2001 PORTLAND, OREGON (PDX)



The Portland Weather Service Office is located 6 miles north–northeast of downtown Portland. Portland is situated about 65 miles inland from the Pacific Coast and midway between the northerly oriented low coast range on the west and the higher Cascade range on the east, each about 30 miles distant. The airport lies on the south bank of the Columbia River. The coast range provides limited shielding from the Pacific Ocean. The Cascade range provides a steep slope for orographic lift of moisture–laden westerly winds and consequent moderate rainfall, and also forms a barrier from continental air masses originating over the interior Columbia Basin. Airflow is usually northwesterly in Portland in spring and summer and southeasterly in fall and winter. The Portland Airport location is drier than most surrounding localities.

Portland has a very definite winter rainfall climate. Approximately 88 percent of the annual total occurs in the months of October through May, 9 percent in June and September, while only 3 percent comes in July and August. Precipitation is mostly rain, as on the average there are only five days each year with measurable snow. Snowfalls are seldom more than a couple of inches, and generally last only a few days.

The winter season is marked by relatively mild temperatures, cloudy skies and rain with southeasterly surface winds predominating. Summer produces pleasantly mild temperatures, northwesterly winds and very little precipitation. Fall and spring are transitional in nature. Fall and early winter are times with most frequent fog.

At all times, incursions of marine air are a frequent moderating influence. Outbreaks of continental high pressure from east of the Cascade Mountains produce strong easterly flow through the Columbia Gorge into the Portland area. In winter this brings the coldest weather with the extremes of low temperature registered in the cold air mass. Freezing rain and ice glaze are sometimes transitional effects. Temperatures below zero are very infrequent. In summer, hot, dry continental air brings the highest temperatures. Temperatures above 100 degrees are infrequent, but 90 degrees or higher are reached every year, but seldom persist for more than two or three days.

Destructive storms are infrequent in the Portland area. Surface winds seldom exceed gale force and rarely in the period of record have winds reached higher than 75 mph. Thunderstorms occur about once a month through the spring and summer months. Heavy downpours are infrequent but gentle rains occur almost daily during winter months.

Most rural areas around Portland are farmed for berries, green beans, and vegetables for fresh market and processing. The long growing season with mild temperatures and ample moisture favors local nursery and seed industries.

Based on the 1951–1980 period, the average first occurrence of 32 degrees Fahrenheit in the fall is November 7 and the average last occurrence in the spring is April 3.

NORMALS, MEANS, AND EXTREMES

PORTLAND, OR (PDX)

LATITUDE:    LONGITUDE:     ELEVATION (FT):    TIME ZONE:    WBAN: 24229

45 35′ 27″ N  122 36′ 01″ W  GRND:  220  BARO: � A0;223  PACIFIC (UTC + 8)

2001 Portland, Oregon (PDX)

ELEMENT POR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC YEAR
TEMPERATURE F NORMAL DAILY MAXIMUM 30 45.4 51.0 56.0 60.6 67.1 74.0 79.9 80.3 74.6 64.0 52.6 45.6 62.6
MEAN DAILY MAXIMUM 71 44.7 50.1 55.7 61.3 67.6 73.1 79.6 79.5 74.5 64.0 52.6 46.3 62.4
HIGHEST DAILY MAXIMUM 61 63 71 80 90 100 100 107 107 105 92 73 65 107
YEAR OF OCCURRENCE 1986 1988 1947 1998 1983 1992 1965 1981 1988 1987 1975 1993 AUG 1981
MEAN OF EXTREME MAXS. 71 56.8 60.6 68.7 77.7 85.7 90.5 95.5 94.6 90.2 78.6 63.6 57.7 76.7
NORMAL DAILY MINIMUM 30 33.7 36.1 38.6 41.3 47.0 52.9 56.5 56.9 52.0 44.9 39.5 34.8 44.5
MEAN DAILY MINIMUM 71 34.1 36.4 39.0 42.4 47.8 53.1 56.7 56.9 52.4 45.9 39.9 35.9 45.0
LOWEST DAILY MINIMUM 61 -2 -3 19 29 29 39 43 44 34 26 13 6 -3
YEAR OF OCCURRENCE 1950 1950 1989 1955 1954 1966 1955 1980 1965 1971 1985 1964 FEB 1950
MEAN OF EXTREME MINS. 71 21.4 24.5 29.4 33.8 38.4 45.7 49.5 49.2 42.9 34.7 28.5 24.1 35.2
NORMAL DRY BULB 30 39.6 43.6 47.3 51.0 57.1 63.5 68.2 68.6 63.3 54.5 46.1 40.2 53.6
MEAN DRY BULB 71 39.4 43.2 47.4 51.9 57.8 63.2 68.2 68.2 63.4 54.9 46.2 41.1 53.7
MEAN WET BULB 17 38.8 40.1 44.0 47.8 52.2 56.2 56.3 57.1 54.0 50.6 44.2 35.9 48.1
MEAN DEW POINT 17 35.3 35.7 39.5 43.1 47.4 50.9 50.8 51.7 48.9 46.6 41.2 32.6 43.6
NORMAL NO. DAYS WITH:
MAXIMUM 90 30 0.0 0.0 0.0 0.0 0.4 1.4 4.0 4.5 1.6 0.1 0.0 0.0 12.0
MAXIMUM 32 30 1.7 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.2 1.4 3.4
MINIMUM 32 30 12.4 7.7 4.2 1.1 0.1 0.0 0.0 0.0 0.0 0.6 4.6 10.4 41.1
MINIMUM 0 30 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
H/C NORMAL HEATING DEG. DAYS 30 787 599 549 420 249 91 28 35 102 326 567 769 4522
NORMAL COOLING DEG. DAYS 30 0 0 0 0 0 46 127 147 51 0 0 0 371
RH NORMAL (PERCENT) 30 81 78 75 72 69 66 63 65 69 78 82 83 73
HOUR 04 LST 30 85 85 85 85 84 82 80 82 86 90 87 86 85
HOUR 10 LST 30 82 80 75 70 66 64 61 64 67 78 82 83 73
HOUR 16 LST 30 74 66 59 55 52 49 44 44 48 60 73 78 58
HOUR 22 LST 30 82 80 77 74 72 69 66 68 74 82 83 84 76
S PERCENT POSSIBLE SUNSHINE 46 28 38 48 52 57 56 69 66 62 44 28 23 48
W/O MEAN NO. DAYS WITH:
HEAVY FOG(VISBY 1/4 MI) 59 4.3 3.7 2.3 1.1 0.1 0.1 0.1 0.2 2.6 6.7 5.7 4.7 31.6
THUNDERSTORMS 61 0.1 0.1 0.5 0.9 1.4 0.9 0.8 1.0 0.7 0.4 0.3 0.1 7.2
CLOUDINESS MEAN:
SUNRISE-SUNSET (OKTAS) 47 6.7 6.6 6.4 6.2 5.8 5.4 3.8 4.0 4.3 5.6 6.4 6.8 5.7
MIDNIGHT-MIDNIGHT (OKTAS) 31 6.3 6.0 5.7 5.7 5.3 4.9 3.6 3.6 3.9 5.0 6.3 6.4 5.2
MEAN NO. DAYS WITH:
CLEAR 47 2.9 2.9 3.3 3.5 5.0 6.2 12.6 11.4 10.3 5.4 2.8 2.1 68.4
PARTLY CLOUDY 47 3.6 3.8 4.9 5.8 7.2 7.7 8.5 9.6 8.1 7.6 4.3 3.3 74.4
CLOUDY 47 24.4 21.5 22.8 20.7 18.9 16.1 9.9 10.1 11.6 18.0 22.9 25.5 222.4
PR MEAN STATION PRESSURE(IN) 29 30.09 29.99 30.00 30.00 30.00 30.00 30.00 30.00 30.00 30.00 30.00 30.10 30.02
MEAN SEA-LEVEL PRES. (IN) 17 30.09 30.04 30.06 30.06 30.03 30.04 30.05 30.02 30.02 30.08 30.07 30.14 30.06
WINDS MEAN SPEED (MPH) 47 9.9 9.4 8.3 7.5 7.2 7.3 7.6 7.1 6.5 6.6 8.6 9.6 8.0
PREVAIL. DIR (TENS OF DEGS) 31 12 12 12 32 32 32 33 33 32 12 12 12 32
MAXIMUM 2-MINUTE:
SPEED (MPH) 6 43 40 43 37 33 34 24 26 31 37 43 38 43
DIR. (TENS OF DEGS) 20 10 21 18 24 20 18 32 07 11 20 19 20
YEAR OF OCCURRENCE 2000 2000 1999 1996 2000 1997 1996 1999 2000 1999 1998 2001 JAN 2000
MAXIMUM 5-SECOND:
SPEED (MPH) 6 59 51 51 46 40 40 29 33 40 43 51 51 59
DIR. (TENS OF DEGS) 19 17 20 09 24 20 18 17 08 12 21 22 19
YEAR OF OCCURRENCE 2000 1996 1999 1999 2000 1997 1996 1997 2000 1999 1998 1996 JAN 2000
PRECIPITATION NORMAL (IN) 30 5.35 3.85 3.56 2.39 2.06 1.48 0.63 1.09 1.75 2.67 5.34 6.13 36.30
MAXIMUM MONTHLY (IN) 61 12.83 10.03 7.52 5.26 5.55 4.06 2.68 4.53 4.30 8.41 11.57 13.35 13.35
YEAR OF OCCURRENCE 1953 1996 1957 1993 1998 1984 1983 1968 1986 1994 1942 1996 DEC 1996
MINIMUM MONTHLY (IN) 61 0.06 0.72 1.10 0.53 0.10 0.03 0.00 T T 0.19 0.77 1.38 0.00
YEAR OF OCCURRENCE 1985 1993 1965 1956 1992 1951 1967 1970 1993 1988 1976 1976 JUL 1967
MAXIMUM IN 24 HOURS (IN) 61 2.61 2.46 1.83 1.47 1.47 1.82 1.09 1.54 2.38 4.44 4.10 2.59 4.44
YEAR OF OCCURRENCE 1974 1994 1943 1962 1968 1958 1978 1977 1982 1994 1996 1977 OCT 1994
NORMAL NO. DAYS WITH:
PRECIPITATION 0.01 30 17.5 15.5 17.1 14.3 11.8 8.5 4.2 5.3 8.0 12.0 18.5 18.7 151.4
PRECIPITATION 1.00 30 1.1 0.4 0.2 0.2 0.1 0.1 0.0 0.1 0.2 0.2 0.8 1.1 4.5
SNOWFALL NORMAL (IN) 30 1.8 0.9 0.1 T T 0.0 0.0 0.0 0.0 0.0 0.5 2.0 5.3
MAXIMUM MONTHLY (IN) 55 41.4 13.2 12.9 T 0.6 T 0.0 T T 0.2 8.2 15.7 41.4
YEAR OF OCCURRENCE 1950 1949 1951 1995 1953 1995 1989 1949 1950 1955 1968 JAN 1950
MAXIMUM IN 24 HOURS (IN) 55 10.6 6.4 7.7 T 0.5 T 0.0 T T 0.2 7.4 8.0 10.6
YEAR OF OCCURRENCE 1950 1993 1951 1995 1953 1995 1989 1949 1950 1977 1964 JAN 1950
MAXIMUM SNOW DEPTH (IN) 48 15 14 5 0 0 0 0 0 0 0 5 11 15
YEAR OF OCCURRENCE 1950 1950 1951 1977 1964 JAN 1950
NORMAL NO. DAYS WITH:
SNOWFALL 1.0 30 0.6 0.3 0.* 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.1 0.7 1.7

2001 Portland, Oregon (PDX)

PRECIPITATION (inches) 2001 PORTLAND, OR (PDX)
YEAR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANNUAL
1972 5.71 4.08 5.41 2.98 2.23 0.68 0.56 0.67 3.06 0.87 3.78 8.79 38.82
1973 3.69 1.94 2.45 1.33 1.43 1.45 0.06 1.41 3.29 3.14 11.55 9.93 41.67
1974 8.51 4.61 5.65 1.76 1.74 0.80 2.01 0.07 0.21 2.14 6.73 6.05 40.28
1975 8.43 4.75 3.45 1.88 1.35 1.13 0.43 2.10 T 4.76 4.10 6.68 39.06
1976 5.14 4.92 2.93 2.34 2.29 0.78 0.66 3.29 0.73 1.48 0.77 1.38 26.71
1977 1.07 2.49 3.50 1.04 4.30 0.83 0.39 3.26 3.33 2.28 5.56 8.98 37.03
1978 4.85 3.28 1.49 3.96 3.17 1.69 1.36 2.05 2.07 0.36 3.83 2.51 30.62
1979 2.55 6.53 2.51 2.47 2.41 0.64 0.25 1.18 1.75 4.85 3.38 7.23 35.75
1980 8.51 4.01 3.11 2.58 2.19 2.50 0.19 0.39 1.56 1.18 6.47 9.72 42.41
1981 1.47 3.86 2.33 1.79 2.25 3.23 0.24 0.15 1.86 4.12 4.62 8.37 34.29
1982 6.31 5.98 2.38 3.56 0.46 1.66 0.94 1.66 3.98 4.44 3.51 8.16 43.04
1983 6.23 7.78 6.80 1.87 1.30 1.95 2.68 2.29 0.39 1.95 8.65 5.30 47.19
1984 2.01 3.93 3.19 3.20 3.41 4.06 T 0.09 1.46 3.85 9.74 2.56 37.50
1985 0.06 1.79 3.08 1.07 1.52 2.34 0.55 0.48 2.76 2.75 3.89 2.19 22.48
1986 4.65 5.31 2.60 1.91 2.19 0.23 1.20 0.10 4.30 1.99 6.26 4.30 35.04
1987 6.93 2.45 4.91 1.94 1.63 0.14 1.03 0.35 0.30 0.27 1.96 8.00 29.91
1988 4.95 1.17 3.13 4.57 2.53 2.34 0.69 0.10 1.76 0.19 7.92 2.37 31.72
1989 3.30 2.84 6.73 2.08 2.87 0.78 0.91 1.07 1.48 1.73 3.18 3.08 30.05
1990 7.95 3.43 2.52 2.31 2.37 1.94 0.32 0.95 0.34 4.65 3.68 2.40 32.86
1991 2.56 3.65 4.64 4.05 3.34 2.31 0.07 0.70 0.02 1.51 6.36 4.34 33.55
1992 4.31 4.12 1.87 3.82 0.10 0.60 0.67 0.49 1.12 2.87 4.55 4.98 29.50
1993 3.06 0.72 4.39 5.26 4.36 1.69 2.41 0.37 T 1.59 1.50 5.01 30.36
1994 3.56 4.92 1.84 1.91 0.56 1.67 0.07 0.13 1.13 8.41 5.91 4.85 34.96
1995 5.56 3.19 3.82 3.49 1.65 2.62 1.23 0.81 1.31 3.15 11.15 5.35 43.33
1996 7.15 10.03 3.24 5.12 4.88 0.44 0.73 0.25 3.05 5.39 9.58 13.35 63.21
1997 7.32 1.63 7.14 3.73 3.63 2.83 0.52 1.58 1.98 6.40 4.02 3.03 43.81
1998 6.77 5.27 4.06 1.04 5.55 1.73 0.59 T 1.09 2.16 11.02 6.74 46.02
1999 6.63 8.73 4.03 1.56 1.97 1.73 0.51 0.75 0.10 2.44 6.81 3.62 38.88
2000 5.66 4.50 3.21 1.82 2.70 1.19 0.15 0.12 1.67 3.25 2.46 3.47 30.20
2001 1.47 1.29 3.11 2.85 0.91 1.79 0.95 0.74 0.70 3.12 6.89 6.62 30.44
POR=61 YRS 5.42 4.08 3.69 2.44 2.23 1.60 0.61 0.87 1.60 3.18 5.63 5.84 37.19

2001 Portland, Oregon (PDX)

AVERAGE TEMPERATURE (F) 2001 PORTLAND, OR (PDX)
YEAR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANNUAL
1972 39.2 43.8 49.8 48.0 60.2 64.0 70.9 71.7 61.2 53.0 48.2 37.4 54.0
1973 39.0 44.9 47.9 52.3 59.4 63.9 70.3 65.9 64.4 54.3 44.2 44.7 54.3
1974 38.0 43.0 47.2 51.3 55.7 64.4 67.1 68.9 67.3 55.2 48.1 44.1 54.2
1975 41.5 41.2 45.0 47.3 57.5 61.9 69.0 65.3 65.7 53.5 46.0 42.7 53.1
1976 42.2 42.1 44.4 50.3 56.6 60.4 67.2 65.5 64.2 54.7 47.0 39.5 52.8
1977 35.7 44.6 45.5 52.9 53.8 63.9 66.3 71.7 60.8 53.8 43.3 42.0 52.9
1978 40.1 44.7 49.1 50.5 54.7 65.1 68.4 67.6 60.9 54.7 39.1 35.3 52.5
1979 30.7 42.9 50.8 53.1 60.1 65.1 70.5 68.6 66.3 58.1 45.0 44.4 54.6
1980 35.1 42.5 46.3 53.8 57.3 60.7 68.9 66.4 63.8 56.0 48.5 44.0 53.6
1981 43.9 44.0 48.8 52.5 57.5 61.8 67.5 72.2 64.9 53.3 48.8 42.7 54.8
1982 39.7 43.6 48.5 49.0 57.6 66.0 67.5 68.6 63.2 54.9 44.4 41.7 53.7
1983 44.4 47.3 50.7 52.7 60.4 62.8 66.5 69.1 61.5 54.2 49.3 36.4 54.6
1984 42.2 45.9 51.1 50.4 56.4 62.2 69.1 69.4 63.7 52.9 46.7 38.3 54.0
1985 36.1 41.1 45.8 53.9 58.3 64.4 74.1 69.3 60.8 52.7 37.3 33.0 52.2
1986 42.5 43.7 51.3 50.2 57.6 66.3 65.3 72.3 61.5 57.0 47.7 40.6 54.7
1987 39.6 45.2 48.7 54.2 60.4 66.5 67.2 70.5 65.5 58.2 48.8 39.1 55.3
1988 39.0 44.7 47.2 52.2 56.4 62.4 68.4 68.0 64.0 58.3 47.5 42.0 54.2
1989 42.2 36.0 45.6 56.0 58.0 64.3 65.5 66.1 65.3 54.9 48.6 40.3 53.6
1990 43.4 41.9 49.4 54.5 56.7 63.6 71.2 70.9 67.0 53.9 48.4 34.7 54.6
1991 38.9 48.8 46.2 50.8 54.7 59.9 69.9 70.1 67.4 55.4 47.5 42.7 54.4
1992 44.5 48.1 52.3 55.4 63.1 67.4 70.2 69.8 62.3 55.9 46.3 39.3 56.2
1993 36.5 40.1 47.9 52.6 61.1 62.5 64.3 68.5 65.7 57.4 41.5 41.4 53.3
1994 44.5 40.9 50.2 54.2 60.7 62.9 71.1 70.2 67.6 54.1 42.7 42.3 55.1
1995 43.4 46.5 48.3 51.3 60.7 63.8 70.6 67.3 67.1 54.5 51.7 42.4 55.6
1996 40.7 41.6 47.7 53.5 55.3 63.2 72.0 70.4 61.8 54.0 45.5 41.6 53.9
1997 41.0 42.9 46.7 51.0 62.2 62.7 68.9 71.6 65.9 53.7 49.8 41.1 54.8
1998 43.0 46.1 48.8 52.8 56.3 63.4 71.0 71.0 66.9 54.3 48.9 40.5 55.3
1999 42.8 43.7 45.8 50.7 54.9 61.2 67.2 69.0 64.6 55.1 50.1 43.9 54.1
2000 39.8 43.7 45.6 54.0 57.6 65.3 67.8 67.8 63.9 55.2 42.8 40.4 53.7
2001 41.2 42.0 48.0 49.6 59.4 61.0 66.5 69.2 65.1 53.6 48.0 42.0 53.8
POR=61 YRS 39.3 43.3 46.8 51.3 57.4 61.5 66.8 66.9 63.4 54.4 46.0 40.8 53.2

REFERENCE NOTES:

PAGE 1:

THE TEMPERATURE GRAPH SHOWS NORMAL MAXIMUM AND NORMAL MINIMUM DAILY TEMPERATURES (SOLID CURVES) AND THE ACTUAL DAILY HIGH AND LOW TEMPERATURES (VERTICAL BARS).

PAGE 2 AND 3:

H/C INDICATES HEATING AND COOLING DEGREE DAYS.

RH INDICATES RELATIVE HUMIDITY

W/O INDICATES WEATHER AND OBSTRUCTIONS

S INDICATES SUNSHINE.

PR INDICATES PRESSURE.

CLOUDINESS ON PAGE 3 IS THE SUM OF THE CEILOMETER AND SATELLITE DATA NOT TO EXCEED EIGHT EIGHTHS (OKTAS).

GENERAL:

T INDICATES TRACE PRECIPITATION, AN AMOUNT GREATER THAN ZERO BUT LESS THAN THE LOWEST REPORTABLE VALUE.

+ INDICATES THE VALUE ALSO OCCURS ON EARLIER DATES.

BLANK ENTRIES DENOTE MISSING OR UNREPORTED DATA.

NORMALS ARE 30–YEAR AVERAGES (1961–1990).

ASOS INDICATES AUTOMATED SURFACE OBSERVING SYSTEM.

PM INDICATES THE LAST DAY OF THE PREVIOUS MONTH.

POR (PERIOD OF RECORD) BEGINS WITH THE JANUARY DATA MONTH AND IS THE NUMBER OF YEARS USED TO COMPUTE THE MEAN. INDIVIDUAL MONTHS WITHIN THE POR MAY BE MISSING.

WHEN THE POR FOR A NORMAL IS LESS THAN 30 YEARS, THE NORMAL IS PROVISIONAL AND IS BASED ON THE NUMBER OF YEARS INDICATED.

0.* OR * INDICATES THE VALUE OR MEAN–DAYS–WITH IS BETWEEN 0.00 AND 0.05.

CLOUDINESS FOR ASOS STATIONS DIFFERS FROM THE NON–ASOS OBSERVATION TAKEN BY A HUMAN OBSERVER. ASOS STATION CLOUDINESS IS BASED ON TIME–AVERAGED CEILOMETER DATA FOR CLOUDS AT OR BELOW 12,000 FEET AND ON SATELLITE DATA FOR CLOUDS ABOVE 12,000 FEET.

THE NUMBER OF DAYS WITH CLEAR, PARTLY CLOUDY, AND CLOUDY CONDITIONS FOR ASOS STATIONS IS THE SUM OF THE CEILOMETER AND SATELLITE DATA FOR THE SUNRISE TO SUNSET PERIOD.

GENERAL CONTINUED:

CLEAR INDICATES 0–2 OKTAS, PARTLY CLOUDY INDICATES 3–6 OKTAS, AND CLOUDY INDICATES 7 OR 8 OKTAS. WHEN AT LEAST ONE OF THE ELEMENTS (CEILOMETER OR SATELLITE) IS MISSING, THE DAILY CLOUDINESS IS NOT COMPUTED.

WIND DIRECTION IS RECORDED IN TENS OF DEGREES (2 DIGITS) CLOCKWISE FROM TRUE NORTH. "00" INDICATES CALM. "36" INDICATES TRUE NORTH.

RESULTANT WIND IS THE VECTOR AVERAGE OF THE SPEED AND DIRECTION.

AVERAGE TEMPERATURE IS THE SUM OF THE MEAN DAILY MAXIMUM AND MINIMUM TEMPERATURE DIVIDED BY 2.

SNOWFALL DATA COMPRISE ALL FORMS OF FROZEN PRECIPITATION, INCLUDING HAIL.

A HEATING (COOLING) DEGREE DAY IS THE DIFFERENCE BETWEEN THE AVERAGE DAILY TEMPERATURE AND 65 F.

DRY BULB IS THE TEMPERATURE OF THE AMBIENT AIR.

DEW POINT IS THE TEMPERATURE TO WHICH THE AIR MUST BE COOLED TO ACHIEVE 100 PERCENT RELATIVE HUMIDITY.

WET BULB IS THE TEMPERATURE THE AIR WOULD HAVE IF THE MOISTURE CONTENT WAS INCREASED TO 100 PERCENT RELATIVE HUMIDITY.

ON JULY 1, 1996, THE NATIONAL WEATHER SERVICE BEGAN USING THE "METAR" OBSERVATION CODE THAT WAS ALREADY EMPLOYED BY MOST OTHER NATIONS OF THE WORLD. THE MOST NOTICEABLE DIFFERENCE IN THIS ANNUAL PUBLICATION WILL BE THE CHANGE IN UNITS FROM TENTHS TO EIGHTS (OKTAS) FOR REPORTING THE AMOUNT OF SKY COVER.

2001 Portland, Oregon (PDX)

HEATING DEGREE DAYS (base 65 F) 2001 PORTLAND, OR (PDX)
YEAR JUL AUG SEP OCT NOV DEC JAN FEB MAR APR MAY JUN TOTAL
1972-73 10 6 153 363 497 848 799 560 525 378 202 89 4430
1973-74 6 47 59 326 618 624 832 610 545 403 282 72 4424
1974-75 32 16 29 301 500 640 722 660 615 523 240 127 4405
1975-76 24 41 48 354 565 686 698 658 632 437 258 155 4556
1976-77 15 41 47 319 536 783 901 564 596 358 340 68 4568
1977-78 40 19 131 339 644 707 764 561 485 430 317 58 4495
1978-79 29 26 134 312 772 915 1058 615 434 351 162 57 4865
1979-80 8 2 19 214 592 631 920 647 575 329 232 125 4294
1980-81 15 25 64 284 485 644 650 583 494 372 229 108 3953
1981-82 23 5 76 355 478 687 780 596 502 472 229 71 4274
1982-83 22 10 99 307 614 715 635 492 435 363 184 81 3957
1983-84 27 2 109 325 463 880 701 546 425 430 269 115 4292
1984-85 9 2 80 377 539 820 893 664 588 327 213 62 4574
1985-86 0 7 124 373 826 982 691 591 417 437 265 43 4756
1986-87 37 0 148 242 510 750 780 550 495 321 173 51 4057
1987-88 22 2 54 214 479 798 801 581 544 380 272 109 4256
1988-89 33 15 91 208 518 705 699 805 594 263 219 77 4227
1989-90 32 27 44 306 486 759 664 641 476 308 251 78 4072
1990-91 10 5 14 336 492 933 802 446 575 420 310 156 4499
1991-92 4 13 25 295 517 685 627 483 387 282 108 35 3461
1992-93 5 9 107 274 556 789 877 692 522 366 135 94 4426
1993-94 37 17 57 231 698 726 630 668 451 316 143 85 4059
1994-95 16 0 23 330 662 696 666 514 510 405 149 95 4066
1995-96 3 15 20 318 392 693 747 671 530 340 294 70 4093
1996-97 16 8 113 340 581 717 737 612 563 413 116 79 4295
1997-98 7 0 42 341 452 734 676 523 498 376 268 72 3989
1998-99 12 4 32 323 475 753 677 592 587 424 312 150 4341
1999-00 38 16 73 298 441 648 774 612 593 323 229 62 4107
2000-01 19 13 75 296 661 759 733 640 517 455 201 140 4509
2001- 22 5 55 347 504 706

2001 Portland, Oregon (PDX)

COOLING DEGREE DAYS (base 65 F) 2001 PORTLAND, OR (PDX)
YEAR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANNUAL
1972 0 0 0 0 27 39 200 221 44 0 0 0 531
1973 0 0 0 0 34 65 178 81 45 0 0 0 403
1974 0 0 0 0 1 60 102 144 102 0 0 0 409
1975 0 0 0 0 12 39 157 57 75 2 0 0 342
1976 0 0 0 0 4 23 89 66 30 4 0 0 216
1977 0 0 0 0 0 42 90 233 10 0 0 0 375
1978 0 0 0 0 3 69 141 112 18 0 0 0 343
1979 0 0 0 0 18 65 183 124 65 7 0 0 462
1980 0 0 0 1 0 2 141 75 35 12 0 0 266
1981 0 0 0 3 4 16 109 232 82 0 0 0 446
1982 0 0 0 0 4 107 103 127 50 0 0 0 391
1983 0 0 0 0 48 23 80 137 12 0 0 0 300
1984 0 0 0 0 10 34 140 144 47 6 0 0 381
1985 0 0 0 0 11 53 291 145 5 0 0 0 505
1986 0 0 0 0 40 87 52 235 50 0 0 0 464
1987 0 0 0 4 37 102 95 177 77 12 0 0 504
1988 0 0 0 0 10 39 147 115 67 8 0 0 386
1989 0 0 0 0 9 62 53 66 60 0 0 0 250
1990 0 0 0 2 3 45 206 193 83 0 0 0 532
1991 0 0 0 0 0 7 164 176 102 2 0 0 451
1992 0 0 0 1 57 114 174 164 31 0 0 0 541
1993 0 0 0 0 21 24 22 132 80 3 0 0 282
1994 0 0 0 0 15 31 210 168 109 0 0 0 533
1995 0 0 0 0 23 63 184 92 91 0 0 0 453
1996 0 0 0 0 1 36 240 181 25 7 0 0 490
1997 0 0 0 0 37 16 134 210 75 0 0 0 472
1998 0 0 0 14 4 30 206 197 96 0 0 0 547
1999 0 0 0 0 9 41 111 149 68 0 0 0 378
2000 0 0 0 0 3 78 113 107 50 0 0 0 351
2001 0 0 0 1 35 28 75 144 64 0 0 0 347

2001 Portland, Oregon (PDX)

SNOWFALL (inches) 2001 PORTLAND, OR (PDX)
YEAR JUL AUG SEP OCT NOV DEC JAN FEB MAR APR MAY JUN TOTAL
1972-73 0.0 0.0 0.0 0.0 0.0 6.1 0.4 T T T 0.0 0.0 6.5
1973-74 0.0 0.0 0.0 0.0 T 0.0 T T T 0.0 T 0.0 T
1974-75 0.0 0.0 0.0 0.0 0.0 T T 0.1 T T T 0.0 0.1
1975-76 0.0 0.0 0.0 0.0 T T T T T T T 0.0 T
1976-77 0.0 0.0 0.0 0.0 0.0 0.0 T 0.0 T 0.0 T 0.0 T
1977-78 0.0 0.0 0.0 0.0 7.6 T 0.0 0.0 0.1 T T 0.0 7.7
1978-79 0.0 0.0 0.0 0.0 3.0 2.4 1.9 1.1 T T 0.0 0.0 8.4
1979-80 0.0 0.0 0.0 0.0 0.0 T 12.4 T T T 0.0 T 12.4
1980-81 0.0 0.0 0.0 0.0 T T 0.0 T T T T T T
1981-82 0.0 0.0 0.0 0.0 0.0 2.0 2.1 T T T 0.0 0.0 4.1
1982-83 0.0 0.0 0.0 T T 0.0 0.0 0.0 T T T 0.0 T
1983-84 0.0 0.0 0.0 0.0 0.0 2.3 0.1 T T 0.0 T 0.0 2.4
1984-85 0.0 0.0 0.0 T 0.0 2.8 T 4.8 T T 0.0 0.0 7.6
1985-86 0.0 0.0 0.0 0.0 3.4 1.6 T 5.8 T T T 0.0 10.8
1986-87 0.0 0.0 0.0 0.0 T 0.1 0.0 T T T T 0.0 0.1
1987-88 0.0 0.0 0.0 0.0 0.0 2.9 0.6 0.0 0.0 T T 0.0 3.5
1988-89 0.0 0.0 0.0 0.0 T T 0.9 0.3 2.0 T 0.0 0.0 3.2
1989-90 0.0 T 0.0 T 0.0 0.0 T 8.3 T 0.0 0.0 0.0 8.3
1990-91 0.0 0.0 0.0 0.0 0.0 1.3 0.6 0.0 T T 0.0 0.0 1.9
1991-92 0.0 0.0 0.0 0.0 T 0.0 0.0 0.0 0.0 T 0.0 0.0 T
1992-93 0.0 0.0 0.0 0.0 T 4.6 2.9 6.6 0.0 T T 0.0 14.1
1993-94 0.0 0.0 0.0 0.0 T T 0.0 2.6 T T 0.0 T 2.6
1994-95 0.0 0.0 0.0 0.0 0.3 1.1 T 3.6 0.4 T 0.0 T 5.4
1995-96 0.0 0.0 0.0 0.0 0.0
1996-97
1997-98
1998-99
1999-00
2000-01
2001-
POR=55 YRS 0.0 T T 0.0 0.4 1.4 3.1 1.1 0.4 T 0.0 T 6.4



User Contributions:

Kimberly
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Nov 8, 2011 @ 5:17 pm
Can you please tell me the weather conditions in Portland, Oregon(specifically) Tigard, Oregon on 01/31/1998. What was the temperature between 5:00am-7:30am? Were the conditions icy that morning? This is of great importance to me. Thank you kindly,
Kimberly

Kimsunkissed@gmail.com

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