Mineral Point, Wisconsin · field elev 1,171 ft
Density Altitude at Iowa County (KMRJ)
Iowa County sits at 1,171 ft, and even a typical July afternoon (81 °F) only lifts density altitude to about 2,886 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 | 17.4 | −1,392 ft | 26.0 | −777 ft |
| February | 21.4 | −1,105 ft | 30.6 | −454 ft |
| March | 32.9 | −294 ft | 42.8 | 386 ft |
| April | 45.2 | 548 ft | 56.5 | 1,300 ft |
| May | 56.9 | 1,326 ft | 68.3 | 2,063 ft |
| June | 66.8 | 1,967 ft | 77.7 | 2,656 ft |
| July | 70.7 | 2,215 ft | 81.4 | 2,886 ft |
| August | 68.9 | 2,101 ft | 79.6 | 2,774 ft |
| September | 60.9 | 1,587 ft | 72.4 | 2,323 ft |
| October | 48.5 | 770 ft | 59.3 | 1,483 ft |
| November | 35.0 | −148 ft | 43.9 | 460 ft |
| December | 23.4 | −962 ft | 31.1 | −419 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 KMRJ
DENSITY ALTITUDE
Field elevation 1,171 ft — the air behaves like 2,861 ft.
- PRESSURE ALT
- 1,172 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
- KPVB — Platteville Municipal
Platteville · elev 1,025 ft
- KLNR — Tri-County Regional
Lone Rock · elev 717 ft
- 73C — Lancaster Municipal
Lancaster · elev 1,016 ft
- 93C — Richland
Richland Center · elev 742 ft
- KOVS — Boscobel
Boscobel · elev 673 ft
- 91C — Sauk/Prairie
Prairie Du Sac · elev 832 ft
- KEFT — Monroe Municipal
Monroe · elev 1,086 ft
- C29 — Middleton Municipal/Morey Field
Middleton · elev 928 ft
Frequently asked questions
How high does density altitude get at KMRJ in summer?
On a typical July afternoon — around 81 °F at the nearest NOAA normals station — density altitude at Iowa County reaches roughly 2,886 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 KMRJ on an average day?
It swings with the seasons: from roughly −1,392 ft at the coldest month's average temperature to about 2,215 ft at the warmest month's — all from a constant field elevation of 1,171 ft. The month-by-month table above carries the full year.
What is the field elevation of Iowa County?
1,171 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KMRJ (ICAO) / MRJ (FAA), in Mineral Point, Wisconsin.