Pot Island, Lake Winnisquam
Winnisquam, located in Sanbornton, Belknap County, New Hampshire, is an ideal dive site for advanced divers in the United States. This expansive lake spans approximately 10.5 miles in length by 1.5 miles in width and boasts an impressive shoreline stretching approximately 28.2 miles. Within Winnisquam, divers can explore five captivating islands, namely Pot, Three, Hog, Loon, and Mohawk.
Designated as a trout and salmon lake by the state, Winnisquam offers a remarkable underwater ecosystem. During the summer season, divers can expect to encounter salmon and lake trout residing between 20 and 40 feet below the thermocline. With a maximum depth reaching 18 meters and visibility averaging around 6 meters, divers are granted the opportunity to explore the intriguing depths of Winnisquam's pristine waters.
Designated as a trout and salmon lake by the state, Winnisquam offers a remarkable underwater ecosystem. During the summer season, divers can expect to encounter salmon and lake trout residing between 20 and 40 feet below the thermocline. With a maximum depth reaching 18 meters and visibility averaging around 6 meters, divers are granted the opportunity to explore the intriguing depths of Winnisquam's pristine waters.
Diving Conditions Score for Pot Island, Lake Winnisquam
5
AverageAverage conditions, be alert.
The score is based on a calculation of the current weather and sea conditions.
Dive Site Overview for Pot Island, Lake Winnisquam
Depth
18m
Visibility
6m
Experience Level
advanced
Weather Conditions for Pot Island, Lake Winnisquam
Wave Height
1m
Wind Speed
7.8 m/s
Water Temp
18°C
Visibility
10.7km
Cloud Cover
95%
Wave Period
8s
Air Temperature
14.6°C
Precipitation
0.7 mm
Detailed 7-Day Diving Forecast for Pot Island, Lake Winnisquam
Alpha
Dive Score Chart for Pot Island, Lake Winnisquam
Best time to dive: 12:00 with score 7.063333333333333/10. Water conditions: Waves 1m, Wind 5.2 m/s.Best night dive time: 0:00 with score 6.387833333333333/10.
Chart showing hourly dive conditions including wave height, wind speed, water temperature, and visibility throughout the day.
Sunrise at Pot Island, Lake Winnisquam: 06:00
Sunset at Pot Island, Lake Winnisquam: 18:00
Optimal diving conditions at Pot Island, Lake Winnisquam are affected by daylight hours. Sunrise occurs at 06:00 and sunset at 18:00, which impacts visibility and water temperature for scuba diving and snorkeling.
Best Overall
12:00Score: 7.1/10
Waves: 1m (8s), Wind: 5.2 m/s
Best Night
0:00Score: 6.4/10
Waves: 1m, Wind: 6.3 m/s
Seasonal Analysis for Pot Island, Lake WinnisquamAlpha
Historical patterns and best seasons for diving at Pot Island, Lake Winnisquam
The dive score combines all factors to rate overall diving conditions throughout the year. Higher scores indicate better diving conditions.
Monthly Dive Score Analysis - Seasonal Diving Conditions
Higher values indicate better diving conditions
Seasonal DiveScore Chart
This chart displays monthly diveScore data throughout the year, showing seasonal patterns. The data is presented as a bar chart with an overlaid line graph.Dive scores range from 1 to 10, with 10 being optimal conditions.
Higher values indicate better diving conditions
Best Season for Pot Island, Lake Winnisquam
Winter
Avg. Score: 8.3/10
Winter offers the best overall diving conditions with calmer seas and better visibility, despite cooler temperatures.
Best Months for Pot Island, Lake Winnisquam
January
Score: 8.7
December
Score: 8.2
February
Score: 8.1
Ideal Conditions for Pot Island, Lake Winnisquam
Water Temp
22.4°C / 72.3°F
July
Visibility
15.6m / 51.2ft
January
Wave Height
0.8m / 2.6ft
January
Wave Period
8.0s
January
Seasonal Insights for Pot Island, Lake Winnisquam
Pot Island, Lake Winnisquam shows typical northern hemisphere patterns with July being the warmest month (22.4°C) and January the coldest (-11.9°C). The calmest conditions typically occur in January with average wave heights of 0.8m and wave periods of 8.0s. The most comfortable wave conditions are in January with a low wave steepness ratio, creating gentler swells. January offers the longest wave periods (8.0s), creating more comfortable and predictable conditions for boat entries and exits. Ocean currents are slowest in January (0.5m/s) and strongest in January (0.5m/s). May is usually the driest month with 0.0mm of precipitation. For beginners, the best time to visit would be during January to March, when ocean conditions are calmer with long-period waves and currents are typically weaker. Experienced divers might enjoy the challenges and potentially better visibility during the shoulder seasons, with moderate currents that can improve marine life encounters.
Last updated: 1 min. ago - Jun 23, 2026
Note: This dive site is not a verified dive site. Please dive with caution. This dive site might have incorrect information by the community.
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