Dixon, Illinois · field elev 785 ft
Density Altitude at Dixon Municipal-Charles R Walgreen Field (C73)
Dixon Municipal-Charles R Walgreen Field sits at 785 ft, and even a typical July afternoon (83 °F) only lifts density altitude to about 2,495 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 | 21.3 | −1,596 ft | 29.0 | −1,049 ft |
| February | 25.5 | −1,296 ft | 33.6 | −727 ft |
| March | 37.3 | −470 ft | 46.3 | 143 ft |
| April | 49.4 | 352 ft | 59.9 | 1,046 ft |
| May | 60.9 | 1,111 ft | 71.0 | 1,761 ft |
| June | 70.2 | 1,710 ft | 79.8 | 2,315 ft |
| July | 73.5 | 1,920 ft | 82.7 | 2,495 ft |
| August | 71.9 | 1,818 ft | 81.4 | 2,415 ft |
| September | 64.6 | 1,351 ft | 75.3 | 2,033 ft |
| October | 52.4 | 552 ft | 62.8 | 1,235 ft |
| November | 39.0 | −353 ft | 47.6 | 231 ft |
| December | 27.3 | −1,169 ft | 34.5 | −664 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 C73
DENSITY ALTITUDE
Field elevation 785 ft — the air behaves like 2,514 ft.
- PRESSURE ALT
- 786 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
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- C82 — Bresson
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- KRPJ — Rochelle Municipal/Koritz Field
Rochelle · elev 781 ft
- KFEP — Albertus
Freeport · elev 859 ft
- KRFD — Chicago/Rockford International
Chicago/Rockford · elev 742 ft
- 1C8 — Cottonwood
Rockford · elev 741 ft
- KVYS — Illinois Valley Regional-Walter A Duncan Field
Peru · elev 654 ft
Frequently asked questions
How high does density altitude get at C73 in summer?
On a typical July afternoon — around 83 °F at the nearest NOAA normals station — density altitude at Dixon Municipal-Charles R Walgreen Field reaches roughly 2,495 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 C73 on an average day?
It swings with the seasons: from roughly −1,596 ft at the coldest month's average temperature to about 1,920 ft at the warmest month's — all from a constant field elevation of 785 ft. The month-by-month table above carries the full year.
What is the field elevation of Dixon Municipal-Charles R Walgreen Field?
785 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is C73 (FAA), in Dixon, Illinois.