Average afternoon relative humidity values based on late afternoon readings when lowest values generally occur. The observation times (Local Standard Time) of afternoon humidities are shown after the city (column "LST").
For more information, click one of the following: Western States, Alaska, or Hawaii and Pacific Islands
MEAN MONTHLY AND ANNUAL PERCENT RELATIVE HUMIDITY (AFTERNOON) 1996 - 2010
LST JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANNUAL
ALASKA
ANCHORAGE 15 72 67 57 54 50 56 62 65 64 67 74 76 64
ANNETTE 15 76 73 68 66 65 67 69 71 73 78 77 79 72
BARROW 15 73 70 71 76 84 85 83 87 88 85 80 74 80
BETHEL 15 76 72 74 72 63 62 68 72 70 76 80 76 72
BETTLES 15 67 63 59 60 49 47 54 61 63 72 72 72 62
BIG DELTA 15 66 62 54 45 39 47 52 53 55 70 71 70 57
COLD BAY 15 82 81 78 77 76 80 82 83 80 77 82 85 80
FAIRBANKS 15 69 63 52 45 37 42 50 54 54 66 72 71 56
GULKANA 15 71 66 55 46 40 43 48 49 52 67 76 74 57
HOMER 15 77 73 68 65 65 67 71 72 71 70 75 78 71
JUNEAU 15 77 75 70 63 63 67 72 75 79 82 81 82 74
KING SALMON 15 74 68 65 61 56 59 64 66 65 69 77 76 67
KODIAK 15 75 72 66 66 70 75 76 74 73 67 70 73 71
KOTZEBUE 15 72 69 69 74 77 78 76 75 72 75 76 74 74
MCGRATH 15 71 62 52 49 45 48 55 60 59 69 74 74 60
NOME 15 72 67 68 72 70 70 74 75 68 68 73 72 71
ST. PAUL ISLAND 15 83 84 83 82 83 84 89 90 83 78 81 82 84
TALKEETNA 15 68 64 59 53 50 55 61 64 64 69 71 73 63
VALDEZ 15 75 69 66 63 64 67 71 73 74 73 71 76 70
YAKUTAT 15 81 78 72 70 72 74 78 79 79 80 80 84 77
ARIZONA
CHANDLER-WILMS AFB 13 41 36 32 22 18 18 29 33 31 31 32 42 30
DAVIS-MONTHAN AFB 13 35 32 28 20 17 16 29 34 28 28 30 35 28
FLAGSTAFF 17 50 45 41 32 26 21 39 43 37 36 44 50 39
FORT HUACHUCA 13 36 31 24 21 17 19 36 44 36 32 30 39 30
GILA BEND AFB 13 40 34 29 20 17 14 25 28 25 27 30 42 28
LUKE AFB 13 40 34 30 22 18 16 27 32 29 30 32 41 29
PHOENIX 17 32 26 24 16 13 11 20 23 23 22 27 33 22
TUCSON 17 31 26 22 16 13 13 28 32 28 24 28 34 25
WINSLOW 17 51 35 27 20 17 14 26 29 28 28 35 50 30
YUMA 16 28 24 21 17 15 13 22 24 24 23 27 32 23
CALIFORNIA
ALAMEDA NAS 16 68 65 62 59 60 60 62 63 60 60 64 69 63
BAKERSFIELD 16 62 51 42 33 26 23 21 24 29 34 50 62 38
BEALE AFB-MARYSVLLE 13 70 58 57 45 36 33 32 34 37 43 58 68 48
BISHOP 16 34 28 22 17 16 14 14 14 15 18 27 35 21
BLUE CANYON 16 58 61 61 54 47 39 34 34 42 48 60 59 50
CAMP PENDLETON MCAS 16 54 57 60 57 61 60 59 60 59 58 54 54 58
CHINA LAKE NAF 16 34 29 25 20 17 14 14 15 16 19 26 33 22
DAGGETT-BARSTOW AP 16 34 28 27 20 17 14 17 19 19 20 25 32 23
EDWARDS AFB 13 40 36 36 26 22 17 17 20 22 24 32 40 28
EL TORO MCAS-IRVINE 16 54 55 57 54 57 57 53 55 54 55 52 53 55
EUREKA
FORT ORD-MONTEREY 13 62 64 65 63 65 67 71 69 67 64 59 59 65
FRESNO 16 67 56 46 34 26 23 21 25 28 34 54 69 40
IMPERIAL BEACH NALF 16 67 68 67 67 68 70 71 72 72 71 68 67 69
LEMOORE NAS 16 63 54 44 32 25 23 23 26 28 32 49 64 38
LONG BEACH 16 51 52 53 50 54 55 52 53 54 53 53 52 53
LOS ANGELES AP 16 59 62 65 64 66 67 68 68 66 64 61 60 64
LOS ANGELES CITY 16 50 52 52 54 55 56 53 55 54 56 49 50 53
MATHER AFB-SACRMNTO 13 70 58 57 45 36 33 30 33 36 42 59 71 47
MCCLELLAN AFB-SAC 13 72 61 58 45 36 33 31 34 37 44 62 72 49
MERCED-CASTLE AFB 13 75 64 58 44 35 35 30 33 36 44 58 75 49
MIRAMAR NAS 16 56 57 59 58 60 60 57 58 58 59 56 55 58
MOFFETT FIELD NAS 16 62 59 56 52 53 54 58 58 55 54 59 63 57
MONTEREY AP 16 64 67 66 62 64 64 66 67 67 67 66 64 65
MT SHASTA CITY 16 69 60 52 43 42 38 29 28 33 47 64 70 48
NORTH ISLAND NAS 16 61 63 63 64 67 68 69 70 69 66 62 61 65
OAKLAND 16 72 69 66 62 66 68 68 68 64 63 69 71 67
ONTARIO AP 15 45 44 50 42 44 39 35 36 38 37 36 39 40
OXNARD-PT MUGU PMTC 16 61 64 67 68 70 71 71 71 70 69 63 61 67
REDDING 16 56 39 43 34 31 25 18 19 25 30 48 51 35
RED BLUFF 16 59 51 44 35 29 23 18 19 21 32 51 62 37
RIVERSIDE-MARCH AFB 13 42 43 46 40 40 36 31 33 35 36 37 39 38
SACRAMENTO 16 70 59 53 43 35 31 28 29 31 38 58 70 45
SANDBERG 16 56 50 52 50 47 38 28 29 33 42 50 59 44
SAN BERNARDINO-NRTN 13 37 39 44 38 40 37 30 32 35 37 37 37 37
SAN CLEMENTE 16 70 72 70 68 71 72 73 73 74 72 72 73 72
SAN DIEGO 16 56 58 59 59 64 66 66 66 65 63 61 58 62
SAN FRANCISCO AP 16 66 64 62 59 59 58 59 61 58 59 63 67 61
SAN FRANCISCO CI 16 63 63 61 61 68 72 74 73 66 60 63 63 66
SAN NICOLAS ISLAND 16 63 67 67 64 65 65 66 67 64 65 62 63 65
SANTA BARBARA 16 55 55 54 57 58 64 63 63 62 62 57 57 59
SANTA MARIA 16 58 61 63 60 60 60 60 62 62 61 61 58 60
STOCKTON 16 71 60 51 41 32 28 26 28 30 37 60 71 45
TUSTIN MCAS 16 56 57 57 55 58 59 57 57 56 57 56 56 57
TWENTYNINE PALMS 16 36 33 27 23 19 15 18 24 18 23 28 33 25
VANDENBERG AFB 13 56 59 65 63 67 68 70 69 67 62 57 56 63
VICTORVILLE-GRG AFB 13 37 32 32 25 22 18 19 22 24 26 33 40 27
COLORADO
ALAMOSA 17 58 49 38 28 27 26 36 38 34 44 48 60 40
COLORADO SPRINGS 17 46 41 38 34 36 34 39 41 37 36 44 48 40
DENVER 17 49 44 40 35 38 35 34 35 34 36 49 52 40
GRAND JUNCTION 17 61 47 36 27 24 19 22 24 26 33 46 59 35
PUEBLO 17 50 40 34 29 32 28 32 34 32 32 43 50 36
HAWAII & PACIFIC ISLANDS
HILO 14 66 65 67 70 67 65 68 68 69 70 70 68 68
HONOLULU 14 62 59 57 56 54 52 52 51 52 56 59 61 56
KAHULUI 14 64 62 60 59 56 55 56 55 55 58 60 62 58
LIHUE 14 67 66 67 67 67 65 66 66 65 68 69 68 67
GUAM 16 76 74 73 72 72 75 78 80 80 80 80 78 76
JOHNSTON
KOROR 15 76 75 74 74 77 78 78 77 76 77 77 77 76
KWAJALEIN 18 71 70 71 74 78 78 78 77 77 77 76 74 75
MAJURO 18 74 73 75 78 78 78 77 76 76 76 77 76 76
PAGO PAGO 13 76 76 75 76 76 76 75 73 73 75 76 75 75
PONAPE 15 75 72 74 75 76 78 76 77 76 76 77 77 76
TRUK (CHUUK) 17 76 74 75 76 78 78 77 76 76 77 77 78 76
WAKE 12 66 65 67 68 68 68 70 71 71 71 70 67 69
YAP 16 76 74 73 72 76 78 78 78 78 78 78 77 76
IDAHO
BOISE 17 68 57 43 35 31 28 21 23 29 37 57 68 41
LEWISTON 16 70 60 49 42 38 35 25 25 32 47 68 73 47
POCATELLO 17 70 62 51 38 35 31 24 23 28 37 59 70 44
MONTANA
BILLINGS 17 56 52 46 40 42 39 31 30 37 41 53 57 44
GLASGOW 17 72 71 58 42 40 39 33 31 38 46 63 73 50
GREAT FALLS 17 60 54 49 41 41 38 29 30 38 42 55 61 45
HAVRE 17 69 69 53 41 36 36 27 25 35 42 59 70 47
HELENA 17 62 54 46 38 38 36 29 30 36 42 57 66 44
KALISPELL 17 74 67 54 42 43 45 35 35 43 53 72 79 54
MILES CITY 17 69 69 55 47 44 41 30 28 40 46 64 71 50
MISSOULA 17 76 66 52 41 43 42 31 32 40 50 71 80 52
NEVADA
ELKO 16 59 52 42 34 30 26 19 20 22 28 48 59 37
ELY 16 55 50 44 35 31 24 22 24 25 32 37 56 37
FALLON NAS 16 51 41 32 26 25 21 18 18 21 28 41 51 31
LAS VEGAS 16 30 26 21 16 13 10 15 17 17 19 26 32 20
LAS VEGAS-NELLIS 13 31 28 24 19 16 14 19 22 20 21 26 32 23
RENO 16 50 40 33 28 26 22 18 20 22 27 42 51 32
TONOPAH TEST RNGE 13 45 37 29 22 19 16 18 22 20 25 35 42 28
WINNEMUCCA 16 55 46 37 29 26 22 15 16 20 28 46 57 33
NEW MEXICO
ALAMOGORDO-HOLLOMAN 13 40 34 25 22 20 23 32 38 37 35 32 42 32
ALBUQUERQUE 17 40 32 24 19 18 18 27 30 31 30 36 43 29
CLAYTON 17 44 39 32 28 32 34 39 40 42 38 46 52 39
CLOVIS-CANNON AFB 13 39 41 31 29 32 39 37 41 41 42 35 43 38
ROSWELL 17 40 34 24 22 24 27 32 37 41 36 38 40 33
OREGON
ASTORIA 16 77 74 70 69 69 70 69 70 69 72 77 80 72
BURNS 16 68 60 47 35 33 30 21 22 25 37 57 70 42
EUGENE 16 79 72 64 58 54 49 39 40 44 61 79 83 60
MEACHAM 16 79 73 61 60 50 45 26 34 40 57 80 85 58
MEDFORD 16 71 58 50 44 39 33 26 27 30 44 68 76 47
PENDLETON 16 73 63 49 42 37 31 23 26 32 44 68 76 47
PORTLAND 16 74 66 59 55 52 49 44 44 48 60 73 78 58
SALEM 16 75 69 61 57 54 49 40 40 45 60 76 80 59
SEXTON SUMMIT 16 77 69 67 62 53 51 40 40 43 57 76 80 60
UTAH
DUGWAY PROVING GND 13 58 53 41 33 28 25 20 22 27 34 47 62 37
MILFORD 17 60 54 37 28 23 17 20 21 20 28 46 60 35
OGDEN-HILL AFB 13 65 58 52 39 40 31 28 29 34 44 54 61 45
SALT LAKE CITY 17 69 59 47 39 33 26 22 23 29 41 58 71 43
WENDOVER 17 59 47 32 27 23 21 14 19 20 31 51 60 34
WASHINGTON
FORT LEWIS-GRAY AFB 13 76 73 67 60 58 55 53 52 56 67 76 77 64
OLYMPIA 16 80 71 62 57 54 54 50 50 55 68 80 84 64
QUILLAYUTE 16 84 77 72 67 66 66 64 66 67 75 83 86 73
SEATTLE-TACOMA AP 16 74 67 61 57 54 53 49 50 57 67 75 77 62
SEATTLE URBAN SITE
SPOKANE 16 78 69 55 44 41 36 27 28 35 49 76 82 52
STAMPEDE PASS 16 91 88 84 78 70 70 59 63 66 78 91 94 78
TACOMA-MCCHORD AFB 13 72 69 62 58 57 57 57 55 59 65 72 73 63
WALLA WALLA
WHIDBEY ISLAND NAS 16 75 72 69 66 67 68 68 69 70 75 77 78 71
YAKIMA 16 70 57 40 33 31 30 26 28 32 41 62 74 44
WYOMING
CASPER 17 60 57 48 41 39 32 26 24 30 40 56 62 43
CHEYENNE 17 49 48 47 42 44 41 38 38 38 41 50 52 44
LANDER 17 60 54 45 39 36 31 27 26 32 40 56 62 42
SHERIDAN 17 64 60 50 43 46 44 33 30 38 45 61 65 48