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Comparative Climate
 
Washington
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  Pan Evaporation
 

Standard daily pan evaporation is measured using the four-foot diameter Class A evaporation pan. The pan water level reading is adjusted when precipitation is measure to obtain the actual evaporation. Most Class A pans are installed aboveground, allowing effects such as radiation on the side walls and heat exchnges with the pan material. These effects tend to increase the evaporation totals. The amounts can then be adjusted by multiplying the totals b 0.70 or 0.80 to more closely estimate the evaporation from naturally existing urfaces such as a shallow lake, wet soil or other moist natural surfaces.

Many stations do not measure pan evaportation during winter months. A "0.00" total indicates no measuement is taken.

Stations marked with an asterisk * have estimated totals computed from meteorological measurements using a form of the Penman equation.

 
 
 
period of record
jan
feb
mar
apr
may
jun
july
aug
sept
oct
nov
dec
year
Bellingham 2 N
1948-1985
M
M
M
2.75
4.59
5.35
6.28
5.56
3.34
1.22
M
M
29.09
Bellingham 3 SSW
1985-2002
M
M
M
M
3.79
4.70
5.27
4.54
2.69
1.37
M
M
22.36
Bumping Lake
1931-1967
M
M
M
M
4.01
4.13
5.58
4.63
3.19
2.34
M
M
23.88
Connell 1 W
1960-2002
M
M
M
5.43
8.32
9.92
11.96
10.80
6.90
3.00
M
M
56.33
Eltopia 6 W
1954-1973
M
M
3.23
5.46
6.61
7.73
9.36
7.56
4.93
2.45
0.83
M
48.16
Eltopia 8 WSW
1974-2002
M
M
M
4.45
6.11
7.03
8.09
7.05
4.46
2.06
0.62
M
39.87
Lind 3 NE Exp Stn
1931-2002
M
M
M
5.31
8.03
9.39
12.03
10.44
6.90
2.59
M
M
54.69
Olympia Airport *
 
0.60
1.20
1.90
2.80
4.00
4.60
5.80
4.90
3.10
1.50
0.80
0.50
31.70
Oroville 1 S
1960-1970
M
M
M
4.49
5.82
6.36
7.42
6.22
4.28
1.99
M
M
36.58
Puyallup 2 W Exp Stn
1931-1995
M
0.71
1.58
2.46
3.97
4.63
5.61
4.97
2.92
1.28
0.61
M
28.74
Seattle-Tacoma Airport *
 
1.20
1.60
2.30
3.20
5.10
5.80
7.00
5.50
3.50
2.00
1.20
1.00
39.40
Spokane WB Airport *
 
0.60
1.10
2.30
4.00
6.30
7.80
10.70
8.60
5.40
2.60
0.90
0.50
50.80
Spokane WSO Airport
1889-2002
M
M
M
4.66
7.27
8.57
11.28
10.22
6.41
M
M
M
48.41
Tatoosh Island Airport *
 
1.60
1.60
2.10
2.50
3.20
3.40
3.00
2.50
2.30
1.80
1.60
1.20
26.70
Wenatchee Exp Stn
1950-1997
M
M
M
4.74
6.87
7.87
9.38
7.83
4.19
M
M
M
40.88
Whitman Mission
1962-2002
M
M
M
4.61
6.59
8.17
10.36
9.10
5.54
2.84
M
M
47.21
Yakima WB Airport *
 
0.80
1.40
2.90
4.50
6.60
7.80
9.80
7.90
5.30
2.90
1.30
0.70
51.90
Yakima WSO Airport
1946-2002
M
M
M
5.27
7.62
8.71
10.42
9.29
5.90
M
M
M
47.21
 
  State Extremes
 
* Also at earlier dates at the same time or other places
 
 
date or year
location
value
Record Highest Temp
5-Aug-61
Ice Harbor Dam
118.00
Record Lowest Temp
30-Dec-68
Mazama & Winthrop
-48.00
Highest Average Annual Temp
  
Lower Granite Dam
55.60
Lowest Average Annual Temp
  
Mt. Spokane Summit
36.50
Consecutive Days Max >= 70
Jul-Aug 1961
Trinidad 2 SSE
48 days
Consecutive Days Min <= 32
Oct 36-May 37
Bumping Lake
201 days
       
Record Maximum Annual Precip
1931
Wynoochee Oxbow
184.56
Record Minimum Annual Precip
1930
Wahluke
2.61
Record Maximum 24-hour Precip
23-24 Nov 1986
Mt. Mitchell #2
14.26
Highest Average Annual Precip
  
Quinalt Rngr Stn
137.21
Lowest Average Annual Precip
  
Priest Rapids Dam
6.84
Consecutive Days Measurable Precip
Nov 96-Feb 97
Centralia
55 days
Consecutive Days with no Measurable Precip
Apr-Sep 1973
White Swan
140 days
       
Record Maximum Winter Snowfall
1998-99
Mount Baker Ski Area
1140.00
Record Maximum 1-Day Snowfall
21-Jan-35
Winthrop
52.00
Highest Average Annual Snowfall
  
Rainier Paradise RS
680.00
 
  Precipitation
(mean monthly & annual number of hrs with measurable precip with % of hrs and maximum 1-hr totals)
 

* = Less than 1/2 hour

Maximum 1-hour totals are based on data from top of the hour. Maximum 60-minute totals will be greater.
 
 
period of record
jan
feb
mar
apr
may
jun
july
aug
sept
oct
nov
dec
year
hour
inches
Olympia
1954-1999
175
139
138
97
58
43
21
27
44
92
165
176
1175
13
0.82
Quillayute
1966-1999
236
204
204
163
113
84
52
50
72
147
227
247
1799
21
1.01
Seattle-Tacoma Airport
1965-1999
137
107
104
74
48
37
21
25
40
71
124
134
822
9
0.63
Spokane
1948-1999
77
59
53
36
39
29
14
15
20
35
71
83
531
6
0.75
Stampede Pass
1948-1999
254
205
204
163
118
103
51
59
86
141
223
260
1867
21
0.81
Walla Walla
1948-1987
74
56
51
34
34
26
9
14
21
36
61
70
486
6
1.20
Yakima
1949-1999
45
29
23
16
15
15
6
8
10
17
35
44
263
3
0.72
 
  Sunshine Days
(mean monthly & annual % of possible sunshine)
 

Only the first order stations record possible sunshine.

For more information click here on Western States, Alaska or Hawaii and Pacific Island
 
 
jan
feb
mar
apr
may
jun
july
aug
sept
oct
nov
dec
annual
Olympia
22
30
34
35
37
35
43
44
47
34
21
19
33
Seattle-Tacoma Airport
28
40
50
52
56
56
65
65
62
43
28
23
47
Seattle Urban Site
28
34
42
47
52
49
63
56
53
37
28
23
43
Spokane
28
41
55
61
65
67
80
78
72
55
29
23
54
Walla Walla
24
35
51
62
67
72
86
83
73
59
31
19
59