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The lowest category on the Saffir-Simpson scale is the Category 1 with sustained winds of:

74-95 mph

64-82 kt

119-153 km/h

Of course you can get gusts higher than that during the hurricane.

Tropical storms may have gusts reaching that range but if they are not sustained winds, it doesn't get promoted to the category of a hurricane. Note that hurricanes are defined not only by windspeed but also as part of tropical cyclone weather system.

Category 2 hurricanes are sustained winds of:

96-110 mph

83-95 kt

154-177 km/h

Category 3 hurricanes are sustained winds of:

111-129 mph

96-112 kt

178-208 km/h

Category 4 hurricanes are sustained winds of:

130-156 mph

113-136 kt

209-251 km/h

Category 5 hurricanes are sustained winds of:

157 mph or higher

137 kt or higher

252 km/h or higher

Since CAT 5 has no upper limit for wind speed there is no such thing as a CAT 6 or higher.

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