The routing reads the wind
A wind rose, but weighted by what it costs. Each spoke is how often the wind blows from that quarter; its shade is how much Shinnecock's 18 holes are exposed to it — head-on into the long holes hurts, downwind forgives. The story is the mismatch.
Exposed. The east-northeast (E 1.06–1.07) finds the long holes head-on. It blows this way only ~6% of the time — but when it does, it bites.
Sheltered. The prevailing southwest sea breeze (S+SSW, 36% of June) sits below average exposure (E 0.94–0.96). Shinnecock is built to absorb its most common wind.
The teeth show on an easterly
Shinnecock hides from the wind it gets most. Its hardest exposure is the easterly it gets least. So the course's worst weather days aren't the windy norm — they're the off-direction ones, when a strong wind arrives from a quarter the routing can't swallow.
Severity, volatility, danger
The slow clock
The number above is wind — the fast clock. The other half of weather works slowly: dry-down. Days of sun and wind pull moisture out of the greens (FAO-56 evapotranspiration), and firm greens reject good shots. In June, Shinnecock net-dries — but it rarely bakes.
Why Shinnecock plays this way
Shinnecock Hills sits on Long Island's South Fork in Southampton, on high, treeless ground between Peconic Bay to the north and the Atlantic Ocean roughly two miles south. It is true links land — sandy, glacial soil that drains fast and plays firm, with holes routed in every direction across rolling, naturally exposed terrain. There is almost nothing on the property to stop the wind.
That exposure is the whole weather story. Long Island juts into the open Atlantic, Shinnecock sits on a rise above it, and the prevailing summer breeze comes off the ocean from the southwest, building through the afternoon. June here is mild — daytime highs in the low-to-mid 70s°F, rain on roughly one day in four — but the air is rarely still, and on firm, fast turf a moving ball runs out, shrinking every fairway and green. The routing turns through every point of the compass, so the wind doesn't just blow — it varies, group to group and hour to hour. That is the volatility the numbers above measure.
What this says about 2018
The Saturday draw — morning +3.6, afternoon +6.1 — looked like wind. It wasn't. The wind that day was a flat ~10 mph across both waves, and Shinnecock's wind draw-injustice runs only ~0.5 strokes. The 2.6-stroke collapse was the slow clock: greens firming under days of dry-down, faster than the crews could re-wet. The DNA had it both ways — a wind course that, in June, is governed at the margin by its surface.