Turtle Lake, North Dakota · field elev 1,916 ft
Density Altitude at Turtle Lake Municipal (91N)
Turtle Lake Municipal sits at 1,916 ft, and even a typical July afternoon (83 °F) only lifts density altitude to about 3,874 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 | 10.6 | −949 ft | 20.1 | −263 ft |
| February | 14.4 | −673 ft | 24.5 | 49 ft |
| March | 26.6 | 197 ft | 37.4 | 944 ft |
| April | 40.7 | 1,169 ft | 53.8 | 2,042 ft |
| May | 53.6 | 2,029 ft | 67.0 | 2,894 ft |
| June | 63.7 | 2,684 ft | 76.2 | 3,473 ft |
| July | 69.6 | 3,059 ft | 82.7 | 3,874 ft |
| August | 68.0 | 2,958 ft | 82.2 | 3,844 ft |
| September | 58.0 | 2,316 ft | 71.9 | 3,204 ft |
| October | 43.5 | 1,358 ft | 55.4 | 2,147 ft |
| November | 28.3 | 316 ft | 38.1 | 992 ft |
| December | 16.0 | −557 ft | 24.7 | 63 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 91N
DENSITY ALTITUDE
Field elevation 1,916 ft — the air behaves like 3,893 ft.
- PRESSURE ALT
- 1,917 ft
- ISA DEVIATION
- —
- RULE-OF-THUMB DA
- —
- AIR DENSITY INDEX
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- 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
- 5C8 — Washburn Municipal
Washburn · elev 1,908 ft
- 7G2 — Mc Clusky Municipal
Mc Clusky · elev 1,900 ft
- 37N — Garrison Dam Recreational Airpark
Riverdale · elev 1,723 ft
- D05 — Garrison Municipal
Garrison · elev 1,937 ft
- KHZE — Mercer County Regional
Hazen · elev 1,815 ft
- 95D — Beulah
Beulah · elev 1,791 ft
- 5H4 — Harvey Municipal
Harvey · elev 1,607 ft
- Y19 — Mandan Regional/Lawler Field
Mandan · elev 1,944 ft
Frequently asked questions
How high does density altitude get at 91N in summer?
On a typical July afternoon — around 83 °F at the nearest NOAA normals station — density altitude at Turtle Lake Municipal reaches roughly 3,874 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 91N on an average day?
It swings with the seasons: from roughly −949 ft at the coldest month's average temperature to about 3,059 ft at the warmest month's — all from a constant field elevation of 1,916 ft. The month-by-month table above carries the full year.
What is the field elevation of Turtle Lake Municipal?
1,916 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 91N (FAA), in Turtle Lake, North Dakota.