St Paul, Minnesota · field elev 933 ft
Density Altitude at Lake Elmo (21D)
Lake Elmo sits at 933 ft, and even a typical July afternoon (79 °F) only lifts density altitude to about 2,465 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 | 13.6 | −1,968 ft | 22.3 | −1,339 ft |
| February | 17.8 | −1,662 ft | 27.7 | −955 ft |
| March | 30.3 | −772 ft | 40.7 | −53 ft |
| April | 44.5 | 206 ft | 55.1 | 914 ft |
| May | 57.1 | 1,045 ft | 67.2 | 1,700 ft |
| June | 66.6 | 1,662 ft | 75.8 | 2,246 ft |
| July | 70.8 | 1,930 ft | 79.3 | 2,465 ft |
| August | 69.1 | 1,822 ft | 77.7 | 2,365 ft |
| September | 60.9 | 1,293 ft | 70.7 | 1,924 ft |
| October | 47.8 | 428 ft | 57.7 | 1,085 ft |
| November | 33.3 | −563 ft | 41.4 | −5 ft |
| December | 20.0 | −1,504 ft | 27.5 | −969 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 21D
DENSITY ALTITUDE
Field elevation 933 ft — the air behaves like 2,446 ft.
- PRESSURE ALT
- 934 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 Minnesota fields
- KSTP — St Paul Downtown Holman Field
St Paul · elev 705 ft
- KSGS — South St Paul Municipal/Richard E Fleming Field
South St Paul · elev 821 ft
- 25D — Forest Lake
Forest Lake · elev 930 ft
- KMSP — Minneapolis-St Paul International/Wold-Chamberlain
Minneapolis · elev 842 ft
- KANE — Anoka County/Blaine (Janes Field)
Minneapolis · elev 912 ft
- KMIC — Crystal
Minneapolis · elev 869 ft
- KLVN — Airlake
Minneapolis · elev 960 ft
- KFCM — Flying Cloud
Minneapolis · elev 906 ft
Frequently asked questions
How high does density altitude get at 21D in summer?
On a typical July afternoon — around 79 °F at the nearest NOAA normals station — density altitude at Lake Elmo reaches roughly 2,465 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 21D on an average day?
It swings with the seasons: from roughly −1,968 ft at the coldest month's average temperature to about 1,930 ft at the warmest month's — all from a constant field elevation of 933 ft. The month-by-month table above carries the full year.
What is the field elevation of Lake Elmo?
933 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 21D (FAA), in St Paul, Minnesota.