Ladysmith, Wisconsin · field elev 1,240 ft
Density Altitude at Rusk County (KRCX)
Rusk County sits at 1,240 ft, and even a typical July afternoon (79 °F) only lifts density altitude to about 2,834 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 | 11.8 | −1,713 ft | 21.6 | −1,004 ft |
| February | 15.7 | −1,429 ft | 27.3 | −599 ft |
| March | 27.9 | −557 ft | 38.9 | 206 ft |
| April | 42.2 | 431 ft | 52.9 | 1,148 ft |
| May | 55.1 | 1,293 ft | 66.1 | 2,007 ft |
| June | 64.9 | 1,930 ft | 75.2 | 2,584 ft |
| July | 68.8 | 2,179 ft | 79.2 | 2,834 ft |
| August | 66.7 | 2,045 ft | 77.4 | 2,721 ft |
| September | 58.5 | 1,515 ft | 69.4 | 2,217 ft |
| October | 45.8 | 674 ft | 55.5 | 1,319 ft |
| November | 31.9 | −277 ft | 39.8 | 268 ft |
| December | 18.9 | −1,197 ft | 27.1 | −613 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 KRCX
DENSITY ALTITUDE
Field elevation 1,240 ft — the air behaves like 2,821 ft.
- PRESSURE ALT
- 1,241 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
- KPBH — Price County
Phillips · elev 1,497 ft
- Y23 — Chetek Municipal/Southworth
Chetek · elev 1,056 ft
- 5N2 — Prentice
Prentice · elev 1,579 ft
- KRPD — Rice Lake Regional/Carl'S Field
Rice Lake · elev 1,109 ft
- 9Y7 — Barron Municipal
Barron · elev 1,110 ft
- KPKF — Park Falls Municipal
Park Falls · elev 1,501 ft
- KHYR — Sawyer County
Hayward · elev 1,216 ft
- KMDZ — Taylor County
Medford · elev 1,478 ft
Frequently asked questions
How high does density altitude get at KRCX in summer?
On a typical July afternoon — around 79 °F at the nearest NOAA normals station — density altitude at Rusk County reaches roughly 2,834 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 KRCX on an average day?
It swings with the seasons: from roughly −1,713 ft at the coldest month's average temperature to about 2,179 ft at the warmest month's — all from a constant field elevation of 1,240 ft. The month-by-month table above carries the full year.
What is the field elevation of Rusk County?
1,240 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KRCX (ICAO) / RCX (FAA), in Ladysmith, Wisconsin.