Average Number of Days with Heavy Fog - Western Regional Climate Center (WRCC)
Heavy fog is defined as an observation with 1/4 mile visibility or less sometime during
the day.

* = less than 1/2 day 

For more information click here on Western States, Alaska  or Hawaii and Pacific Islands

Click on a State: Arizona, California, Colorado, Hawaii & Pacific Islands, Idaho, Montana, 
Nevada, New Mexico, Oregon, Utah, Washington, Wyoming


                        MEAN MONTHLY AND ANNUAL NUMBER OF DAYS HEAVY FOG


                    JAN  FEB  MAR  APR  MAY  JUN  JUL  AUG  SEP  OCT  NOV  DEC   ANNUAL
ALASKA

ANCHORAGE             6    4    2    1    *    *    *    1    1    2    4    5     26
ANNETTE               1    1    1    *    1    1    2    2    3    1    1    *     15
BARROW                2    1    1    3    7   10   12   12    5    3    2    1     61
BETHEL                4    3    4    4    5    3    4    6    5    4    4    5     50
BETTLES               1    *    *    *    *    *    1    1    1    1    *    *      6
BIG DELTA             2    *    *    *    *    0    *    1    2    1    1    1      9
COLD BAY              2    1    2    1    2    2    4    3    1    *    1    2     21
FAIRBANKS             4    2    1    *    *    *    1    2    1    2    1    3     18
GULKANA               *    1    1    *    *    0    1    2    3    4    3    2     18
HOMER                 1    1    1    *    *    *    1    2    1    *    *    1      8
JUNEAU                2    2    2    1    1    *    *    1    3    3    3    2     21
KING SALMON           3    1    2    2    2    3    5    4    3    3    3    3     33
KODIAK                1    1    1    *    1    2    3    3    1    *    *    1     14
KOTZEBUE              1    1    1    2    4    5    2    1    1    1    *    1     19
MCGRATH               2    1    1    *    1    *    1    1    1    1    1    2     13
NOME                  2    1    1    1    3    4    3    1    1    *    1    2     21
ST. PAUL ISLAND       2    3    3    3    7   10   13   10    4    1    1    1     58
TALKEETNA             *    *    *    *    *    *    *    *    1    1    1    1      5
VALDEZ                1    1    1    *    *    *    3    5    3    1    1    1     17
YAKUTAT               2    3    2    2    2    3    4    5    4    1    1    2     29


ARIZONA

FLAGSTAFF             2    2    2    1    *    0    *    *    1    1    1    2     12
PHOENIX               1    *    *    0    0    0    0    0    0    0    *    1      1
TUCSON                *    *    *    0    0    0    0    0    *    0    *    *      1
WINSLOW               1    1    *    *    0    0    0    0    *    *    1    2      4
YUMA                  1    *    0    0    0    0    0    0    *    0    *    1      2



CALIFORNIA

BAKERSFIELD           8    3    1    *    *    0    *    *    *    *    3    8     22
BISHOP                *    0    0    *    0    0    0    0    0    0    *    *      *
BLUE CANYON          10    9   11    7    6    2    0    *    1    5    7   10     68
EUREKA                4    3    2    2    1    2    4    5    8   10    6    4     51
FRESNO               12    6    2    *    *    0    0    *    *    1    6   12     39
LONG BEACH            5    4    3    2    1    2    2    3    4    5    5    6     41
LOS ANGELES AP        4    3    3    2    1    1    2    2    3    5    5    5     37
LOS ANGELES CITY      2    2    1    1    1    1    1    1    1    3    2    2     17
MT SHASTA CITY        2    1    *    *    0    *    0    0    *    *    1    2      7
OAKLAND               4    2    1    *    *    0    0    0    *    2    3    4     17
REDDING               5    1    1    *    0    0    0    0    0    *    2    6     15
RED BLUFF             6    2    1    *    *    0    0    0    0    *    2    6     18
SACRAMENTO           10    5    2    *    *    0    0    *    *    1    5   10     34
SANDBERG             10   12   12    9    7    3    *    1    2    5    6   10     79
SAN DIEGO             3    3    2    1    1    1    1    1    2    3    3    4     23
SAN FRANCISCO AP      4    3    *    *    *    *    *    *    1    1    2    3     14
SAN FRANCISCO CI      
SANTA BARBARA         1    2    2    1    1    1    2    2    3    3    1    1     21
SANTA MARIA           5    4    5    6    6    7    8   10   12   12    7    6     87
STOCKTON             12    8    2    *    *    *    0    *    *    2    8   11     42


COLORADO

ALAMOSA               4    2    1    1    1    *    1    1    1    1    2    4     19
COLORADO SPRINGS      2    3    3    2    2    1    1    1    2    2    2    2     22
DENVER                1    2    1    1    1    *    *    1    1    1    1    1     10
GRAND JUNCTION        3    2    1    *    *    0    0    0    0    *    1    2      8
PUEBLO                1    1    1    1    1    *    *    *    1    1    1    2      9


HAWAII & PACIFIC ISLANDS

HILO                  0    0    0    0    0    0    0    0    0    0    0    0      0
HONOLULU              0    0    0    0    0    0    0    0    0    0    0    0      0
KAHULUI               0    0    0    0    0    0    0    0    0    0    0    0      0
LIHUE                 0    0    0    0    0    0    0    0    0    0    0    0      0

GUAM                  0    0    0    0    0    0    0    0    0    0    0    *      *
JOHNSTON              0    0    0    0    0    0    0    0    0    0    0    0      0
KOROR                 0    0    0    0    0    0    0    0    0    0    0    0      0
KWAJALEIN             0    0    0    0    0    0    0    0    0    0    0    0      0
MAJURO                0    0    0    0    0    0    0    0    0    0    0    0      0
PAGO PAGO             0    0    0    0    0    0    0    0    0    0    0    0      0
PONAPE                0    0    0    0    0    0    0    0    0    0    0    0      0
TRUK (CHUUK)          0    0    0    0    0    0    0    0    0    0    0    0      0
WAKE                  0    0    0    0    0    0    0    0    0    0    0    0      0
YAP                   0    0    0    0    0    0    0    0    0    0    0    0      0


IDAHO

BOISE                 6    3    1    *    *    *    0    *    *    1    3    6     20
LEWISTON              4    4    1    *    *    *    0    0    *    2    4    6     21
POCATELLO             5    3    2    1    *    *    *    0    *    *    2    4     17


MONTANA

BILLINGS              2    2    2    3    1    1    *    *    1    2    2    2     18
GLASGOW               2    2    2    1    *    *    *    *    *    1    2    3     13
GREAT FALLS           1    2    2    2    1    1    *    *    1    1    2    1     13
HAVRE                 *    2    1    1    1    0    *    *    *    1    2    1      9
HELENA                2    1    1    *    *    *    *    *    *    1    1    2      8
KALISPELL             5    5    2    1    1    1    1    1    2    5    5    5     33
MILES CITY            1    2    1    1    1    *    *    *    1    1    1    2     10
MISSOULA              5    4    1    *    *    *    *    *    1    3    5    6     27


NEVADA

ELKO                  1    1    1    *    *    *    *    *    *    *    1    1      6
ELY                   *    *    *    *    *    *    *    *    *    *    *    *      2
LAS VEGAS             *    *    *    0    0    0    0    0    *    *    *    *      1
RENO                  2    1    *    *    *    0    *    *    *    *    1    3      7
WINNEMUCCA            2    1    *    *    0    *    0    0    0    *    *    1      4


NEW MEXICO

ALBUQUERQUE           1    1    1    *    *    *    *    *    *    *    1    2      6
CLAYTON               1    1    2    1    1    1    1    *    1    1    1    1     12
ROSWELL               3    3    1    *    *    *    *    *    1    2    2    2     14


OREGON

ASTORIA               4    3    3    2    2    1    2    4    6    7    4    4     41
BURNS                 4    2    1    *    *    *    *    *    *    *    1    4     12
EUGENE                9    7    4    2    1    1    *    1    4   11   10   10     60
MEACHAM               4    4    5    3    2    1    *    *    1    2    4    4     31
MEDFORD              12    6    2    1    *    *    *    *    1    4   11   14     49
PENDLETON             8    5    2    *    *    *    0    *    *    1    6    9     31
PORTLAND              4    4    2    1    *    *    *    *    3    7    6    5     33
SALEM                 6    4    2    1    1    *    *    *    2    7    6    7     36
SEXTON SUMMIT        19   17   19   14   14   10    6    6    7   13   17   18    160


UTAH

MILFORD               1    1    1    *    *    0    0    *    *    *    1    2      7
SALT LAKE CITY        4    2    *    *    *    0    0    0    0    *    1    4     12
WENDOVER              2    1    0    0    0    0    0    0    0    0    *    2      5


WASHINGTON

OLYMPIA              10    8    8    5    3    2    3    5    9   14   11   10     89
QUILLAYUTE            4    3    4    2    3    3    5    8    7    7    4    4     53
SEATTLE-TACOMA AP     5    4    2    1    1    1    2    3    5    7    5    6     41
SEATTLE URBAN SITE    
SPOKANE               9    7    3    1    1    1    *    *    1    4    9   12     48
STAMPEDE PASS        24   22   23   21   21   21   17   19   15   20   23   26    252
WALLA WALLA           3    2    *    0    *    0    0    0    *    *    3    5     14
YAKIMA                5    2    1    *    *    0    *    0    *    1    3    7     19


WYOMING

CASPER                1    1    1    1    1    *    *    *    1    1    1    1      9
CHEYENNE              1    2    3    3    3    2    1    1    2    2    2    1     24
LANDER                1    1    *    *    *    *    0    *    *    *    1    1      4
SHERIDAN              1    1    1    *    *    *    *    *    *    1    1    1      6