Rockford, Idaho · field elev 4,465 ft
Density Altitude at Rockford Municipal (2U4)
From a field elevation of 4,465 ft, a typical July afternoon at Rockford Municipal (87 °F) raises density altitude to about 7,224 ft — solidly into the range where performance charts deserve a close read.
Typical density altitude by month
| Month | Avg temp °F | DA at avg temp | Afternoon high °F | DA on a typical afternoon |
|---|---|---|---|---|
| January | 24.0 | 3,197 ft | 31.2 | 3,690 ft |
| February | 28.8 | 3,527 ft | 37.0 | 4,081 ft |
| March | 39.0 | 4,214 ft | 48.8 | 4,858 ft |
| April | 46.1 | 4,682 ft | 57.4 | 5,411 ft ▲ |
| May | 55.2 | 5,271 ft | 67.6 | 6,052 ft ▲ |
| June | 63.2 | 5,777 ft | 76.7 | 6,611 ft ▲ |
| July | 71.4 | 6,287 ft | 86.9 | 7,224 ft ▲ |
| August | 70.1 | 6,207 ft | 85.9 | 7,164 ft ▲ |
| September | 60.6 | 5,614 ft | 75.1 | 6,514 ft ▲ |
| October | 47.8 | 4,793 ft | 60.5 | 5,607 ft ▲ |
| November | 35.1 | 3,953 ft | 44.8 | 4,597 ft |
| December | 24.8 | 3,253 ft | 32.1 | 3,751 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 2U4
DENSITY ALTITUDE caution
Field elevation 4,465 ft — the air behaves like 7,230 ft.
- PRESSURE ALT
- 4,467 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 Idaho fields
- U02 — Mccarley Field
Blackfoot · elev 4,492 ft
- KPIH — Pocatello Regional
Pocatello · elev 4,452 ft
- U37 — Midway
Atomic City · elev 5,017 ft
- U36 — Aberdeen Municipal
Aberdeen · elev 4,474 ft
- U01 — Savage Field
American Falls · elev 4,420 ft
- U46 — Big Southern Butte
Atomic City · elev 5,073 ft
- KIDA — Idaho Falls Regional
Idaho Falls · elev 4,744 ft
- U48 — Coxs Well
Atomic City · elev 5,048 ft
Frequently asked questions
How high does density altitude get at 2U4 in summer?
On a typical July afternoon — around 87 °F at the nearest NOAA normals station — density altitude at Rockford Municipal reaches roughly 7,224 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 2U4 on an average day?
It swings with the seasons: from roughly 3,197 ft at the coldest month's average temperature to about 6,287 ft at the warmest month's — all from a constant field elevation of 4,465 ft. The month-by-month table above carries the full year.
What is the field elevation of Rockford Municipal?
4,465 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 2U4 (FAA), in Rockford, Idaho.