Reading, Pennsylvania · field elev 343 ft
Density Altitude at Reading Regional/Carl A Spaatz Field (KRDG)
Reading Regional/Carl A Spaatz Field sits at 343 ft, and even a typical July afternoon (87 °F) only lifts density altitude to about 2,191 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 | 30.8 | −1,475 ft | 38.6 | −931 ft |
| February | 33.1 | −1,313 ft | 41.9 | −705 ft |
| March | 41.5 | −732 ft | 51.0 | −89 ft |
| April | 52.5 | 12 ft | 63.4 | 729 ft |
| May | 62.5 | 671 ft | 73.5 | 1,378 ft |
| June | 71.6 | 1,257 ft | 82.0 | 1,912 ft |
| July | 76.1 | 1,542 ft | 86.5 | 2,191 ft |
| August | 74.3 | 1,428 ft | 84.4 | 2,061 ft |
| September | 66.9 | 956 ft | 77.1 | 1,605 ft |
| October | 55.2 | 191 ft | 65.4 | 859 ft |
| November | 44.6 | −520 ft | 53.8 | 98 ft |
| December | 35.7 | −1,132 ft | 43.4 | −602 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 KRDG
DENSITY ALTITUDE
Field elevation 343 ft — the air behaves like 2,221 ft.
- PRESSURE ALT
- 344 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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- KPTW — Heritage Field
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- KLNS — Lancaster
Lancaster · elev 403 ft
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Frequently asked questions
How high does density altitude get at KRDG in summer?
On a typical July afternoon — around 87 °F at the nearest NOAA normals station — density altitude at Reading Regional/Carl A Spaatz Field reaches roughly 2,191 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 KRDG on an average day?
It swings with the seasons: from roughly −1,475 ft at the coldest month's average temperature to about 1,542 ft at the warmest month's — all from a constant field elevation of 343 ft. The month-by-month table above carries the full year.
What is the field elevation of Reading Regional/Carl A Spaatz Field?
343 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KRDG (ICAO) / RDG (FAA), in Reading, Pennsylvania.