Spencer, West Virginia · field elev 1,001 ft
Density Altitude at Slate Run (55I)
Slate Run sits at 1,001 ft, and even a typical July afternoon (83 °F) only lifts density altitude to about 2,796 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 | 30.8 | −652 ft | 39.6 | −43 ft |
| February | 33.4 | −471 ft | 43.3 | 209 ft |
| March | 41.3 | 73 ft | 52.8 | 846 ft |
| April | 52.0 | 793 ft | 65.3 | 1,662 ft |
| May | 60.9 | 1,377 ft | 73.1 | 2,159 ft |
| June | 68.8 | 1,886 ft | 80.2 | 2,604 ft |
| July | 72.5 | 2,121 ft | 83.3 | 2,796 ft |
| August | 71.3 | 2,045 ft | 82.7 | 2,759 ft |
| September | 65.2 | 1,655 ft | 77.3 | 2,423 ft |
| October | 53.7 | 905 ft | 66.1 | 1,713 ft |
| November | 42.7 | 168 ft | 53.9 | 918 ft |
| December | 35.2 | −346 ft | 43.8 | 243 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 55I
DENSITY ALTITUDE
Field elevation 1,001 ft — the air behaves like 2,777 ft.
- PRESSURE ALT
- 1,002 ft
- ISA DEVIATION
- —
- RULE-OF-THUMB DA
- —
- AIR DENSITY INDEX
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- AIR DENSITY
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- 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 West Virginia fields
- KUSW — Boggs Field
Spencer · elev 928 ft
- I18 — Jackson County
Ravenswood · elev 758 ft
- KCRW — West Virginia International Yeager
Charleston · elev 947 ft
- 48I — Braxton County
Sutton · elev 1,276 ft
- KPKB — Mid-Ohio Valley Regional
Parkersburg · elev 859 ft
- 3I2 — Mason County
Point Pleasant · elev 643 ft
- KSXL — Summersville
Summersville · elev 1,820 ft
- 3I4 — Richwood Municipal
Richwood · elev 2,486 ft
Frequently asked questions
How high does density altitude get at 55I in summer?
On a typical July afternoon — around 83 °F at the nearest NOAA normals station — density altitude at Slate Run reaches roughly 2,796 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 55I on an average day?
It swings with the seasons: from roughly −652 ft at the coldest month's average temperature to about 2,121 ft at the warmest month's — all from a constant field elevation of 1,001 ft. The month-by-month table above carries the full year.
What is the field elevation of Slate Run?
1,001 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 55I (FAA), in Spencer, West Virginia.