2001 PENDLETON, OREGON (PDT)



Pendleton is located in the southeastern part of the Columbia Basin, that low country of northern Oregon and central and eastern Washington which is almost entirely surrounded by mountains. This Basin is bounded on the south by the high country of central Oregon, on the north by the mountains of western Canada, on the west by the Cascade Range and on the east by the Blue Mountains and the north Idaho plateau. The gorge in the Cascades through which the Columbia River reaches the Pacific is the most important break in the barriers surrounding this basin. These physical features have important influences on the general climate of Pendleton and the surrounding territory.

The Weather Service Office at Pendleton Airport is located in rolling country which slopes generally upward toward the Blue Mountains about 15 miles to the east and southeast. The Columbia River approaches the area from the northwest to its junction with the Walla Walla River at an elevation of 35l feet and some 25 miles north of Pendleton, then turns southwestward to be joined a few miles below by the Umatilla River. Both the Walla Walla and Umatilla Rivers have their sources in the Blue Mountains and flow westward to the Columbia. The observation station is at an elevation of nearly 1,500 feet, about 3 miles northwest of downtown Pendleton. The city of Pendleton lies in the shallow east–west valley of the Umatilla River, approximately 400 feet lower than the airport.

Precipitation in the Pendleton area is definitely seasonal in occurrence with an average of only 10 percent of the annual total occurring in the three–month period, July–September. Most precipitation reaching this area accompanies cyclonic storms moving in from the Pacific Ocean. These storms reach their greatest intensity and frequency from October through April. The Cascade Range west of the Columbia Basin reduces the amount of precipitation received from the Pacific cyclonic storms. This influence is felt, particularly, in the desert area of the central part of the Basin. A gradual rise in elevation from the Columbia River to the foothills of the Blue Mountains again results in increased precipitation. This increase supplies sufficient moisture for productive wheat, pea, and stock raising activity in the area surrounding Pendleton.

The lighter summertime precipitation usually accompanies thunderstorms which often move into the area from the south or southwest. On occasion, these storms are quite intense, causing flash flooding with resultant heavy property damage and even loss of life.

Seasonal temperature extremes are usually quite moderate for the latitude. The last occurrence in spring of temperatures as low as 32 degrees is mid–April, and the average last occurrence in the fall of 32 degrees is late October. At the city station, where cool air settles in the valley on still nights, temperatures of 32 degrees have been recorded later in the spring and earlier in the fall. Under usual atmospheric conditions, air from the Pacific, with moderate temperature characteristics, moves across the Cascades or through the Columbia Gorge resulting in mild temperatures in the Pendleton area. When this flow of air from the west is impeded by slow–moving high pressure systems over the interior of the continent, temperature conditions sometimes become rather severe, hot in summer and cold in winter. During the summer or early fall, if a stagnant high predominates to the north or east of Pendleton, the hot, dry conditions may prove detrimental to crops during late May and June, and cause fire danger in the forest and grassland areas during late summer and early fall. During winter, coldest temperatures occur when air from a cold high pressure system in central Canada moves southwestward across the Rockies and flows down into the Columbia Basin. Under this condition the heavy cold air sometimes remains at low levels in the Basin for several days while warmer air from the Pacific flows above it, causing comparatively mild temperatures at higher elevations. Extreme winter temperatures are not particularly common in the Pendleton area. Below zero readings are recorded in approximately 60 percent of winters. Maximum temperatures usually reach 100 degrees or slightly higher on a few days during the summer.

NORMALS, MEANS, AND EXTREMES

PENDLETON, OR (PDT)

LATITUDE:    LONGITUDE:     ELEVATION (FT):    TIME ZONE:    WBAN: 24155

45 41′ 54″ N  118 50′ 03″ W  GRND:  1504  BARO: &#x 0A0;1504  PACIFIC (UTC + 8)

2001 Pendleton, Oregon (PDT)

ELEMENT POR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC YEAR
TEMPERATURE F NORMAL DAILY MAXIMUM 30 39.7 46.9 54.2 61.3 70.0 79.5 87.8 86.2 76.3 63.7 48.9 40.5 62.9
MEAN DAILY MAXIMUM 54 39.5 46.3 53.7 61.5 70.1 78.5 87.7 85.9 76.9 63.4 48.9 40.9 62.8
HIGHEST DAILY MAXIMUM 66 70 75 79 91 100 108 110 113 102 92 80 67 113
YEAR OF OCCURRENCE 1995 1996 1964 1977 1986 1961 1939 1961 1955 1980 1999 1980 AUG 1961
MEAN OF EXTREME MAXS. 54 58.4 62.2 68.1 77.7 88.0 94.6 101.4 99.7 92.4 79.9 65.9 59.3 79.0
NORMAL DAILY MINIMUM 30 27.2 31.6 35.4 39.4 45.8 52.9 58.0 57.7 49.9 41.0 34.1 27.9 41.7
MEAN DAILY MINIMUM 54 26.7 31.0 34.8 39.5 46.0 52.4 57.9 57.3 50.2 41.0 33.7 28.5 41.6
LOWEST DAILY MINIMUM 66 -22 -18 1 18 25 35 42 40 30 11 -12 -19 -22
YEAR OF OCCURRENCE 1957 1950 1993 1936 1954 1991 1971 1980 2000 1935 1985 1983 JAN 1957
MEAN OF EXTREME MINS. 54 7.3 15.0 23.8 30.1 35.1 42.4 47.9 47.4 38.7 28.9 20.8 11.8 29.1
NORMAL DRY BULB 30 33.5 39.2 44.8 50.3 57.9 66.2 72.9 72.0 63.1 52.4 41.5 34.3 52.3
MEAN DRY BULB 54 33.0 38.6 44.2 50.5 58.0 65.5 72.8 71.6 63.6 52.3 41.3 34.6 52.2
MEAN WET BULB 18 31.9 34.2 39.7 44.2 49.3 53.6 56.9 56.3 51.7 44.3 37.6 28.8 44.0
MEAN DEW POINT 18 28.1 29.5 33.3 36.4 40.9 43.3 44.0 43.3 40.7 36.3 33.1 25.6 36.2
NORMAL NO. DAYS WITH:
MAXIMUM 90 30 0.0 0.0 0.0 * 0.8 5.3 14.4 11.7 2.6 0.1 0.0 0.0 34.9
MAXIMUM 32 30 8.6 2.7 0.2 0.0 0.0 0.0 0.0 0.0 0.0 0.0 2.1 8.1 21.7
MINIMUM 32 30 20.1 14.5 8.8 3.2 0.1 0.0 0.0 0.0 0.2 3.1 10.8 19.7 80.5
MINIMUM 0 30 1.4 0.4 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.1 1.2 3.1
H/C NORMAL HEATING DEG. DAYS 30 977 722 626 441 226 71 15 23 145 391 705 952 5294
NORMAL COOLING DEG. DAYS 30 0 0 0 0 6 107 260 240 88 0 0 0 701
RH NORMAL (PERCENT) 30 77 73 63 58 52 46 36 38 47 59 74 78 58
HOUR 04 LST 30 79 78 73 71 68 63 53 53 61 70 78 80 69
HOUR 10 LST 30 77 71 60 52 47 41 33 36 42 54 72 78 55
HOUR 16 LST 30 73 63 49 42 37 31 23 26 32 44 68 76 47
HOUR 22 LST 30 79 76 68 62 56 49 37 40 51 64 77 80 62
S PERCENT POSSIBLE SUNSHINE
W/O MEAN NO. DAYS WITH:
HEAVY FOG(VISBY 1/4 MI) 64 7.4 4.9 1.9 0.3 0.2 0.1 0.0 0.0 0.2 1.0 6.1 8.4 30.5
THUNDERSTORMS 64 0.0 0.0 0.2 0.9 1.8 2.0 2.0 2.1 1.2 0.3 0.1 0.0 10.6
CLOUDINESS MEAN:
SUNRISE-SUNSET (OKTAS) 1 6.4 3.2
MIDNIGHT-MIDNIGHT (OKTAS) 1 3.2
MEAN NO. DAYS WITH:
CLEAR 1 1.0 3.0 4.0 5.0 7.0
PARTLY CLOUDY 1 3.0 2.0 5.0 3.0
CLOUDY 1 3.0 2.0 9.0 10.0 3.0
PR MEAN STATION PRESSURE(IN) 28 28.52 28.47 28.40 28.42 28.40 28.39 28.40 28.39 28.44 28.49 28.47 28.54 28.44
MEAN SEA-LEVEL PRES. (IN) 18 30.13 30.10 30.02 30.01 29.96 29.96 29.96 29.95 29.98 30.06 30.09 30.19 30.03
WINDS MEAN SPEED (MPH) 37 7.2 7.9 8.8 9.5 9.2 9.1 8.8 8.4 8.0 7.5 7.7 7.5 8.3
PREVAIL. DIR (TENS OF DEGS) 23 14 14 26 26 26 26 26 27 14 14 15 16 26
MAXIMUM 2-MINUTE:
SPEED (MPH) 6 47 49 55 48 43 41 40 43 45 44 41 54 55
DIR. (TENS OF DEGS) 24 15 25 25 24 25 27 23 27 24 26 22 25
YEAR OF OCCURRENCE 2000 1999 1997 1997 1996 1998 2000 1997 1999 2001 2000 1998 MAR 1997
MAXIMUM 5-SECOND:
SPEED (MPH) 6 56 58 63 55 51 51 47 59 53 52 48 66 66
DIR. (TENS OF DEGS) 23 16 25 21 24 25 27 23 27 24 26 22 22
YEAR OF OCCURRENCE 2000 1999 1997 1998 1996 1998 2000 1997 1999 2001 2000 1998 DEC 1998
PRECIPITATION NORMAL (IN) 30 1.51 1.14 1.16 1.04 0.99 0.64 0.35 0.53 0.59 0.86 1.58 1.63 12.02
MAXIMUM MONTHLY (IN) 66 3.92 3.03 2.82 2.78 3.18 2.70 1.45 2.58 2.34 2.79 3.76 4.68 4.68
YEAR OF OCCURRENCE 1970 1940 1983 1978 1991 1947 1993 1977 1941 1947 1973 1973 DEC 1973
MINIMUM MONTHLY (IN) 66 0.21 0.07 0.24 0.01 0.03 0.03 T 0.00 T T 0.04 0.21 0.00
YEAR OF OCCURRENCE 1949 1964 1941 1956 1964 1986 1967 1969 1993 1987 1939 1989 AUG 1969
MAXIMUM IN 24 HOURS (IN) 66 1.29 1.41 1.33 1.24 1.52 1.49 1.19 2.19 1.23 1.88 1.35 1.25 2.19
YEAR OF OCCURRENCE 1956 1994 1983 1990 1972 1947 1948 1993 1981 1982 1971 1978 AUG 1993
NORMAL NO. DAYS WITH:
PRECIPITATION 0.01 30 12.0 10.9 10.6 8.7 7.2 5.8 2.9 3.6 4.7 6.1 11.7 12.2 96.4
PRECIPITATION 1.00 30 * 0.0 * 0.1 * 0.0 0.0 * * * * * 0.1
SNOWFALL NORMAL (IN) 30 6.1 2.1 1.0 0.1 T 0.0 0.0 0.0 0.0 0.2 2.2 5.2 16.9
MAXIMUM MONTHLY (IN) 64 41.6 16.8 4.9 2.2 T T T 0.0 0.0 3.2 14.9 26.6 41.6
YEAR OF OCCURRENCE 1950 1994 1971 1975 1993 1994 1993 1973 1985 1983 JAN 1950
MAXIMUM IN 24 HOURS (IN) 64 13.3 16.1 4.0 2.2 T T T 0.0 0.0 3.2 8.0 9.9 16.1
YEAR OF OCCURRENCE 1950 1994 1970 1975 1993 1994 1993 1973 1977 1948 FEB 1994
MAXIMUM SNOW DEPTH (IN) 52 16 12 6 0 0 0 0 0 0 2 8 11 16
YEAR OF OCCURRENCE 1957 1994 1993 1971 1978 1985 JAN 1957
NORMAL NO. DAYS WITH:
SNOWFALL 1.0 30 2.2 0.6 0.4 0.1 0.0 0.0 0.0 0.0 0.0 0.1 0.6 1.9 5.9

2001 Pendleton, Oregon (PDT)

PRECIPITATION (inches) 2001 PENDLETON, OR (PDT)
YEAR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANNUAL
1972 0.96 1.08 1.47 0.68 1.97 0.80 0.58 0.36 0.16 0.58 0.70 2.31 11.65
1973 0.50 1.09 0.43 0.27 0.67 0.15 0.01 0.08 1.34 1.71 3.76 4.68 14.69
1974 0.79 1.57 0.81 2.13 0.26 0.19 0.90 T T 0.29 1.00 1.59 9.53
1975 3.53 1.30 0.65 0.97 0.30 0.28 0.73 0.67 0.00 1.80 0.84 1.98 13.05
1976 1.77 1.00 1.65 1.09 0.92 0.33 0.16 1.77 0.18 0.54 0.19 0.44 10.04
1977 0.48 0.64 1.51 0.18 1.87 0.37 0.06 2.58 1.17 0.51 2.00 2.42 13.79
1978 2.82 1.60 1.03 2.78 0.63 0.76 0.77 2.21 0.92 T 2.37 1.86 17.75
1979 1.43 1.72 1.18 1.17 0.39 0.21 0.09 1.40 0.30 1.68 1.83 0.62 12.02
1980 2.48 1.39 1.60 0.59 2.14 1.12 0.77 0.03 0.59 1.22 0.84 1.20 13.97
1981 0.89 1.35 1.43 1.20 1.59 1.53 0.94 0.03 1.31 0.86 1.91 2.31 15.35
1982 1.54 0.77 1.22 0.84 0.31 0.63 0.51 0.24 1.47 2.67 0.34 2.20 12.74
1983 0.86 1.57 2.82 0.70 0.73 1.44 0.52 0.56 0.46 0.84 1.67 3.42 15.59
1984 0.53 1.74 1.83 1.70 1.02 1.13 0.06 0.44 0.39 1.02 2.14 0.92 12.92
1985 0.44 1.33 1.13 0.37 0.44 0.69 0.34 0.26 2.10 0.89 2.11 1.27 11.37
1986 1.66 2.58 1.13 0.43 1.18 0.03 0.48 0.02 1.28 0.80 2.12 0.82 12.53
1987 1.48 0.64 1.39 0.47 0.85 0.38 0.34 0.05 0.03 T 0.76 1.23 7.62
1988 1.86 0.12 0.95 2.47 1.56 0.31 0.01 T 0.31 0.10 2.16 0.37 10.22
1989 1.86 1.36 1.72 1.57 1.47 0.57 0.09 1.25 0.12 0.84 1.27 0.21 12.33
1990 0.77 0.28 1.14 1.54 1.83 0.58 0.18 0.62 T 0.78 0.87 0.84 9.43
1991 0.98 0.57 1.00 0.71 3.18 2.14 0.24 0.42 T 0.92 2.68 0.67 13.51
1992 0.41 1.04 0.26 1.21 0.07 0.94 0.70 0.43 0.42 1.32 1.15 0.73 8.68
1993 1.79 0.80 1.49 1.85 1.51 0.71 1.45 2.19 T 0.22 0.93 0.92 13.86
1994 1.57 1.71 0.56 0.45 2.55 0.77 0.38 T 0.36 1.28 1.98 0.85 12.46
1995 2.53 1.07 1.93 2.28 0.97 2.30 0.24 0.29 0.55 1.21 2.18 1.73 17.28
1996 1.88 1.80 1.00 1.08 2.00 0.47 0.06 0.05 0.61 1.22 1.96 2.32 14.45
1997 1.84 0.39 1.16 1.56 0.33 0.76 0.66 0.07 0.77 1.43 1.64 1.05 11.66
1998 2.61 1.19 1.01 1.28 1.53 0.76 0.68 T 1.11 0.60 2.31 1.37 14.45
1999 0.81 1.22 0.74 0.50 1.27 0.51 T 0.54 0.01 1.51 1.23 1.01 9.35
2000 1.99 2.98 2.42 0.69 1.60 0.72 0.07 T 2.01 2.06 1.22 0.57 16.33
2001 0.95 0.62 1.31 1.89 0.45 1.12 0.52 0.08 0.09 1.54 1.15 0.70 10.42
POR=102 YRS 1.57 1.31 1.24 1.08 1.15 0.96 0.31 0.40 0.62 1.04 1.51 1.50 12.69

2001 Pendleton, Oregon (PDT)

AVERAGE TEMPERATURE (F) 2001 PENDLETON, OR (PDT)
YEAR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANNUAL
1972 34.0 37.4 47.8 47.6 60.9 68.3 74.7 76.2 61.1 51.1 42.6 27.1 52.4
1973 31.3 38.4 45.8 50.3 61.3 66.9 75.3 71.7 64.0 52.8 42.6 41.5 53.5
1974 30.4 43.8 46.4 51.7 57.3 71.1 73.3 75.5 67.5 54.8 44.8 40.6 54.8
1975 37.1 39.0 45.2 47.5 59.3 65.8 78.4 70.1 67.0 54.3 42.3 40.5 53.9
1976 39.2 37.9 42.8 50.2 58.8 63.7 73.4 67.7 67.3 53.1 42.7 35.9 52.7
1977 26.3 41.5 44.2 55.3 55.1 69.1 70.3 74.9 58.5 50.0 38.3 34.8 51.5
1978 32.2 39.3 45.7 48.0 54.4 66.3 72.2 69.4 60.5 51.7 33.5 29.5 50.2
1979 15.3 37.7 46.0 50.4 59.5 66.6 72.8 70.6 65.5 54.3 34.7 38.2 51.0
1980 25.6 36.1 41.3 51.9 56.4 60.4 72.1 66.9 63.3 51.3 42.0 39.2 50.5
1981 36.2 38.9 45.7 50.4 56.0 61.6 69.2 74.3 63.8 50.6 44.2 37.2 52.3
1982 35.0 38.1 43.5 47.6 56.8 67.6 71.1 71.5 60.7 50.7 37.3 35.7 51.3
1983 40.8 43.8 47.8 49.0 58.9 62.7 68.4 72.7 58.9 52.5 45.9 23.2 52.1
1984 34.6 39.7 46.8 48.2 54.7 62.1 72.9 72.2 60.4 49.1 41.8 30.4 51.1
1985 26.3 33.5 43.2 53.1 58.5 65.6 77.4 68.1 57.0 50.3 26.5 19.5 48.3
1986 35.9 39.0 48.8 50.0 58.6 70.0 67.6 75.8 58.9 54.0 42.2 31.5 52.7
1987 30.4 39.1 46.4 53.9 59.7 67.2 68.9 70.6 66.2 54.1 42.6 32.7 52.7
1988 32.4 41.1 44.1 51.9 56.8 63.9 72.0 70.0 63.4 58.4 44.3 33.9 52.7
1989 38.3 25.1 42.5 52.9 55.9 65.9 70.3 68.8 63.6 51.8 44.6 33.2 51.1
1990 39.6 37.9 45.7 54.8 56.4 64.7 75.2 72.2 68.2 51.3 45.4 25.8 53.1
1991 31.2 44.7 42.6 49.6 53.9 59.6 71.5 73.3 64.9 51.6 41.2 36.9 51.8
1992 38.7 42.4 47.7 52.8 62.4 70.4 71.9 72.6 61.9 54.2 39.8 32.0 53.9
1993 25.1 28.2 41.9 50.3 61.8 62.9 65.4 68.0 64.3 54.6 34.6 35.6 49.4
1994 41.0 34.9 46.7 54.4 60.1 64.4 75.3 71.7 67.2 51.6 40.4 35.3 53.6
1995 34.9 41.7 45.3 49.0 57.7 62.1 72.0 67.4 66.0 50.2 46.1 34.5 52.2
1996 34.4 35.7 43.3 52.0 54.5 64.0 74.7 72.1 61.0 51.1 40.3 35.4 51.5
1997 32.6 38.6 45.4 48.6 59.8 63.1 70.4 73.1 64.9 51.4 42.7 34.9 52.1
1998 37.9 42.9 45.9 50.3 56.2 65.4 77.4 74.6 67.8 50.9 45.5 36.2 54.3
1999 41.0 42.3 43.4 47.3 54.1 63.7 70.0 72.5 62.5 50.8 46.0 38.1 52.6
2000 35.5 39.2 44.1 54.0 58.3 65.9 71.6 70.7 61.6 49.7 35.1 31.1 51.4
2001 32.7 35.5 44.4 47.3 58.7 62.1 70.5 73.2 66.2 51.2 42.2 36.6 51.7
POR=96 YRS 32.8 38.0 44.9 51.3 58.4 65.5 73.1 71.4 63.2 52.5 41.4 35.1 52.3

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 Pendleton, Oregon (PDT)

HEATING DEGREE DAYS (base 65 F) 2001 PENDLETON, OR (PDT)
YEAR JUL AUG SEP OCT NOV DEC JAN FEB MAR APR MAY JUN TOTAL
1972-73 5 4 165 422 663 1170 1036 738 588 434 169 73 5467
1973-74 1 16 97 372 666 721 1064 589 573 391 241 29 4760
1974-75 8 0 39 313 600 750 857 721 609 517 194 57 4665
1975-76 0 12 43 332 673 751 791 782 679 436 206 89 4794
1976-77 4 42 31 363 660 896 1192 653 639 299 301 26 5106
1977-78 20 35 200 461 792 927 1011 714 593 504 322 46 5625
1978-79 7 41 146 403 936 1094 1533 757 582 432 184 62 6177
1979-80 12 0 43 326 902 823 1210 829 728 388 267 141 5669
1980-81 4 33 88 438 681 794 886 724 593 435 275 126 5077
1981-82 20 1 128 440 617 855 919 747 662 515 256 72 5232
1982-83 22 7 171 435 825 901 741 588 528 470 242 95 5025
1983-84 42 1 180 381 569 1292 935 729 558 496 316 134 5633
1984-85 4 0 182 490 692 1065 1196 876 665 351 224 65 5810
1985-86 4 22 242 452 1149 1402 898 722 497 446 277 25 6136
1986-87 33 0 213 335 675 1031 1065 717 571 332 201 71 5244
1987-88 25 12 65 334 668 995 1004 689 637 387 264 126 5206
1988-89 22 4 120 208 616 957 821 1113 691 354 279 42 5227
1989-90 11 17 76 403 607 978 781 752 591 299 262 89 4866
1990-91 9 13 11 419 583 1211 1039 564 689 454 338 162 5492
1991-92 4 2 52 418 707 865 810 649 527 362 127 36 4559
1992-93 11 28 129 333 752 1015 1231 1025 709 432 153 98 5916
1993-94 27 35 114 318 908 903 736 838 559 321 174 83 5016
1994-95 15 0 30 406 731 915 928 644 602 473 237 126 5107
1995-96 1 26 51 452 560 941 938 840 664 387 321 64 5245
1996-97 8 4 153 423 733 909 998 733 599 488 185 84 5317
1997-98 13 0 73 415 662 927 832 611 585 442 273 37 4870
1998-99 0 3 56 429 578 887 738 628 662 522 336 108 4947
1999-00 17 20 117 433 565 830 905 740 640 324 219 57 4867
2000-01 7 12 137 468 892 1046 995 819 631 523 238 121 5889
2001- 14 5 48 419 676 874

2001 Pendleton, Oregon (PDT)

COOLING DEGREE DAYS (base 65 F) 2001 PENDLETON, OR (PDT)
YEAR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANNUAL
1972 0 0 0 0 50 134 314 358 55 0 0 0 911
1973 0 0 0 0 63 137 327 232 72 0 0 0 831
1974 0 0 0 0 9 219 272 332 122 4 0 0 958
1975 0 0 0 0 27 88 423 179 109 8 0 0 834
1976 0 0 0 0 20 53 270 129 103 3 0 0 578
1977 0 0 0 16 3 152 190 348 16 0 0 0 725
1978 0 0 0 0 1 93 236 182 16 0 0 0 528
1979 0 0 0 0 21 114 261 186 65 3 0 0 650
1980 0 0 0 2 5 13 232 101 44 20 0 0 417
1981 0 0 0 4 2 28 155 297 101 0 0 0 587
1982 0 0 0 0 7 158 219 215 47 0 0 0 646
1983 0 0 0 0 60 32 155 246 6 0 0 0 499
1984 0 0 0 0 7 55 256 231 51 3 0 0 603
1985 0 0 0 0 28 91 394 127 7 0 0 0 647
1986 0 0 0 2 88 184 121 341 35 1 0 0 772
1987 0 0 0 8 41 145 152 194 108 4 0 0 652
1988 0 0 0 0 16 98 246 164 78 9 0 0 611
1989 0 0 0 0 5 76 182 143 41 0 0 0 447
1990 0 0 0 0 4 92 330 245 114 3 0 0 788
1991 0 0 0 0 0 8 214 267 56 9 0 0 554
1992 0 0 0 1 52 204 229 275 45 4 0 0 810
1993 0 0 0 0 59 42 47 136 99 4 0 0 387
1994 0 0 0 8 29 72 341 214 103 0 0 0 767
1995 0 0 0 0 17 44 230 108 89 0 0 0 488
1996 0 0 0 0 0 42 312 230 39 0 0 0 623
1997 0 0 0 0 31 34 191 258 79 5 0 0 598
1998 0 0 0 6 5 56 390 309 144 0 0 0 910
1999 0 0 0 0 7 78 180 260 50 0 5 0 580
2000 0 0 0 0 17 89 215 196 40 0 0 0 557
2001 0 0 0 0 48 43 193 265 93 0 0 0 642

2001 Pendleton, Oregon (PDT)

SNOWFALL (inches) 2001 PENDLETON, OR (PDT)
YEAR JUL AUG SEP OCT NOV DEC JAN FEB MAR APR MAY JUN TOTAL
1972-73 0.0 0.0 0.0 T T 12.6 2.2 5.9 T 0.1 0.0 0.0 20.8
1973-74 0.0 0.0 0.0 3.2 9.1 5.3 2.6 0.5 T T 0.0 0.0 20.7
1974-75 0.0 0.0 0.0 0.0 T T 16.6 3.3 T 2.2 T 0.0 22.1
1975-76 0.0 0.0 0.0 0.0 5.2 3.0 0.3 0.3 0.1 0.0 0.0 0.0 8.9
1976-77 0.0 0.0 0.0 0.0 0.0 1.0 3.1 0.5 0.4 0.0 0.0 0.0 5.0
1977-78 0.0 0.0 0.0 0.0 8.5 11.5 6.1 T 3.9 0.0 T 0.0 30.0
1978-79 0.0 0.0 0.0 0.0 9.0 7.4 14.7 2.2 T 0.0 0.0 0.0 33.3
1979-80 0.0 0.0 0.0 0.0 4.3 T 16.6 0.9 3.9 0.0 0.0 0.0 25.7
1980-81 0.0 0.0 0.0 0.0 2.0 2.7 3.6 1.2 0.0 0.0 0.0 0.0 9.5
1981-82 0.0 0.0 0.0 0.0 0.6 5.1 5.7 1.5 1.9 T 0.0 0.0 14.8
1982-83 0.0 0.0 0.0 0.0 T 1.6 0.2 0.9 0.0 0.0 0.0 0.0 2.7
1983-84 0.0 0.0 0.0 0.0 T 26.6 1.0 1.2 T T 0.0 0.0 28.8
1984-85 0.0 0.0 0.0 0.0 T 6.2 0.8 12.7 0.6 T 0.0 0.0 20.3
1985-86 0.0 0.0 0.0 0.0 14.9 9.1 T 7.6 0.0 0.0 T 0.0 31.6
1986-87 0.0 0.0 0.0 0.0 1.2 6.8 5.8 0.0 T 0.0 0.0 0.0 13.8
1987-88 0.0 0.0 0.0 0.0 0.3 2.3 10.6 0.0 1.5 0.0 0.0 0.0 14.7
1988-89 0.0 0.0 0.0 0.0 T T 4.3 4.9 4.0 0.0 T 0.0 13.2
1989-90 0.0 0.0 0.0 0.0 0.0 1.0 T 2.0 1.3 0.0 0.0 0.0 4.3
1990-91 0.0 0.0 0.0 0.0 T 6.4 1.6 0.0 0.6 T 0.0 0.0 8.6
1991-92 0.0 0.0 0.0 2.3 1.0 T 0.8 T 0.0 0.0 0.0 0.0 4.1
1992-93 0.0 0.0 0.0 0.0 0.2 7.6 25.1 14.8 1.8 T T 0.0 49.5
1993-94 T 0.0 0.0 0.0 0.7 0.4 T 16.8 0.2 0.0 0.0 T 18.1
1994-95 0.0 0.0 0.0 0.0 0.6 3.8 2.0 7.2 T 0.0 0.0 0.0 13.6
1995-96 0.0 0.0 0.0 0.0
1996-97 10.1 3.2 T
1997-98 4.2 0.0
1998-99 0.0 0.0 0.8 0.0 2.4 T T T 0.0
1999-00 0.0 0.0 0.0 0.0 0.0 0.5 5.7 4.5 1.0 0.0 T 0.0 11.7
2000-01 0.0 0.0 0.0 0.0 0.7 2.5 3.1 0.5 T T T T 6.8
2001- 0.0 0.0 0.0 0.0 T 3.0
POR=63 YRS T 0.0 0.0 0.1 1.7 3.8 6.7 3.6 0.9 0.1 T T 16.9



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