Point Roberts, Washington · field elev 11 ft
Density Altitude at Point Roberts Airpark (1RL)
Point Roberts Airpark sits at 11 ft, and even a typical July afternoon (73 °F) only lifts density altitude to about 926 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 | 39.3 | −1,297 ft | 44.7 | −926 ft |
| February | 41.1 | −1,173 ft | 47.7 | −722 ft |
| March | 44.9 | −913 ft | 52.1 | −426 ft |
| April | 49.8 | −581 ft | 57.6 | −61 ft |
| May | 55.7 | −186 ft | 64.0 | 359 ft |
| June | 60.3 | 117 ft | 68.5 | 650 ft |
| July | 64.0 | 359 ft | 72.8 | 926 ft |
| August | 63.8 | 346 ft | 72.7 | 919 ft |
| September | 58.6 | 5 ft | 66.9 | 547 ft |
| October | 50.7 | −520 ft | 57.4 | −74 ft |
| November | 43.8 | −988 ft | 49.6 | −594 ft |
| December | 39.2 | −1,304 ft | 44.2 | −960 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 1RL
DENSITY ALTITUDE
Field elevation 11 ft — the air behaves like 939 ft.
- PRESSURE ALT
- 12 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 Washington fields
- KORS — Orcas Island
Eastsound · elev 35 ft
- KBLI — Bellingham International
Bellingham · elev 171 ft
- 38W — Lynden Municipal/Jansen Field
Lynden · elev 106 ft
- KFHR — Friday Harbor
Friday Harbor · elev 113 ft
- S31 — Lopez Island
Lopez · elev 209 ft
- 74S — Anacortes
Anacortes · elev 246 ft
- KBVS — Skagit Regional
Burlington/Mount Vernon · elev 145 ft
- KOKH — Delaurentis
Oak Harbor · elev 193 ft
Frequently asked questions
How high does density altitude get at 1RL in summer?
On a typical July afternoon — around 73 °F at the nearest NOAA normals station — density altitude at Point Roberts Airpark reaches roughly 926 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 1RL on an average day?
It swings with the seasons: from roughly −1,304 ft at the coldest month's average temperature to about 359 ft at the warmest month's — all from a constant field elevation of 11 ft. The month-by-month table above carries the full year.
What is the field elevation of Point Roberts Airpark?
11 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 1RL (FAA), in Point Roberts, Washington.