Waterbury, Connecticut · field elev 850 ft
Density Altitude at Mount Tobe (N41)
Mount Tobe sits at 850 ft, and even a typical July afternoon (82 °F) only lifts density altitude to about 2,512 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 | 24.0 | −1,321 ft | 33.4 | −659 ft |
| February | 26.2 | −1,165 ft | 36.5 | −445 ft |
| March | 34.3 | −597 ft | 45.4 | 163 ft |
| April | 45.8 | 190 ft | 58.5 | 1,035 ft |
| May | 56.6 | 910 ft | 69.4 | 1,739 ft |
| June | 65.0 | 1,457 ft | 76.9 | 2,213 ft |
| July | 70.0 | 1,777 ft | 81.7 | 2,512 ft |
| August | 68.0 | 1,649 ft | 79.7 | 2,388 ft |
| September | 60.6 | 1,172 ft | 72.1 | 1,911 ft |
| October | 48.9 | 399 ft | 59.8 | 1,119 ft |
| November | 38.9 | −279 ft | 48.8 | 392 ft |
| December | 29.5 | −932 ft | 38.0 | −341 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 N41
DENSITY ALTITUDE
Field elevation 850 ft — the air behaves like 2,531 ft.
- PRESSURE ALT
- 851 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 Connecticut fields
- 4B8 — Robertson Field
Plainville · elev 202 ft
- KOXC — Waterbury-Oxford
Oxford · elev 730 ft
- KMMK — Meriden Markham Municipal
Meriden · elev 103 ft
- KHFD — Hartford-Brainard
Hartford · elev 18 ft
- 11N — Candlelight Farms
New Milford · elev 675 ft
- 4B9 — Simsbury
Simsbury · elev 195 ft
- KHVN — Tweed/New Haven
New Haven · elev 13 ft
- KBDL — Bradley International
Windsor Locks · elev 173 ft
Frequently asked questions
How high does density altitude get at N41 in summer?
On a typical July afternoon — around 82 °F at the nearest NOAA normals station — density altitude at Mount Tobe reaches roughly 2,512 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 N41 on an average day?
It swings with the seasons: from roughly −1,321 ft at the coldest month's average temperature to about 1,777 ft at the warmest month's — all from a constant field elevation of 850 ft. The month-by-month table above carries the full year.
What is the field elevation of Mount Tobe?
850 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is N41 (FAA), in Waterbury, Connecticut.