —
- AIR DENSITY
- —
- WATER · GRAINS/LB
- —
For training and reference · verify with official sources and your POH before flight · no tool on this site renders a go / no-go judgment
Nearby North Dakota fields
- Y74 — Parshall-Hankins
Parshall · elev 2,032 ft
- 05D — New Town Municipal
New Town · elev 1,924 ft
- 08D — Stanley Municipal
Stanley · elev 2,250 ft
- KMOT — Minot International
Minot · elev 1,716 ft
- D05 — Garrison Municipal
Garrison · elev 1,937 ft
- 7K5 — Kenmare Municipal
Kenmare · elev 1,962 ft
- 37N — Garrison Dam Recreational Airpark
Riverdale · elev 1,723 ft
- D60 — Tioga Municipal
Tioga · elev 2,271 ft
Frequently asked questions
How high does density altitude get at Y99 in summer?
On a typical July afternoon — around 81 °F at the nearest NOAA normals station — density altitude at Trulson Field reaches roughly 3,982 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 Y99 on an average day?
It swings with the seasons: from roughly −806 ft at the coldest month's average temperature to about 3,259 ft at the warmest month's — all from a constant field elevation of 2,105 ft. The month-by-month table above carries the full year.
What is the field elevation of Trulson Field?
2,105 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is Y99 (FAA), in Plaza, North Dakota.