2001 BOSTON, MASSACHUSETTS (BOS)



Climate is the composite of numerous weather elements. Three important influences are responsible for the main features of the Boston climate. First, the latitude places the city in the zone of prevailing west to east atmospheric flow. Both polar and tropical air masses influence the region. Secondly, Boston is situated on or near several tracks frequently followed by low pressure storm systems. The weather fluctuates regularly from fair to cloudy to stormy conditions and assures an adequate amount of precipitation. The third factor is the east–coast location of Boston. The ocean has a moderating influence on temperature extremes of winter and summer.

Hot summer afternoons are frequently relieved by the locally celebrated sea breeze, as air flows inland from the cool water surface to displace the warm air over the land. This refreshing east wind is more commonly experienced along the shore than in the interior of the city or the western suburbs. In winter, under appropriate conditions, the severity of cold waves is reduced by the nearness of the relatively warm ocean. The average last occurrence of freezing temperature in spring is early April and the first occurrence of freezing temperature in autumn is early November. In suburban areas, especially away from the coast, these dates are later in spring and earlier in autumn by up to one month in the more susceptible localities.

Boston has no dry season. Most growing seasons have several shorter dry spells during which irrigation for high–value crops may be useful. Much of the rainfall from June to September comes from showers and thunderstorms. During the rest of the year, low pressure systems pass more or less regularly and produce precipitation on an average of roughly one day in three. Coastal storms, or northeasters, are prolific producers of rain and snow. The main snow season extends from December through March. Periods when the ground is bare or nearly bare of snow may occur at any time in the winter.

Relative humidity has been known to fall as low as 5 percent but such desert dryness is very rare. Heavy fog occurs on an average of about two days per month with its prevalence increasing eastward from the interior of Boston Bay to the open waters beyond.

Although winds of 30 mph or higher may be expected on at least one day in every month of the year, gales are both more common and more severe in winter.

NORMALS, MEANS, AND EXTREMES

BOSTON, MA (BOS)

LATITUDE:    LONGITUDE:     ELEVATION (FT):    TIME ZONE:    WBAN: 14739

42 21′ 38″ N  71 00′ 38″ W  GRND: 19  BARO: 180  EASTERN (UTC + 5)

2001 Boston, Massachusetts (BOS)

ELEMENT POR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC YEAR
TEMPERATURE F NORMAL DAILY MAXIMUM 30 35.7 37.5 45.8 55.9 66.6 76.3 81.8 79.8 72.8 62.7 52.2 40.4 59.0
MEAN DAILY MAXIMUM 56 36.6 38.3 45.5 56.1 66.8 76.8 81.8 79.9 72.5 62.7 52.0 40.9 59.2
HIGHEST DAILY MAXIMUM 50 66 70 89 94 95 100 102 102 100 90 79 76 102
YEAR OF OCCURRENCE 1995 1985 1998 1976 1979 1952 1977 1975 1953 1963 1994 1998 JUL 1977
MEAN OF EXTREME MAXS. 56 56.0 56.2 66.9 77.8 87.3 92.7 95.2 92.9 88.9 80.1 69.9 60.8 77.1
NORMAL DAILY MINIMUM 30 21.6 23.0 31.3 40.2 49.8 59.1 65.1 64.0 56.8 46.9 38.3 26.7 43.6
MEAN DAILY MINIMUM 56 22.0 23.6 31.2 40.3 49.8 59.3 65.2 64.0 56.7 47.0 38.1 27.2 43.7
LOWEST DAILY MINIMUM 50 -12 -4 6 16 34 45 50 47 38 28 15 -7 -12
YEAR OF OCCURRENCE 1957 1961 1984 1982 1956 1986 1988 1986 2000 1976 1989 1980 JAN 1957
MEAN OF EXTREME MINS. 56 3.4 6.1 15.4 29.6 40.3 49.4 57.1 54.7 44.2 34.6 24.3 9.5 30.7
NORMAL DRY BULB 30 28.6 30.3 38.6 48.1 58.2 67.7 73.5 71.9 64.8 54.8 45.3 33.6 51.3
MEAN DRY BULB 56 29.3 31.0 38.3 48.2 58.3 68.0 73.5 72.0 64.5 54.9 45.1 34.1 51.4
MEAN WET BULB 18 26.7 28.2 33.9 42.1 51.6 61.0 65.8 65.4 58.8 46.4 40.1 29.1 45.8
MEAN DEW POINT 18 18.8 19.7 24.6 34.7 43.3 55.8 61.3 61.3 54.5 40.9 33.4 21.5 39.1
NORMAL NO. DAYS WITH:
MAXIMUM 90 30 0.0 0.0 0.0 0.1 0.5 2.5 5.4 2.9 0.8 * 0.0 0.0 12.2
MAXIMUM 32 30 11.4 8.0 2.0 * 0.0 0.0 0.0 0.0 0.0 0.0 0.3 6.5 28.2
MINIMUM 32 30 26.1 23.5 16.8 2.7 0.0 0.0 0.0 0.0 0.0 0.6 7.0 22.3 99.0
MINIMUM 0 30 0.5 0.5 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.2 1.2
H/C NORMAL HEATING DEG. DAYS 30 1128 972 818 507 221 32 0 6 72 321 591 973 5641
NORMAL COOLING DEG. DAYS 30 0 0 0 0 10 113 264 220 66 5 0 0 678
RH NORMAL (PERCENT) 30 62 62 63 63 67 68 68 71 72 68 68 65 66
HOUR 01 LST 30 65 65 67 69 74 77 77 79 80 76 72 68 72
HOUR 07 LST 30 67 68 69 68 71 73 74 77 79 77 74 71 72
HOUR 13 LST 30 57 56 56 55 58 58 57 59 59 57 59 59 58
HOUR 19 LST 30 61 60 62 61 64 66 66 69 71 67 66 64 65
S PERCENT POSSIBLE SUNSHINE 61 53 56 57 56 58 63 65 65 63 60 50 52 58
W/O MEAN NO. DAYS WITH:
HEAVY FOG (VISBY 1/4 MI) 67 1.8 1.7 2.0 1.7 2.7 2.1 2.3 1.8 1.9 2.2 1.8 1.3 23.3
THUNDERSTORMS 67 0.2 0.1 0.6 1.0 2.3 3.4 4.2 3.4 1.7 0.7 0.4 0.2 18.2
CLOUDINESS MEAN:
SUNRISE-SUNSET (OKTAS) 61 5.0 5.0 5.1 5.3 5.3 5.0 4.9 4.5 4.4 4.4 5.0 5.0 4.9
MIDNIGHT-MIDNIGHT (OKTAS) 32 4.8 4.7 4.9 4.9 5.0 4.7 4.7 4.3 4.3 4.1 4.8 4.7 4.7
MEAN NO. DAYS WITH:
CLEAR 62 9.0 8.2 7.7 7.0 6.3 6.6 6.6 9.1 10.0 10.7 7.7 8.5 97.4
PARTLY CLOUDY 62 6.8 6.6 8.0 8.1 9.9 10.4 12.0 10.5 7.9 7.7 7.2 7.3 102.4
CLOUDY 62 15.2 13.4 15.3 14.9 14.8 12.9 11.9 10.9 11.6 12.1 14.7 14.9 162.6
PR MEAN STATION PRESSURE(IN) 29 29.98 30.00 29.99 29.90 29.90 29.90 29.90 29.99 29.98 30.00 29.98 29.99 29.96
MEAN SEA-LEVEL PRES. (IN) 18 30.03 30.03 30.01 29.97 29.97 29.95 29.97 30.02 30.06 30.08 30.06 30.04 30.02
WINDS MEAN SPEED (MPH) 53 13.7 13.8 14.0 13.5 12.2 11.6 11.0 10.8 11.3 11.9 12.9 13.5 12.5
PREVAIL. DIR (TENS OF DEGS) 34 30 29 29 30 20 20 23 24 24 24 29 30 30
MAXIMUM 2-MINUTE:
SPEED (MPH) 5 39 40 46 41 40 45 45 30 47 41 48 46 48
DIR. (TENS OF DEGS) 30 27 03 09 27 30 30 09 23 31 11 18 11
YEAR OF OCCURRENCE 2000 2001 1997 2000 2001 2000 1999 1997 1998 1999 1997 2000 NOV 1997
MAXIMUM 5-SECOND:
SPEED (MPH) 5 54 54 56 51 49 62 74 37 63 52 57 55 74
DIR. (TENS OF DEGS) 30 21 06 01 32 29 25 10 23 32 11 18 25
YEAR OF OCCURRENCE 2000 2000 2001 1997 2001 2000 1999 1997 1998 1999 1997 2000 JUL 1999
PRECIPITATION NORMAL (IN) 30 3.59 3.62 3.69 3.60 3.25 3.09 2.84 3.24 3.06 3.30 4.22 4.01 41.51
MAXIMUM MONTHLY (IN) 50 10.55 7.81 11.00 9.46 13.38 13.20 8.12 17.09 9.86 10.66 8.89 9.74 17.09
YEAR OF OCCURRENCE 1979 1984 1953 1987 1954 1982 1959 1955 1999 1996 1983 1969 AUG 1955
MINIMUM MONTHLY (IN) 50 0.61 0.72 0.62 0.83 0.53 0.48 0.52 0.82 0.35 0.41 0.64 0.81 0.35
YEAR OF OCCURRENCE 1989 1987 1981 1999 1964 1999 1952 1995 1957 1994 1976 1989 SEP 1957
MAXIMUM IN 24 HOURS (IN) 50 2.72 2.68 4.13 3.32 5.74 5.69 3.36 8.40 5.64 6.63 3.76 5.14 8.40
YEAR OF OCCURRENCE 1979 1969 1968 1991 1954 1998 1996 1955 1954 1996 1992 1992 AUG 1955
NORMAL NO. DAYS WITH:
PRECIPITATION 0.01 30 11.0 9.9 11.6 11.0 11.2 10.7 8.9 9.9 8.4 8.6 10.9 12.0 124.1
PRECIPITATION 1.00 30 0.9 1.2 0.8 1.0 0.7 0.6 0.7 0.7 0.7 0.7 1.2 0.9 10.1
SNOWFALL NORMAL (IN) 30 11.9 12.3 6.9 1.1 0.* 0.0 0.0 0.0 0.0 0.* 1.3 8.1 41.6
MAXIMUM MONTHLY (IN) 64 39.8 41.3 38.9 13.3 0.5 0.0 0.0 T 0.0 0.2 10.0 27.9 41.3
YEAR OF OCCURRENCE 1996 1969 1993 1982 1977 1994 1979 1938 1970 FEB 1969
MAXIMUM IN 24 HOURS (IN) 64 21.0 23.6 17.7 13.2 0.5 0.0 0.0 T 0.0 0.2 8.0 13.0 23.6
YEAR OF OCCURRENCE 1978 1978 1960 1982 1977 1994 1979 1987 1960 FEB 1978
MAXIMUM SNOW DEPTH (IN) 51 26 29 20 12 0 0 0 0 0 0 6 14 29
YEAR OF OCCURRENCE 1978 1978 1978 1982 1987 1975 FEB 1978
NORMAL NO. DAYS WITH:
SNOWFALL 1.0 30 2.9 2.7 2.1 0.3 0.0 0.0 0.0 0.0 0.0 0.0 0.5 2.5 11.0

2001 Boston, Massachusetts (BOS)

PRECIPITATION (inches) 2001 BOSTON, MA (BOS)
YEAR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANNUAL
1972 2.05 5.29 5.37 3.34 5.26 6.76 2.19 0.83 5.94 2.98 7.02 6.08 53.11
1973 3.12 2.13 2.20 5.65 3.76 4.68 4.83 2.78 1.95 2.71 1.74 7.20 42.75
1974 3.22 3.24 4.01 3.86 2.87 2.29 1.54 3.41 7.03 3.12 1.73 3.92 40.24
1975 5.70 3.37 2.74 2.40 1.78 2.10 2.35 5.52 5.49 4.41 5.13 4.80 45.79
1976 5.29 2.45 2.42 2.00 1.98 0.58 4.30 7.99 1.56 4.16 0.64 3.35 36.72
1977 4.41 2.40 4.76 4.07 3.52 2.49 2.21 2.91 4.03 4.63 2.54 6.20 44.17
1978 8.12 2.87 2.46 1.79 4.50 1.53 1.48 4.62 1.30 3.13 2.21 3.63 37.64
1979 10.55 3.46 3.03 3.19 4.24 0.86 2.36 5.02 3.61 3.14 3.29 1.42 44.17
1980 0.74 0.88 5.37 4.36 2.30 3.05 2.20 1.55 0.82 4.14 3.01 0.97 29.39
1981 0.95 6.65 0.62 3.14 1.17 1.65 3.47 1.04 2.54 3.43 4.78 6.27 35.71
1982 4.69 2.66 2.17 3.42 2.58 13.20 4.22 2.22 1.57 3.19 3.42 1.27 44.61
1983 5.03 5.00 9.72 6.86 2.94 1.07 1.07 3.28 1.06 3.74 8.89 4.94 53.60
1984 2.31 7.81 6.82 4.43 8.77 3.06 4.43 1.60 1.22 5.18 1.68 2.93 50.24
1985 1.12 1.83 2.29 1.62 3.36 3.94 3.51 6.67 3.00 1.65 6.39 1.21 36.59
1986 3.42 2.83 3.42 1.59 1.31 7.74 3.96 3.32 1.08 3.27 6.01 6.38 44.33
1987 7.28 0.72 4.27 9.46 1.75 2.62 0.82 2.93 7.29 2.73 3.49 2.12 45.48
1988 2.50 3.93 3.52 1.47 2.86 1.29 7.62 1.11 1.29 1.60 6.57 1.02 34.78
1989 0.61 2.51 3.07 3.58 3.54 2.84 5.09 5.92 4.61 5.71 4.13 0.81 42.42
1990 3.78 3.60 1.71 5.94 6.53 0.69 4.08 6.57 1.67 7.36 1.39 3.18 46.50
1991 3.24 1.58 4.33 4.84 0.92 2.89 1.95 5.27 6.32 4.27 4.06 2.58 42.25
1992 3.11 2.28 3.59 2.34 1.40 4.61 2.66 4.25 3.46 1.62 6.14 8.26 43.72
1993 2.17 4.94 7.67 4.86 1.04 1.75 1.75 1.32 4.64 3.61 2.86 6.60 43.21
1994 5.22 2.95 7.49 2.25 5.35 0.86 1.80 7.03 4.58 0.41 4.31 5.37 47.62
1995 4.33 2.57 2.20 1.40 1.82 1.55 2.06 0.82 3.60 6.42 5.13 3.20 35.10
1996 7.44 3.17 2.36 4.38 2.73 1.03 5.23 1.54 6.09 10.66 2.29 5.76 52.68
1997 2.34 1.28 4.68 3.46 2.63 1.41 0.63 3.01 1.02 1.78 5.86 2.29 30.39
1998 4.76 5.54 4.15 3.58 6.84 11.58 2.47 3.37 3.03 5.38 1.38 1.59 53.67
1999 5.69 3.51 2.52 0.83 2.70 T 3.51 1.33 9.86 4.30 2.14 1.52 37.91
2000 2.62 2.55 3.59 5.02 2.88 6.61 5.20 2.22 2.87 2.86 4.51 4.67 45.60
2001 1.58 1.37 7.57 0.88 1.23 4.99 2.13 4.14 2.29 0.98 0.73 2.83 30.72
POR=131 YRS 3.67 3.35 3.89 3.56 3.24 3.20 3.12 3.56 3.25 3.27 3.86 3.58 41.55

2001 Boston, Massachusetts (BOS)

AVERAGE TEMPERATURE (F) 2001 BOSTON, MA (BOS)
YEAR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANNUAL
1972 33.0 29.6 36.3 44.9 57.6 65.4 73.8 71.5 65.7 51.8 42.3 33.0 50.4
1973 31.4 30.1 43.3 49.9 57.0 70.0 74.3 74.8 64.4 55.6 45.8 39.6 53.0
1974 31.7 29.1 38.7 50.9 54.7 64.8 72.4 72.0 63.7 50.1 45.3 37.8 50.9
1975 34.9 32.1 36.9 45.1 61.5 67.5 75.9 72.9 63.9 57.3 51.8 34.4 52.9
1976 26.1 37.3 41.2 55.1 60.2 73.4 72.9 72.0 64.9 52.3 41.9 29.0 52.2
1977 23.3 30.7 44.7 51.3 62.6 67.4 74.9 73.4 64.4 55.3 48.1 34.2 52.5
1978 28.5 27.1 36.2 48.8 59.3 68.3 72.1 71.6 61.4 52.5 43.6 35.3 50.4
1979 32.5 23.1 42.5 48.7 61.1 68.2 74.5 71.7 64.9 52.7 48.6 36.7 52.1
1980 29.4 27.9 36.9 48.7 59.4 66.3 75.8 74.2 67.0 52.4 41.2 28.6 50.7
1981 21.4 36.4 39.1 51.7 60.4 70.7 74.6 72.1 63.7 51.2 43.9 33.2 51.5
1982 22.9 30.8 38.7 48.2 57.8 63.3 74.9 70.3 64.1 54.2 47.6 39.6 51.0
1983 31.2 32.8 40.6 49.1 58.2 70.7 78.0 73.6 70.6 55.2 46.1 32.1 53.2
1984 26.7 37.6 31.9 46.1 58.0 70.5 74.7 74.6 62.1 53.3 44.6 39.5 51.6
1985 24.4 32.8 40.4 49.3 59.3 64.8 73.5 70.4 65.4 55.4 45.4 31.3 51.0
1986 31.4 28.9 40.7 48.4 58.4 66.1 71.0 70.5 63.2 54.0 42.3 35.5 50.9
1987 28.9 29.1 38.5 45.1 57.2 65.1 71.7 70.3 65.4 54.3 43.9 36.1 50.5
1988 27.8 32.2 39.2 46.8 57.6 68.5 73.7 75.5 64.6 50.8 46.7 32.8 51.4
1989 34.5 30.5 37.3 45.9 59.4 67.8 72.8 71.6 64.7 55.3 42.8 21.7 50.4
1990 36.4 34.1 40.1 47.6 54.9 66.6 73.1 73.3 64.6 58.3 48.5 40.7 53.2
1991 29.4 36.1 41.6 51.3 63.3 70.0 74.6 73.8 63.7 56.4 45.2 36.0 53.5
1992 31.0 32.4 35.4 46.4 55.6 67.8 69.5 70.4 63.9 52.5 42.9 34.8 50.2
1993 32.4 27.1 36.4 48.3 60.3 69.5 74.7 73.6 64.8 52.3 45.6 34.2 51.6
1994 22.2 26.9 38.2 51.4 58.4 71.9 77.5 72.4 64.2 55.5 49.0 38.5 52.2
1995 34.6 28.5 38.8 46.1 57.2 68.6 75.9 72.8 63.1 58.4 41.9 31.7 51.5
1996 30.1 30.9 36.5 47.9 57.4 68.1 71.8 70.9 64.2 53.2 40.3 39.3 50.9
1997 29.2 36.0 36.7 46.3 56.1 68.2 73.7 71.2 64.2 52.8 41.7 35.2 50.9
1998 33.9 35.3 41.5 49.4 60.3 64.7 74.4 72.5 66.3 54.5 44.6 39.1 53.0
1999 29.5 33.6 39.4 49.2 58.2 71.0 75.7 71.3 67.1 53.0 48.0 37.3 52.8
2000 27.5 34.2 43.3 47.3 57.2 67.3 70.0 70.3 63.5 53.9 43.8 29.2 50.6
2001 30.0 31.8 35.3 48.7 59.6 71.1 69.9 73.9 65.3 56.2 48.3 40.5 52.6
POR=129 YRS 28.8 29.6 37.3 47.2 57.9 67.1 72.7 70.9 64.1 54.1 43.7 33.1 50.5

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 Boston, Massachusetts (BOS)

HEATING DEGREE DAYS (base 65 F) 2001 BOSTON, MA (BOS)
YEAR JUL AUG SEP OCT NOV DEC JAN FEB MAR APR MAY JUN TOTAL
1972-73 3 4 51 405 673 985 1033 971 666 450 258 24 5523
1973-74 0 2 94 289 570 782 1023 1000 809 429 335 77 5410
1974-75 0 2 102 458 587 836 925 918 866 590 162 59 5505
1975-76 0 8 70 239 395 941 1198 800 733 331 166 16 4897
1976-77 1 10 55 393 688 1108 1290 956 623 414 158 43 5739
1977-78 0 4 85 304 498 948 1127 1057 885 480 209 18 5615
1978-79 11 11 150 381 635 916 1002 1169 691 481 149 19 5615
1979-80 2 15 80 390 484 873 1096 1071 866 481 185 66 5609
1980-81 2 5 72 387 706 1120 1344 794 796 393 200 7 5826
1981-82 2 6 91 419 628 979 1300 948 811 496 231 113 6024
1982-83 2 19 71 338 515 783 1040 896 749 478 223 22 5136
1983-84 0 8 42 327 561 1012 1182 790 1020 563 239 36 5780
1984-85 3 0 142 359 605 781 1255 897 758 471 204 71 5546
1985-86 3 11 65 298 580 1035 1035 1008 746 490 258 66 5595
1986-87 21 16 98 344 674 904 1112 997 814 588 285 76 5929
1987-88 8 18 57 326 626 888 1145 945 792 541 253 61 5660
1988-89 9 10 64 443 541 992 938 959 853 565 196 51 5621
1989-90 2 4 88 294 660 1336 880 857 762 524 307 60 5774
1990-91 4 5 84 236 496 744 1096 803 721 407 126 35 4757
1991-92 1 8 111 273 586 894 1049 937 913 552 317 37 5678
1992-93 21 14 109 386 656 930 1002 1056 880 493 167 31 5745
1993-94 3 1 89 387 579 946 1320 1059 827 404 226 7 5848
1994-95 1 3 61 288 479 813 932 1016 804 561 258 30 5246
1995-96 1 2 113 214 685 1023 1074 981 875 510 260 20 5758
1996-97 1 6 80 358 739 792 1104 806 868 551 269 87 5661
1997-98 5 3 83 383 693 917 955 826 736 462 192 66 5321
1998-99 0 2 36 321 606 798 1092 872 790 468 215 29 5229
1999-00 2 7 39 363 505 851 1152 887 665 523 250 74 5318
2000-01 6 2 108 341 628 1103 1079 925 914 488 217 18 5829
2001- 2 1 67 286 492 753

2001 Boston, Massachusetts (BOS)

COOLING DEGREE DAYS (base 65 F) 2001 BOSTON, MA (BOS)
YEAR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANNUAL
1972 0 0 0 0 26 74 279 213 79 0 0 0 671
1973 0 0 0 7 18 180 296 316 84 3 0 0 904
1974 0 0 0 10 22 81 235 226 68 1 3 0 646
1975 0 0 0 0 60 139 345 261 44 9 4 0 862
1976 0 0 0 43 25 276 251 231 61 8 0 0 895
1977 0 0 1 13 92 124 314 272 75 6 0 0 897
1978 0 0 0 0 40 122 237 221 48 0 0 0 668
1979 0 0 0 0 35 122 304 226 85 17 0 0 789
1980 0 0 0 0 18 114 347 299 137 1 0 0 916
1981 0 0 0 0 67 185 306 232 60 0 0 0 850
1982 0 0 0 0 15 67 314 192 49 10 2 0 649
1983 0 0 0 7 18 200 410 283 217 27 0 0 1162
1984 0 0 0 3 31 207 312 306 62 3 0 0 924
1985 0 0 0 5 30 72 271 183 83 8 0 0 652
1986 0 0 0 0 60 105 211 190 55 10 0 0 631
1987 0 0 0 0 48 87 221 189 76 0 2 0 623
1988 0 0 0 0 31 173 287 342 59 11 0 0 903
1989 0 0 1 0 29 142 248 214 89 0 0 0 723
1990 0 0 0 10 2 116 261 268 77 34 8 0 776
1991 0 0 0 3 79 189 304 287 79 15 0 0 956
1992 0 0 0 0 30 126 165 189 83 5 0 0 598
1993 0 0 0 0 28 173 310 273 89 0 2 0 875
1994 0 0 0 1 29 221 395 241 44 1 4 0 936
1995 0 0 0 0 24 147 344 252 64 15 0 0 846
1996 0 0 0 3 30 120 222 196 63 0 1 0 635
1997 0 0 0 0 0 189 280 202 66 12 0 0 749
1998 0 0 16 2 52 59 298 240 83 1 0 0 751
1999 0 0 0 0 11 215 344 213 110 0 0 0 893
2000 0 0 0 0 15 151 167 174 71 5 0 0 583
2001 0 0 0 9 55 210 160 283 83 20 0 0 820

2001 Boston, Massachusetts (BOS)

SNOWFALL (inches) 2001 BOSTON, MA (BOS)
YEAR JUL AUG SEP OCT NOV DEC JAN FEB MAR APR MAY JUN TOTAL
1972-73 0.0 0.0 0.0 T 0.6 3.3 3.6 2.5 0.3 T 0.0 0.0 10.3
1973-74 0.0 0.0 0.0 0.0 0.0 T 16.0 17.8 0.1 3.0 0.0 0.0 36.9
1974-75 0.0 0.0 0.0 0.0 2.0 3.6 2.2 17.0 1.8 1.0 0.0 0.0 27.6
1975-76 0.0 0.0 0.0 T 0.1 19.3 15.0 1.4 10.8 T 0.0 0.0 46.6
1976-77 0.0 0.0 0.0 0.0 1.0 17.2 23.2 5.9 10.7 T 0.5 0.0 58.5
1977-78 0.0 0.0 0.0 0.0 0.7 5.2 35.9 27.2 16.1 T 0.0 0.0 85.1
1978-79 0.0 0.0 0.0 0.0 4.2 5.8 10.5 6.6 T 0.4 0.0 0.0 27.5
1979-80 0.0 0.0 0.0 0.2 T 2.0 0.4 6.5 3.6 T 0.0 0.0 12.7
1980-81 0.0 0.0 0.0 0.0 2.4 5.6 11.9 1.9 0.5 0.0 0.0 0.0 22.3
1981-82 0.0 0.0 0.0 0.0 T 17.6 18.0 7.6 5.3 13.3 0.0 0.0 61.8
1982-83 0.0 0.0 0.0 0.0 T 5.5 4.7 22.3 0.2 T 0.0 0.0 32.7
1983-84 0.0 0.0 0.0 0.0 T 2.6 21.1 0.3 19.0 T 0.0 0.0 43.0
1984-85 0.0 0.0 0.0 0.0 T 3.7 7.0 10.2 3.7 2.0 0.0 0.0 26.6
1985-86 0.0 0.0 0.0 0.0 3.0 1.3 0.8 10.4 2.6 T 0.0 0.0 18.1
1986-87 0.0 0.0 0.0 0.0 3.5 3.4 24.3 3.7 3.5 4.1 0.0 0.0 42.5
1987-88 0.0 0.0 0.0 0.0 9.0 7.5 17.0 14.1 5.0 T 0.0 0.0 52.6
1988-89 0.0 0.0 0.0 T 0.0 3.7 1.5 6.7 3.2 0.4 0.0 0.0 15.5
1989-90 0.0 0.0 0.0 0.0 4.5 6.2 7.0 16.9 4.1 0.5 0.0 0.0 39.2
1990-91 0.0 0.0 0.0 0.0 T 1.2 11.7 2.8 3.4 0.0 0.0 0.0 19.1
1991-92 0.0 0.0 0.0 0.0 T 5.8 0.4 4.0 10.8 1.0 0.0 0.0 22.0
1992-93 0.0 0.0 0.0 0.0 0.6 9.7 12.9 19.6 38.9 2.2 0.0 0.0 83.9
1993-94 0.0 0.0 0.0 0.0 T 11.6 33.7 36.2 14.8 0.0 0.0 0.0 96.3
1994-95 0.0 T 0.0 0.0 0.1 1.5 4.4 8.5 0.4 T 0.0 0.0 14.9
1995-96 0.0 0.0 0.0 0.0 4.1 24.1 39.8 15.5 16.8
1996-97 1.6
1997-98
1998-99 16.8 7.4 11.4 0.0 0.0 0.0
1999-00 0.0 0.0 0.0 0.0 0.0 0.0 13.7 9.2 2.0 T 0.0 0.0 24.9
2000-01 0.0 0.0 0.0 T T 4.5 12.4 9.8 19.2 T 0.0 0.0 45.9
2001- 0.0 0.0 0.0 T 0.0 5.0
POR=63 YRS 0.0 T 0.0 0.0 1.3 7.5 12.6 11.4 8.1 0.9 0.0 0.0 41.8



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