Polson, Montana · field elev 2,941 ft
Density Altitude at Polson (8S1)
From a field elevation of 2,941 ft, a typical July afternoon at Polson (83 °F) raises density altitude to about 5,128 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 | 27.7 | 1,553 ft | 33.4 | 1,946 ft |
| February | 29.4 | 1,671 ft | 36.9 | 2,184 ft |
| March | 37.8 | 2,245 ft | 47.3 | 2,880 ft |
| April | 44.9 | 2,721 ft | 56.2 | 3,461 ft |
| May | 53.3 | 3,273 ft | 65.8 | 4,075 ft |
| June | 59.8 | 3,693 ft | 72.3 | 4,482 ft |
| July | 68.0 | 4,214 ft | 82.8 | 5,128 ft ▲ |
| August | 67.3 | 4,169 ft | 82.2 | 5,092 ft ▲ |
| September | 58.3 | 3,597 ft | 70.9 | 4,395 ft |
| October | 45.6 | 2,767 ft | 55.6 | 3,422 ft |
| November | 34.3 | 2,007 ft | 41.3 | 2,481 ft |
| December | 27.6 | 1,546 ft | 33.1 | 1,925 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 8S1
DENSITY ALTITUDE caution
Field elevation 2,941 ft — the air behaves like 5,140 ft.
- PRESSURE ALT
- 2,943 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
- 7S0 — Ronan
Ronan · elev 3,086 ft
- S09 — Hot Springs
Hot Springs · elev 2,763 ft
- S04 — Condon Usfs
Condon · elev 3,686 ft
- 52S — St Ignatius
St Ignatius · elev 3,006 ft
- 53U — Ferndale Airfield
Bigfork · elev 3,072 ft
- S27 — Kalispell City
Kalispell · elev 2,932 ft
- 8U4 — Spotted Bear /Usfs/
Spotted Bear · elev 3,672 ft
- S34 — Plains
Plains · elev 2,467 ft
Frequently asked questions
How high does density altitude get at 8S1 in summer?
On a typical July afternoon — around 83 °F at the nearest NOAA normals station — density altitude at Polson reaches roughly 5,128 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 8S1 on an average day?
It swings with the seasons: from roughly 1,546 ft at the coldest month's average temperature to about 4,214 ft at the warmest month's — all from a constant field elevation of 2,941 ft. The month-by-month table above carries the full year.
What is the field elevation of Polson?
2,941 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 8S1 (FAA), in Polson, Montana.