Climbing Forecast › New Jersey › Delaware Water Gap (Mt Tammany)

NEW JERSEY · QUARTZITE

Delaware Water Gap (Mt Tammany) climbing conditions

Good — dry and climbable

Right now

Temp58°F
Wind10 mph
Gusts15 mph
Humidity94.4%
Rain 48hdry
Last rainNone recent

Assessment

No recent rain
Good friction temperature range for quartzite
High humidity (94.4%) — quartzite friction compromised, particularly for bouldering
Humidity 94.4% — potential fog/cloud, rock may be damp from condensation

7-day forecast

Scroll through each day — hourly detail is shown inline.

Today Friday 21 August
Good
Temp64°F
Raindry
Wind8 mph
Gusts15 mph
Humidity80%
No recent rain
  • Quartzite holds friction well when dry
Time °F Rain Wind (mph) Gust Hum
07:00 58° dry 10 — 94.4%
08:00 57° dry 10 — 93.6%
09:00 57° dry 10 — 93.9%
10:00 57° dry 10 — 94.2%
11:00 58° dry 9 — 93.5%
12:00 61° dry 8 — 88.3%
13:00 65° dry 7 — 83.1%
14:00 69° dry 7 — 74.2%
15:00 71° dry 8 — 65.5%
16:00 74° dry 7 — 61.7%
17:00 76° dry 6 — 59.2%
18:00 77° dry 6 — 55.2%
19:00 77° dry 6 — 52.7%
20:00 76° dry 7 — 55.3%
21:00 75° dry 7 — 63.2%
Sat Saturday 22 August
Poor
Temp64°F
Rain0.02 in
Wind4 mph
Gusts—
Humidity88%
0.5mm rain forecastHumidity 88% — potential fog
  • Quartzite holds friction well when dry
Time °F Rain Wind (mph) Gust Hum
06:00 61° dry 3 — 96.8%
07:00 60° dry 4 — 98%
08:00 59° dry 4 — 98.1%
09:00 60° dry 5 — 97%
10:00 59° dry 4 — 97.1%
11:00 61° dry 4 — 96.7%
12:00 64° dry 3 — 92.3%
13:00 65° dry 3 — 89.2%
14:00 67° dry 3 — 84.7%
15:00 70° 0.01 in 4 — 76.5%
16:00 70° 0.01 in 5 — 79.2%
17:00 72° 0.00 in 5 — 75.7%
18:00 74° dry 5 — 69.2%
19:00 75° dry 5 — 65%
20:00 76° dry 6 — 61.2%
21:00 76° dry 6 — 59.4%
Sun Sunday 23 August
Poor
Temp66°F
Rain0.02 in
Wind4 mph
Gusts—
Humidity90%
0.5mm rain forecastHumidity 90% — potential fog
  • Quartzite holds friction well when dry
Time °F Rain Wind (mph) Gust Hum
06:00 63° dry 3 — 98.2%
07:00 62° dry 2 — 99.4%
08:00 62° dry 4 — 99.2%
09:00 61° dry 3 — 99.8%
10:00 61° 0.01 in 2 — 99.6%
11:00 62° dry 2 — 99.4%
12:00 65° dry 1 — 92.8%
13:00 68° dry 4 — 87.1%
14:00 69° dry 6 — 85.8%
15:00 69° 0.00 in 6 — 85.1%
16:00 72° 0.00 in 7 — 77.2%
17:00 75° 0.00 in 8 — 70.9%
18:00 77° dry 8 — 66.9%
19:00 78° dry 9 — 64.1%
20:00 78° dry 9 — 61.7%
21:00 77° dry 9 — 60.7%
Mon Monday 24 August
Caution
Temp63°F
Rain0.00 in
Wind2 mph
Gusts—
Humidity88%
No recent rainHumidity 88% — potential fog
  • Quartzite holds friction well when dry
Time °F Rain Wind (mph) Gust Hum
06:00 60° dry 4 — 86.9%
12:00 62° dry 2 — 87.8%
18:00 74° dry 9 — 53.7%
Tue Tuesday 25 August
Caution
Temp59°F
Raindry
Wind2 mph
Gusts—
Humidity87%
No recent rainHumidity 87% — potential fog
  • Quartzite holds friction well when dry
Time °F Rain Wind (mph) Gust Hum
06:00 58° dry 4 — 83.3%
12:00 60° dry 3 — 86.5%
18:00 75° dry 8 — 43.1%
Wed Wednesday 26 August
Caution
Temp61°F
Raindry
Wind1 mph
Gusts—
Humidity87%
No recent rainHumidity 87% — potential fog
  • Quartzite holds friction well when dry
Time °F Rain Wind (mph) Gust Hum
06:00 59° dry 2 — 82%
12:00 60° dry 1 — 87.1%
18:00 78° dry 6 — 49%
Thu Thursday 27 August
Poor
Temp66°F
Rain0.09 in
Wind3 mph
Gusts—
Humidity99%
2.3mm rain forecastHumidity 99% — likely fog/cloud
  • Wet quartzite is slippery but not damaged by climbing
Time °F Rain Wind (mph) Gust Hum
06:00 65° 0.02 in 0 — 93.6%
12:00 66° 0.06 in 3 — 98.9%
18:00 70° 0.01 in 1 — 95.9%
Fri Friday 28 August
Poor
Temp68°F
Rain0.01 in
Wind2 mph
Gusts—
Humidity97%
Drying — 18h since rainHumidity 97% — likely fog/cloud
  • Quartzite holds friction well when dry
Time °F Rain Wind (mph) Gust Hum
06:00 67° dry 0 — 99.3%
12:00 68° dry 2 — 97.4%
18:00 82° 0.01 in 9 — 63.9%

About Delaware Water Gap (Mt Tammany)

The Delaware Water Gap's Mount Tammany cliffs are New Jersey's biggest multi-pitch trad venue — Shawangunk Formation metaquartzite (the same Silurian quartz-rich stratum that becomes conglomerate at the Gunks) capping the Kittatinny Ridge where the Delaware River cuts through. Mountain Project calls Tammany "bigger and more spectacular than Minsi" (the PA-side cliff across the river). The rock is quartz-cemented, well-bedded, and durable, giving predominantly moderate trad routes. Mountain Project's top-ticked classics are The Rib (5.3, two pitches), Triumvirate (5.4, two pitches), Black Wall Route (5.7, three pitches), Double Overhang (5.8, two pitches), and Corkscrew (5.8+) on the Great Arch. Approach is a steep 40-minute hike from the Dunnfield Creek parking lot inside Delaware Water Gap NRA. National Park Service land — free, no permit or fee; a strict ground-up ethic applies (no sport bolting; power drills and new hardware are illegal on federal land) and helmets are required. Peregrine falcon closures at DEWA are on Mount MINSI (PA side, Point of Gap parking lot to Arrow Island) — Mount Tammany itself has NO active peregrine ban. April–June and September–November are prime.

Region
New Jersey
Rock type
quartzite
Aspect
west-facing
Altitude
1509 ft
Exposure
high
Seepage
medium