Portland Weather Information

Portland historical weather data by month.

Chance Of Sunshine

ANNUAL CHANCE OF SUNSHINE 49.18032787%
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Annual chance of sunshine: 49.18032787%
Month
% Sunny
Clear Days
Partly Cloudy Days
Cloudy Days
January
35.48%
5
6
20
February
41.38%
5
7
17
March
38.71%
5
7
19
April
43.33%
6
7
17
May
51.61%
7
9
15
June
60.00%
6
12
12
July
64.52%
8
12
11
August
65.63%
9
12
11
September
60.00%
9
9
12
October
56.25%
10
8
14
November
36.67%
5
6
19
December
32.26%
4
6
21

Temperature

JULY HIGH 84.1° - JANUARY LOW 15.2°
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Month
Average
Max Average
Min Average
January
23.8°
32.3°
15.2°
February
27.5°
36.8°
18.1°
March
37.7°
47.9°
27.5°
April
48.9°
60.1°
37.7°
May
60.2°
71.4°
49°
June
69.4°
80.4°
58.4°
July
72.9°
84.1°
61.6°
August
70.3°
82.1°
58.5°
September
63.3°
76.2°
50.4°
October
51.6°
64.2°
38.9°
November
40.5°
50.1°
30.8°
December
29.3°
37.7°
20.9°

Rainfall

Average Annual Rainfall 37.9 inches
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Month
Average Rainfall
January
1.89 Inches
February
1.84 Inches
March
2.69 Inches
April
3.5 Inches
May
4.06 Inches
June
4.42 Inches
July
4.4 Inches
August
3.65 Inches
September
3.02 Inches
October
2.62 Inches
November
3.23 Inches
December
2.58 Inches

Sum Of Heating & Cooling Degree Days

Potential Demand For Energy
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Month
Heating Degree Days
Cooling Degree Days
January
1277
0
February
1052
0
March
846
0
April
485
1
May
211
60
June
30
162
July
4
248
August
25
189
September
105
55
October
424
7
November
736
0
December
1106
0