Riverdale, North Dakota · field elev 1,723 ft
Density Altitude at Garrison Dam Recreational Airpark (37N)
Garrison Dam Recreational Airpark sits at 1,723 ft, and even a typical July afternoon (81 °F) only lifts density altitude to about 3,516 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 | 11.7 | −1,112 ft | 20.2 | −498 ft |
| February | 15.1 | −865 ft | 23.5 | −263 ft |
| March | 27.3 | 5 ft | 36.7 | 656 ft |
| April | 41.5 | 983 ft | 52.3 | 1,705 ft |
| May | 53.5 | 1,784 ft | 65.1 | 2,536 ft |
| June | 63.5 | 2,434 ft | 74.1 | 3,106 ft |
| July | 69.6 | 2,822 ft | 80.7 | 3,516 ft |
| August | 68.3 | 2,740 ft | 79.9 | 3,467 ft |
| September | 59.4 | 2,169 ft | 71.1 | 2,917 ft |
| October | 44.7 | 1,199 ft | 53.8 | 1,804 ft |
| November | 29.2 | 138 ft | 37.4 | 704 ft |
| December | 18.1 | −648 ft | 24.7 | −178 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 37N
DENSITY ALTITUDE
Field elevation 1,723 ft — the air behaves like 3,535 ft.
- PRESSURE ALT
- 1,724 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
- D05 — Garrison Municipal
Garrison · elev 1,937 ft
- KHZE — Mercer County Regional
Hazen · elev 1,815 ft
- 5C8 — Washburn Municipal
Washburn · elev 1,908 ft
- 91N — Turtle Lake Municipal
Turtle Lake · elev 1,916 ft
- 95D — Beulah
Beulah · elev 1,791 ft
- 7G2 — Mc Clusky Municipal
Mc Clusky · elev 1,900 ft
- Y99 — Trulson Field
Plaza · elev 2,105 ft
- Y74 — Parshall-Hankins
Parshall · elev 2,032 ft
Frequently asked questions
How high does density altitude get at 37N in summer?
On a typical July afternoon — around 81 °F at the nearest NOAA normals station — density altitude at Garrison Dam Recreational Airpark reaches roughly 3,516 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 37N on an average day?
It swings with the seasons: from roughly −1,112 ft at the coldest month's average temperature to about 2,822 ft at the warmest month's — all from a constant field elevation of 1,723 ft. The month-by-month table above carries the full year.
What is the field elevation of Garrison Dam Recreational Airpark?
1,723 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 37N (FAA), in Riverdale, North Dakota.