Washington September-May Average Temperature
Degrees Fahrenheit
1901-2000
-99
189605
39.8
-1.1
189705
40.0
-0.9
189805
40.2
-0.7
189905
38.7
-2.2
190005
43.1
2.2
190105
40.6
-0.3
190205
41.4
0.5
190305
39.6
-1.3
190405
40.2
-0.7
190505
42.4
1.5
190605
40.9
0.0
190705
39.7
-1.2
190805
41.4
0.5
190905
39.6
-1.3
191005
40.6
-0.3
191105
40.2
-0.7
191205
40.1
-0.8
191305
38.8
-2.1
191405
41.9
1.0
191505
41.4
0.5
191605
38.5
-2.4
191705
37.5
-3.4
191805
42.1
1.2
191905
41.7
0.8
192005
38.5
-2.4
192105
40.8
-0.1
192205
37.7
-3.2
192305
39.8
-1.1
192405
42.2
1.3
192505
41.5
0.6
192605
43.2
2.3
192705
39.9
-1.0
192805
40.7
-0.2
192905
38.3
-2.6
193005
40.3
-0.6
193105
41.6
0.7
193205
39.4
-1.5
193305
39.6
-1.3
193405
44.6
3.7
193505
41.2
0.3
193605
39.9
-1.0
193705
38.9
-2.0
193805
42.4
1.5
193905
42.1
1.2
194005
43.7
2.8
194105
43.3
2.4
194205
40.8
-0.1
194305
40.2
-0.7
194405
41.3
0.4
194505
41.9
1.0
194605
41.3
0.4
194705
41.2
0.3
194805
40.2
-0.7
194905
38.2
-2.7
195005
38.3
-2.6
195105
40.9
0.0
195205
39.8
-1.1
195305
42.6
1.7
195405
41.5
0.6
195505
39.3
-1.6
195605
39.0
-1.9
195705
39.6
-1.3
195805
43.6
2.7
195905
41.1
0.2
196005
39.7
-1.2
196105
41.8
0.9
196205
39.4
-1.5
196305
41.9
1.0
196405
41.5
0.6
196505
40.2
-0.7
196605
41.9
1.0
196705
42.5
1.6
196805
42.6
1.7
196905
39.3
-1.6
197005
41.1
0.2
197105
39.9
-1.0
197205
39.6
-1.3
197305
40.5
-0.4
197405
40.8
-0.1
197505
40.7
-0.2
197605
41.1
0.2
197705
41.7
0.8
197805
41.1
0.2
197905
38.7
-2.2
198005
41.6
0.7
198105
43.1
2.2
198205
40.7
-0.2
198305
42.5
1.6
198405
40.4
-0.5
198505
38.9
-2.0
198605
39.2
-1.7
198705
42.6
1.7
198805
42.6
1.7
198905
41.4
0.5
199005
42.9
2.0
199105
41.3
0.4
199205
44.7
3.8
199305
40.3
-0.6
199405
42.9
2.0
199505
42.4
1.5
199605
41.4
0.5
199705
40.6
-0.3
199805
43.0
2.1
199905
42.1
1.2
200005
42.6
1.7
200105
40.6
-0.3
200205
41.6
0.7
200305
42.8
1.9
200405
42.7
1.8
200505
43.1
2.2
200605
41.7
0.8
200705
41.8
0.9
200805
40.3
-0.6
200905
40.6
-0.3
201005
42.0
1.1
201105
40.3
-0.6
201205
41.6
0.7
201305
42.4
1.5
201405
41.6
0.7
201505
44.9
4.0