This data is based on daylight hours only. A clear day denotes zero to 3/10 average sky cover. Partly cloudy is 4/10 to 7/10 tenths. Cloudy is 8/10 to 10/10 tenths. There is no table for partly cloudy. Simply add number of clear days with cloudy days and subtract from total days in the month to get number of partly cloudy days. Annual totals may differ from the 12 month totals due to rounding.
Cloudiness is based on time-averaged ceilometer data for clouds at or below 12,000 feet and on satellite data for clouds abover 12,000 ft.
(m) - In Barrow, the sun sets below the horizon on November 18 and does not rise again until January 24. Data is incomplete between these dates.
For more information, click one of the following: Western States, Alaska, or Hawaii and Pacific Islands
MEAN MONTHLY AND ANNUAL NUMBER OF CLOUDY DAYS
JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANNUAL
ALASKA
ANCHORAGE 19 18 18 18 20 20 22 21 21 21 20 21 239
ANNETTE 23 21 23 21 21 21 21 21 21 25 24 24 265
BARROW 3m 11 10 12 23 21 21 26 26 25 11m 0m 187m
BETHEL 18 14 16 17 20 21 24 26 23 22 19 18 239
BETTLES 11 14 16 13 13 13 19 21 16 21 14 15 187
BIG DELTA
COLD BAY 23 22 23 26 27 27 28 29 26 25 23 24 304
FAIRBANKS 16 14 14 16 15 17 19 21 20 22 18 18 210
GULKANA
HOMER 19 17 19 18 20 18 19 18 18 21 19 18 225
JUNEAU 23 21 23 22 23 22 23 22 24 27 24 25 280
KING SALMON 18 16 18 20 22 24 25 25 22 20 19 19 245
KODIAK 20 18 18 19 22 21 22 20 19 17 16 19 232
KOTZEBUE 16 13 13 13 14 14 19 21 19 19 17 16 193
MCGRATH 17 15 15 15 19 19 21 23 22 22 19 19 226
NOME 17 13 14 14 16 15 20 22 20 18 18 17 205
ST. PAUL ISLAND 23 20 21 22 26 26 28 28 24 23 22 24 287
TALKEETNA 21 16 18 18 19 17 19 17 19 20 19 22 225
VALDEZ 22 20 19 19 21 21 23 21 22 23 20 24 254
YAKUTAT 22 21 22 21 24 24 25 24 24 25 23 24 278
ARIZONA
FLAGSTAFF 12 11 12 9 7 4 9 8 5 7 8 11 102
PHOENIX 10 9 8 6 3 2 4 4 3 4 6 9 70
TUCSON 10 9 9 6 4 3 9 7 4 5 6 10 81
WINSLOW 12 10 9 7 5 4 8 6 4 6 8 10 89
YUMA 9 6 6 4 2 1 3 3 2 3 5 8 52
CALIFORNIA
BAKERSFIELD 17 13 12 9 5 2 1 1 2 5 10 16 93
BISHOP 12 10 9 7 6 3 2 2 2 5 7 9 75
BLUE CANYON 17 15 17 13 11 6 1 2 3 9 15 17 126
EUREKA 19 17 18 16 15 13 14 15 13 14 17 18 188
FRESNO 19 13 12 8 5 2 1 1 2 5 11 18 98
LONG BEACH 11 11 11 8 8 6 2 2 4 7 8 10 87
LOS ANGELES AP 11 11 11 9 10 9 5 5 6 8 8 10 103
LOS ANGELES CITY 9 9 9 8 8 6 1 1 3 6 6 8 73
MT SHASTA CITY 16 13 15 10 10 7 2 2 4 9 13 16 118
OAKLAND 15 13 12 9 8 5 3 3 4 8 11 14 105
REDDING 18 14 17 13 10 5 1 2 3 6 11 16 116
RED BLUFF 17 15 15 11 9 5 1 2 3 8 15 18 119
SACRAMENTO 19 13 12 8 5 2 1 1 2 6 12 17 100
SANDBERG 11 11 11 8 6 2 1 1 2 5 8 12 78
SAN DIEGO 11 10 11 10 11 9 5 4 6 8 7 10 102
SAN FRANCISCO AP 15 13 13 10 8 5 3 3 4 7 11 14 105
SAN FRANCISCO CI
SANTA BARBARA
SANTA MARIA 11 10 10 8 7 4 2 2 4 5 8 10 80
STOCKTON 19 15 13 10 5 3 1 1 2 6 12 18 104
COLORADO
ALAMOSA 8 7 9 8 8 4 6 6 5 6 7 7 81
COLORADO SPRINGS 11 11 13 12 12 8 7 8 7 8 10 11 118
DENVER 11 11 13 13 13 8 6 8 8 9 10 10 120
GRAND JUNCTION 15 13 15 13 11 6 6 6 5 8 12 13 122
PUEBLO 10 11 12 11 11 7 5 7 6 8 9 10 107
HAWAII & PACIFIC ISLANDS
HILO 13 13 18 20 19 17 18 17 15 16 17 15 197
HONOLULU 9 8 9 10 9 6 5 6 6 8 9 9 94
KAHULUI 8 7 9 10 8 6 5 5 6 8 8 8 90
LIHUE 10 9 12 13 11 9 10 9 7 10 12 11 125
GUAM 16 17 14 15 15 19 23 26 23 21 15 16 219
JOHNSTON 4 4 6 11 12 8 9 11 11 12 12 7 107
KOROR 24 22 22 20 22 25 26 26 24 23 22 25 283
KWAJALEIN 22 20 22 24 25 24 25 24 24 26 23 24 282
MAJURO 24 20 23 23 24 23 24 22 23 23 23 24 276
PAGO PAGO 21 19 19 18 17 15 15 14 13 17 19 20 206
PONAPE 26 23 26 25 26 25 24 24 24 24 23 25 296
TRUK (CHUUK) 27 25 27 26 27 26 27 27 26 27 26 28 319
WAKE 5 5 5 6 6 7 13 14 12 10 5 4 94
YAP 23 20 22 20 20 24 26 28 25 24 22 22 275
IDAHO
BOISE 22 17 18 15 13 8 3 4 6 11 18 20 155
LEWISTON 24 21 21 19 16 13 6 7 9 15 22 24 196
POCATELLO 22 18 18 16 14 9 5 5 7 11 18 21 162
MONTANA
BILLINGS 18 16 18 17 15 11 6 7 10 13 17 17 164
GLASGOW 18 16 17 16 15 11 7 8 11 15 17 18 168
GREAT FALLS 19 18 18 18 17 14 6 8 11 15 18 18 180
HAVRE 20 17 18 17 15 13 6 7 13 16 18 19 179
HELENA 20 17 19 18 16 13 6 7 11 14 18 20 179
KALISPELL 25 21 21 20 17 14 7 9 12 18 23 26 214
MILES CITY 17 15 18 17 15 12 4 5 10 11 16 16 156
MISSOULA 24 21 22 20 17 14 6 8 11 17 23 25 208
NEVADA
ELKO 17 15 17 15 13 7 4 4 5 9 15 16 136
ELY 15 14 15 13 12 6 5 5 5 9 12 14 125
LAS VEGAS 11 9 9 7 5 3 3 3 2 4 7 10 73
RENO 16 14 14 12 10 6 3 3 4 8 13 15 114
WINNEMUCCA 18 16 17 14 12 8 4 4 5 9 15 16 138
NEW MEXICO
ALBUQUERQUE 10 10 10 8 7 4 5 5 6 6 7 10 87
CLAYTON 12 10 11 10 10 6 7 6 7 7 9 10 104
ROSWELL 11 8 8 7 6 3 5 6 9 7 7 7 84
OREGON
ASTORIA 24 22 23 21 20 19 15 15 14 19 22 24 239
BURNS 18 17 18 15 12 9 5 3 6 12 17 18 151
EUGENE 25 21 22 19 17 14 7 8 9 17 23 26 209
MEACHAM 25 22 22 20 17 13 5 7 10 17 22 24 204
MEDFORD 24 19 19 16 13 9 3 4 6 12 21 25 169
PENDLETON 24 20 19 15 13 10 4 5 7 13 20 24 173
PORTLAND 24 21 23 21 19 16 10 10 12 18 23 26 222
SALEM 24 21 21 19 18 15 8 9 10 17 22 25 208
SEXTON SUMMIT 21 20 21 17 14 10 3 4 7 14 20 22 172
UTAH
MILFORD 14 12 13 11 9 5 5 5 4 7 11 13 111
SALT LAKE CITY 19 16 16 14 12 6 4 4 5 9 15 18 139
WENDOVER 15 12 13 14 11 7 4 4 5 8 15 13 121
WASHINGTON
OLYMPIA 25 22 22 20 18 16 11 12 13 20 23 26 228
QUILLAYUTE 24 21 22 21 20 20 16 16 14 19 22 24 239
SEATTLE-TACOMA AP 24 21 22 20 18 17 11 12 13 19 23 25 226
SEATTLE URBAN SITE 23 19 19 16 14 15 9 11 13 18 21 23 201
SPOKANE 24 20 19 17 15 12 6 7 9 15 22 24 191
STAMPEDE PASS 26 23 24 22 20 19 10 11 14 20 25 27 241
WALLA WALLA 23 19 16 13 11 8 3 4 7 13 20 25 162
YAKIMA 22 18 17 14 12 10 4 6 7 13 19 22 164
WYOMING
CASPER 16 14 16 16 15 9 6 7 8 12 14 15 147
CHEYENNE 13 12 14 14 14 9 7 8 9 9 11 13 133
LANDER 13 12 14 14 14 9 6 6 8 10 12 12 129
SHERIDAN 17 15 17 16 15 11 6 6 9 12 16 17 157