List of Category 4 Atlantic hurricanes
1976–2000

Name
Season
Month
Max. sustained winds
Max. sustained winds
Max. sustained winds
Minimum pressure
Name
Season
Month
(Knots)
(km/h)
(mph)
(mbar)
Hurricane Ella
1978
August, September
120
220
140
956
Hurricane Greta
1978
September
115
215
130
947
Hurricane Frederic
1979
August, September
115
215
130
943
Hurricane Harvey
1981
September
115
215
130
946
Hurricane Debby
1982
September
115
215
130
950
Hurricane Diana
1984
September
115
215
130
949
Hurricane Gloria
1985
September, October
125
230
145
919
Hurricane Helene
1988
September
125
230
145
938
Hurricane Joan
1988
October, November
125
230
145
932
Hurricane Gabrielle
1989
August, September
125
230
145
935
Hurricane Claudette
1991
September
115
215
130
943
Hurricane Felix
1995
August
120
220
140
929
Hurricane Luis
1995
August, September
120
220
140
935
Hurricane Opal
1995
September, October
130
240
150
916
Hurricane Edouard
1996
August, September
125
230
145
933
Hurricane Hortense
1996
September
120
220
140
935
Hurricane Georges
1998
September, October
135
250
155
937
Hurricane Bret
1999
August
125
230
145
944
Hurricane Cindy
1999
August
120
220
140
942
Hurricane Floyd
1999
September
135
250
155
921
Hurricane Gert
1999
September
130
240
150
930
Hurricane Lenny
1999
November
135
250
155
933
Hurricane Isaac
2000
September, October
120
220
140
943
Hurricane Keith
2000
September, October
120
220
140
939
Sources: Atlantic Hurricane Best Track File 1851–2012
Sources: Atlantic Hurricane Best Track File 1851–2012
Sources: Atlantic Hurricane Best Track File 1851–2012
Sources: Atlantic Hurricane Best Track File 1851–2012
Sources: Atlantic Hurricane Best Track File 1851–2012
Sources: Atlantic Hurricane Best Track File 1851–2012
Sources: Atlantic Hurricane Best Track File 1851–2012

Question: What season was the worst for Category 4 hurricanes and how many were there?
Answer: The 1999 Atlantic hurricane season had five Category 4 hurricanes – the highest number recorded in a single season in the Atlantic basin.