Potosi, Missouri · field elev 959 ft
Density Altitude at Washington County (8WC)
Washington County sits at 959 ft, and even a typical July afternoon (86 °F) only lifts density altitude to about 2,911 ft — heat still trims performance, but the field rarely turns high-and-hot.
Typical density altitude by month
| Month | Avg temp °F | DA at avg temp | Afternoon high °F | DA on a typical afternoon |
|---|---|---|---|---|
| January | 30.5 | −726 ft | 39.6 | −96 ft |
| February | 35.2 | −399 ft | 45.3 | 292 ft |
| March | 44.3 | 224 ft | 55.1 | 946 ft |
| April | 55.3 | 959 ft | 66.3 | 1,674 ft |
| May | 64.1 | 1,533 ft | 74.0 | 2,164 ft |
| June | 72.3 | 2,057 ft | 81.9 | 2,658 ft |
| July | 76.3 | 2,309 ft | 86.0 | 2,911 ft |
| August | 75.1 | 2,234 ft | 85.2 | 2,862 ft |
| September | 67.4 | 1,745 ft | 77.8 | 2,403 ft |
| October | 56.9 | 1,064 ft | 67.5 | 1,751 ft |
| November | 44.7 | 251 ft | 54.1 | 880 ft |
| December | 34.9 | −419 ft | 43.4 | 163 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 8WC
DENSITY ALTITUDE
Field elevation 959 ft — the air behaves like 2,911 ft.
- PRESSURE ALT
- 960 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 Missouri fields
- 1BT — Bonne Terre Municipal
Bonne Terre · elev 910 ft
- H57 — Bismarck Meml
Bismarck · elev 1,038 ft
- KFAM — Farmington Regional
Farmington · elev 946 ft
- KUUV — Sullivan Regional
Sullivan · elev 933 ft
- H88 — A Paul Vance Fredericktown Regional
Fredericktown · elev 880 ft
- KUBX — Cuba Municipal
Cuba · elev 1,023 ft
- KPCD — Perryville Regional
Perryville · elev 373 ft
- KFYG — Washington Regional
Washington · elev 488 ft
Frequently asked questions
How high does density altitude get at 8WC in summer?
On a typical July afternoon — around 86 °F at the nearest NOAA normals station — density altitude at Washington County reaches roughly 2,911 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 8WC on an average day?
It swings with the seasons: from roughly −726 ft at the coldest month's average temperature to about 2,309 ft at the warmest month's — all from a constant field elevation of 959 ft. The month-by-month table above carries the full year.
What is the field elevation of Washington County?
959 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 8WC (FAA), in Potosi, Missouri.