Forest Lake, Minnesota · field elev 930 ft
Density Altitude at Forest Lake (25D)
Forest Lake sits at 930 ft, and even a typical July afternoon (83 °F) only lifts density altitude to about 2,715 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 | −1,972 ft | 24.2 | −1,207 ft |
| February | 18.2 | −1,637 ft | 30.1 | −790 ft |
| March | 31.0 | −727 ft | 43.0 | 100 ft |
| April | 45.1 | 242 ft | 57.6 | 1,074 ft |
| May | 57.6 | 1,074 ft | 69.8 | 1,863 ft |
| June | 67.6 | 1,722 ft | 79.1 | 2,449 ft |
| July | 71.8 | 1,990 ft | 83.4 | 2,715 ft |
| August | 69.9 | 1,869 ft | 81.5 | 2,598 ft |
| September | 61.9 | 1,355 ft | 73.7 | 2,110 ft |
| October | 48.5 | 471 ft | 59.9 | 1,225 ft |
| November | 33.3 | −567 ft | 43.0 | 100 ft |
| December | 19.8 | −1,522 ft | 28.9 | −874 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 25D
DENSITY ALTITUDE
Field elevation 930 ft — the air behaves like 2,691 ft.
- PRESSURE ALT
- 931 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
- KANE — Anoka County/Blaine (Janes Field)
Minneapolis · elev 912 ft
- 21D — Lake Elmo
St Paul · elev 933 ft
- KMIC — Crystal
Minneapolis · elev 869 ft
- KSTP — St Paul Downtown Holman Field
St Paul · elev 705 ft
- KCBG — Cambridge Municipal
Cambridge · elev 945 ft
- KSGS — South St Paul Municipal/Richard E Fleming Field
South St Paul · elev 821 ft
- KMSP — Minneapolis-St Paul International/Wold-Chamberlain
Minneapolis · elev 842 ft
- KROS — Rush City Regional
Rush City · elev 926 ft
Frequently asked questions
How high does density altitude get at 25D in summer?
On a typical July afternoon — around 83 °F at the nearest NOAA normals station — density altitude at Forest Lake reaches roughly 2,715 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 25D on an average day?
It swings with the seasons: from roughly −1,972 ft at the coldest month's average temperature to about 1,990 ft at the warmest month's — all from a constant field elevation of 930 ft. The month-by-month table above carries the full year.
What is the field elevation of Forest Lake?
930 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 25D (FAA), in Forest Lake, Minnesota.