Iron River, Wisconsin · field elev 1,134 ft
Density Altitude at Bayfield County (Y77)
Bayfield County sits at 1,134 ft, and even a typical July afternoon (78 °F) only lifts density altitude to about 2,604 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 | 11.0 | −1,905 ft | 20.2 | −1,237 ft |
| February | 15.5 | −1,576 ft | 25.7 | −845 ft |
| March | 27.5 | −718 ft | 37.3 | −36 ft |
| April | 39.6 | 122 ft | 50.2 | 837 ft |
| May | 52.1 | 964 ft | 64.3 | 1,761 ft |
| June | 61.5 | 1,580 ft | 73.3 | 2,335 ft |
| July | 66.5 | 1,902 ft | 77.6 | 2,604 ft |
| August | 64.6 | 1,780 ft | 75.2 | 2,454 ft |
| September | 56.5 | 1,254 ft | 66.7 | 1,915 ft |
| October | 43.9 | 414 ft | 52.9 | 1,017 ft |
| November | 30.6 | −500 ft | 37.7 | −8 ft |
| December | 17.7 | −1,417 ft | 25.2 | −880 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 Y77
DENSITY ALTITUDE
Field elevation 1,134 ft — the air behaves like 2,629 ft.
- PRESSURE ALT
- 1,135 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 Wisconsin fields
- 5G4 — Eau Claire Lakes
Drummond · elev 1,212 ft
- KOLG — Solon Springs Municipal
Solon Springs · elev 1,102 ft
- KASX — John F Kennedy Meml
Ashland · elev 827 ft
- 23W — Cornucopia Field
Cornucopia · elev 757 ft
- 3CU — Cable Union
Cable · elev 1,360 ft
- KSUW — Richard I Bong
Superior · elev 674 ft
- 4R5 — Major Gilbert Field
La Pointe · elev 649 ft
- KHYR — Sawyer County
Hayward · elev 1,216 ft
Frequently asked questions
How high does density altitude get at Y77 in summer?
On a typical July afternoon — around 78 °F at the nearest NOAA normals station — density altitude at Bayfield County reaches roughly 2,604 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 Y77 on an average day?
It swings with the seasons: from roughly −1,905 ft at the coldest month's average temperature to about 1,902 ft at the warmest month's — all from a constant field elevation of 1,134 ft. The month-by-month table above carries the full year.
What is the field elevation of Bayfield County?
1,134 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is Y77 (FAA), in Iron River, Wisconsin.