Houghton Lake, Michigan · field elev 1,150 ft
Density Altitude at Roscommon County/Blodgett Meml (KHTL)
Roscommon County/Blodgett Meml sits at 1,150 ft, and even a typical July afternoon (81 °F) only lifts density altitude to about 2,804 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 | 19.1 | −1,296 ft | 26.9 | −740 ft |
| February | 20.3 | −1,210 ft | 29.6 | −550 ft |
| March | 29.7 | −543 ft | 40.4 | 197 ft |
| April | 42.2 | 319 ft | 53.8 | 1,096 ft |
| May | 54.7 | 1,155 ft | 67.2 | 1,967 ft |
| June | 63.9 | 1,755 ft | 76.7 | 2,568 ft |
| July | 67.8 | 2,005 ft | 80.5 | 2,804 ft |
| August | 65.8 | 1,877 ft | 78.3 | 2,668 ft |
| September | 58.3 | 1,391 ft | 70.6 | 2,183 ft |
| October | 46.8 | 630 ft | 56.8 | 1,293 ft |
| November | 35.5 | −140 ft | 43.1 | 380 ft |
| December | 25.6 | −832 ft | 32.1 | −375 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 KHTL
DENSITY ALTITUDE
Field elevation 1,150 ft — the air behaves like 2,835 ft.
- PRESSURE ALT
- 1,151 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 Michigan fields
- 5Y2 — Houghton Lake State
Houghton Lake Heights · elev 1,165 ft
- 3RC — Roscommon Conservation
Roscommon · elev 1,157 ft
- 6Y6 — St Helen
St Helen · elev 1,198 ft
- 6Y0 — Moorestown Airpark
Moorestown · elev 1,211 ft
- 5M6 — Sugar Springs Airpark
Gladwin · elev 953 ft
- KGOV — Grayling Aaf
Grayling · elev 1,158 ft
- 80D — Clare County
Harrison · elev 1,142 ft
- Y91 — Home Acres Sky Ranch
Lake City · elev 1,246 ft
Frequently asked questions
How high does density altitude get at KHTL in summer?
On a typical July afternoon — around 81 °F at the nearest NOAA normals station — density altitude at Roscommon County/Blodgett Meml reaches roughly 2,804 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 KHTL on an average day?
It swings with the seasons: from roughly −1,296 ft at the coldest month's average temperature to about 2,005 ft at the warmest month's — all from a constant field elevation of 1,150 ft. The month-by-month table above carries the full year.
What is the field elevation of Roscommon County/Blodgett Meml?
1,150 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KHTL (ICAO) / HTL (FAA), in Houghton Lake, Michigan.