2001 WILMINGTON, DELAWARE (ILG)



Delaware is part of the Atlantic Coastal Plain consisting mainly of flat low land with many marshes. Small streams and tidal estuaries comprise the drainage of the State. Wilmington, at the northern end of the State, marks the beginning of low rolling hills extending northward and northwestward into Pennsylvania. The Delaware River, the Delaware Bay, and the Atlantic Ocean are along the eastern boundary of the State. The broad Chesapeake Bay lies 35 miles, or less, to the west of the western boundary of nearly the entire State. These large water areas considerably influence the climate of the Wilmington, Delaware region.

Summers are warm and humid, winters are usually mild. During the summer maximum temperatures are usually in the 80s. The temperature reaches 100 degrees on the average once in six years. During January, the coldest month of the year, the daily average temperature is 32 degrees. Temperatures of zero may be expected once in four years. Most of the winter precipitation falls as rain. Seasonal snowfall has been as little as 1 inch, and as much as 50 inches. Snow is frequently mixed with rain and sleet, and seldom remains on the ground more than a few days.

The proximity of large water areas and the inflow of southerly winds cause the relative humidity to be quite high all year. During the summer months the relative humidity is approximately 75 percent. Fog is relatively frequent and may occur in any month. Light southeast winds blowing up the Delaware Bay favor the formation of fog. Light north–northeast winds bring in smoke from Philadelphia and from the heavy industry area located along the Delaware River north of Wilmington.

Rainfall distribution throughout the year is fairly uniform, however, the greatest amounts normally come during the summer months. Mostly, the summer rainfall comes in the form of thunderstorms. Moisture deficiencies for crops occur occasionally, but severe droughts are rare. During the fall, winter, and spring seasons, much of the rainfall comes from storms forming over the southern states or the South Atlantic and moving northward along the coast. During the late summer and early fall, hurricanes occasionally cause heavy rainfall, but winds seldom reach hurricane force in Wilmington. Heavy rains occasionally cause minor flooding, but the streams and rivers of northern Delaware are not subject to major flooding. Strong easterly and southeasterly winds sometimes cause high tides in the Delaware Bay and the Delaware River, resulting in the flooding of lowlands and damage to bay front and river front properties.

Based on the 1951–1980 period, the average first occurrence of 32 degrees Fahrenheit in the fall is October 29 and the average last occurrence in the spring is April 13.

NORMALS, MEANS, AND EXTREMES

WILMINGTON, DE (ILG)

LATITUDE:    LONGITUDE:      ELEVATION (FT):    TIME ZONE:    WBAN: 13781

39 40′ 22″ N  75 36′ 03″ W  GRND: 92  BARO: 95  EASTERN (UTC + 5)

2001 Wilmington, Delaware (ILG)

ELEMENT POR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC YEAR
TEMPERATURE F NORMAL DAILY MAXIMUM 30 38.7 41.9 52.1 62.6 72.9 81.4 85.6 84.1 77.7 66.6 55.5 43.9 63.6
MEAN DAILY MAXIMUM 45 39.3 42.4 51.4 63.0 72.8 81.5 85.5 84.1 77.6 66.3 55.4 44.1 63.6
HIGHEST DAILY MAXIMUM 54 75 78 86 94 96 100 102 101 100 91 85 75 102
YEAR OF OCCURRENCE 1950 1985 1998 1985 1996 1994 1966 1955 1983 1951 1950 1998 JUL 1966
MEAN OF EXTREME MAXS. 54 59.8 62.4 73.0 81.9 88.4 93.3 95.4 93.5 90.0 81.8 72.6 63.9 79.7
NORMAL DAILY MINIMUM 30 22.4 24.8 33.1 41.8 52.2 61.6 67.1 65.9 58.2 45.7 37.0 27.6 44.8
MEAN DAILY MINIMUM 45 23.2 25.4 32.9 42.0 52.2 61.6 66.9 65.6 57.9 45.6 36.9 27.8 44.8
LOWEST DAILY MINIMUM 54 -14 -6 2 18 30 41 48 43 36 24 14 -7 -14
YEAR OF OCCURRENCE 1985 1979 1984 1982 1978 1972 1988 1982 1974 1976 1955 1983 JAN 1985
MEAN OF EXTREME MINS. 54 7.0 9.4 18.0 28.8 38.5 48.9 55.7 53.4 42.5 31.8 22.3 12.5 30.7
NORMAL DRY BULB 30 30.6 33.4 42.7 52.2 62.5 71.5 76.4 75.0 68.0 56.2 46.3 35.8 54.2
MEAN DRY BULB 54 32.0 34.1 42.2 52.6 62.4 71.5 76.3 74.7 67.6 56.4 46.0 36.0 54.3
MEAN WET BULB 49 29.0 30.5 37.2 46.1 55.7 64.2 68.7 67.8 61.6 51.3 41.5 32.6 48.8
MEAN DEW POINT 49 22.2 23.3 29.2 38.7 50.2 60.0 64.6 64.2 57.7 47.3 35.8 26.4 43.3
NORMAL NO. DAYS WITH:
MAXIMUM 90 30 0.0 0.0 0.0 0.2 0.7 3.3 7.6 4.9 1.9 0.0 0.0 0.0 18.6
MAXIMUM 32 30 8.8 5.0 0.6 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.1 3.9 18.4
MINIMUM 32 30 26.0 22.0 14.5 3.3 0.1 0.0 0.0 0.0 0.0 1.9 9.6 22.2 99.6
MINIMUM 0 30 0.6 0.3 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.1 1.0
H/C NORMAL HEATING DEG. DAYS 30 1066 885 691 384 122 0 0 0 35 288 561 905 4937
NORMAL COOLING DEG. DAYS 30 0 0 0 0 44 199 353 310 125 15 0 0 1046
RH NORMAL (PERCENT) 30 68 65 62 62 67 68 70 72 72 71 69 69 68
HOUR 01 LST 30 72 71 70 71 77 80 81 83 83 81 76 74 77
HOUR 07 LST 30 74 74 73 72 75 77 79 83 84 84 80 76 78
HOUR 13 LST 30 59 56 51 49 53 54 54 56 56 54 56 59 55
HOUR 19 LST 30 66 63 60 57 62 63 64 68 70 69 68 68 65
S PERCENT POSSIBLE SUNSHINE
W/O MEAN NO. DAYS WITH:
HEAVY FOG (VISBY 1/4 MI) 54 4.2 3.5 2.7 2.1 2.2 1.7 1.6 2.3 2.4 3.8 3.3 3.4 33.2
THUNDERSTORMS 54 0.2 0.3 1.1 2.3 3.8 5.5 6.1 5.4 2.4 0.9 0.6 0.2 28.8
CLOUDINESS MEAN:
SUNRISE-SUNSET (OKTAS) 1 6.0 5.0
MIDNIGHT-MIDNIGHT (OKTAS)
MEAN NO. DAYS WITH:
CLEAR 1 2.0 2.0 6.0 8.0 9.0 3.0 7.0 5.0 9.0 5.0
PARTLY CLOUDY 1 1.0 1.0 6.0 4.0 5.0 1.0 4.0 3.0 2.0 2.0
CLOUDY 1 4.0 5.0 11.0 6.0 8.0 2.0 7.0 3.0 8.0
PR MEAN STATION PRESSURE (IN) 29 30.00 29.99 29.94 29.90 29.90 29.90 29.92 29.96 29.99 30.02 30.02 30.01 29.96
MEAN SEA-LEVEL PRES. (IN) 49 30.08 30.07 30.02 29.99 30.00 29.98 30.00 30.02 30.08 30.10 30.07 30.10 30.04
WINDS MEAN SPEED (MPH) 42 9.8 10.1 11.0 10.4 8.8 8.2 7.7 7.3 7.7 8.0 9.0 9.1 8.9
PREVAIL. DIR (TENS OF DEGS) 26 30 30 30 30 30 18 30 18 32 31 30 30 30
MAXIMUM 2-MINUTE:
SPEED (MPH) 7 51 43 45 46 48 41 45 40 39 36 44 43 51
DIR. (TENS OF DEGS) 15 29 28 33 24 27 32 14 35 29 14 27 15
YEAR OF OCCURRENCE 1999 1996 1996 1995 1999 1998 1995 1997 2001 1995 1999 2000 JAN 1999
MAXIMUM 5-SECOND:
SPEED (MPH) 7 61 54 56 53 61 52 55 53 52 46 57 53 61
DIR. (TENS OF DEGS) 23 29 27 33 23 27 32 15 36 26 13 28 23
YEAR OF OCCURRENCE 1999 1996 1996 1995 1999 1998 1995 1997 2001 1999 1999 2000 MAY 1999
PRECIPITATION NORMAL (IN) 30 3.03 2.91 3.43 3.39 3.84 3.55 4.23 3.40 3.43 2.88 3.27 3.48 40.84
MAXIMUM MONTHLY (IN) 54 8.41 7.02 9.17 6.80 7.38 7.49 12.63 12.09 12.68 8.01 7.84 7.96 12.68
YEAR OF OCCURRENCE 1978 1979 2000 1983 1983 1972 1989 1955 1999 1995 1972 1996 SEP 1999
MINIMUM MONTHLY (IN) 54 0.52 0.83 0.81 0.35 0.22 0.21 0.16 0.25 0.82 0.08 0.49 0.19 0.08
YEAR OF OCCURRENCE 1981 1980 1966 1985 1964 1988 1955 1972 1970 2000 1976 1955 OCT 2000
MAXIMUM IN 24 HOURS (IN) 54 2.53 2.29 4.87 2.56 2.72 4.35 6.83 4.11 8.43 3.88 3.83 2.33 8.43
YEAR OF OCCURRENCE 1998 1966 2000 1961 1990 1972 1989 1971 1999 1966 1956 1996 SEP 1999
NORMAL NO. DAYS WITH:
PRECIPITATION 0.01 30 10.3 9.5 9.9 10.6 11.2 9.8 9.1 8.8 7.8 7.3 9.4 9.8 113.5
PRECIPITATION 1.00 30 0.7 0.6 1.0 0.7 0.9 0.8 1.2 0.9 1.1 0.7 0.8 1.0 10.4
SNOWFALL NORMAL (IN) 30 7.6 6.9 2.4 0.3 T 0.0 0.0 0.0 0.0 0.* 0.7 3.4 21.3
MAXIMUM MONTHLY (IN) 50 26.2 27.5 20.3 2.6 T T T 0.0 0.0 2.5 11.9 21.5 27.5
YEAR OF OCCURRENCE 1996 1979 1958 1982 1991 1992 1990 1979 1953 1966 FEB 1979
MAXIMUM IN 24 HOURS (IN) 50 22.0 16.5 15.6 2.4 T T T 0.0 0.0 2.5 11.9 12.4 22.0
YEAR OF OCCURRENCE 1996 1979 1958 1987 1991 1992 1990 1979 1953 1966 JAN 1996
MAXIMUM SNOW DEPTH (IN) 46 13 20 8 2 0 0 0 0 0 T 9 12 20
YEAR OF OCCURRENCE 1987 1979 1956 1987 1962 1953 1966 FEB 1979
NORMAL NO. DAYS WITH:
SNOWFALL 1.0 30 2.3 1.7 0.8 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.2 1.0 6.1

2001 Wilmington, Delaware (ILG)

PRECIPITATION (inches) 2001 WILMINGTON, DE (ILG)
YEAR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANNUAL
1972 2.50 5.43 2.40 4.47 3.85 7.49 2.07 0.25 1.64 4.20 7.84 5.99 48.13
1973 3.81 3.42 4.02 6.57 5.56 5.19 2.82 2.44 3.02 2.22 0.67 7.31 47.05
1974 2.92 1.73 4.56 3.08 3.96 3.97 1.49 5.11 5.65 1.77 1.19 4.18 39.61
1975 4.23 2.95 4.63 3.03 5.65 6.16 5.53 2.55 6.19 3.06 2.63 3.00 49.61
1976 4.21 1.70 2.25 1.40 5.05 2.14 4.33 2.00 2.11 6.12 0.49 1.79 33.59
1977 2.18 1.09 4.55 3.91 0.96 4.41 1.38 4.82 1.29 3.59 6.14 5.81 40.13
1978 8.41 1.77 5.59 2.16 6.94 3.00 5.53 5.97 2.18 1.48 2.69 5.56 51.28
1979 7.61 7.02 2.61 4.03 3.10 4.01 4.76 6.11 5.94 3.45 3.23 1.44 53.31
1980 2.44 0.83 6.22 4.55 2.40 4.23 3.49 1.09 1.44 3.99 2.41 0.83 33.92
1981 0.52 3.23 1.26 3.54 5.05 4.50 2.52 3.38 3.82 2.84 0.67 3.95 35.28
1982 3.75 2.71 2.87 5.41 3.72 4.70 2.70 4.68 2.30 1.97 3.87 2.39 41.07
1983 2.98 3.55 6.84 6.80 7.38 3.94 2.33 1.29 3.44 3.87 5.48 6.80 54.70
1984 1.25 4.27 5.40 4.24 5.03 4.54 6.53 1.56 2.02 3.31 1.63 1.94 41.72
1985 1.56 2.05 2.03 0.35 5.52 1.37 6.91 2.28 4.56 1.84 4.46 0.80 33.73
1986 4.21 2.77 1.19 2.77 1.69 4.05 3.99 2.88 2.75 4.04 6.42 6.11 42.87
1987 4.35 1.52 1.16 2.63 3.15 2.31 4.09 4.21 4.85 2.31 3.50 1.90 35.98
1988 2.46 4.14 1.82 2.59 4.95 0.21 8.29 3.03 2.18 1.94 5.29 0.90 37.80
1989 2.48 2.75 3.69 2.76 6.57 5.43 12.63 1.97 4.31 3.92 1.99 1.27 49.77
1990 3.56 1.35 2.15 3.42 7.03 3.94 4.27 6.15 2.64 2.85 1.61 5.16 44.13
1991 4.30 0.97 4.64 3.28 1.98 3.41 3.71 5.38 5.36 1.27 1.26 4.26 39.82
1992 1.05 1.81 4.36 1.76 4.48 3.14 4.34 2.21 4.30 1.11 4.27 4.21 37.04
1993 2.64 3.11 7.50 5.87 3.95 1.60 4.04 2.65 6.26 2.77 2.85 3.51 46.75
1994 5.00 3.55 7.36 2.85 3.69 2.11 7.01 5.68 2.10 0.85 2.96 2.24 45.40
1995 3.08 2.28 2.47 2.10 3.50 1.26 2.89 2.03 5.17 8.01 4.31 2.17 39.27
1996 4.58 1.19 3.63 4.98 3.27 5.00 6.25 3.04 4.05 4.70 3.25 7.96 51.90
1997 1.83 1.83 3.49 1.49 0.82 1.75 3.08 3.66 1.93 2.33 3.24 2.57 28.02
1998 4.80 2.95 4.86 2.91 4.13 4.66 2.18 3.14 1.76 2.80 1.26 1.01 36.46
1999 5.41 3.51 3.96 3.36 3.56 1.62 0.89 4.24 12.68 3.42 2.09 2.94 47.68
2000 3.83 2.00 9.17 3.43 2.94 4.83 4.64 2.47 7.30 0.08 2.54 2.80 46.03
2001 3.13 2.81 5.62 1.43 5.33 4.28 2.35 2.65 2.57 0.74 0.99 1.95 33.85
POR=108 YRS 3.34 3.01 3.81 3.46 3.67 3.70 4.50 4.44 3.72 2.99 3.19 3.41 43.24

2001 Wilmington, Delaware (ILG)

AVERAGE TEMPERATURE (F) 2001 WILMINGTON, DE (ILG)
YEAR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANNUAL
1972 36.1 32.6 41.3 50.0 62.5 68.6 76.9 75.5 69.6 53.5 45.2 41.6 54.5
1973 35.6 35.5 49.4 54.7 61.4 75.8 78.1 78.1 70.4 59.9 49.1 37.7 57.1
1974 36.2 33.1 44.3 55.5 62.4 70.4 76.7 76.1 66.5 53.2 46.6 38.9 55.0
1975 37.5 35.9 40.6 47.5 65.2 71.5 75.7 76.3 65.4 60.0 51.0 36.2 55.2
1976 27.7 41.2 46.5 54.7 59.9 72.4 74.2 73.7 66.9 52.5 40.4 31.0 53.4
1977 20.8 33.3 47.2 54.4 63.9 68.9 76.4 75.4 69.3 53.4 46.6 33.4 53.6
1978 27.2 22.8 37.6 50.3 60.3 70.6 73.4 77.1 66.7 54.1 46.8 37.2 52.0
1979 31.4 22.1 45.4 50.6 63.8 67.9 75.3 75.0 68.2 55.0 49.6 38.1 53.5
1980 32.4 29.9 40.0 54.6 64.9 68.9 77.7 78.2 71.3 54.8 43.3 33.1 54.1
1981 25.4 37.9 40.2 55.0 62.5 72.3 77.1 73.5 66.9 53.0 45.3 34.2 53.6
1982 24.2 34.2 41.8 50.6 65.0 69.9 77.3 72.0 67.4 56.0 47.5 41.3 53.9
1983 35.2 35.3 45.9 53.1 61.0 71.8 77.6 77.0 69.3 56.9 46.7 32.1 55.2
1984 24.8 38.6 35.6 50.7 61.2 73.8 75.2 75.2 63.7 61.2 43.3 42.1 53.8
1985 27.5 37.4 47.1 58.0 65.9 70.6 76.6 74.4 69.1 58.3 51.0 32.9 55.7
1986 32.2 31.6 43.6 52.4 65.7 72.1 77.1 72.5 67.5 57.2 44.1 37.3 54.4
1987 31.4 31.9 44.6 52.3 63.1 73.5 79.1 74.3 68.3 51.7 47.4 38.6 54.7
1988 27.4 34.8 44.2 50.8 62.9 71.6 79.4 77.3 65.8 51.0 46.7 35.1 53.9
1989 36.0 34.3 42.1 51.6 62.1 74.3 75.9 74.4 68.4 57.6 44.6 25.0 53.9
1990 40.5 41.1 46.0 53.7 61.5 72.1 77.4 74.6 66.7 60.0 48.4 41.0 56.9
1991 34.3 39.7 44.9 54.7 69.1 73.6 77.3 76.7 67.2 57.6 46.8 39.5 56.8
1992 35.2 37.2 41.5 52.0 60.7 69.6 76.3 72.2 67.3 53.2 47.2 38.3 54.2
1993 37.6 31.0 39.0 52.8 65.3 72.8 79.4 77.8 68.7 55.7 47.4 36.4 55.3
1994 26.3 31.6 41.8 58.4 60.0 75.8 79.8 73.2 67.2 53.9 49.7 40.0 54.8
1995 36.6 30.3 45.3 51.5 62.2 72.0 78.7 77.1 68.2 59.3 41.3 31.3 54.5
1996 29.9 33.3 38.4 52.6 60.1 73.0 74.1 74.0 67.7 55.1 40.1 39.2 53.1
1997 31.8 38.9 43.2 50.3 58.6 69.6 75.9 72.8 65.5 55.6 43.6 37.6 53.6
1998 39.8 41.0 44.7 54.2 65.3 70.5 75.1 75.5 70.9 57.0 46.9 41.0 56.8
1999 34.8 36.9 41.7 52.7 62.9 71.6 80.0 75.8 68.1 53.8 49.4 38.8 55.5
2000 31.5 36.6 47.3 51.9 63.8 72.0 72.9 72.7 65.0 56.4 44.2 30.1 53.7
2001 31.6 36.2 39.8 53.3 62.7 73.0 72.7 77.3 65.6 56.7 50.8 42.5 55.2
POR=107 YRS 32.3 33.5 42.2 52.3 62.7 71.4 76.1 74.3 67.8 56.5 45.8 35.5 54.2

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 Wilmington, Delaware (ILG)

HEATING DEGREE DAYS (base 65 F) 2001 WILMINGTON, DE (ILG)
YEAR JUL AUG SEP OCT NOV DEC JAN FEB MAR APR MAY JUN TOTAL
1972-73 0 0 20 356 586 716 902 820 477 322 143 0 4342
1973-74 0 0 15 179 469 839 886 887 635 300 137 7 4354
1974-75 0 0 65 362 553 805 847 808 753 520 84 5 4802
1975-76 0 0 56 177 418 888 1149 681 567 341 178 31 4486
1976-77 0 4 44 387 734 1047 1361 884 546 333 107 32 5479
1977-78 0 1 31 353 550 975 1165 1179 842 433 191 17 5737
1978-79 6 0 60 337 542 854 1037 1197 605 424 89 28 5179
1979-80 4 7 31 318 458 827 1004 1009 768 307 83 35 4851
1980-81 0 0 20 322 645 985 1222 752 763 299 135 4 5147
1981-82 0 0 57 370 585 947 1259 855 715 426 69 12 5295
1982-83 0 14 29 305 519 724 919 822 587 368 163 7 4457
1983-84 0 0 74 275 542 1013 1240 758 904 422 162 5 5395
1984-85 0 2 113 149 641 701 1154 766 550 248 73 7 4404
1985-86 0 0 45 213 411 986 1011 930 653 373 99 11 4732
1986-87 0 27 36 276 619 848 1032 923 628 374 143 2 4908
1987-88 0 2 22 406 521 811 1159 869 637 419 121 38 5005
1988-89 3 0 52 434 541 923 893 854 710 395 142 0 4947
1989-90 0 2 54 236 605 1231 749 661 593 368 127 6 4632
1990-91 2 1 69 214 494 734 943 700 617 320 61 5 4160
1991-92 0 0 64 244 541 785 914 799 723 386 169 12 4637
1992-93 0 1 57 363 527 817 843 945 799 360 64 12 4788
1993-94 0 0 55 286 526 879 1193 929 715 223 189 2 4997
1994-95 0 0 29 343 454 770 875 967 598 401 122 0 4559
1995-96 0 0 41 208 703 1033 1083 912 816 378 206 10 5390
1996-97 0 0 43 304 741 794 1025 729 672 436 201 56 5001
1997-98 2 0 71 324 635 844 775 667 645 317 89 27 4396
1998-99 0 0 22 241 536 738 926 782 715 362 95 7 4424
1999-00 0 1 36 340 462 807 1032 816 544 390 117 15 4560
2000-01 0 2 99 274 619 1074 1029 801 776 361 110 10 5155
2001- 1 0 73 271 418 691

2001 Wilmington, Delaware (ILG)

COOLING DEGREE DAYS (base 65 F) 2001 WILMINGTON, DE (ILG)
YEAR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANNUAL
1972 0 0 2 0 35 143 376 334 165 8 0 0 1063
1973 0 0 0 19 42 332 416 413 183 29 0 0 1434
1974 0 0 0 24 64 175 370 355 113 2 6 0 1109
1975 0 0 0 0 97 207 337 355 73 27 5 0 1101
1976 0 0 0 37 25 260 291 278 106 6 0 0 1003
1977 0 0 5 20 80 156 360 328 166 0 5 0 1120
1978 0 0 0 0 48 188 273 383 117 7 0 0 1016
1979 0 0 4 1 57 123 327 324 138 16 0 0 990
1980 0 0 0 0 83 159 400 417 214 10 0 0 1283
1981 0 0 0 9 62 228 381 270 120 3 0 0 1073
1982 0 0 0 2 75 163 391 238 107 32 1 0 1009
1983 0 0 0 17 47 218 398 378 209 29 0 0 1296
1984 0 0 0 0 50 276 321 327 80 34 0 0 1088
1985 0 0 4 47 106 181 366 300 174 13 0 0 1191
1986 0 0 0 0 129 227 379 267 116 40 0 0 1158
1987 0 0 0 3 91 264 446 295 129 0 0 0 1228
1988 0 0 0 0 62 242 455 389 80 5 0 0 1233
1989 0 0 6 0 61 287 345 299 162 17 0 0 1177
1990 0 0 10 36 23 227 395 304 127 66 0 0 1188
1991 0 0 1 18 197 271 390 371 135 23 2 0 1408
1992 0 0 0 3 39 156 358 230 134 3 0 0 923
1993 0 0 0 1 79 252 452 405 176 3 4 0 1372
1994 0 0 0 32 41 334 466 260 99 4 0 0 1236
1995 0 0 0 4 42 218 434 381 148 39 1 0 1267
1996 0 0 0 13 64 254 291 285 129 2 0 0 1038
1997 0 0 0 0 9 204 348 248 92 40 0 0 941
1998 0 0 22 0 106 195 320 337 204 2 0 0 1186
1999 0 0 0 0 40 211 476 342 139 1 0 0 1209
2000 0 0 0 3 89 230 253 247 106 11 0 0 939
2001 0 0 0 16 46 257 247 388 100 21 0 0 1075

2001 Wilmington, Delaware (ILG)

SNOWFALL (inches) 2001 WILMINGTON, DE (ILG)
YEAR JUL AUG SEP OCT NOV DEC JAN FEB MAR APR MAY JUN TOTAL
1972-73 0.0 0.0 0.0 T T T T 1.2 T T 0.0 0.0 1.2
1973-74 0.0 0.0 0.0 0.0 0.0 6.1 2.4 11.5 T T 0.0 0.0 20.0
1974-75 0.0 0.0 0.0 0.0 T T 5.1 4.8 1.1 T 0.0 0.0 11.0
1975-76 0.0 0.0 0.0 0.0 0.0 0.3 4.5 1.7 6.7 T 0.0 0.0 13.2
1976-77 0.0 0.0 0.0 0.0 0.1 3.2 14.5 T 0.0 T 0.0 0.0 17.8
1977-78 0.0 0.0 0.0 0.0 0.4 0.9 16.0 18.4 9.9 T 0.0 0.0 45.6
1978-79 0.0 0.0 0.0 0.0 4.5 T 12.0 27.5 0.2 T 0.0 0.0 44.2
1979-80 0.0 0.0 0.0 2.5 0.0 1.4 6.1 0.8 5.1 0.0 0.0 0.0 15.9
1980-81 0.0 0.0 0.0 0.0 0.5 1.4 6.5 T 3.7 0.0 0.0 0.0 12.1
1981-82 0.0 0.0 0.0 0.0 T 2.8 14.6 4.5 0.4 2.6 0.0 0.0 24.9
1982-83 0.0 0.0 0.0 0.0 T 5.8 T 18.5 0.3 0.5 0.0 0.0 25.1
1983-84 0.0 0.0 0.0 0.0 T T 9.7 T 5.2 T 0.0 0.0 14.9
1984-85 0.0 0.0 0.0 0.0 T 0.3 14.2 0.7 T 0.4 0.0 0.0 15.6
1985-86 0.0 0.0 0.0 0.0 0.0 1.4 3.1 9.7 T T 0.0 0.0 14.2
1986-87 0.0 0.0 0.0 0.0 T 0.3 21.4 15.7 0.2 2.4 0.0 0.0 40.0
1987-88 0.0 0.0 0.0 0.0 0.7 2.1 10.8 1.1 T T 0.0 0.0 14.7
1988-89 0.0 0.0 0.0 0.0 T 0.2 6.7 2.9 1.2 0.0 0.0 0.0 11.0
1989-90 0.0 0.0 0.0 0.0 5.6 8.9 1.5 1.0 1.3 1.6 0.0 0.0 19.9
1990-91 T 0.0 0.0 0.0 0.0 6.4 5.2 0.6 0.9 T T 0.0 13.1
1991-92 0.0 0.0 0.0 0.0 T 0.2 1.5 1.3 0.5 T 0.0 T 3.5
1992-93 0.0 0.0 0.0 0.0 T 0.1 1.4 10.0 13.9 0.0 0.0 0.0 25.4
1993-94 0.0 0.0 0.0 0.0 T 2.4 2.7 9.2 3.4 0.0 0.0 0.0 17.7
1994-95 0.0 0.0 0.0 0.0 T 0.0 T 8.3 T 0.0 0.0 0.0 8.3
1995-96 0.0 0.0 0.0 0.0 3.2 7.1 26.2 7.5 6.0 5.9 T 0.0 55.9
1996-97 0.0 0.0 0.0 0.0 0.0 T 0.8 5.6 6.5 2.8 0.0 0.0 15.7
1997-98 0.0 0.0 0.0 0.0 0.0 T T 0.0 T 0.0 0.0 0.0 T
1998-99 0.0 0.0 0.0 0.0 0.0 2.0 4.5 0.0 2.0 0.0 0.0 0.0 8.5
1999-00 0.0 0.0 0.0 0.0 0.0 0.0 14.2 4.0 0.0 2.1 0.0 0.0 20.3
2000-01 0.0 0.0 0.0 0.0 0.0 2.1 4.8 5.0 0.7 T 0.0 0.0 12.6
2001- 0.0 0.0 0.0 0.0 0.0 0.0
POR=51 YRS T 0.0 0.0 0.1 0.9 3.1 6.9 6.0 3.1 0.2 T T 20.3



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