2001 PHILADELPHIA, PENNSYLVANIA (PHL)



The Appalachian Mountains to the west and the Atlantic Ocean to the east have a moderating effect on climate. Periods of very high or very low temperatures seldom last for more than three or four days. Temperatures below zero or above 100 degrees are a rarity. On occasion, the area becomes engulfed with maritime air during the summer months, and high humidity adds to the discomfort of seasonably warm temperatures.

Precipitation is fairly evenly distributed throughout the year with maximum amounts during the late summer months. Much of the summer rainfall is from local thunderstorms and amounts vary in different areas of the city. This is due, in part, to the higher elevations to the west and north. Snowfall amounts are often considerably larger in the northern suburbs than in the central and southern parts of the city. In many cases, the precipitation will change from snow to rain within the city. Single storms of 10 inches or more occur about every five years.

The prevailing wind direction for the summer months is from the southwest, while northwesterly winds prevail during the winter. The annual prevailing direction is from the west–southwest. Destructive velocities are comparatively rare and occur mostly in gustiness during summer thunderstorms. High winds occurring in the winter months, as a rule, come with the advance of cold air after the passage of a deep low pressure system. Only rarely have hurricanes in the vicinity caused widespread damage, primarily because of flooding.

Flood stages in the Schuylkill River normally occur about twice a year. Flood stages seldom last over 12 hours and usually occur after excessive thunderstorms. Flooding rarely occurs on the Delaware River.

NORMALS, MEANS, AND EXTREMES

PHILADELPHIA, PA (PHL)

LATITUDE:    LONGITUDE:     ELEVATION (FT):    TIME ZONE:    WBAN: 13739

39 52′ 06″ N  75 13′ 52″ W  GRND:  59  BARO: � 0;62  EASTERN (UTC + 5)

2001 Philadelphia, Pennsylvania (PHL)

ELEMENT POR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC YEAR
TEMPERATURE F NORMAL DAILY MAXIMUM 30 37.9 41.0 51.6 62.6 73.1 81.7 86.1 84.6 77.6 66.3 55.1 43.4 63.4
MEAN DAILY MAXIMUM 54 39.6 42.5 51.2 63.3 73.3 82.2 86.5 84.8 77.5 66.7 55.2 43.9 63.9
HIGHEST DAILY MAXIMUM 60 74 74 87 94 97 100 104 101 100 96 81 73 104
YEAR OF OCCURRENCE 1950 1997 1945 1976 1991 1994 1966 2001 1953 1941 1993 1998 JUL 1966
MEAN OF EXTREME MAXS. 54 59.8 61.9 73.0 82.6 88.6 93.5 95.9 93.9 90.3 81.8 72.5 63.3 79.8
NORMAL DAILY MINIMUM 30 22.8 24.8 33.2 42.1 52.7 61.8 67.2 66.3 58.7 46.4 37.6 28.1 45.1
MEAN DAILY MINIMUM 54 24.5 26.5 33.4 42.9 52.9 62.2 67.8 66.5 58.9 47.3 37.8 28.9 45.8
LOWEST DAILY MINIMUM 60 -7 -4 7 19 28 44 51 44 35 25 15 1 -7
YEAR OF OCCURRENCE 1984 1961 1984 1982 1966 1984 1966 1986 1963 1969 1976 1983 JAN 1984
MEAN OF EXTREME MINS. 54 8.7 10.5 18.7 30.0 40.7 50.2 57.5 55.5 44.2 33.3 23.8 14.0 32.3
NORMAL DRY BULB 30 30.4 33.0 42.4 52.4 62.9 71.8 76.7 75.5 68.2 56.4 46.4 35.8 54.3
MEAN DRY BULB 54 32.1 34.5 42.3 53.0 63.0 72.2 77.1 75.7 68.2 57.0 46.6 36.4 54.8
MEAN WET BULB 18 30.3 32.2 38.2 47.0 56.8 65.4 69.8 68.6 62.3 52.3 42.9 34.1 50.0
MEAN DEW POINT 18 23.3 24.5 30.0 39.7 50.6 60.3 65.4 64.4 57.7 47.0 36.6 27.0 43.9
NORMAL NO. DAYS WITH:
MAXIMUM 90 30 0.0 0.0 0.0 0.4 0.8 4.0 8.8 6.4 1.9 0.0 0.0 0.0 22.3
MAXIMUM 32 30 9.4 5.7 0.7 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.1 4.2 20.1
MINIMUM 32 30 26.2 22.3 14.0 2.6 * 0.0 0.0 0.0 0.0 1.5 8.5 21.2 96.3
MINIMUM 0 30 0.5 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.6
H/C NORMAL HEATING DEG. DAYS 30 1073 896 701 378 123 5 0 0 32 283 558 905 4954
NORMAL COOLING DEG. DAYS 30 0 0 0 0 58 209 363 326 128 17 0 0 1101
RH NORMAL (PERCENT) 30 66 64 62 60 65 68 70 70 72 71 68 68 67
HOUR 01 LST 30 70 68 68 69 76 80 81 82 82 81 75 72 75
HOUR 07 LST 30 73 71 72 70 74 77 79 81 83 83 78 74 76
HOUR 13 LST 30 59 55 52 49 53 54 54 55 56 54 56 59 55
HOUR 19 LST 30 65 61 57 54 59 61 63 65 69 69 66 67 63
S PERCENT POSSIBLE SUNSHINE 58 49 53 55 55 56 62 61 62 59 59 52 49 56
W/O MEAN NO. DAYS WITH:
HEAVY FOG(VISBY 1/4 MI) 62 2.6 2.3 1.7 1.2 1.3 1.0 0.8 1.0 1.5 3.0 2.3 2.5 21.2
THUNDERSTORMS 62 0.3 0.3 1.0 2.0 4.1 5.1 5.5 4.8 2.4 0.8 0.6 0.2 27.1
CLOUDINESS MEAN:
SUNRISE-SUNSET (OKTAS) 1 6.4 5.6
MIDNIGHT-MIDNIGHT (OKTAS) 1 5.6
MEAN NO. DAYS WITH:
CLEAR 1 3.0 2.0 8.0 8.0 11.0
PARTLY CLOUDY 1 1.0 4.0 5.0 3.0
CLOUDY 1 3.0 6.0 8.0 7.0 9.0
PR MEAN STATION PRESSURE(IN) 29 30.05 30.05 30.00 29.95 29.95 29.95 29.97 30.01 30.05 30.07 30.06 30.06 30.01
MEAN SEA-LEVEL PRES. (IN) 18 30.10 30.09 30.04 29.98 29.98 29.97 29.99 30.03 30.06 30.10 30.11 30.10 30.05
WINDS MEAN SPEED (MPH) 61 10.4 10.9 11.4 10.9 9.6 8.8 8.2 7.9 8.4 8.9 9.7 10.1 9.6
PREVAIL. DIR (TENS OF DEGS) 38 29 30 29 23 23 23 23 23 23 23 23 29 23
MAXIMUM 2-MINUTE:
SPEED (MPH) 6 44 43 40 37 40 51 41 41 39 36 40 45 51
DIR. (TENS OF DEGS) 28 29 27 31 31 30 33 25 32 35 28 27 30
YEAR OF OCCURRENCE 1999 1996 1996 2001 1997 1998 1999 1997 1998 1996 1996 2000 JUN 1998
MAXIMUM 5-SECOND:
SPEED (MPH) 6 57 52 52 51 51 71 46 52 49 46 52 53 71
DIR. (TENS OF DEGS) 18 31 26 28 29 30 32 24 31 35 27 28 30
YEAR OF OCCURRENCE 1996 1996 1996 2000 1997 1998 1999 1997 1996 1996 1996 2000 JUN 1998
PRECIPITATION NORMAL (IN) 30 3.21 2.79 3.46 3.62 3.75 3.74 4.28 3.80 3.42 2.62 3.34 3.38 41.41
MAXIMUM MONTHLY (IN) 59 8.86 6.44 7.01 8.12 7.41 7.88 10.42 9.70 13.07 5.99 9.06 8.47 13.07
YEAR OF OCCURRENCE 1978 1979 1980 1983 1948 1973 1994 1955 1999 1995 1972 1996 SEP 1999
MINIMUM MONTHLY (IN) 59 0.45 0.75 0.68 0.52 0.47 0.11 0.64 0.49 0.44 0.09 0.32 0.25 0.09
YEAR OF OCCURRENCE 1955 1991 1966 1985 1964 1949 1957 1964 1968 1963 1976 1955 OCT 1963
MAXIMUM IN 24 HOURS (IN) 55 2.70 1.96 3.08 2.76 3.18 4.62 4.49 5.68 6.77 3.85 3.99 3.03 6.77
YEAR OF OCCURRENCE 1979 1966 2000 1970 1984 1973 1989 1971 1999 1980 1977 1992 SEP 1999
NORMAL NO. DAYS WITH:
PRECIPITATION 0.01 30 10.4 9.8 10.0 10.6 11.2 10.0 9.1 8.7 7.9 7.3 9.9 10.5 115.4
PRECIPITATION 1.00 30 0.8 0.6 1.0 0.9 0.9 1.0 1.4 1.2 1.0 0.7 0.9 0.8 11.2
SNOWFALL NORMAL (IN) 30 7.8 7.5 3.3 0.5 T 0.0 0.0 0.0 0.0 0.1 0.6 3.4 23.2
MAXIMUM MONTHLY (IN) 58 23.4 27.6 13.4 4.3 T T 0.0 0.0 0.0 2.1 8.8 18.8 27.6
YEAR OF OCCURRENCE 1978 1979 1958 1971 1963 1993 1979 1953 1966 FEB 1979
MAXIMUM IN 24 HOURS (IN) 58 13.2 21.3 12.0 4.3 T T 0.0 0.0 0.0 2.1 8.7 14.6 21.3
YEAR OF OCCURRENCE 1961 1983 1993 1971 1963 1993 1979 1953 1960 FEB 1983
MAXIMUM SNOW DEPTH (IN) 53 12 22 12 3 0 0 0 0 0 0 8 12 22
YEAR OF OCCURRENCE 1961 1983 1993 1997 1953 1966 FEB 1983
NORMAL NO. DAYS WITH:
SNOWFALL 1.0 30 2.3 1.8 1.0 0.2 0.0 0.0 0.0 0.0 0.0 0.* 0.2 0.9 6.4

2001 Philadelphia, Pennsylvania (PHL)

PRECIPITATION (inches) 2001 PHILADELPHIA, PA (PHL)
YEAR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANNUAL
1972 2.34 5.09 2.69 4.08 4.11 5.79 2.62 3.76 1.12 3.77 9.06 5.20 49.63
1973 3.93 2.96 3.52 6.68 4.14 7.88 2.39 2.03 3.39 2.16 0.64 6.34 46.06
1974 2.95 2.14 4.91 2.77 3.21 4.43 2.08 3.83 4.68 1.93 0.81 4.04 37.78
1975 4.00 2.91 4.68 2.97 4.99 7.57 6.32 2.21 7.21 3.24 3.14 2.89 52.13
1976 4.50 1.66 2.38 2.06 4.35 3.42 4.04 2.17 2.44 4.30 0.32 1.63 33.27
1977 2.61 1.33 4.19 5.59 0.70 5.33 1.47 8.70 3.44 3.11 7.76 5.19 49.42
1978 8.86 1.35 4.31 1.76 6.01 1.75 5.27 6.04 1.59 1.20 2.20 5.61 45.95
1979 8.74 6.44 2.43 4.08 3.98 4.34 3.95 5.95 4.89 3.84 2.48 1.67 52.79
1980 2.27 0.96 7.01 4.79 3.22 1.73 6.58 0.80 2.79 5.03 2.85 0.77 38.80
1981 0.50 2.94 1.61 3.60 4.53 4.40 4.54 5.11 2.83 2.68 0.95 4.14 37.83
1982 4.45 3.16 2.66 6.06 4.47 5.76 1.94 2.20 2.32 1.94 3.67 1.80 40.43
1983 2.81 3.53 6.70 8.12 7.03 2.75 0.68 2.57 3.45 3.69 5.71 7.37 54.41
1984 2.22 2.81 6.14 4.25 6.87 2.85 6.99 3.28 1.96 2.56 1.56 2.17 43.66
1985 1.55 2.44 1.95 0.52 4.99 1.88 4.66 2.82 5.78 1.54 6.09 0.98 35.20
1986 4.13 3.38 1.25 4.46 0.70 1.99 4.10 3.70 2.33 2.22 6.27 5.89 40.42
1987 4.58 1.17 1.16 3.63 3.15 2.01 4.82 3.72 2.78 2.62 2.08 1.68 33.40
1988 2.72 4.11 2.24 2.92 3.67 0.57 8.07 3.16 2.62 2.16 5.17 1.00 38.41
1989 2.41 3.25 4.41 2.27 6.76 4.73 9.44 3.92 5.03 3.44 1.79 1.21 48.66
1990 4.09 1.44 2.59 3.16 6.08 3.39 2.62 4.07 1.71 1.68 1.17 3.79 35.79
1991 4.10 0.75 4.13 2.81 1.82 3.36 4.79 3.86 3.58 1.61 1.55 3.86 36.22
1992 0.88 1.31 3.19 1.26 2.74 1.84 5.05 2.00 3.04 1.23 3.26 4.61 30.41
1993 1.97 3.03 6.61 4.20 2.42 1.52 1.98 5.18 6.66 2.69 2.23 3.69 42.18
1994 4.27 3.27 6.44 2.86 3.66 1.74 10.42 4.54 1.64 0.94 3.03 2.11 44.92
1995 3.10 2.41 1.67 1.96 2.67 0.62 2.92 1.15 3.55 5.99 3.34 2.15 31.53
1996 4.39 2.12 4.27 4.48 3.25 4.73 8.17 4.29 4.95 4.30 3.03 8.47 56.45
1997 2.80 2.48 3.91 2.58 2.32 1.49 2.38 4.56 1.59 1.83 3.49 3.09 32.52
1998 4.24 3.25 3.93 2.70 3.87 4.91 1.79 1.26 1.86 1.84 1.18 0.82 31.65
1999 4.89 2.95 4.02 3.31 3.70 1.16 1.22 5.32 13.07 3.55 2.31 2.99 48.49
2000 3.22 2.02 6.32 3.05 3.03 3.82 5.54 2.90 8.28 1.51 2.21 2.82 44.72
2001 2.77 3.04 5.44 1.49 3.99 5.93 1.30 0.97 2.58 0.83 0.56 2.11 31.01
POR= 130 YRS 3.24 3.02 3.60 3.32 3.44 3.54 4.20 4.25 3.33 2.68 3.07 3.12 40.81

2001 Philadelphia, Pennsylvania (PHL)

AVERAGE TEMPERATURE (F) 2001 PHILADELPHIA, PA (PHL)
YEAR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANNUAL
1972 35.1 32.4 40.7 49.7 63.6 68.7 77.1 76.0 69.2 52.7 43.6 39.9 54.1
1973 34.4 33.6 47.2 53.4 60.3 74.6 77.9 78.8 70.7 59.2 48.0 38.6 56.4
1974 35.9 31.7 43.3 55.8 62.4 70.3 76.9 76.8 68.1 54.8 48.5 39.4 55.3
1975 37.3 35.8 41.2 48.7 66.6 72.2 76.6 77.1 66.6 61.2 52.7 36.9 56.1
1976 28.7 40.9 46.3 56.6 62.7 75.2 75.3 74.8 67.3 52.5 39.9 30.3 54.2
1977 20.0 33.6 48.8 57.2 65.8 68.6 77.8 76.2 69.9 54.3 46.4 32.6 54.3
1978 28.0 24.7 39.0 50.6 61.4 72.6 75.6 79.2 68.5 55.5 47.9 38.6 53.5
1979 32.5 23.0 47.0 52.3 66.4 69.1 76.2 75.5 68.5 54.9 50.1 38.2 54.5
1980 31.8 29.7 40.2 54.7 65.4 70.6 78.5 80.0 72.2 54.9 43.2 32.5 54.5
1981 25.3 37.9 40.0 54.7 62.6 72.0 76.9 74.9 66.8 53.1 45.6 34.6 53.7
1982 24.7 34.4 41.7 50.2 65.9 68.7 76.9 73.5 67.6 56.9 48.4 41.3 54.2
1983 34.1 34.0 43.7 51.0 62.1 72.0 77.9 77.1 69.0 56.6 46.7 33.2 54.8
1984 26.2 38.7 35.5 50.2 60.2 73.0 73.9 75.2 64.7 61.2 44.4 41.9 53.8
1985 27.3 35.3 44.6 55.5 64.5 68.8 75.4 74.1 69.1 59.3 51.3 33.3 54.9
1986 32.8 32.1 44.5 53.3 66.8 73.8 78.1 74.0 68.3 57.8 44.5 37.9 55.3
1987 31.9 32.5 45.7 53.1 63.9 74.6 79.5 75.4 68.8 52.5 48.0 39.2 55.4
1988 27.3 34.6 44.7 51.3 63.6 72.3 80.7 78.3 66.7 51.8 47.7 35.4 54.5
1989 36.5 34.8 42.3 52.4 62.4 74.7 76.3 75.6 69.7 58.3 44.9 25.5 54.5
1990 40.3 41.2 46.1 53.3 61.3 72.2 78.0 75.8 68.0 61.9 49.7 42.1 57.5
1991 35.2 40.0 46.1 55.5 70.8 75.7 79.0 79.0 69.5 58.9 47.3 39.6 58.1
1992 35.7 37.5 41.6 53.2 62.5 71.3 77.1 73.5 68.4 55.2 48.0 38.8 55.2
1993 38.2 31.9 39.8 54.2 66.4 74.4 81.4 78.9 69.7 58.0 49.0 38.4 56.7
1994 27.4 33.2 42.8 59.5 62.5 78.1 82.1 74.9 68.3 57.5 51.7 41.9 56.7
1995 38.2 31.5 47.3 54.5 64.3 74.3 81.5 79.9 70.4 61.4 43.0 31.6 56.5
1996 30.2 33.9 38.7 52.7 60.6 73.0 74.4 74.5 68.7 56.3 41.3 40.2 53.7
1997 32.5 40.0 44.1 51.4 59.5 71.1 77.5 73.9 67.1 57.3 44.4 38.5 54.8
1998 41.0 41.8 45.5 55.3 66.2 71.5 77.5 78.0 71.8 58.3 48.2 42.0 58.1
1999 35.0 38.0 42.4 53.5 64.0 72.9 81.2 77.4 69.9 56.1 50.9 39.9 56.8
2000 32.1 37.5 48.0 52.6 64.2 72.6 74.1 74.1 66.4 57.7 45.4 31.3 54.7
2001 32.5 37.4 41.1 54.9 64.7 75.2 75.4 79.9 68.4 59.1 52.9 43.7 57.1
POR= 128 YRS 32.8 34.0 41.9 52.4 63.1 71.9 76.8 74.9 68.4 57.3 46.4 36.4 54.7

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 Philadelphia, Pennsylvania (PHL)

HEATING DEGREE DAYS (base 65 F) 2001 PHILADELPHIA, PA (PHL)
YEAR JUL AUG SEP OCT NOV DEC JAN FEB MAR APR MAY JUN TOTAL
1972-73 0 0 22 378 635 775 940 874 547 359 176 1 4707
1973-74 0 0 18 196 507 810 897 926 667 292 128 11 4452
1974-75 0 0 46 313 500 786 852 812 732 483 66 4 4594
1975-76 0 0 45 152 372 866 1120 692 572 307 119 13 4258
1976-77 0 2 42 387 743 1069 1390 873 505 258 73 36 5378
1977-78 0 0 24 328 558 998 1139 1121 797 423 161 10 5559
1978-79 5 0 41 296 507 811 999 1170 556 378 38 17 4818
1979-80 4 7 28 324 439 823 1021 1016 763 301 72 17 4815
1980-81 0 0 22 320 646 999 1222 752 768 309 129 4 5171
1981-82 0 0 58 364 576 936 1243 850 714 440 50 25 5256
1982-83 0 8 31 277 497 730 951 861 653 423 128 2 4561
1983-84 0 0 70 283 540 981 1196 756 911 438 181 13 5369
1984-85 0 0 92 138 613 709 1161 824 627 306 89 9 4568
1985-86 0 0 38 187 407 975 990 914 628 345 77 6 4567
1986-87 0 21 23 255 609 838 1017 904 591 359 129 1 4747
1987-88 0 0 20 379 504 796 1162 876 624 404 105 32 4902
1988-89 0 0 35 408 513 908 876 840 700 371 138 0 4789
1989-90 0 0 43 220 594 1219 757 662 588 375 127 6 4591
1990-91 2 1 55 171 453 701 920 694 576 296 44 0 3913
1991-92 0 0 42 215 527 778 903 789 720 356 124 9 4463
1992-93 0 1 49 310 504 804 824 920 773 314 47 6 4552
1993-94 0 0 34 219 479 820 1156 881 681 193 132 0 4595
1994-95 0 0 20 231 392 710 824 932 542 318 82 0 4051
1995-96 0 0 21 159 656 1029 1072 894 809 370 191 7 5208
1996-97 0 0 34 265 704 761 999 695 643 401 172 42 4716
1997-98 2 0 45 278 612 811 738 644 619 287 67 13 4116
1998-99 0 0 14 207 498 706 920 751 691 336 77 3 4203
1999-00 0 0 22 275 415 772 1012 792 519 371 107 15 4300
2000-01 0 0 73 230 584 1039 999 768 734 320 74 4 4825
2001- 0 0 48 211 358 652

2001 Philadelphia, Pennsylvania (PHL)

COOLING DEGREE DAYS (base 65 F) 2001 PHILADELPHIA, PA (PHL)
YEAR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANNUAL
1972 0 0 3 0 47 143 381 344 153 3 0 0 1074
1973 0 0 0 16 35 294 404 435 193 23 0 0 1400
1974 0 0 0 24 55 179 373 372 145 5 12 0 1165
1975 0 0 0 0 121 224 366 380 98 42 12 0 1243
1976 0 0 0 64 58 326 326 315 115 7 0 0 1211
1977 0 0 10 32 104 150 402 355 175 3 6 0 1237
1978 0 0 0 0 57 244 338 447 153 8 0 0 1247
1979 0 0 6 5 90 146 357 339 137 16 1 0 1097
1980 0 0 0 0 89 194 428 470 244 10 0 0 1435
1981 0 0 0 9 62 224 373 315 119 1 0 0 1103
1982 0 0 0 3 85 142 376 280 115 31 5 0 1037
1983 0 0 0 11 43 217 409 380 199 27 0 0 1286
1984 0 0 0 0 39 260 283 324 90 30 0 0 1026
1985 0 0 0 27 81 133 330 291 166 19 0 0 1047
1986 0 0 0 0 139 278 413 307 129 40 0 0 1306
1987 0 0 0 7 101 295 456 332 142 0 0 0 1333
1988 0 0 0 1 70 259 495 418 93 7 0 0 1343
1989 0 0 1 1 62 298 357 332 192 18 1 0 1262
1990 0 0 9 29 20 226 413 341 152 83 1 0 1274
1991 0 0 1 21 230 327 443 437 183 30 0 0 1672
1992 0 0 0 10 54 205 380 268 158 13 0 0 1088
1993 0 0 0 0 95 298 517 438 181 11 6 0 1546
1994 0 0 0 34 63 401 540 313 125 4 0 0 1480
1995 0 0 0 8 66 284 519 468 189 53 1 0 1588
1996 0 0 0 9 61 257 301 305 151 2 1 0 1087
1997 0 0 0 0 9 230 397 280 113 49 0 0 1078
1998 0 0 20 3 114 216 397 410 223 3 0 0 1386
1999 0 0 0 0 51 246 508 394 177 4 0 0 1380
2000 0 0 0 3 89 251 286 286 123 12 0 0 1050
2001 0 0 0 22 72 316 330 468 158 37 1 0 1404

2001 Philadelphia, Pennsylvania (PHL)

SNOWFALL (inches) 2001 PHILADELPHIA, PA (PHL)
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 T T T 0.0 0.0 T
1973-74 0.0 0.0 0.0 0.0 T 4.6 4.1 12.1 T T 0.0 0.0 20.8
1974-75 0.0 0.0 0.0 0.0 T 0.8 3.9 6.6 2.3 T 0.0 0.0 13.6
1975-76 0.0 0.0 0.0 0.0 0.0 1.1 6.4 3.1 6.9 0.0 0.0 0.0 17.5
1976-77 0.0 0.0 0.0 0.0 T 2.8 15.7 0.2 T 0.0 0.0 0.0 18.7
1977-78 0.0 0.0 0.0 0.0 0.2 0.2 23.4 19.0 12.1 T 0.0 0.0 54.9
1978-79 0.0 0.0 0.0 0.0 2.5 T 10.1 27.6 T T 0.0 0.0 40.2
1979-80 0.0 0.0 0.0 2.1 T 4.9 6.1 0.4 7.4 T 0.0 0.0 20.9
1980-81 0.0 0.0 0.0 0.0 0.2 1.4 5.0 T 8.8 0.0 0.0 0.0 15.4
1981-82 0.0 0.0 0.0 0.0 T 2.8 14.0 3.5 1.1 4.0 0.0 0.0 25.4
1982-83 0.0 0.0 0.0 0.0 0.0 6.8 0.2 26.1 0.9 1.9 0.0 0.0 35.9
1983-84 0.0 0.0 0.0 0.0 0.8 T 10.5 T 10.3 T 0.0 0.0 21.6
1984-85 0.0 0.0 0.0 0.0 T 0.2 11.9 4.4 T T 0.0 0.0 16.5
1985-86 0.0 0.0 0.0 0.0 0.0 1.5 3.4 11.5 T T 0.0 0.0 16.4
1986-87 0.0 0.0 0.0 0.0 T 0.4 15.2 10.1 T T 0.0 0.0 25.7
1987-88 0.0 0.0 0.0 0.0 1.4 1.5 10.6 1.5 T 0.0 0.0 0.0 15.0
1988-89 0.0 0.0 0.0 0.0 0.0 0.4 6.0 2.4 2.4 0.0 0.0 0.0 11.2
1989-90 0.0 0.0 0.0 0.0 4.6 5.3 1.4 0.9 2.4 2.4 0.0 0.0 17.0
1990-91 0.0 0.0 0.0 0.0 0.0 6.4 6.5 1.0 0.7 0.0 0.0 0.0 14.6
1991-92 0.0 0.0 0.0 0.0 T T 1.2 1.0 2.5 T 0.0 0.0 4.7
1992-93 0.0 0.0 0.0 0.0 T T 1.0 10.9 12.4 T 0.0 T 24.3
1993-94 0.0 0.0 0.0 0.0 T 0.9 4.1 13.2 4.9 0.0 0.0 0.0 23.1
1994-95 0.0 0.0 0.0 0.0 T 0.0 T 9.8 T 0.0 0.0 0.0 9.8
1995-96 0.0 0.0 0.0 0.0 1.9 7.3 33.8 12.9 7.2 2.4 0.0 0.0 65.5
1996-97 0.0 0.0 0.0 0.0 T T 1.7 4.1 5.5 1.6 0.0 0.0 12.9
1997-98 0.0 0.0 0.0 0.0 T 0.2 0.5 T 0.1 0.0 0.0 T 0.8
1998-99 0.0 0.0 0.0 0.0 0.0 2.0 4.9 0.7 4.9 0.0 0.0 0.0 12.5
1999-00 0.0 0.0 0.0 0.0 0.0 T 13.7 5.7 0.0 1.6 T 0.0 21.0
2000-01 0.0 0.0 0.0 0.0 0.0 10.5 3.8 10.0 1.8 T 0.0 0.0 26.1
2001- 0.0 0.0 0.0 0.0 0.0 0.0
POR= 58 YRS 0.0 0.0 0.0 0.0 0.7 3.1 6.0 6.4 3.4 0.3 T T 19.9



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