Vacation just about any place else in the Caribbean during hurricane season (Jun - Oct) and you are taking a risk. Not so on the Dominican's beautiful northern coastline. Hurricanes and the Dominican Republic, particularly the north coast, hardly ever come together.
From the dawn of time hurricanes have hurtled off Africa and South America into the Caribbean. If you go to the NOAA website, you can see how very few hurricanes have ever even come close to the north coast, much less hit it. The depths of the Puerto Rico Trench shove any incoming hurricanes to the north and those from the south are battered by the soaring mountains of the Dominican Republic (highest in the entire Caribbean).