Rigby, Idaho · field elev 4,845 ft
Density Altitude at Rigby (U56)
From a field elevation of 4,845 ft, a typical July afternoon at Rigby (85 °F) raises density altitude to about 7,541 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 | 22.8 | 3,588 ft | 30.7 | 4,128 ft |
| February | 26.6 | 3,849 ft | 35.4 | 4,444 ft |
| March | 37.7 | 4,598 ft | 47.9 | 5,268 ft ▲ |
| April | 45.0 | 5,079 ft | 57.1 | 5,858 ft ▲ |
| May | 54.1 | 5,667 ft | 66.7 | 6,460 ft ▲ |
| June | 61.6 | 6,142 ft | 75.0 | 6,970 ft ▲ |
| July | 69.5 | 6,633 ft | 84.5 | 7,541 ft ▲ |
| August | 68.9 | 6,596 ft | 84.3 | 7,530 ft ▲ |
| September | 60.5 | 6,073 ft | 74.9 | 6,964 ft ▲ |
| October | 47.2 | 5,222 ft | 59.7 | 6,022 ft ▲ |
| November | 34.2 | 4,364 ft | 43.1 | 4,955 ft |
| December | 22.8 | 3,588 ft | 29.9 | 4,074 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 U56
DENSITY ALTITUDE caution
Field elevation 4,845 ft — the air behaves like 7,571 ft.
- PRESSURE ALT
- 4,847 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
- KIDA — Idaho Falls Regional
Idaho Falls · elev 4,744 ft
- KRXE — Rexburg-Madison County
Rexburg · elev 4,862 ft
- U12 — Stanford Field
St Anthony · elev 4,966 ft
- 1U2 — Mud Lake/West Jefferson County
Mud Lake · elev 4,795 ft
- U02 — Mccarley Field
Blackfoot · elev 4,492 ft
- U41 — Dubois Municipal
Dubois · elev 5,123 ft
- KDIJ — Driggs/Reed Meml
Driggs · elev 6,257 ft
- 2U4 — Rockford Municipal
Rockford · elev 4,465 ft
Frequently asked questions
How high does density altitude get at U56 in summer?
On a typical July afternoon — around 85 °F at the nearest NOAA normals station — density altitude at Rigby reaches roughly 7,541 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 U56 on an average day?
It swings with the seasons: from roughly 3,588 ft at the coldest month's average temperature to about 6,633 ft at the warmest month's — all from a constant field elevation of 4,845 ft. The month-by-month table above carries the full year.
What is the field elevation of Rigby?
4,845 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is U56 (FAA), in Rigby, Idaho.