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WASHINGTON PRECIPITATION SUMMARY...AMENDED
NATIONAL WEATHER SERVICE SEATTLE WA
716 AM PST FRI JAN 27 2023
DECEMBER BROUGHT NEAR TO ABOVE NORMAL PRECIPITATION TO WESTERN
WASHINGTON, AND ABOVE NORMAL PRECIPITATION TO EASTERN WASHINGTON.
WITH DECEMBER BEING THE FINAL MONTH OF 2022, NEARLY ALL OF
WASHINGTON SAW NEAR NORMAL PRECIPITATION, WITH ONLY THE PALOUSE AND
BLUE MOUNTAIN REGION SEEING ABOVE NORMAL PRECIPITATION FOR THE YEAR.
AS FOR THE WATER YEAR, MOST OF WESTERN WASHINGTON IS BELOW NORMAL
WITH ONLY THE NORTHWEST INTERIOR, PUGET SOUND LOWLANDS AND SOUTHWEST
INTERIOR REGIONS SEEING NEAR NORMAL CONDITIONS. ON THE OTHER HAND,
EASTERN WASHINGTON IS SEEING NEAR TO ABOVE NORMAL CONDITIONS.
FOR WESTERN WASHINGTON, THE MONTHLY PERCENTAGE OF NORMAL FOR
PRECIPITATION RANGED FROM 96 PERCENT FOR THE WESTERN SLOPES OF THE
CASCADES, TO 122 PERCENT IN THE OLYMPICS. THE GREATEST AMOUNT OF
PRECIPITATION AT THE CLIMATE STATIONS FOR THE MOUNTAINS, COAST AND
INTERIOR LOWLANDS WAS 21.12 INCHES AT COUGAR ON THE WESTERN SLOPES
OF THE CASCADES, 14.74 AT QUILLAYUTE, AND 13.41 INCHES AT BREMERTON
IN THE PUGET SOUND LOWLANDS.
FOR EASTERN WASHINGTON, THE PERCENTAGE OF NORMAL FOR PRECIPITATION
RANGED FROM 113 PERCENT ON THE EASTERN SLOPES OF THE CASCADES TO 138
PERCENT IN THE OKANOGAN REGION. THE GREATEST AMOUNT OF
PRECIPITATION AT THE CLIMATE STATIONS FOR THE MOUNTAINS AND LOWLANDS
WAS 11.15 INCHES AT MOUNT ADAMS ON THE EASTERN SLOPES OF THE
CASCADES, AND 4.79 AT NEWPORT IN THE NORTHEAST REGION.
THE OUTLOOK FOR DECEMBER AND BEYOND FOR WASHINGTON STATE, FOR THE
NEXT TWO WEEKS THE OUTLOOK IS FOR ABOVE NORMAL PRECIPITATION. THE
MONTHLY OUTLOOK FOR JANUARY CALLS FOR ABOVE NORMAL PRECIPITATION FOR
NEARLY ALL OF THE STATE, EXCEPT FOR EQUAL CHANCES OF ABOVE, BELOW
AND NEAR NORMAL PRECIPITATION FOR THE NORTHEAST CORNER OF THE STATE.
THE THREE MONTH OUTLOOK FOR JANUARY THROUGH MARCH CALLS FOR ABOVE
NORMAL PRECIPITATION.
THE TABLE BELOW GIVES PRECIPITATION FIGURES AS A PERCENT OF NORMAL
FOR REGIONS OF WASHINGTON. THE CURRENT WATER YEAR BEGAN 1 OCTOBER
2022 AND ENDS 30 SEPTEMBER 2023.
DECEMBER WATER YEAR PAST 3 PAST 12
2022 TO DATE MONTHS MONTHS
WESTERN WASHINGTON
COAST 106 88 88 98
OLYMPICS 122 89 89 91
NORTHWEST INTERIOR 109 98 98 94
PUGET SOUND LOWLANDS 119 93 93 100
SOUTHWEST INTERIOR 101 96 96 103
WEST FOOTHILLS CASCA 101 86 86 95
CASCADES WEST 96 83 83 96
EASTERN WASHINGTON
EAST SLOPES CASCADES 113 96 96 100
OKANOGAN 138 111 111 106
CENTRAL BASIN 131 109 109 102
NORTHEAST 132 96 96 92
PALOUSE AND BLUE MTN 128 132 132 129
THE TABLE BELOW EXPRESSES PRECIPITATION IN INCHES AND AS A PERCENT OF
NORMAL FOR A VARIETY OF LOCATIONS AROUND THE STATE. OCCASIONALLY
MISSING DATA AT A SITE ARE ESTIMATED USING OBSERVED DATA FROM
SURROUNDING STATIONS.
DECEMBER WATER YEAR PAST 12 MONTHS
INCHES PCT INCHES PCT INCHES PCT
QUILLAYUTE 14.74 107 34.57 87 96.34 95
HOQUIAM 11.14 106 25.19 89 70.32 102
BELLINGHAM 5.03 111 14.06 100 35.08 98
SEATTLE 7.55 132 15.53 97 40.91 104
OLYMPIA 7.73 98 19.08 90 51.29 101
LONGVIEW 6.59 92 17.59 94 45.99 96
CONCRETE 11.42 110 25.97 89 64.26 90
SNOQUALMIE FALL* 8.53 101 20.73 86 60.05 95
RANDLE* 6.63 101 18.99 85 53.97 95
DIABLO DAM 11.15 96 26.16 77 68.78 89
STAMPEDE PASS 10.74 85 34.18 97 88.11 104
PARADISE 18.83 100 40.57 84 112.42 97
WINTHROP 3.84 149 7.09 119 16.62 109
STEHEKIN 7.33 102 13.71 78 37.26 101
LEAVENWORTH 4.35 96 10.65 97 26.48 103
MOUNT ADAMS 11.15 129 21.22 104 49.24 107
WENATCHEE 1.86 142 3.62 130 9.92 127
YAKIMA 2.17 151 3.05 104 7.07 88
COULEE DAM 2.59 182 4.57 128 10.81 98
LIND 2.02 144 3.73 103 10.83 107
REPUBLIC 2.59 118 5.55 105 18.46 102
SPOKANE 3.59 153 7.23 125 17.72 108
PULLMAN 3.02 137 8.86 149 24.83 142
DAYTON 2.24 97 7.25 115 24.21 129
* = ESTIMATED
GRUB
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