Killdeer, North Dakota · field elev 2,249 ft
Density Altitude at Dunn County Weydahl Field (9Y1)
Dunn County Weydahl Field sits at 2,249 ft, and even a typical August afternoon (84 °F) only lifts density altitude to about 4,329 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 | 15.3 | −189 ft | 26.6 | 613 ft |
| February | 18.8 | 62 ft | 30.2 | 864 ft |
| March | 29.8 | 836 ft | 42.1 | 1,676 ft |
| April | 41.6 | 1,643 ft | 55.5 | 2,564 ft |
| May | 53.0 | 2,400 ft | 66.8 | 3,290 ft |
| June | 62.3 | 3,003 ft | 75.7 | 3,849 ft |
| July | 68.9 | 3,423 ft | 83.3 | 4,317 ft |
| August | 67.9 | 3,360 ft | 83.5 | 4,329 ft |
| September | 58.1 | 2,732 ft | 73.1 | 3,687 ft |
| October | 43.5 | 1,771 ft | 56.4 | 2,622 ft |
| November | 29.6 | 822 ft | 41.2 | 1,616 ft |
| December | 19.0 | 76 ft | 29.8 | 836 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 9Y1
DENSITY ALTITUDE
Field elevation 2,249 ft — the air behaves like 4,359 ft.
- PRESSURE ALT
- 2,250 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
- S25 — Watford City Municipal
Watford City · elev 2,135 ft
- 4E8 — Richardton
Richardton · elev 2,498 ft
- KDIK — Dickinson/Theodore Roosevelt Regional
Dickinson · elev 2,592 ft
- 05D — New Town Municipal
New Town · elev 1,924 ft
- 95D — Beulah
Beulah · elev 1,791 ft
- Y74 — Parshall-Hankins
Parshall · elev 2,032 ft
- KHZE — Mercer County Regional
Hazen · elev 1,815 ft
- D57 — Glen Ullin Regional
Glen Ullin · elev 2,091 ft
Frequently asked questions
How high does density altitude get at 9Y1 in summer?
On a typical August afternoon — around 84 °F at the nearest NOAA normals station — density altitude at Dunn County Weydahl Field reaches roughly 4,329 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 9Y1 on an average day?
It swings with the seasons: from roughly −189 ft at the coldest month's average temperature to about 3,423 ft at the warmest month's — all from a constant field elevation of 2,249 ft. The month-by-month table above carries the full year.
What is the field elevation of Dunn County Weydahl Field?
2,249 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 9Y1 (FAA), in Killdeer, North Dakota.