Williamson/Sodus, New York · field elev 424 ft
Density Altitude at Williamson/Sodus (KSDC)
Williamson/Sodus sits at 424 ft, and even a typical July afternoon (79 °F) only lifts density altitude to about 1,836 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 | 23.4 | −1,899 ft | 30.9 | −1,366 ft |
| February | 24.7 | −1,806 ft | 32.8 | −1,233 ft |
| March | 32.5 | −1,254 ft | 41.4 | −638 ft |
| April | 44.2 | −447 ft | 54.4 | 238 ft |
| May | 55.6 | 318 ft | 66.7 | 1,042 ft |
| June | 64.5 | 900 ft | 75.2 | 1,585 ft |
| July | 69.0 | 1,190 ft | 79.2 | 1,836 ft |
| August | 67.8 | 1,113 ft | 77.8 | 1,748 ft |
| September | 61.2 | 686 ft | 71.7 | 1,363 ft |
| October | 49.7 | −75 ft | 58.7 | 522 ft |
| November | 39.0 | −803 ft | 46.9 | −264 ft |
| December | 29.4 | −1,472 ft | 36.2 | −996 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 KSDC
DENSITY ALTITUDE
Field elevation 424 ft — the air behaves like 1,824 ft.
- PRESSURE ALT
- 425 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
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- 0G7 — Finger Lakes Regional
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- B16 — Whitfords
Weedsport · elev 400 ft
- D91 — Spencerport Airpark
Spencerport · elev 614 ft
- 4N2 — Middlesex Valley
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- KFZY — Oswego County
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Frequently asked questions
How high does density altitude get at KSDC in summer?
On a typical July afternoon — around 79 °F at the nearest NOAA normals station — density altitude at Williamson/Sodus reaches roughly 1,836 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 KSDC on an average day?
It swings with the seasons: from roughly −1,899 ft at the coldest month's average temperature to about 1,190 ft at the warmest month's — all from a constant field elevation of 424 ft. The month-by-month table above carries the full year.
What is the field elevation of Williamson/Sodus?
424 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KSDC (ICAO) / SDC (FAA), in Williamson/Sodus, New York.