2001 RALEIGH, NORTH CAROLINA (RDU)



The Raleigh–Durham Airport is located in the zone of transition between the Coastal Plain and the Piedmont Plateau. The surrounding terrain is rolling, with an average elevation of around 400 feet, the range over a 10–mile radius is roughly between 200 and 550 feet. Being centrally located between the mountains on the west and the coast on the south and east, the Raleigh–Durham area enjoys a favorable climate. The mountains form a partial barrier to cold air masses moving eastward from the interior of the nation. As a result, there are few days in the heart of the winter season when the temperature falls below 20 degrees. Tropical air is present over the eastern and central sections of North Carolina during much of the summer season, bringing warm temperatures and rather high humidities to the Raleigh–Durham area. Afternoon temperatures reach 90 degrees or higher on about one–fourth of the days in the middle of summer, but reach 100 degrees less than once per year. Even in the hottest weather, early morning temperatures almost always drop into the lower 70s.

Rainfall is well distributed throughout the year as a whole. July and August have the greatest amount of rainfall, and October and November the least. There are times in spring and summer when soil moisture is scanty. This usually results from too many days between rains rather than from a shortage of total rainfall, but occasionally the accumulated total during the growing season falls short of plant needs. Most summer rain is produced by thunderstorms, which may occasionally be accompanied by strong winds, intense rains, and hail. The Raleigh–Durham area is far enough from the coast so that the bad weather effects of coastal storms are reduced. While snow and sleet usually occur each year, excessive accumulations of snow are rare.

From September 1887 to December 1950, the office was located in the downtown areas of Raleigh. The various buildings occupied were within an area of three blocks. All thermometers were exposed on the roof, and this, plus the smoke over the city, had an effect on the temperature record of that period. Lowest temperatures at the city office were frequently from 2 to 5 degrees higher than those recorded in surrounding rural areas. Maximum temperatures in the city were generally a degree or two lower. These observations are supported by a period of simultaneous record from the Municipal Airport and the city office location between 1937 and 1940.

From September 1946 to May 1954, simultaneous records were kept at a surface location on the North Carolina State College campus in Raleigh, and at the Raleigh–Durham Airport 10 l/2 air miles to the northwest.

Based on the 1951–1980 period, the average first occurrence of 32 degrees Fahrenheit in the fall is October 27 and the average last occurrence in the spring is April 11.

NORMALS, MEANS, AND EXTREMES

RALEIGH, NC (RDU)

LATITUDE:    LONGITUDE:     ELEVATION (FT):    TIME ZONE:    WBAN: 13722

35 52′ 14″ N  78 47′ 11″ W  GRND:  427  BARO: � A0;430  EASTERN (UTC + 5)

2001 Raleigh, North Carolina (RDU)

ELEMENT POR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC YEAR
TEMPERATURE F NORMAL DAILY MAXIMUM 30 48.9 52.6 62.1 71.7 78.6 85.0 88.0 86.8 81.1 71.6 62.6 52.7 70.1
MEAN DAILY MAXIMUM 54 50.5 53.9 61.7 71.9 79.0 85.6 88.7 87.4 81.3 71.9 62.4 53.1 70.6
HIGHEST DAILY MAXIMUM 57 79 84 92 95 97 104 105 105 104 98 88 80 105
YEAR OF OCCURRENCE 1952 1977 1945 1980 1953 1954 1952 1988 1954 1954 1950 1998 AUG 1988
MEAN OF EXTREME MAXS. 54 70.7 73.6 81.0 87.5 90.4 95.6 96.5 95.5 91.8 85.3 78.5 72.1 84.9
NORMAL DAILY MINIMUM 30 28.8 31.3 38.7 46.2 55.3 63.6 68.1 67.5 61.1 48.4 39.7 32.4 48.4
MEAN DAILY MINIMUM 54 29.8 31.8 38.1 46.6 55.4 63.6 68.0 66.8 60.4 48.1 38.8 32.0 48.3
LOWEST DAILY MINIMUM 57 -9 0 11 23 31 38 48 46 37 19 11 4 -9
YEAR OF OCCURRENCE 1985 1996 1980 1985 1977 1977 1975 1965 1983 1962 1970 1983 JAN 1985
MEAN OF EXTREME MINS. 54 11.7 15.1 22.3 30.4 40.5 50.8 57.1 55.5 45.5 31.5 22.5 14.7 33.1
NORMAL DRY BULB 30 38.9 42.0 50.4 59.0 67.0 74.3 78.1 77.1 71.1 60.1 51.2 42.6 59.3
MEAN DRY BULB 54 40.1 43.0 50.0 59.2 67.2 74.5 78.5 77.1 71.0 60.0 50.6 42.5 59.5
MEAN WET BULB 18 36.3 39.4 44.4 52.1 60.6 68.2 68.1 66.7 61.2 54.9 46.4 36.3 52.9
MEAN DEW POINT 18 28.9 31.5 36.3 45.0 52.5 64.6 65.2 64.0 58.1 50.3 40.3 29.6 47.2
NORMAL NO. DAYS WITH:
MAXIMUM 90 30 0.0 0.0 * 0.6 1.5 6.9 11.9 10.1 3.0 0.2 0.0 0.0 34.2
MAXIMUM 32 30 2.4 0.6 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 * 0.8 3.9
MINIMUM 32 30 20.8 17.4 9.5 2.3 0.1 0.0 0.0 0.0 0.0 1.6 9.1 17.8 78.6
MINIMUM 0 30 0.2 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.2
H/C NORMAL HEATING DEG. DAYS 30 809 644 458 193 47 0 0 0 9 189 414 694 3457
NORMAL COOLING DEG. DAYS 30 0 0 6 13 109 279 406 375 192 37 0 0 1417
RH NORMAL (PERCENT) 30 66 64 63 62 71 74 76 78 77 73 69 68 70
HOUR 01 LST 30 73 71 71 73 84 87 88 90 88 85 78 75 80
HOUR 07 LST 30 79 78 80 80 85 87 89 92 92 89 84 80 85
HOUR 13 LST 30 54 52 49 45 53 56 58 59 58 52 52 55 54
HOUR 19 LST 30 63 59 56 53 65 67 70 74 76 74 67 66 66
S PERCENT POSSIBLE SUNSHINE 42 52 56 60 63 59 60 60 58 58 60 57 53 58
W/O MEAN NO. DAYS WITH:
HEAVY FOG(VISBY 1/4 MI) 52 3.5 2.8 2.1 1.4 2.3 1.9 2.6 3.2 3.3 3.3 3.2 3.4 33.0
THUNDERSTORMS 57 0.4 0.9 2.1 3.5 6.2 7.2 10.4 7.7 3.3 1.4 0.8 0.3 44.2
CLOUDINESS MEAN:
SUNRISE-SUNSET (OKTAS) 47 5.0 4.7 4.7 4.4 4.7 4.6 4.8 4.7 4.7 3.9 4.2 4.6 4.6
MIDNIGHT-MIDNIGHT (OKTAS) 32 4.7 4.4 4.3 4.1 4.6 4.4 4.7 4.6 4.2 3.7 4.0 4.3 4.3
MEAN NO. DAYS WITH:
CLEAR 48 9.0 8.7 9.4 9.6 8.2 7.6 7.2 7.3 9.5 12.8 11.3 10.0 110.6
PARTLY CLOUDY 48 6.7 6.1 7.3 9.1 10.0 11.8 12.2 12.3 9.1 7.1 7.3 7.0 106.0
CLOUDY 48 15.2 13.5 14.3 11.3 12.8 10.7 11.6 11.3 11.4 11.1 11.4 14.0 148.6
PR MEAN STATION PRESSURE(IN) 29 29.64 29.61 29.57 29.54 29.54 29.55 29.57 29.60 29.62 29.65 29.66 29.67 29.60
MEAN SEA-LEVEL PRES. (IN) 18 30.13 30.12 30.05 30.00 30.01 30.00 30.04 30.04 30.07 30.12 30.15 30.17 30.08
WINDS MEAN SPEED (MPH) 47 8.1 8.4 9.1 8.7 7.5 6.9 6.6 6.2 6.6 6.5 7.0 7.4 7.4
PREVAIL. DIR (TENS OF DEGS) 32 23 23 22 22 23 22 23 22 04 04 23 23 23
MAXIMUM 2-MINUTE:
SPEED (MPH) 5 38 45 46 33 33 30 37 36 40 23 32 40 46
DIR. (TENS OF DEGS) 28 23 24 23 27 16 06 24 03 22 23 22 24
YEAR OF OCCURRENCE 1999 1997 1999 2000 2001 2000 1997 2001 1999 2001 1999 2000 MAR 1999
MAXIMUM 5-SECOND:
SPEED (MPH) 5 70 64 61 45 44 43 52 43 61 32 38 49 70
DIR. (TENS OF DEGS) 24 23 23 30 28 22 05 03 25 25 23 20 24
YEAR OF OCCURRENCE 1999 1997 1999 2000 2001 1998 1997 1998 1998 2001 1999 2000 JAN 1999
PRECIPITATION NORMAL (IN) 30 3.48 3.69 3.77 2.59 3.92 3.68 4.01 4.02 3.19 2.86 2.98 3.24 41.43
MAXIMUM MONTHLY (IN) 57 7.52 6.42 7.78 6.10 7.67 9.38 10.27 12.18 21.79 9.10 8.22 6.65 21.79
YEAR OF OCCURRENCE 1954 1989 1983 1978 1974 1973 1991 1986 1999 1995 1948 1983 SEP 1999
MINIMUM MONTHLY (IN) 57 0.87 0.69 1.03 0.23 0.58 0.33 0.80 0.81 0.23 0.44 0.50 0.25 0.23
YEAR OF OCCURRENCE 1981 1991 1985 1976 1999 1993 1953 1950 1985 2000 2001 1965 SEP 1985
MAXIMUM IN 24 HOURS (IN) 57 3.11 3.22 3.70 4.04 4.40 3.44 4.27 5.20 5.41 4.24 4.70 3.18 5.41
YEAR OF OCCURRENCE 1984 1973 1983 1978 1957 1967 1997 5020 1999 1995 1963 1958 SEP 1999
NORMAL NO. DAYS WITH:
PRECIPITATION 0.01 30 9.8 9.4 10.1 8.7 10.5 9.1 10.7 9.8 7.0 6.6 7.8 9.3 108.8
PRECIPITATION 1.00 30 1.0 1.0 0.7 0.4 0.9 1.1 0.9 1.3 0.9 0.9 0.6 0.6 10.3
SNOWFALL NORMAL (IN) 30 2.4 3.2 1.5 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.2 0.5 7.9
MAXIMUM MONTHLY (IN) 57 25.8 17.2 14.0 1.8 T T T 0.0 0.0 0.0 2.6 10.6 25.8
YEAR OF OCCURRENCE 2000 1979 1960 1983 1996 1996 1993 1975 1958 JAN 2000
MAXIMUM IN 24 HOURS (IN) 57 17.9 10.4 9.3 1.8 T T T 0.0 0.0 0.0 2.6 9.1 17.9
YEAR OF OCCURRENCE 2000 1979 1969 1983 1995 1996 1993 1975 1958 JAN 2000
MAXIMUM SNOW DEPTH (IN) 53 20 10 11 0 0 0 0 0 0 0 2 9 20
YEAR OF OCCURRENCE 2000 1979 1980 2000 1958 JAN 2000
NORMAL NO. DAYS WITH:
SNOWFALL 1.0 30 0.9 0.8 0.4 0.* 0.0 0.0 0.0 0.0 0.0 0.0 0.1 0.2 2.4

2001 Raleigh, North Carolina (RDU)

PRECIPITATION (inches) 2001 RALEIGH, NC (RDU)
YEAR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANNUAL
1972 1.97 4.13 2.50 1.92 5.34 4.16 6.80 4.17 5.80 3.96 5.98 5.01 51.74
1973 2.67 5.50 4.06 4.40 3.99 9.38 3.12 4.60 1.13 0.60 0.61 6.38 46.44
1974 4.39 2.87 3.34 1.32 7.67 4.02 1.56 4.82 3.71 1.23 1.79 4.02 40.74
1975 6.09 2.85 6.26 1.64 3.84 1.66 6.74 2.11 5.77 1.23 4.60 4.04 46.83
1976 3.07 1.54 3.17 0.23 4.74 2.55 1.00 1.52 5.99 3.97 1.89 4.04 33.71
1977 2.82 2.13 5.63 1.89 3.94 0.84 0.89 4.12 3.86 5.06 2.22 3.70 37.10
1978 7.03 1.43 4.40 6.10 4.20 4.06 3.63 1.86 1.37 1.46 4.17 3.26 42.97
1979 5.71 5.55 2.69 2.63 4.71 3.27 4.84 1.66 6.76 1.88 4.73 0.94 45.37
1980 4.39 1.91 5.87 1.97 2.33 4.89 2.11 1.87 3.76 2.25 2.87 1.42 35.64
1981 0.87 3.02 2.35 1.03 4.28 0.55 5.69 5.34 2.70 4.64 0.95 4.96 36.38
1982 3.43 4.97 3.02 3.33 4.20 8.39 3.34 1.83 1.55 3.93 2.34 4.02 44.35
1983 1.79 6.00 7.78 3.54 5.89 3.09 1.10 1.81 2.13 3.59 3.86 6.65 47.23
1984 4.93 5.65 5.40 4.45 5.43 3.08 9.20 1.13 2.31 0.73 1.64 2.32 46.27
1985 4.83 4.44 1.03 0.64 3.95 2.87 6.28 3.73 0.23 1.75 7.61 0.81 38.17
1986 1.88 1.65 3.06 1.01 2.98 1.92 4.32 12.18 0.95 1.28 2.77 2.95 36.95
1987 6.53 5.52 2.88 4.68 1.19 2.11 1.78 5.80 5.48 1.71 1.39 3.02 42.09
1988 3.15 2.42 1.76 3.56 2.85 2.88 2.69 3.40 4.90 5.67 3.34 1.04 37.66
1989 1.35 6.42 5.40 4.91 3.88 7.30 5.46 5.08 3.96 3.44 3.94 3.01 54.15
1990 3.07 3.82 5.02 2.19 6.97 1.03 2.22 2.65 0.30 5.69 1.51 3.08 37.55
1991 4.12 0.69 4.59 1.04 2.89 2.05 10.27 1.87 3.16 1.40 0.73 2.65 35.46
1992 3.80 2.23 2.95 1.93 2.60 5.12 3.45 7.63 2.22 3.79 5.02 2.44 43.18
1993 4.50 2.22 6.13 4.84 3.32 0.33 2.11 1.77 3.50 2.95 2.66 3.72 38.05
1994 3.55 2.97 5.91 0.86 2.85 2.20 4.67 4.20 1.99 4.62 1.32 1.27 36.41
1995 4.50 4.52 2.49 1.32 3.91 7.75 3.29 2.70 2.46 9.10 4.67 1.88 48.59
1996 4.24 2.94 3.39 3.98 3.26 3.28 6.98 3.72 16.65 3.48 4.33 2.89 59.14
1997 3.13 2.83 3.41 4.75 2.21 3.83 6.51 1.01 3.07 3.26 4.05 2.75 40.81
1998 7.49 5.79 7.36 3.12 3.79 3.45 4.84 4.66 3.55 2.79 2.40 3.44 52.68
1999 5.77 1.96 3.69 3.53 0.58 1.16 3.00 3.20 21.79 2.45 1.20 2.31 50.64
2000 6.27 2.20 1.76 4.66 1.23 2.50 6.19 6.64 3.82 T 2.56 1.51 39.34
2001 1.30 2.34 7.11 1.72 3.53 4.54 4.13 4.88 0.86 1.86 0.50 2.01 34.78
POR=115 YRS 3.53 3.63 3.81 3.20 3.81 4.03 5.06 4.85 3.77 2.89 2.61 3.17 44.36

2001 Raleigh, North Carolina (RDU)

AVERAGE TEMPERATURE (F) 2001 RALEIGH, NC (RDU)
YEAR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANNUAL
1972 44.7 40.0 49.5 58.0 64.3 69.9 77.1 75.6 70.4 57.4 48.1 46.2 58.4
1973 39.3 40.0 54.8 57.9 64.5 75.1 76.5 76.6 73.2 62.2 54.6 42.5 59.8
1974 49.3 42.9 54.4 60.2 67.4 71.8 76.5 76.0 69.0 56.5 48.7 43.2 59.7
1975 43.8 43.7 47.1 55.8 68.2 73.7 75.6 78.3 71.1 62.2 53.5 42.0 59.6
1976 37.6 50.1 56.2 60.7 66.8 74.7 78.6 75.4 69.7 55.7 42.5 37.1 58.8
1977 26.6 39.3 53.3 62.6 68.4 73.3 80.6 78.1 72.8 56.4 51.8 39.9 58.6
1978 35.3 33.1 48.2 59.2 66.0 75.8 78.0 79.9 73.7 59.5 55.1 44.9 59.1
1979 39.1 36.5 52.2 59.7 66.8 69.8 75.4 77.2 71.2 59.9 52.0 43.4 58.6
1980 40.6 36.5 46.5 62.0 69.8 75.0 78.9 79.6 74.9 58.7 49.1 40.7 59.4
1981 33.4 43.9 46.2 61.7 64.0 78.9 80.8 74.6 68.3 57.2 50.7 39.7 58.3
1982 35.5 45.5 51.7 57.4 71.0 74.7 79.1 76.5 70.5 60.6 51.9 47.5 60.2
1983 38.1 40.7 50.7 55.1 65.4 72.5 79.1 79.1 70.7 60.4 50.9 39.5 58.5
1984 36.3 45.7 47.2 55.9 65.5 75.5 74.9 76.6 67.5 66.3 47.1 49.7 59.0
1985 34.0 41.9 52.7 62.0 67.3 73.9 76.8 75.2 69.7 63.7 58.4 39.4 59.6
1986 38.5 44.5 51.7 61.2 67.4 78.4 81.7 75.6 72.3 63.0 52.9 42.6 60.8
1987 38.3 40.4 49.2 56.9 69.3 76.3 81.2 79.2 73.0 54.6 52.8 44.5 59.6
1988 34.7 41.9 50.6 57.8 66.0 72.4 79.0 80.3 70.3 54.4 52.0 42.4 58.5
1989 44.8 42.9 50.7 58.0 65.0 77.0 78.1 76.2 71.7 61.3 51.4 34.6 59.3
1990 48.0 51.0 54.9 60.3 67.4 75.2 80.0 78.0 72.2 64.1 54.2 48.1 62.8
1991 41.9 46.8 54.3 62.3 72.3 75.8 80.6 77.8 71.6 61.1 50.0 47.0 61.8
1992 43.4 46.2 50.5 59.2 63.2 72.0 80.4 74.1 71.5 58.1 51.9 42.5 59.4
1993 43.3 40.9 47.9 56.9 69.0 76.1 82.5 78.2 73.7 59.6 51.8 40.3 60.0
1994 36.9 44.2 52.2 63.6 64.2 77.0 79.6 76.0 69.1 59.3 54.0 47.9 60.3
1995 42.9 41.0 52.7 61.0 68.5 73.8 80.4 80.6 70.5 63.4 47.1 39.5 60.1
1996 38.3 42.5 45.3 58.4 67.7 76.4 78.6 75.2 70.3 61.0 45.7 45.8 58.8
1997 41.3 46.7 54.6 55.2 63.9 71.5 79.5 76.6 70.9 59.6 47.3 40.9 59.0
1998 44.7 46.1 50.2 58.8 69.2 77.3 79.5 77.8 74.6 61.1 52.0 46.6 61.5
1999 45.7 45.7 47.5 61.5 66.8 74.5 81.3 80.0 69.1 58.6 54.4 43.9 60.8
2000 38.4 45.8 53.4 57.6 70.0 77.2 77.0 76.1 69.4 60.2 48.0 35.5 59.1
2001 41.6 47.2 49.1 60.8 68.0 76.9 76.2 79.6 69.0 59.4 55.8 47.6 60.9
POR=115 YRS 41.1 42.9 50.4 59.3 67.9 75.2 77.7 76.4 71.6 60.7 50.8 42.7 59.7

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 Raleigh, North Carolina (RDU)

HEATING DEGREE DAYS (base 65 F) 2001 RALEIGH, NC (RDU)
YEAR JUL AUG SEP OCT NOV DEC JAN FEB MAR APR MAY JUN TOTAL
1972-73 0 0 9 238 504 576 790 692 334 231 88 0 3462
1973-74 0 0 2 126 312 690 481 614 346 187 48 0 2806
1974-75 0 0 44 268 501 668 651 589 553 293 34 0 3601
1975-76 0 0 17 117 351 705 843 426 300 194 52 6 3011
1976-77 0 0 7 302 668 857 1183 715 358 132 49 14 4285
1977-78 0 0 4 283 411 768 914 883 514 196 83 0 4056
1978-79 0 0 7 184 292 627 793 792 398 183 43 8 3327
1979-80 0 0 13 196 394 661 753 820 564 130 33 0 3564
1980-81 0 0 16 225 477 747 973 583 579 149 99 0 3848
1981-82 0 4 31 253 425 776 907 538 411 244 15 0 3604
1982-83 0 0 14 182 392 542 828 675 438 305 79 7 3462
1983-84 0 0 59 180 417 784 882 553 545 283 83 5 3791
1984-85 0 0 63 42 530 468 954 644 395 146 42 4 3288
1985-86 0 0 36 96 207 789 812 569 415 157 59 0 3140
1986-87 0 11 12 149 370 687 820 681 484 248 29 0 3491
1987-88 0 0 1 319 362 631 932 665 444 228 62 22 3666
1988-89 0 0 8 336 386 695 619 623 459 257 102 0 3485
1989-90 0 3 30 167 404 934 518 390 357 186 37 0 3026
1990-91 0 0 18 124 323 520 709 501 354 153 18 0 2720
1991-92 0 0 24 156 451 562 659 537 446 226 114 3 3178
1992-93 0 0 29 224 390 691 666 670 524 244 15 0 3453
1993-94 0 0 19 198 405 758 863 576 394 113 101 0 3427
1994-95 0 0 8 190 326 527 679 665 380 165 36 0 2976
1995-96 0 0 18 123 532 787 819 646 601 227 72 2 3827
1996-97 0 0 9 142 569 590 729 510 326 300 97 45 3317
1997-98 0 0 14 223 524 742 624 525 475 207 21 7 3362
1998-99 0 0 7 146 383 573 593 533 536 160 36 2 2969
1999-00 2 0 29 216 314 646 818 548 365 235 24 0 3197
2000-01 0 0 40 181 511 910 718 492 490 200 36 0 3578
2001- 0 0 50 211 287 532

2001 Raleigh, North Carolina (RDU)

COOLING DEGREE DAYS (base 65 F) 2001 RALEIGH, NC (RDU)
YEAR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANNUAL
1972 0 0 5 37 36 170 382 336 177 6 6 2 1157
1973 0 0 24 26 81 310 363 365 254 48 7 0 1478
1974 0 0 25 51 130 210 363 347 169 9 21 0 1325
1975 0 0 3 22 141 269 337 421 209 38 12 0 1452
1976 0 3 31 71 116 304 428 330 157 19 0 0 1459
1977 0 2 4 68 162 272 490 414 245 25 19 0 1701
1978 0 0 2 30 120 330 412 468 275 21 3 10 1671
1979 0 0 6 28 105 159 332 384 205 46 10 0 1275
1980 0 0 0 45 190 306 441 460 321 38 6 0 1807
1981 0 0 2 56 75 425 497 309 139 19 0 0 1522
1982 0 0 3 24 208 299 443 363 183 53 5 7 1588
1983 0 0 0 16 97 238 441 447 239 42 0 0 1520
1984 0 0 0 16 108 324 311 366 143 90 0 0 1358
1985 0 3 20 65 121 277 373 323 181 64 14 0 1441
1986 0 0 7 51 142 408 526 349 237 96 15 0 1831
1987 0 0 0 11 170 347 508 447 250 0 2 0 1735
1988 0 3 5 17 98 249 438 482 172 14 3 0 1481
1989 0 11 23 54 110 367 412 359 237 59 4 0 1636
1990 0 3 49 51 117 312 472 410 239 102 4 5 1764
1991 0 0 28 78 253 333 493 403 230 40 9 13 1880
1992 0 0 3 58 65 218 487 285 228 15 3 0 1362
1993 0 0 0 12 147 338 550 417 286 34 17 0 1801
1994 0 0 6 78 86 367 462 350 139 21 3 1 1513
1995 3 0 3 53 154 270 486 490 191 81 3 0 1734
1996 0 0 0 35 164 352 427 324 176 26 0 0 1504
1997 1 3 14 11 68 249 451 368 199 64 0 0 1428
1998 3 0 23 29 158 382 457 401 302 32 0 12 1799
1999 3 0 0 64 100 292 513 474 161 24 0 0 1631
2000 0 0 9 19 185 374 380 351 176 38 8 0 1540
2001 0 0 3 83 137 364 356 461 176 46 17 2 1645

2001 Raleigh, North Carolina (RDU)

SNOWFALL (inches) 2001 RALEIGH, NC (RDU)
YEAR JUL AUG SEP OCT NOV DEC JAN FEB MAR APR MAY JUN TOTAL
1972-73 0.0 0.0 0.0 0.0 T 0.0 6.4 4.5 0.4 0.0 0.0 0.0 11.3
1973-74 0.0 0.0 0.0 0.0 0.0 2.8 0.0 T 2.9 0.0 0.0 0.0 5.7
1974-75 0.0 0.0 0.0 0.0 0.0 T T T 0.6 0.0 0.0 0.0 0.6
1975-76 0.0 0.0 0.0 0.0 2.6 T 0.4 T 0.0 0.0 0.0 0.0 3.0
1976-77 0.0 0.0 0.0 0.0 T T 2.1 1.5 0.0 0.0 0.0 0.0 3.6
1977-78 0.0 0.0 0.0 0.0 T T T 9.0 1.6 0.0 0.0 0.0 10.6
1978-79 0.0 0.0 0.0 0.0 0.0 0.0 0.4 17.2 T 0.0 0.0 0.0 17.6
1979-80 0.0 0.0 0.0 0.0 0.0 0.0 2.2 5.0 11.1 0.0 0.0 0.0 18.3
1980-81 0.0 0.0 0.0 0.0 0.0 3.1 2.6 0.0 T 0.0 0.0 0.0 5.7
1981-82 0.0 0.0 0.0 0.0 0.0 T 6.0 0.6 0.0 0.0 0.0 0.0 6.6
1982-83 0.0 0.0 0.0 0.0 0.0 T T 2.7 7.3 1.8 0.0 0.0 11.8
1983-84 0.0 0.0 0.0 0.0 0.0 0.0 T 6.9 T 0.0 0.0 0.0 6.9
1984-85 0.0 0.0 0.0 0.0 0.0 0.0 4.1 T 0.0 0.0 0.0 0.0 4.1
1985-86 0.0 0.0 0.0 0.0 0.0 T T 0.9 T 0.0 0.0 0.0 0.9
1986-87 0.0 0.0 0.0 0.0 T 0.0 0.6 10.2 T T 0.0 0.0 10.8
1987-88 0.0 0.0 0.0 0.0 0.6 0.0 7.3 T 0.0 0.0 0.0 0.0 7.9
1988-89 0.0 0.0 0.0 0.0 0.0 0.1 0.0 11.1 0.5 0.3 0.0 0.0 12.0
1989-90 0.0 0.0 0.0 0.0 0.0 2.7 0.0 T T 0.0 0.0 0.0 2.7
1990-91 0.0 0.0 0.0 0.0 0.0 T T T T 0.0 0.0 0.0 T
1991-92 0.0 0.0 0.0 0.0 T 0.0 T T 0.0 0.0 0.0 0.0 T
1992-93 0.0 0.0 0.0 0.0 0.0 T T 1.6 0.9 0.0 0.0 0.0 2.5
1993-94 T 0.0 0.0 0.0 0.0 3.1 T 1.1 0.2 0.0 0.0 0.0 4.4
1994-95 0.0 0.0 0.0 0.0 0.0 0.0 0.8 1.4 T 0.0 T 0.0 2.2
1995-96 0.0 0.0 0.0 0.0 T T 5.6 8.1 0.9 0.0 T T 14.6
1996-97 0.4 T 0.0 0.0 T T
1997-98 0.0 0.0 0.0 0.0 0.0 0.4 2.0 0.0 T 0.0 0.0 T 2.4
1998-99 0.0 0.0 0.0 0.0 0.0 T T T T 0.0 0.0 0.0 T
1999-00 0.0 0.0 0.0 0.0 0.0 T 25.8 0.0 0.0 0.0 0.0 T 25.8
2000-01 0.0 0.0 0.0 0.0 2.2 0.1 T 0.3 T T T 0.0 2.6
2001- 0.0 0.0 0.0 0.0 0.0 0.0
POR=56 YRS T 0.0 0.0 0.0 0.1 0.8 2.6 2.5 1.3 0.0 T T 7.3



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