Portland Weather Information

Portland historical weather data by month.

Chance Of Sunshine

ANNUAL CHANCE OF SUNSHINE 57.19%
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Annual chance of sunshine: 57.19%
Month
% Sunny
Clear Days
Partly Cloudy Days
Cloudy Days
January
40.00%
6
6
18
February
46.43%
7
6
15
March
48.39%
8
7
16
April
55.17%
8
8
13
May
58.06%
8
10
13
June
66.67%
8
12
10
July
67.74%
8
13
10
August
70.97%
10
12
9
September
66.67%
11
9
10
October
67.74%
13
8
10
November
53.33%
9
7
14
December
45.16%
7
7
17

Temperature

JULY HIGH 88.3° - JANUARY LOW 26°
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Month
Average
Max Average
Min Average
January
34.5°
42.9°
26°
February
38.9°
48.3°
29.5°
March
48.3°
58.4°
38.1°
April
57.6°
68.2°
47°
May
66.4°
76.2°
56.6°
June
74.6°
84°
65.2°
July
78.8°
88.3°
69.2°
August
77.3°
87.3°
67.3°
September
70.7°
81.1°
60.2°
October
59°
70°
48°
November
48.6°
57.8°
39.3°
December
38.6°
47.2°
30°

Rainfall

Average Annual Rainfall 53.29 inches
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Month
Average Rainfall
January
4.23 Inches
February
4.14 Inches
March
5.55 Inches
April
4.23 Inches
May
5.51 Inches
June
4.58 Inches
July
4.46 Inches
August
3.58 Inches
September
3.79 Inches
October
3.43 Inches
November
4.73 Inches
December
5.06 Inches

Sum Of Heating & Cooling Degree Days

Potential Demand For Energy
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Month
Heating Degree Days
Cooling Degree Days
January
947
0
February
732
0
March
520
0
April
242
20
May
90
133
June
3
292
July
0
426
August
0
381
September
28
198
October
227
41
November
496
2
December
818
0