Savanna, Illinois · field elev 616 ft
Density Altitude at Tri-Township (KSFY)
Tri-Township sits at 616 ft, and even a typical July afternoon (85 °F) only lifts density altitude to about 2,425 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 | 20.8 | −1,844 ft | 30.7 | −1,140 ft |
| February | 24.8 | −1,558 ft | 35.3 | −819 ft |
| March | 36.6 | −729 ft | 47.5 | 15 ft |
| April | 48.2 | 62 ft | 60.6 | 883 ft |
| May | 59.8 | 831 ft | 72.3 | 1,636 ft |
| June | 69.4 | 1,452 ft | 81.7 | 2,227 ft |
| July | 72.6 | 1,655 ft | 84.9 | 2,425 ft |
| August | 70.7 | 1,535 ft | 83.3 | 2,326 ft |
| September | 63.3 | 1,059 ft | 76.9 | 1,927 ft |
| October | 51.1 | 256 ft | 63.9 | 1,098 ft |
| November | 38.0 | −633 ft | 48.5 | 82 ft |
| December | 26.4 | −1,444 ft | 35.8 | −785 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 KSFY
DENSITY ALTITUDE
Field elevation 616 ft — the air behaves like 2,431 ft.
- PRESSURE ALT
- 617 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 Illinois fields
- KFEP — Albertus
Freeport · elev 859 ft
- KSQI — Whiteside County/Jos H Bittorf Field
Sterling/Rockfalls · elev 648 ft
- C55 — Ogle County
Mount Morris · elev 929 ft
- C73 — Dixon Municipal-Charles R Walgreen Field
Dixon · elev 785 ft
- 3G8 — Gen-Airpark
Geneseo · elev 645 ft
- KMLI — Quad Cities International
Moline · elev 590 ft
- 1C8 — Cottonwood
Rockford · elev 741 ft
- KRFD — Chicago/Rockford International
Chicago/Rockford · elev 742 ft
Frequently asked questions
How high does density altitude get at KSFY in summer?
On a typical July afternoon — around 85 °F at the nearest NOAA normals station — density altitude at Tri-Township reaches roughly 2,425 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 KSFY on an average day?
It swings with the seasons: from roughly −1,844 ft at the coldest month's average temperature to about 1,655 ft at the warmest month's — all from a constant field elevation of 616 ft. The month-by-month table above carries the full year.
What is the field elevation of Tri-Township?
616 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KSFY (ICAO) / SFY (FAA), in Savanna, Illinois.