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Winthrop Jetty ratings
Quality on a good day: 2.3
Consistency of Surf: 2.0
Difficulty Level: 2.8
Wind and Kite Surfing: 1.2
Crowds: 2.4

Overall: 2.0

See all 18 ratings

Based on 25 votes. Vote


Surf Report Feed

Winthrop Jetty Swell Statistics, Winter: Surf with Light or Offshore Winds

The rose diagram shows only the swells directed at Winthrop Jetty that coincided with light winds or offshore conditions over a normal northern hemisphere winter. It is based on 7764 predictions, one every 3 hours. The direction of the spokes show where quality surf generating swell comes from. Five colours illustrate increasing wave sizes. Blue shows the smallest swells, less that 0.5m (1.5 feet) high. Green and yellow represent increasing swell sizes and red illustrates the biggest swells, greater than >3m (>10ft). In each graph, the area of any colour is proportional to how frequently that size swell happens.

The diagram suggests that the dominant swell direction, shown by the largest spokes, was E, whereas the the prevailing wind blows from the WNW. The chart at the bottom shows the same thing but without direction information. For example, swells larger than 1.5 feet (0.5m) coincided with good wind conditions 24% of the time, equivalent to 22 days. Open sea swells exceeding >3m (>10ft) are unlikely to arise in a normal northern hemisphere winter but 4% of the time you can expect swell in the range 1.3-2m (4-6.5ft) 4%, equivalent to (4 days). Taking into account the ratio of these swells that coincided with expected offshore winds, and given the fact that Winthrop Jetty is exposed to open water swells, we calculate that clean surf can be found at Winthrop Jetty about 24% of the time and that surf is messed up by onshore wind 22% of the time. This is means that we expect 42 days with waves in a typical northern hemisphere winter, of which 22 days should be surfable.

IMPORTANT: Beta version feature! Swell heights are open water values from NWW3. There is no attempt to model near-shore effects. Coastal wave heights will generally be less, especially if the break does not have unobstructed exposure to the open ocean.