2001 DETROIT, METROPOLITAN AIRPORT MICHIGAN (DTW)



Detroit and the immediate suburbs, including nearby urban areas in Canada, occupy an area approximately 25 miles in radius. The waterway, consisting of the Detroit and St. Clair Rivers, Lake St. Clair, and the west end of Lake Erie, lies at an elevation of 568 to 580 feet above sea level. Nearly flat land slopes up gently from the waters edge northwestward for about 10 miles and then gives way to increasingly rolling terrain. The Irish Hills, parallel to and about 40 miles northwest of the waterway, have tops 1,000 to 1,250 feet above sea level. On the Canadian side of the waterway the land is relatively level.

Northwest winds in winter bring snow flurry accumulations to all of Michigan except in the Detroit Metropolitan area while summer showers moving from the northwest weaken and sometimes dissipate as they approach Detroit. On the other hand, much of the heaviest precipitation in winter comes from southeast winds, especially to the northwest suburbs of the city.

The climate of Detroit is influenced by its location with respect to major storm tracks and the influence of the Great Lakes. The normal wintertime storm track is south of the city, which brings on the average, about 3 inch snowfalls. Winter storms can bring combinations of rain, snow, freezing rain, and sleet with heavy snowfall accumulations possible at times. In summer, most storms pass to the north allowing for intervals of warm, humid, sunny skies with occasional thunderstorms followed by days of mild, dry, and fair weather. Temperatures of 90 degrees or higher are reached during each summer.

The most pronounced lake effect occurs in the winter when arctic air moving across the lakes is warmed and moistened. This produces an excess of cloudiness but a moderation of cold wave temperatures.

Local climatic variations are due largely to the immediate effect of Lake St. Clair and the urban heat island. On warm days in late spring or early summer, lake breezes often lower temperatures by 10 to 15 degrees in the eastern part of the city and the northeastern suburbs. The urban heat island effect shows up mainly at night where minimum temperatures at the Metropolitan Airport average 4 degrees lower than downtown Detroit. On humid summer nights or on very cold winter nights, this difference can exceed 10 degrees.

The growing season averages 180 days and has ranged from 145 days to 205 days. On average, the last freezing temperature occurs in late April while the average first freezing temperature occurs in late October. A freeze has occurred as late as mid–May and as early as late September.

Air pollution comes primarily from heavy industry spread along both shores of the waterway from Port Huron to Toledo. However, wind dispersion is usually sufficient to keep it from becoming a major hazard.

NORMALS, MEANS, AND EXTREMES

DETROIT, MI (DTW)

LATITUDE:    LONGITUDE:     ELEVATION (FT):    TIME ZONE:    WBAN: 94847

42 12′ 55″ N  83 20′ 55″ W  GRND: 628  BARO: 631  EASTERN (UTC + 5)

2001 Detroit, Metropolitan Airport Michigan (DTW)

ELEMENT POR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC YEAR
TEMPERATURE F NORMAL DAILY MAXIMUM 30 30.3 33.3 44.4 57.7 69.6 78.9 83.3 81.3 73.9 61.5 48.1 35.2 58.1
MEAN DAILY MAXIMUM 43 30.8 34.0 44.6 58.0 69.8 79.1 83.2 81.3 73.9 61.8 48.1 35.5 58.3
HIGHEST DAILY MAXIMUM 43 62 70 81 89 93 104 102 100 98 91 77 69 104
YEAR OF OCCURRENCE 1995 1999 1998 1977 1988 1988 1988 1988 1976 1963 1968 1998 JUN 1988
MEAN OF EXTREME MAXS. 43 49.6 52.6 69.2 79.0 86.1 92.0 93.5 91.9 88.8 79.7 67.2 55.4 75.4
NORMAL DAILY MINIMUM 30 15.6 17.6 27.0 36.8 47.1 56.3 61.3 59.6 52.5 40.9 32.2 21.4 39.0
MEAN DAILY MINIMUM 43 16.5 18.7 27.2 37.4 47.9 57.3 61.8 60.5 52.9 41.6 32.6 22.4 39.7
LOWEST DAILY MINIMUM 43 -21 -15 -4 10 25 36 41 38 29 17 9 -10 -21
YEAR OF OCCURRENCE 1984 1985 1978 1982 1966 1972 1965 1982 1974 1974 1969 1983 JAN 1984
MEAN OF EXTREME MINS. 43 -3.8 -.1 9.7 23.1 34.2 44.1 50.1 48.9 37.6 26.8 17.8 2.6 24.2
NORMAL DRY BULB 30 22.9 25.4 35.7 47.3 58.4 67.6 72.3 70.5 63.2 51.2 40.2 28.3 48.6
MEAN DRY BULB 43 23.6 26.4 35.8 47.7 58.9 68.1 72.4 71.0 63.5 51.7 40.2 29.1 49.0
MEAN WET BULB 18 23.8 26.1 32.6 42.6 53.2 62.0 66.0 65.2 57.8 47.3 37.4 28.2 45.2
MEAN DEW POINT 18 18.9 20.4 26.0 35.4 46.7 56.6 61.4 61.2 53.5 42.3 32.4 23.5 39.9
NORMAL NO. DAYS WITH:
MAXIMUM 90 30 0.0 0.0 0.0 0.0 0.4 2.7 5.3 2.7 0.7 0.1 0.0 0.0 11.9
MAXIMUM 32 30 17.1 13.2 4.1 0.2 0.0 0.0 0.0 0.0 0.0 0.0 1.3 11.7 47.6
MINIMUM 32 30 29.2 25.3 22.6 10.0 0.9 0.0 0.0 0.0 0.1 5.0 16.4 26.5 136.0
MINIMUM 0 30 3.8 2.2 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 1.4 7.5
H/C NORMAL HEATING DEG. DAYS 30 1305 1109 908 531 243 38 0 16 102 435 744 1138 6569
NORMAL COOLING DEG. DAYS 30 0 0 0 0 38 116 231 186 48 7 0 0 626
RH NORMAL (PERCENT) 30 75 73 70 66 65 67 68 72 73 72 75 77 71
HOUR 01 LST 30 78 77 76 74 76 79 81 83 84 80 79 80 79
HOUR 07 LST 30 80 79 79 78 78 79 82 86 87 84 82 81 81
HOUR 13 LST 30 69 65 61 54 53 54 54 56 58 57 66 71 60
HOUR 19 LST 30 73 70 66 59 56 58 58 63 68 68 73 76 66
S PERCENT POSSIBLE SUNSHINE 31 40 46 52 53 60 65 68 67 61 51 35 31 52
W/O MEAN NO. DAYS WITH:
HEAVY FOG (VISBY 1/4 MI) 44 2.5 2.4 2.3 0.9 0.8 0.7 0.6 1.3 1.6 2.0 1.7 3.1 19.9
THUNDERSTORMS 44 0.2 0.4 1.6 3.2 3.8 6.0 5.9 5.2 4.1 1.3 0.6 0.4 32.7
CLOUDINESS MEAN:
SUNRISE-SUNSET (OKTAS)
MIDNIGHT-MIDNIGHT (OKTAS)
MEAN NO. DAYS WITH:
CLEAR
PARTLY CLOUDY
CLOUDY
PR MEAN STATION PRESSURE(IN) 29 29.30 29.31 29.30 29.30 29.30 29.29 29.30 29.30 29.30 29.32 29.31 29.31 29.30
MEAN SEA-LEVEL PRES. (IN) 17 30.07 30.08 30.05 29.96 29.98 30.01 29.99 30.04 30.04 30.08 30.06 30.09 30.04
WINDS MEAN SPEED (MPH) 39 11.8 11.4 11.7 11.4 10.1 9.2 8.6 8.3 8.8 9.8 11.3 11.2 10.3
PREVAIL. DIR (TENS OF DEGS) 34 24 23 29 23 23 23 22 23 23 23 24 23 23
MAXIMUM 2-MINUTE:
SPEED (MPH) 6 44 51 46 47 43 32 53 35 35 47 45 49 53
DIR. (TENS OF DEGS) 22 22 21 22 22 27 28 29 27 24 24 29 28
YEAR OF OCCURRENCE 1996 1997 1996 2001 1999 1998 1998 2001 2001 1996 1998 1998 JUL 1998
MAXIMUM 5-SECOND:
SPEED (MPH) 6 53 60 53 57 55 41 67 41 45 56 58 60 67
DIR. (TENS OF DEGS) 24 24 24 24 25 27 28 29 28 24 25 31 28
YEAR OF OCCURRENCE 1996 2001 1996 1997 2000 1998 1998 2001 1997 1996 1998 1998 JUL 1998
PRECIPITATION NORMAL (IN) 30 1.76 1.74 2.55 2.95 2.92 3.61 3.18 3.43 2.89 2.10 2.67 2.82 32.62
MAXIMUM MONTHLY (IN) 43 3.92 5.02 4.48 5.40 6.20 7.04 6.02 7.83 7.52 6.76 5.68 6.00 7.83
YEAR OF OCCURRENCE 1993 1990 1973 1961 1991 1987 1969 1975 1986 2001 1982 1965 AUG 1975
MINIMUM MONTHLY (IN) 43 0.27 0.15 0.82 0.92 0.87 0.97 0.59 0.43 0.43 0.35 0.79 0.46 0.15
YEAR OF OCCURRENCE 1961 1969 1981 1971 1988 1988 1974 1996 1960 1964 1976 1960 FEB 1969
MAXIMUM IN 24 HOURS (IN) 43 1.72 2.41 1.82 3.58 2.87 2.84 4.34 3.21 4.08 2.57 2.20 3.71 4.34
YEAR OF OCCURRENCE 1967 1998 1997 2000 1968 1983 1998 1964 2000 1985 1982 1965 JUL 1998
NORMAL NO. DAYS WITH:
PRECIPITATION 0.01 30 13.0 11.0 13.2 12.3 11.0 10.5 9.2 9.3 9.8 9.6 11.6 14.1 134.6
PRECIPITATION 1.00 30 0.1 0.2 0.2 0.4 0.6 0.9 0.9 1.0 0.5 0.4 0.3 0.4 5.9
SNOWFALL NORMAL (IN) 30 10.0 9.2 6.6 1.8 T 0.0 0.0 0.0 0.0 0.2 3.0 10.9 41.7
MAXIMUM MONTHLY (IN) 42 29.6 20.8 16.1 9.0 T 0.0 0.0 0.0 T 2.9 11.8 34.9 34.9
YEAR OF OCCURRENCE 1978 1986 1965 1982 1994 1994 1980 1966 1974 DEC 1974
MAXIMUM IN 24 HOURS (IN) 42 11.1 10.3 9.2 7.4 T 0.0 0.0 0.0 T 2.9 5.6 19.2 19.2
YEAR OF OCCURRENCE 1992 1965 1973 1982 1994 1994 1980 1977 1974 DEC 1974
MAXIMUM SNOW DEPTH (IN) 41 24 18 9 6 0 0 0 0 0 1 6 19 24
YEAR OF OCCURRENCE 1999 1982 1982 1982 1980 1966 1974 JAN 1999
NORMAL NO. DAYS WITH:
SNOWFALL 1.0 30 3.1 3.1 2.1 0.6 0.0 0.0 0.0 0.0 0.0 0.1 1.1 3.3 13.4

2001 Detroit, Metropolitan Airport Michigan (DTW)

PRECIPITATION (inches) 2001 DETROIT, METROPOLITAN AIRPORT MI (DTW)
YEAR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANNUAL
1972 1.28 1.00 2.55 3.63 2.68 3.30 2.21 3.07 3.40 2.24 3.19 3.11 31.66
1973 1.65 1.08 4.48 1.42 3.72 4.86 4.66 1.67 1.82 2.01 3.21 3.51 34.09
1974 3.26 2.37 4.20 2.75 3.49 2.38 0.59 2.95 2.22 0.81 2.86 4.00 31.88
1975 2.90 2.65 1.66 2.50 2.82 2.39 1.98 7.83 3.18 1.29 2.39 3.00 34.59
1976 1.91 2.87 4.24 3.15 3.26 3.26 1.47 1.68 3.66 2.01 0.79 0.79 29.09
1977 0.98 1.64 3.57 4.17 2.40 3.16 3.28 2.23 4.23 1.37 2.88 2.97 32.88
1978 3.16 0.45 2.05 2.49 3.58 2.69 1.97 1.73 1.82 2.49 2.41 2.81 27.65
1979 1.52 0.57 2.44 4.97 2.82 4.04 4.96 2.99 0.94 1.24 4.19 2.36 33.04
1980 0.69 1.00 3.88 4.23 3.22 6.42 4.33 6.09 2.94 1.26 0.88 2.30 37.24
1981 0.57 3.13 0.82 3.44 2.60 3.33 4.29 2.32 5.47 3.92 1.26 2.38 33.53
1982 3.43 1.10 3.14 1.60 2.83 4.11 4.78 0.72 2.55 1.01 5.68 3.29 34.24
1983 0.84 0.89 1.87 4.20 5.47 4.88 4.53 1.57 2.49 2.85 4.28 3.78 37.65
1984 0.78 1.31 3.12 2.48 3.62 1.04 0.95 3.00 2.30 2.28 2.49 2.90 26.27
1985 2.63 3.83 4.42 2.11 3.11 1.62 3.96 4.88 2.59 3.91 5.51 1.51 40.08
1986 1.30 3.46 2.29 2.73 1.36 5.75 2.47 3.52 7.52 3.05 1.88 2.28 37.61
1987 2.35 0.53 2.19 2.14 2.50 7.04 2.20 6.87 2.69 2.00 3.17 4.60 38.28
1988 1.30 2.02 1.16 1.50 0.87 0.97 2.43 3.13 3.65 3.57 4.29 1.97 26.86
1989 1.28 0.77 2.16 2.22 4.16 3.79 4.21 2.14 3.03 1.73 2.53 1.24 29.26
1990 1.80 5.02 1.91 2.72 3.74 4.92 1.47 3.85 6.06 4.14 2.64 4.37 42.64
1991 1.44 0.94 1.41 2.66 6.20 1.89 1.23 4.31 0.90 4.14 2.61 1.91 29.64
1992 1.78 1.54 3.34 4.34 1.33 2.35 5.91 2.50 5.55 2.01 4.33 2.35 37.33
1993 3.92 1.27 2.12 3.32 1.24 6.05 2.17 1.60 4.26 2.21 1.69 0.78 30.63
1994 2.79 1.38 2.29 4.04 1.18 3.97 3.20 3.30 2.38 1.35 2.74 2.39 31.01
1995 2.47 0.89 1.73 3.44 3.55 1.55 3.40 3.71 0.62 3.53 3.08 0.85 28.82
1996 1.85 1.76 1.56 3.39 2.82 2.37 2.64 0.43 4.42 1.59 1.99 2.57 27.39
1997 1.57 3.90 3.22 1.56 5.23 3.17 2.68 3.22 3.41 1.91 0.94 1.61 32.42
1998 2.60 3.56 3.62 3.86 2.46 2.69 5.72 4.19 1.50 1.41 1.36 1.16 34.13
1999 3.00 1.98 1.12 5.13 2.20 5.46 3.62 1.31 3.11 1.56 1.49 2.22 32.20
2000 1.29 0.84 1.55 4.35 5.11 4.90 5.40 4.63 6.71 3.05 1.69 2.63 42.15
2001 0.69 2.88 0.93 3.20 3.70 3.40 1.16 2.87 4.28 6.76 2.35 2.23 34.45
POR=43 YRS 1.92 1.81 2.40 3.13 3.00 3.61 3.18 3.23 2.97 2.28 2.48 2.53 32.54

2001 Detroit, Metropolitan Airport Michigan (DTW)

AVERAGE TEMPERATURE (F) 2001 DETROIT, METROPOLITAN AIRPORT MI (DTW)
YEAR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANNUAL
1972 23.8 24.6 32.6 44.6 60.3 64.2 71.2 69.1 63.0 47.3 37.4 29.4 47.3
1973 28.8 25.3 43.3 48.8 55.5 69.9 72.6 72.9 64.9 56.2 41.4 28.7 50.7
1974 26.5 23.6 35.7 49.2 55.2 65.9 72.5 72.3 59.7 48.8 40.6 28.6 48.2
1975 28.3 27.5 32.5 40.9 62.8 69.0 72.2 72.3 59.1 52.9 46.8 29.1 49.5
1976 19.2 33.3 40.4 50.0 56.4 70.6 72.7 70.2 62.1 47.4 33.5 21.5 48.1
1977 12.8 25.2 41.5 52.4 64.4 65.5 75.8 70.6 65.1 47.9 40.5 25.5 48.9
1978 19.6 16.3 30.0 45.5 59.3 66.8 70.6 71.9 67.5 50.2 40.5 28.9 47.3
1979 18.6 16.5 37.7 44.6 56.5 66.6 70.4 67.9 62.6 50.1 39.5 31.9 46.9
1980 24.5 22.2 31.3 45.9 59.8 63.7 72.7 72.7 63.8 46.3 37.4 26.0 47.2
1981 19.0 28.8 36.5 49.8 55.9 68.0 72.4 70.0 60.9 47.6 41.1 27.8 48.2
1982 17.1 20.7 33.0 43.2 64.3 64.2 72.4 67.7 61.8 52.6 41.6 37.3 48.0
1983 28.7 31.6 38.4 44.2 54.4 68.2 74.5 73.6 64.0 51.6 41.2 20.8 49.3
1984 18.0 33.3 28.9 47.8 54.5 70.8 70.8 72.7 61.2 54.9 38.6 34.0 48.8
1985 20.4 23.5 38.4 51.0 60.1 62.8 71.3 69.2 64.3 53.0 42.4 22.2 48.2
1986 23.9 24.6 37.6 50.6 61.3 67.3 75.0 68.9 65.9 52.6 37.3 31.7 49.7
1987 26.1 29.6 39.8 50.8 63.3 71.3 76.1 71.6 64.6 46.6 43.5 33.6 51.4
1988 23.8 23.4 36.9 48.5 62.0 70.4 77.1 75.1 63.3 46.0 42.2 28.7 49.8
1989 32.8 24.1 35.2 45.1 57.5 67.5 73.0 69.9 61.9 52.1 38.2 18.0 47.9
1990 33.6 30.7 39.5 49.0 56.6 68.5 72.2 71.2 64.5 52.8 44.2 32.8 51.3
1991 25.0 31.2 40.3 52.0 66.5 72.4 74.9 73.4 63.1 54.8 38.5 32.1 52.0
1992 28.3 30.8 35.5 46.3 58.3 65.5 68.8 66.7 61.4 49.7 40.5 33.2 48.8
1993 29.4 24.2 34.7 47.8 60.2 67.5 75.5 74.5 61.0 51.9 41.2 30.8 49.9
1994 17.3 23.5 37.1 51.2 58.7 72.3 74.2 69.6 66.2 53.8 45.5 35.4 50.4
1995 28.4 24.9 39.2 45.7 59.7 71.6 74.8 77.2 62.8 55.1 35.5 25.6 50.0
1996 24.3 26.0 30.8 45.2 56.7 70.7 70.6 72.9 64.1 52.0 34.3 31.5 48.3
1997 23.0 30.6 37.2 45.8 52.0 69.5 72.2 68.1 62.7 51.8 37.1 32.2 48.5
1998 32.8 36.7 39.5 50.4 65.6 69.1 73.4 73.2 68.0 53.8 43.8 35.3 53.5
1999 23.1 32.8 34.8 50.7 62.4 70.8 76.8 70.2 65.5 51.6 45.2 32.0 51.3
2000 24.6 31.9 44.0 48.0 61.8 69.4 70.3 70.8 62.5 55.1 40.2 19.3 49.8
2001 26.2 29.7 35.1 51.2 61.2 69.6 73.6 74.1 62.3 52.5 47.6 35.9 51.6
POR=43 YRS 23.6 26.5 35.8 47.8 59.0 67.9 72.5 71.0 63.5 51.6 40.2 29.2 49.1

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 OBSTRUCTIONSS 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 Detroit, Metropolitan Airport Michigan (DTW)

HEATING DEGREE DAYS (base 65 F) 2001 DETROIT, METROPOLITAN AIRPORT MI (DTW)
YEAR JUL AUG SEP OCT NOV DEC JAN FEB MAR APR MAY JUN TOTAL
1972-73 24 28 113 539 822 1096 1115 1103 667 480 289 3 6279
1973-74 0 10 98 276 702 1119 1189 1152 901 476 308 54 6285
1974-75 0 2 189 495 726 1123 1129 1043 996 714 142 41 6600
1975-76 4 0 178 375 537 1107 1413 914 757 473 269 6 6033
1976-77 1 15 133 540 938 1341 1609 1106 721 395 122 85 7006
1977-78 1 17 85 524 729 1218 1400 1357 1077 580 235 65 7288
1978-79 17 0 73 452 728 1112 1432 1355 843 604 291 55 6962
1979-80 12 29 126 471 758 1019 1249 1233 1036 568 191 104 6796
1980-81 0 0 110 578 822 1201 1418 1008 878 452 293 19 6779
1981-82 3 9 167 534 710 1144 1477 1237 985 647 75 70 7058
1982-83 2 39 145 383 696 852 1119 928 816 618 323 59 5980
1983-84 6 0 125 418 708 1367 1450 912 1112 507 334 9 6948
1984-85 11 4 164 310 785 955 1377 1154 818 435 177 93 6283
1985-86 2 8 129 366 672 1317 1271 1125 842 435 166 48 6381
1986-87 1 33 76 380 824 1028 1198 984 776 423 158 11 5892
1987-88 4 30 69 566 639 969 1273 1201 864 486 138 46 6285
1988-89 2 3 90 590 679 1118 991 1138 916 591 254 33 6405
1989-90 0 11 151 400 797 1451 966 955 785 506 258 27 6307
1990-91 1 1 112 380 618 994 1234 939 761 394 125 5 5564
1991-92 0 0 151 319 788 1013 1129 985 906 555 224 59 6129
1992-93 15 30 153 469 725 976 1097 1138 931 506 161 51 6252
1993-94 0 2 155 404 710 1050 1472 1156 858 433 238 24 6502
1994-95 0 9 55 345 579 910 1129 1115 793 573 170 17 5695
1995-96 2 0 125 306 877 1215 1253 1122 1055 589 289 8 6841
1996-97 3 0 102 397 915 1033 1297 959 855 566 394 25 6546
1997-98 3 13 103 435 830 1008 991 787 791 431 69 80 5541
1998-99 0 2 44 350 629 914 1293 898 927 424 115 33 5629
1999-00 0 3 81 413 585 1016 1246 958 645 504 159 31 5641
2000-01 1 13 148 307 737 1412 1194 983 920 415 146 45 6321
2001- 9 0 131 382 514 898

2001 Detroit, Metropolitan Airport Michigan (DTW)

COOLING DEGREE DAYS (base 65 F) 2001 DETROIT, METROPOLITAN AIRPORT MI (DTW
YEAR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANNUAL
1972 0 0 0 0 36 73 222 160 59 0 0 0 550
1973 0 0 0 3 2 156 241 261 104 11 0 0 778
1974 0 0 0 8 10 91 237 237 36 1 0 0 620
1975 0 0 0 0 82 171 233 232 7 6 0 0 731
1976 0 0 0 30 10 182 246 182 53 3 0 0 706
1977 0 0 0 25 108 107 341 198 94 0 0 0 873
1978 0 0 0 0 63 122 200 221 154 0 0 0 760
1979 0 0 0 0 32 109 184 124 57 16 0 0 522
1980 0 0 0 3 38 69 246 248 79 3 0 0 686
1981 0 0 0 1 17 118 241 168 51 0 0 0 596
1982 0 0 0 0 58 55 237 129 57 5 0 0 541
1983 0 0 0 2 0 160 306 272 104 6 0 0 850
1984 0 0 0 0 15 189 197 252 55 2 0 0 710
1985 0 0 0 25 32 32 201 146 116 0 0 0 552
1986 0 0 0 10 55 120 319 160 110 3 0 0 777
1987 0 0 0 4 111 207 355 245 64 0 1 0 987
1988 0 0 0 0 52 214 385 322 46 8 0 0 1027
1989 0 0 0 0 29 114 256 171 64 5 0 0 639
1990 0 0 1 32 8 139 234 200 101 11 0 0 726
1991 0 0 0 10 179 233 315 268 104 9 0 0 1118
1992 0 0 0 0 27 80 143 91 51 0 0 0 392
1993 0 0 0 0 21 135 334 302 41 5 0 0 838
1994 0 0 0 24 49 248 290 160 97 2 0 0 870
1995 0 0 0 0 11 222 312 383 67 7 0 0 1002
1996 0 0 0 2 37 185 184 251 82 0 0 0 741
1997 0 0 0 0 0 165 231 114 40 29 0 0 579
1998 0 0 7 0 95 209 268 261 136 9 0 0 985
1999 0 0 0 0 43 213 372 171 104 2 0 0 905
2000 0 0 3 0 66 172 170 199 78 4 0 0 692
2001 0 0 0 6 36 190 279 290 58 4 0 0 863

2001 Detroit, Metropolitan Airport Michigan (DTW)

SNOWFALL (inches) 2001 DETROIT, METROPOLITAN AIRPORT MI (DTW)
YEAR JUL AUG SEP OCT NOV DEC JAN FEB MAR APR MAY JUN TOTAL
1972-73 0.0 0.0 0.0 T 7.1 12.5 2.4 12.8 10.1 0.1 T 0.0 45.0
1973-74 0.0 0.0 0.0 0.0 0.1 16.4 14.1 11.2 5.7 1.7 T 0.0 49.2
1974-75 0.0 0.0 0.0 T 7.7 34.9 4.9 7.5 4.5 3.6 0.0 0.0 63.1
1975-76 0.0 0.0 0.0 0.0 6.5 19.8 15.1 4.9 7.5 2.1 T 0.0 55.9
1976-77 0.0 0.0 0.0 T 1.4 9.8 14.7 5.0 12.3 0.7 0.0 0.0 43.9
1977-78 0.0 0.0 0.0 0.0 7.4 16.6 29.6 5.3 2.5 0.3 0.0 0.0 61.7
1978-79 0.0 0.0 0.0 0.0 6.1 6.6 13.3 3.9 2.7 3.0 0.0 0.0 35.6
1979-80 0.0 0.0 0.0 T 3.2 2.3 2.8 5.5 11.7 1.4 0.0 0.0 26.9
1980-81 0.0 0.0 0.0 2.9 3.4 10.5 7.6 13.4 0.6 0.0 0.0 0.0 38.4
1981-82 0.0 0.0 0.0 0.1 0.7 17.3 20.0 13.3 13.6 9.0 0.0 0.0 74.0
1982-83 0.0 0.0 0.0 T 1.8 1.4 1.5 4.3 7.6 3.4 0.0 0.0 20.0
1983-84 0.0 0.0 0.0 0.0 3.5 19.9 9.9 8.7 9.7 0.1 0.0 0.0 51.8
1984-85 0.0 0.0 0.0 0.0 4.1 6.2 20.9 16.9 6.1 0.9 0.0 0.0 55.1
1985-86 0.0 0.0 0.0 0.0 2.0 14.1 8.6 20.8 7.4 1.3 0.0 0.0 54.2
1986-87 0.0 0.0 0.0 T 3.3 6.0 24.0 2.0 13.3 1.1 0.0 0.0 49.7
1987-88 0.0 0.0 0.0 T 0.7 15.3 7.0 19.2 2.7 0.2 0.0 0.0 45.1
1988-89 0.0 0.0 0.0 T 1.0 6.3 5.3 9.6 2.4 0.5 T 0.0 25.1
1989-90 0.0 0.0 0.0 2.7 2.4 11.8 4.0 11.1 7.8 2.0 0.0 0.0 41.8
1990-91 0.0 0.0 T 0.0 T 13.2 8.8 9.2 0.2 T T 0.0 31.4
1991-92 0.0 0.0 0.0 T 2.2 8.6 18.4 2.4 11.7 0.2 0.0 0.0 43.5
1992-93 0.0 0.0 0.0 0.4 0.9 5.0 11.0 15.2 15.7 4.0 0.0 0.0 52.2
1993-94 0.0 0.0 0.0 0.4 0.6 1.9 17.9 17.1 3.7 4.2 T 0.0 45.8
1994-95 0.0 0.0 T 0.0 T 9.6 13.1 5.7 3.5 1.6 0.0 0.0 33.5
1995-96 0.0 0.0 0.0 0.0 1.3 4.5 6.3 11.8
1996-97
1997-98 4.6 6.0 8.3 T 4.4 0.0 T 0.0
1998-99 0.0 0.0 T 0.0 0.0 1.2 27.3 7.8 13.2 0.0 0.0 0.0 49.5
1999-00 0.0 0.0 0.0 T T 4.0 9.6 8.1 1.1 0.6 T 0.0 23.4
2000-01 0.0 0.0 0.0 T 1.3 25.1 3.4 2.9 5.4 0.9 0.0 0.0 39.0
2001- 0.0 0.0 0.0 T 0.0 4.9
POR=41 YRS 0.0 0.0 T 0.2 2.6 9.9 10.3 8.7 6.7 1.7 T 0.0 40.1



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