Big Falls, Minnesota · field elev 1,233 ft
Density Altitude at Big Falls Municipal (7Y9)
Big Falls Municipal sits at 1,233 ft, and even a typical July afternoon (77 °F) only lifts density altitude to about 2,657 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 | 4.9 | −2,232 ft | 14.8 | −1,503 ft |
| February | 10.5 | −1,817 ft | 22.2 | −970 ft |
| March | 24.2 | −827 ft | 35.8 | −16 ft |
| April | 38.5 | 170 ft | 50.4 | 973 ft |
| May | 51.5 | 1,046 ft | 63.8 | 1,850 ft |
| June | 60.7 | 1,650 ft | 72.0 | 2,374 ft |
| July | 65.0 | 1,928 ft | 76.5 | 2,657 ft |
| August | 63.2 | 1,812 ft | 74.6 | 2,538 ft |
| September | 54.5 | 1,245 ft | 65.4 | 1,953 ft |
| October | 41.3 | 361 ft | 50.4 | 973 ft |
| November | 25.3 | −749 ft | 33.4 | −182 ft |
| December | 10.9 | −1,788 ft | 19.3 | −1,177 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 7Y9
DENSITY ALTITUDE
Field elevation 1,233 ft — the air behaves like 2,688 ft.
- PRESSURE ALT
- 1,234 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 Minnesota fields
- 13Y — Littlefork Municipal/Hanover
Littlefork · elev 1,145 ft
- KFOZ — Bigfork Municipal
Bigfork · elev 1,351 ft
- KINL — Falls International/Einarson Field
International Falls · elev 1,184 ft
- 43Y — Northome Municipal
Northome · elev 1,430 ft
- KVWU — Waskish Municipal
Waskish · elev 1,185 ft
- KORB — Orr Regional
Orr · elev 1,313 ft
- 9Y0 — Bowstring
Bowstring · elev 1,372 ft
- KBDE — Baudette International
Baudette · elev 1,085 ft
Frequently asked questions
How high does density altitude get at 7Y9 in summer?
On a typical July afternoon — around 77 °F at the nearest NOAA normals station — density altitude at Big Falls Municipal reaches roughly 2,657 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 7Y9 on an average day?
It swings with the seasons: from roughly −2,232 ft at the coldest month's average temperature to about 1,928 ft at the warmest month's — all from a constant field elevation of 1,233 ft. The month-by-month table above carries the full year.
What is the field elevation of Big Falls Municipal?
1,233 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 7Y9 (FAA), in Big Falls, Minnesota.