Harlan, Iowa · field elev 1,231 ft
Density Altitude at Harlan Municipal (KHNR)
Harlan Municipal sits at 1,231 ft, and even a typical July afternoon (86 °F) only lifts density altitude to about 3,236 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 | 20.5 | −1,094 ft | 30.7 | −372 ft |
| February | 24.7 | −794 ft | 35.7 | −25 ft |
| March | 37.6 | 106 ft | 49.9 | 937 ft |
| April | 49.8 | 931 ft | 63.3 | 1,816 ft |
| May | 61.7 | 1,712 ft | 74.1 | 2,504 ft |
| June | 71.7 | 2,352 ft | 83.6 | 3,095 ft |
| July | 74.7 | 2,541 ft | 85.9 | 3,236 ft |
| August | 72.4 | 2,397 ft | 84.0 | 3,119 ft |
| September | 65.1 | 1,932 ft | 78.5 | 2,779 ft |
| October | 52.2 | 1,090 ft | 65.4 | 1,951 ft |
| November | 37.6 | 106 ft | 49.3 | 897 ft |
| December | 25.8 | −716 ft | 35.9 | −11 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 KHNR
DENSITY ALTITUDE
Field elevation 1,231 ft — the air behaves like 3,242 ft.
- PRESSURE ALT
- 1,232 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
- KAIO — Atlantic Municipal
Atlantic · elev 1,165 ft
- 3Y4 — Woodbine Municipal
Woodbine · elev 1,068 ft
- KADU — Audubon County
Audubon · elev 1,288 ft
- KDNS — Denison Municipal
Denison · elev 1,274 ft
- Y43 — Anita Municipal-Kevin Burke Meml Field
Anita · elev 1,251 ft
- KCBF — Council Bluffs Municipal
Council Bluffs · elev 1,245 ft
- KRDK — Red Oak Municipal
Red Oak · elev 1,045 ft
- KCIN — Arthur N Neu
Carroll · elev 1,204 ft
Frequently asked questions
How high does density altitude get at KHNR in summer?
On a typical July afternoon — around 86 °F at the nearest NOAA normals station — density altitude at Harlan Municipal reaches roughly 3,236 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 KHNR on an average day?
It swings with the seasons: from roughly −1,094 ft at the coldest month's average temperature to about 2,541 ft at the warmest month's — all from a constant field elevation of 1,231 ft. The month-by-month table above carries the full year.
What is the field elevation of Harlan Municipal?
1,231 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KHNR (ICAO) / HNR (FAA), in Harlan, Iowa.