Jaffrey, New Hampshire · field elev 1,040 ft
Density Altitude at Jaffrey Airfield Silver Ranch (KAFN)
Jaffrey Airfield Silver Ranch sits at 1,040 ft, and even a typical July afternoon (81 °F) only lifts density altitude to about 2,670 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 | 22.3 | −1,205 ft | 31.3 | −569 ft |
| February | 24.3 | −1,062 ft | 34.1 | −374 ft |
| March | 32.3 | −499 ft | 42.1 | 176 ft |
| April | 44.2 | 318 ft | 55.1 | 1,046 ft |
| May | 55.5 | 1,072 ft | 66.9 | 1,812 ft |
| June | 64.6 | 1,665 ft | 75.3 | 2,345 ft |
| July | 69.8 | 1,998 ft | 80.5 | 2,670 ft |
| August | 68.1 | 1,889 ft | 78.8 | 2,564 ft |
| September | 60.3 | 1,386 ft | 71.0 | 2,074 ft |
| October | 48.8 | 628 ft | 58.6 | 1,275 ft |
| November | 38.2 | −91 ft | 46.7 | 487 ft |
| December | 28.4 | −772 ft | 36.4 | −215 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 KAFN
DENSITY ALTITUDE
Field elevation 1,040 ft — the air behaves like 2,701 ft.
- PRESSURE ALT
- 1,041 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 New Hampshire fields
- KEEN — Dillant/Hopkins
Keene · elev 488 ft
- 8B1 — Hawthorne-Feather Airpark
Hillsboro · elev 600 ft
- KASH — Boire Field
Nashua · elev 200 ft
- KMHT — Manchester Boston Regional
Manchester · elev 266 ft
- KCON — Concord Municipal
Concord · elev 342 ft
- 2B3 — Parlin Field
Newport · elev 784 ft
- KCNH — Claremont Municipal
Claremont · elev 543 ft
- 2N2 — Newfound Valley
Bristol · elev 510 ft
Frequently asked questions
How high does density altitude get at KAFN in summer?
On a typical July afternoon — around 81 °F at the nearest NOAA normals station — density altitude at Jaffrey Airfield Silver Ranch reaches roughly 2,670 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 KAFN on an average day?
It swings with the seasons: from roughly −1,205 ft at the coldest month's average temperature to about 1,998 ft at the warmest month's — all from a constant field elevation of 1,040 ft. The month-by-month table above carries the full year.
What is the field elevation of Jaffrey Airfield Silver Ranch?
1,040 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KAFN (ICAO) / AFN (FAA), in Jaffrey, New Hampshire.