Mud Lake, Idaho · field elev 4,795 ft
Density Altitude at Mud Lake/West Jefferson County (1U2)
From a field elevation of 4,795 ft, a typical August afternoon at Mud Lake/West Jefferson County (85 °F) raises density altitude to about 7,481 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 | 16.2 | 3,066 ft | 27.1 | 3,821 ft |
| February | 20.5 | 3,366 ft | 32.2 | 4,167 ft |
| March | 32.8 | 4,208 ft | 45.6 | 5,057 ft ▲ |
| April | 42.9 | 4,880 ft | 57.8 | 5,841 ft ▲ |
| May | 51.9 | 5,465 ft | 66.6 | 6,393 ft ▲ |
| June | 58.7 | 5,898 ft | 74.9 | 6,903 ft ▲ |
| July | 66.2 | 6,368 ft | 84.3 | 7,469 ft ▲ |
| August | 65.4 | 6,318 ft | 84.5 | 7,481 ft ▲ |
| September | 56.4 | 5,752 ft | 74.9 | 6,903 ft ▲ |
| October | 42.7 | 4,867 ft | 58.2 | 5,866 ft ▲ |
| November | 28.9 | 3,944 ft | 40.8 | 4,741 ft |
| December | 17.5 | 3,157 ft | 28.1 | 3,889 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 1U2
DENSITY ALTITUDE caution
Field elevation 4,795 ft — the air behaves like 7,511 ft.
- PRESSURE ALT
- 4,797 ft
- ISA DEVIATION
- —
- RULE-OF-THUMB DA
- —
- AIR DENSITY INDEX
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- 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
- U41 — Dubois Municipal
Dubois · elev 5,123 ft
- U97 — Howe
Howe · elev 4,930 ft
- U37 — Midway
Atomic City · elev 5,017 ft
- KIDA — Idaho Falls Regional
Idaho Falls · elev 4,744 ft
- U56 — Rigby
Rigby · elev 4,845 ft
- KRXE — Rexburg-Madison County
Rexburg · elev 4,862 ft
- U46 — Big Southern Butte
Atomic City · elev 5,073 ft
- U12 — Stanford Field
St Anthony · elev 4,966 ft
Frequently asked questions
How high does density altitude get at 1U2 in summer?
On a typical August afternoon — around 85 °F at the nearest NOAA normals station — density altitude at Mud Lake/West Jefferson County reaches roughly 7,481 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 1U2 on an average day?
It swings with the seasons: from roughly 3,066 ft at the coldest month's average temperature to about 6,368 ft at the warmest month's — all from a constant field elevation of 4,795 ft. The month-by-month table above carries the full year.
What is the field elevation of Mud Lake/West Jefferson County?
4,795 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 1U2 (FAA), in Mud Lake, Idaho.