548  
NOUS46 KSEW 271516 AAA  
PNSSEW  
 
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  
 

 
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