Geraldine, Montana · field elev 3,185 ft
Density Altitude at Geraldine (5U8)
From a field elevation of 3,185 ft, a typical July afternoon at Geraldine (86 °F) raises density altitude to about 5,636 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 | 25.8 | 1,726 ft | 36.9 | 2,487 ft |
| February | 28.2 | 1,892 ft | 40.1 | 2,702 ft |
| March | 36.5 | 2,460 ft | 49.5 | 3,326 ft |
| April | 45.5 | 3,062 ft | 58.5 | 3,909 ft |
| May | 54.5 | 3,652 ft | 68.2 | 4,525 ft |
| June | 62.4 | 4,159 ft | 76.0 | 5,009 ft ▲ |
| July | 70.6 | 4,675 ft | 86.3 | 5,636 ft ▲ |
| August | 69.4 | 4,600 ft | 86.0 | 5,618 ft ▲ |
| September | 60.1 | 4,012 ft | 75.2 | 4,960 ft |
| October | 47.1 | 3,168 ft | 60.3 | 4,025 ft |
| November | 35.1 | 2,365 ft | 46.4 | 3,122 ft |
| December | 27.1 | 1,816 ft | 38.7 | 2,608 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 5U8
DENSITY ALTITUDE caution
Field elevation 3,185 ft — the air behaves like 5,618 ft.
- PRESSURE ALT
- 3,187 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 Montana fields
- 5U0 — Denton
Denton · elev 3,594 ft
- 79S — Fort Benton
Fort Benton · elev 2,869 ft
- S64 — Stanford/Biggerstaff Field
Stanford · elev 4,328 ft
- 3U8 — Big Sandy
Big Sandy · elev 2,699 ft
- 9S7 — Winifred
Winifred · elev 3,354 ft
- KGTF — Great Falls International
Great Falls · elev 3,680 ft
- KLWT — Lewistown Municipal
Lewistown · elev 4,170 ft
- BB0 — Black Butte North
Winifred · elev 3,150 ft
Frequently asked questions
How high does density altitude get at 5U8 in summer?
On a typical July afternoon — around 86 °F at the nearest NOAA normals station — density altitude at Geraldine reaches roughly 5,636 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 5U8 on an average day?
It swings with the seasons: from roughly 1,726 ft at the coldest month's average temperature to about 4,675 ft at the warmest month's — all from a constant field elevation of 3,185 ft. The month-by-month table above carries the full year.
What is the field elevation of Geraldine?
3,185 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 5U8 (FAA), in Geraldine, Montana.