Fallston, Maryland · field elev 460 ft
Density Altitude at Fallston (W42)
Fallston sits at 460 ft, and even a typical July afternoon (87 °F) only lifts density altitude to about 2,333 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 | 34.5 | −1,070 ft | 42.4 | −525 ft |
| February | 37.3 | −875 ft | 46.3 | −260 ft |
| March | 44.0 | −416 ft | 53.8 | 243 ft |
| April | 55.2 | 336 ft | 65.5 | 1,009 ft |
| May | 63.9 | 906 ft | 73.2 | 1,502 ft |
| June | 72.9 | 1,483 ft | 82.0 | 2,055 ft |
| July | 77.9 | 1,799 ft | 86.5 | 2,333 ft |
| August | 75.4 | 1,641 ft | 83.9 | 2,173 ft |
| September | 68.3 | 1,189 ft | 76.8 | 1,730 ft |
| October | 57.4 | 481 ft | 66.3 | 1,061 ft |
| November | 47.5 | −179 ft | 56.4 | 415 ft |
| December | 38.9 | −765 ft | 46.4 | −253 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 W42
DENSITY ALTITUDE
Field elevation 460 ft — the air behaves like 2,364 ft.
- PRESSURE ALT
- 461 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 Maryland fields
- 0W3 — Harford County
Churchville · elev 412 ft
- KMTN — Martin State
Baltimore · elev 22 ft
- W48 — Essex Skypark
Baltimore · elev 14 ft
- KBWI — Baltimore/Washington International Thurgood Marshall
Baltimore · elev 143 ft
- 58M — Claremont
Elkton · elev 106 ft
- 2W2 — Clearview Airpark
Westminster · elev 799 ft
- KDMW — Carroll County Regional/Jack B Poage Field
Westminster · elev 789 ft
- KFME — Fort Meade Exec
Fort Meade (Odenton) · elev 150 ft
Frequently asked questions
How high does density altitude get at W42 in summer?
On a typical July afternoon — around 87 °F at the nearest NOAA normals station — density altitude at Fallston reaches roughly 2,333 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 W42 on an average day?
It swings with the seasons: from roughly −1,070 ft at the coldest month's average temperature to about 1,799 ft at the warmest month's — all from a constant field elevation of 460 ft. The month-by-month table above carries the full year.
What is the field elevation of Fallston?
460 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is W42 (FAA), in Fallston, Maryland.