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Portland, Oregon
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Climate Data Summary
Portland Airport, Oregon
NORMALS, MEANS, AND EXTREMES

LATITUDE: 45 Deg. 36 Min. N LONGITUDE: 122 Deg. 36 Min. W ELEVATION: FT. GRND 21 BARO 27 TIME ZONE: PACIFIC WBAN: 24229

(a)
JAN
FEB
MAR
APR
MAY
JUN
JUL
AUG
SEP
OCT
NOV
DEC
YEAR
TEMPERATURE (Deg. F)
Normals
-Daily Maximum
-Daily Minimum
-Monthly
Extremes
-Record Highest
-Year
-Record Lowest
-Year






55

55



45.4
33.7
39.6

63
1986
-2
1950


51.0
36.1
43.6

71
1988
-3
1950


56.0
38.6
47.3

80
1947
19
1989


60.6
41.3
51.0

87
1957
29
1955


67.1
47.0
57.1

100
1983
29
1954


74.0
52.9
63.5

100
1992
39
1966


79.9
56.5
68.2

107
1965
43
1955


80.3
56.9
68.6

107
1981
44
1980


74.6
52.0
63.3

105
1988
34
1965


64.0
44.9
54.5

92
1987
26
1971


52.6
39.5
46.1

73
1975
13
1985


45.6
34.8
40.2

65
1993
6
1964


62.6
44.5
53.6

107
AUG 1981
-3
FEB 1950
NORMAL DEGREE DAYS
Heating (base 65 Deg. F)
Cooling (base 65 Deg. F)




787
0

599
0

549
0

420
0

249
0

91
46

28
127

35
147

102
51

326
0

567
0

769
0

4522
371
% OF POSSIBLE SUNSHINE
46
29
38
48
52
57
56
69
66
62
44
28
23
48
MEAN SKY COVER(tenths)
Sunrise - Sunset
MEAN NUMBER OF DAYS:
Sunrise to Sunset
-Clear
-Partly Cloudy
-Cloudy
Precipitation
.01 inches or more
Snow, Ice Pellets, Hail
1.0 inches or more
Thunderstorms
Heavy Fog Visibility
1/4 mile or less
Temperature Deg. F
-Maximum
90 Deg. F and above
32 Deg. F and below
-Minimum
32 Deg. F and below
0 Deg. F and below

47


47
47
47

55

55
55

53


55
55

55
55

8.4


2.9
3.6
24.4

18.0

1.0
0.*

4.3


0.0
2.1

13.0
0.*

8.2


2.9
3.8
21.5

15.6

0.3
0.1

3.7


0.0
0.3

8.1
0.*

8.0


3.3
4.9
22.8

16.9

0.1
0.5

2.4


0.0
0.*

4.6
0.0

7.8


3.5
5.8
20.7

14.4

0.0
0.9

1.1


0.0
0.0

0.9
0.0

7.2


5.0
7.2
18.9

11.8

0.*
1.5

0.2


0.3
0.0

0.1
0.0

6.7


6.2
7.7
16.1

9.2

0.0
0.9

0.1


1.2
0.0

0.0
0.0

4.8


12.6
8.5
9.9

3.9

0.0
0.8

0.1


3.6
0.0

0.0
0.0

5.1


11.4
9.6
10.1

4.9

0.0
1.0

0.2


3.7
0.0

0.0
0.0

5.5


10.3
8.1
11.6

7.5

0.0
0.7

2.6


1.8
0.0

0.0
0.0

7.1


5.4
7.6
18.0

12.3

0.0
0.4

7.1


0.1
0.0

0.6
0.0

8.2


2.8
4.3
22.9

18.0

0.1
0.3

6.0


0.0
0.2

5.1
0.0

8.7


2.1
3.3
25.5

18.7

0.5
0.1

4.8


0.0
0.8

9.6
0.0

7.1


68.4
74.5
222.4

150.9

2.1
7.1

32.6


10.8
3.5

42.1
*
AV. STATION PRES. (mb)
23
1018.1
1016.6
1015.2
1016.7
1016.2
1016.1
1016.2
1015.2
1015.5
1017.2
1017.2
1018.4
1016.5
RELATIVE HUMIDITY (%)
Hour 04
Hour 10 (Local Time)
Hour 16
Hour 22

55
55
55
55

85
82
75
83

86
80
67
81

86
73
60
78

86
69
55
75

85
66
53
73

84
65
49
71

82
62
45
68

94
64
45
70

87
67
48
75

90
78
62
94

88
82
74
84

87
83
78
85

86
73
59
77
PRECIPITATION (in.)
Water Equivalent
-Normal
-Maximum Monthly
-Year
-Minimum Monthly
-Year
-Maximum in 24 hrs
-Year
Snow, Ice Pellets, Hail
-Maximum Monthly
-Year
-Maximum in 24 hrs
-Year



55

55

55


55

55



5.35
12.83
1953
0.06
1985
2.61
1974

41.4
1950
10.6
1950


3.85
9.46
1949
0.72
1993
2.46
1994

13.2
194
6.4
1993


3.56
7.52
1957
1.10
1965
1.83
1943

12.9
1951
7.7
1951


2.39
5.26
1993
0.53
1956
1.47
1962

T
1995
T
1995


2.06
4.57
1945
0.10
1992
1.47
1968

0.6
1953
0.5
1953


1.48
4.06
1984
0.03
1951
1.82
1958

T
1995
T
1995


0.63
2.68
1.83
0.00
1967
1.09
1978

0.0

0.0



1.09
4.53
1968
T
1970
1.54
1977

T
1989
T
1989


1.75
4.30
1986
T
1993
2.38
1982

T
1949
T
1949


2.7
8.41
1994
0.19
1988
4.44
1994

0.2
19.0
0.2
1950


5.34
11.57
1942
0.77
1976
2.82
1995

8.2
1955
7.4
1977


6.13
11.12
1968
1.38
1976
2.59
1977

15.7
1968
8.0
1964


36.30
12.83
JAN 1953
0.00
JUL 1967
4.44
OCT 1994

41.4
JAN 1950
10.6
JAN 1950
WIND
Mean Speed (mph)
Prevailing Direction
through 1964
Fastest Mile
-Direction(!!)
-Speed(mph)
-Year
Peak Gust
-Direction(!!)
-Speed(mph)
-Date

47



41
41


12
12


10.0

ESE

S
54
1951

SW
63
1990

9.2

ESE

SW
61
1958

SE
61
1989

8.3

ESE

S
57
1963

S
59
1995

7.4

NW

S
60
1957

SW
45
1992

7.1

NW

SW
42
1960

W
46
1993

7.2

NW

SW
40
1958

SW
40
1994

7.6

NW

SW
33
1983

NW
32
1992

7.1

NW

SW
29
1961

SW
31
1995

6.5

NW

S
61
1963

E
44
1995

6.5

ESE

S
88
1962

S
52
1994

8.6

ESE

SW
56
1961

SW
52
1984

9.6

ESE

S
57
1951

17
71
1995

7.9

ESE

S
88
OCT 1962

17
71
DEC 1995
(a) - Length of Record in Years, although individual months may be missing.
0.* or * - The value is between 0.0 and 0.05.
Normals - Based on the 1961 - 1990 record period.
Extremes - Dates are the most recent occurrence.
Wind Dir.- Numerals show tens of degrees clockwise from true north. "00" indicates calm.
Resultant Directions are given to whole degrees.


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