What is the weakest wind that has ever been recorded in a hurricane?
The barometric pressure of the air at the center, or eye, of the hurricane. Some of the lowest barometric pressures ever recorded have occured in the eyes of hurricanes. The lowest barometric pressure ever recorded on earth was recorded at the center of the "Labor Day Hurricane" of 1935 which struck the Florida Keys.
The lowest pressure ever recorded in a storm dubbed a hurricane was 882 millibars in Hurricane Wilma (2005). However, hurricanes in other parts of the world are called by other names (the generic term is tropical cyclone). The lowest pressure recorded in a tropical cyclone was 870 millibars in Typhoon Tip (1979).
Yes. There have been a few. The most notable of these was the Hurricane John that occurred in 1994. This storm was a category 5 hurricane with peak winds of 175 mph. The storm lasted for 31 days, making it the longest lasting hurricane ever recorded. Since it stayed at sea damage was not very significant.
Rita was the fourth most intense hurricane ever recorded and the most intense tropical cyclone ever in the Gulf of Mexico. Katrina was the seventh most intense hurricane ever recorded. So, strictly in weather terms, Rita was a worse storm. However, Katrina was the costliest natural disaster and one of the five deadliest hurricanes of all time.