Simsbury, Connecticut · field elev 195 ft
Density Altitude at Simsbury (4B9)
Simsbury sits at 195 ft, and even a typical July afternoon (85 °F) only lifts density altitude to about 1,930 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 | 27.1 | −1,922 ft | 35.3 | −1,345 ft |
| February | 29.6 | −1,745 ft | 38.5 | −1,123 ft |
| March | 37.8 | −1,171 ft | 47.3 | −521 ft |
| April | 49.5 | −373 ft | 60.5 | 357 ft |
| May | 60.0 | 325 ft | 71.7 | 1,082 ft |
| June | 68.9 | 902 ft | 79.9 | 1,600 ft |
| July | 74.3 | 1,247 ft | 85.2 | 1,930 ft |
| August | 72.5 | 1,133 ft | 83.3 | 1,812 ft |
| September | 64.8 | 638 ft | 75.7 | 1,336 ft |
| October | 53.0 | −138 ft | 63.5 | 553 ft |
| November | 42.3 | −861 ft | 51.5 | −239 ft |
| December | 32.6 | −1,533 ft | 40.6 | −978 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 4B9
DENSITY ALTITUDE
Field elevation 195 ft — the air behaves like 1,917 ft.
- PRESSURE ALT
- 196 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
- KBDL — Bradley International
Windsor Locks · elev 173 ft
- 7B6 — Skylark Airpark
Warehouse Point · elev 120 ft
- KHFD — Hartford-Brainard
Hartford · elev 18 ft
- 4B8 — Robertson Field
Plainville · elev 202 ft
- 7B9 — Ellington
Ellington · elev 253 ft
- N41 — Mount Tobe
Waterbury · elev 850 ft
- KMMK — Meriden Markham Municipal
Meriden · elev 103 ft
- 9B8 — Salmon River Airfield
Marlborough · elev 540 ft
Frequently asked questions
How high does density altitude get at 4B9 in summer?
On a typical July afternoon — around 85 °F at the nearest NOAA normals station — density altitude at Simsbury reaches roughly 1,930 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 4B9 on an average day?
It swings with the seasons: from roughly −1,922 ft at the coldest month's average temperature to about 1,247 ft at the warmest month's — all from a constant field elevation of 195 ft. The month-by-month table above carries the full year.
What is the field elevation of Simsbury?
195 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 4B9 (FAA), in Simsbury, Connecticut.