Jefferson, Iowa · field elev 1,047 ft
Density Altitude at Jefferson Municipal (KEFW)
Jefferson Municipal sits at 1,047 ft, and even a typical July afternoon (83 °F) only lifts density altitude to about 2,858 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 | 18.4 | −1,476 ft | 27.6 | −820 ft |
| February | 22.9 | −1,153 ft | 32.5 | −476 ft |
| March | 35.6 | −261 ft | 46.1 | 455 ft |
| April | 48.1 | 589 ft | 60.2 | 1,388 ft |
| May | 59.9 | 1,369 ft | 71.1 | 2,089 ft |
| June | 69.9 | 2,013 ft | 80.5 | 2,679 ft |
| July | 73.1 | 2,215 ft | 83.4 | 2,858 ft |
| August | 70.9 | 2,076 ft | 81.3 | 2,728 ft |
| September | 63.5 | 1,602 ft | 75.8 | 2,385 ft |
| October | 51.0 | 783 ft | 62.9 | 1,564 ft |
| November | 36.1 | −227 ft | 46.4 | 475 ft |
| December | 24.2 | −1,060 ft | 32.9 | −448 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 KEFW
DENSITY ALTITUDE
Field elevation 1,047 ft — the air behaves like 2,833 ft.
- PRESSURE ALT
- 1,048 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 Iowa fields
- KPRO — Perry Municipal
Perry · elev 1,013 ft
- KGCT — Guthrie County Regional
Guthrie Center · elev 1,221 ft
- KCIN — Arthur N Neu
Carroll · elev 1,204 ft
- KBNW — Boone Municipal
Boone · elev 1,160 ft
- 2Y4 — Rockwell City Municipal
Rockwell City · elev 1,216 ft
- KADU — Audubon County
Audubon · elev 1,288 ft
- KAMW — Ames Municipal
Ames · elev 956 ft
- KEBS — Webster City Municipal
Webster City · elev 1,122 ft
Frequently asked questions
How high does density altitude get at KEFW in summer?
On a typical July afternoon — around 83 °F at the nearest NOAA normals station — density altitude at Jefferson Municipal reaches roughly 2,858 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 KEFW on an average day?
It swings with the seasons: from roughly −1,476 ft at the coldest month's average temperature to about 2,215 ft at the warmest month's — all from a constant field elevation of 1,047 ft. The month-by-month table above carries the full year.
What is the field elevation of Jefferson Municipal?
1,047 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KEFW (ICAO) / EFW (FAA), in Jefferson, Iowa.