Helena, MT (1940-1987)
 
 
   Fastest Mile (mph)   3-s peak gusts (mph)   3-s peak gusts (m/s)
SW           58                71                     32
S            58                71                     32
SW           58                71                     32
N            58                71                     32
SW           70                84                     38
W            55                68                     30
NW           56                69                     31
S            62                76                     34
W            59                72                     32
W            70                84                     38
SE           56                69                     31
W            49                61                     27
SW           54                66                     30
SW           55                68                     30
W            50                62                     28
SW           58                71                     32
S            48                60                     27
W            55                68                     30
N            54                66                     30
W            52                64                     29
SW           57                70                     31
W            55                68                     30
SW           61                74                     33
W            46                58                     26
W            49                61                     27
W            46                58                     26
WS           59                72                     32
W            59                72                     32
W            50                62                     28
S            49                61                     27
W            61                74                     33
W            47                59                     26
NW           55                68                     30
NW           48                60                     27
SW           47                59                     26
SW           71                85                     38
SW           49                61                     27
NW           51                63                     28
NW           57                70                     31
NW           49                61                     27
SW           46                58                     26
NW           55                68                     30
SW           49                61                     27
NW           55                68                     30
W            53                66                     30
N            46                58                     26
NW           47                59                     26
W            42                53                     24