2001 GRAND RAPIDS, MICHIGAN (GRR)



Grand Rapids, Michigan, is located in the west–central part of Kent County, in the picturesque Grand River valley about 30 air miles east of Lake Michigan. The Grand River, the longest stream in Michigan, flows through the city and bisects it into east and west sections. High hills rise on either side of the valley. Elevations range from 602 feet on the valley floor to 1,020 feet in the extreme southern part of Kent County, southwest of the airport.

Grand Rapids is under the natural climatic influence of Lake Michigan. In spring the cooling effect of Lake Michigan helps retard the growth of vegetation until the danger of frost has passed. The warming effect in the fall retards frost until most of the crops have matured. Fall is a colorful time of year in western Michigan, compensating for the late spring. During the winter, excessive cloudiness and numerous snow flurries occur with strong westerly winds. The tempering effect of Lake Michigan on cold waves coming in from the west and northwest is quite evident.

The tempering effect of the lake promotes the growth of a great variety of fruit trees and berries, especially apples, peaches, cherries, and blueberries. The intense cold of winter is modified, thus reducing winter kill of fruit trees. Summer days are pleasantly warm and most summer nights are quite comfortable, although there are about three weeks of hot, humid weather during most summers. Prolonged severe cold waves with below–zero temperatures are infrequent. The temperature usually rises to above zero during the daytime hours regardless of early morning readings.

July is the sunniest month and December is the month with the least sunshine. November through January is usually a period of excessive cloudiness and minimal sunshine.

Precipitation is usually ample for the growth and development of all vegetation. About one–half of the annual precipitation falls during the growing season, May through September. Droughts occur occasionally, but are seldom of protracted length. The snowfall season extends from mid–November to mid–March. Some winters have had continuous snow cover throughout this period, although there is usually a mid–winter thaw. The Grand River flows through the city and reaches critical heights a couple of times each year, generally once in January–February and again in March–April. Overflow is generally limited to the lowlands of the flood plain.

November is one of the windiest months and although violent windstorms are infrequent, gusts have on occasion exceeded 65 mph. Summer thunderstorms occasionally produce gusty winds over 60 mph.

NORMALS, MEANS, AND EXTREMES

GRAND RAPIDS, MI (GRR)

LATITUDE:    LONGITUDE:     ELEVATION (FT):    TIME ZONE:    WBAN: 94860

42 52′ 56″ N  85 31′ 23″ W  GRND: 785  BARO: 788  EASTERN (UTC + 5)

2001 Grand Rapids, Michigan (GRR)

ELEMENT POR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC YEAR
TEMPERATURE F NORMAL DAILY MAXIMUM 30 29.0 31.6 42.8 56.6 69.3 78.7 82.8 80.5 72.0 59.8 45.8 33.5 56.9
MEAN DAILY MAXIMUM 54 29.7 32.5 42.3 56.8 69.3 78.6 82.5 80.4 72.5 60.9 46.1 34.1 57.1
HIGHEST DAILY MAXIMUM 38 62 69 78 88 92 98 100 100 93 87 77 69 100
YEAR OF OCCURRENCE 1967 1999 2000 1970 1978 1995 1988 1964 1973 1975 1975 2001 JUL 1988
MEAN OF EXTREME MAXS. 54 47.7 50.0 67.0 78.4 85.4 91.4 92.5 89.7 87.5 78.8 66.5 53.2 74.0
NORMAL DAILY MINIMUM 30 14.7 15.8 25.4 35.4 45.6 55.3 60.4 58.4 49.9 39.1 30.2 20.7 37.6
MEAN DAILY MINIMUM 54 15.8 17.1 25.1 35.9 46.2 55.9 60.4 59.0 50.9 40.8 31.3 21.3 38.3
LOWEST DAILY MINIMUM 38 -22 -19 -8 3 22 33 41 39 27 18 5 -18 -22
YEAR OF OCCURRENCE 1994 1973 1978 1982 1966 1972 1983 1976 1991 1988 1977 1983 JAN 1994
MEAN OF EXTREME MINS. 54 -6.1 -3.8 5.6 20.7 31.1 41.1 47.6 45.2 34.8 26.2 15.9 0.9 21.6
NORMAL DRY BULB 30 21.8 23.7 34.1 46.0 57.5 67.0 71.6 69.5 61.0 49.5 38.0 27.1 47.2
MEAN DRY BULB 54 22.8 24.8 33.7 46.3 57.7 67.2 71.4 69.7 61.8 50.8 38.8 27.7 47.7
MEAN WET BULB 17 22.7 24.5 31.3 41.6 52.1 60.9 64.9 64.1 56.6 43.5 35.9 26.9 43.8
MEAN DEW POINT 17 18.9 20.0 25.4 34.8 45.9 55.8 60.9 60.7 52.9 39.5 31.7 23.3 39.2
NORMAL NO. DAYS WITH:
MAXIMUM 90 30 0.0 0.0 0.0 0.0 0.5 2.3 5.1 2.6 0.4 0.0 0.0 0.0 10.9
MAXIMUM 32 30 19.3 15.3 5.8 0.4 0.0 0.0 0.0 0.0 0.0 0.0 2.3 14.3 57.4
MINIMUM 32 30 29.4 26.1 23.9 11.9 2.2 0.0 0.0 0.0 0.3 6.1 17.3 27.9 145.1
MINIMUM 0 30 4.1 3.0 0.5 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 1.6 9.2
H/C NORMAL HEATING DEG. DAYS 30 1339 1156 958 570 273 50 0 18 139 485 810 1175 6973
NORMAL COOLING DEG. DAYS 30 0 0 0 0 40 110 208 157 19 0 0 0 534
RH NORMAL (PERCENT) 30 77 74 71 67 65 68 70 73 76 75 77 80 73
HOUR 01 LST 30 80 78 76 74 76 80 82 86 86 82 81 82 80
HOUR 07 LST 30 81 80 80 79 79 81 84 88 89 85 83 83 83
HOUR 13 LST 30 72 67 63 56 53 55 56 58 61 62 69 75 62
HOUR 19 LST 30 76 72 66 59 55 57 57 62 71 72 76 79 67
S PERCENT POSSIBLE SUNSHINE 36 28 39 46 51 56 61 64 61 54 44 27 23 46
W/O MEAN NO. DAYS WITH:
HEAVY FOG (VISBY 1/4 MI) 39 2.3 2.2 2.5 1.7 1.5 1.5 1.4 1.9 2.0 1.9 2.1 3.3 24.3
THUNDERSTORMS 39 0.2 0.2 1.6 3.4 3.7 5.5 5.8 5.0 4.1 1.7 1.2 0.4 32.8
CLOUDINESS MEAN:
SUNRISE-SUNSET (OKTAS)
MIDNIGHT-MIDNIGHT (OKTAS)
MEAN NO. DAYS WITH:
CLEAR 1 1.0
PARTLY CLOUDY 1 1.0 2.0
CLOUDY 1 1.0 1.0
PR MEAN STATION PRESSURE(IN) 28 29.20 29.20 29.11 29.10 29.10 29.10 29.10 29.20 29.20 29.21 29.20 29.19 29.16
MEAN SEA-LEVEL PRES. (IN) 15 30.06 30.06 30.05 29.95 29.97 30.01 29.98 30.03 30.04 30.07 30.04 30.07 30.03
WINDS MEAN SPEED (MPH) 26 11.4 10.6 11.2 11.0 9.7 8.8 8.4 7.8 8.1 9.3 10.5 10.5 9.8
PREVAIL. DIR (TENS OF DEGS) 27 25 24 25 25 25 24 24 24 18 18 24 20 24
MAXIMUM 2-MINUTE:
SPEED (MPH) 6 45 55 43 52 47 38 51 32 39 47 49 38 55
DIR. (TENS OF DEGS) 24 24 24 19 26 27 26 27 25 24 23 24 24
YEAR OF OCCURRENCE 1996 1999 1999 1999 1998 2000 1999 2000 1997 1996 1998 2001 FEB 1999
MAXIMUM 5-SECOND:
SPEED (MPH) 6 55 64 54 61 60 52 58 38 48 60 66 47 66
DIR. (TENS OF DEGS) 24 25 23 25 27 22 29 27 25 25 23 24 23
YEAR OF OCCURRENCE 1996 1999 1996 1997 1998 1998 1999 2000 1997 1996 1998 2001 NOV 1998
PRECIPITATION NORMAL (IN) 30 1.83 1.42 2.63 3.37 3.13 3.68 3.19 3.57 4.24 2.81 3.32 2.85 36.04
MAXIMUM MONTHLY (IN) 38 4.36 4.80 5.12 6.69 10.01 8.21 8.83 8.46 11.85 7.38 7.81 6.63 11.85
YEAR OF OCCURRENCE 1975 1997 1974 1999 2001 1967 1992 1987 1986 2001 1966 1971 SEP 1986
MINIMUM MONTHLY (IN) 38 0.47 0.33 0.54 1.70 0.94 0.25 0.81 0.14 T 0.60 0.95 T T
YEAR OF OCCURRENCE 1981 1969 2001 1997 1987 1988 1976 1969 1979 1964 1986 1952 SEP 1979
MAXIMUM IN 24 HOURS (IN) 38 2.16 3.05 1.78 2.66 5.48 4.03 3.68 3.68 4.55 3.19 3.00 2.79 5.48
YEAR OF OCCURRENCE 1993 1997 1985 1999 1981 1994 1994 1987 1986 1993 1990 1982 MAY 1981
NORMAL NO. DAYS WITH:
PRECIPITATION 0.01 30 16.2 11.9 12.8 13.0 10.4 10.0 9.2 9.4 10.2 11.1 13.1 16.5 143.8
PRECIPITATION 1.00 30 0.1 0.1 0.3 0.6 0.8 0.9 0.8 0.9 1.1 0.4 0.6 0.6 7.2
SNOWFALL NORMAL (IN) 30 21.3 11.9 9.9 3.1 0.* 0.0 0.0 0.0 T 0.7 7.2 18.0 72.1
MAXIMUM MONTHLY (IN) 38 46.8 29.6 36.0 12.4 0.2 0.0 T T T 8.4 25.3 59.2 59.2
YEAR OF OCCURRENCE 1999 1994 1965 1982 1990 1990 1993 1967 1967 1991 2000 DEC 2000
MAXIMUM IN 24 HOURS (IN) 38 16.1 9.1 13.2 9.8 0.2 0.0 T T T 8.4 10.4 15.1 16.1
YEAR OF OCCURRENCE 1978 1985 1970 1975 1990 1990 1993 1967 1967 1991 1970 JAN 1978
MAXIMUM SNOW DEPTH (IN) 53 27 21 15 10 0 0 0 0 0 5 11 22 27
YEAR OF OCCURRENCE 1978 1985 1965 1975 1967 1951 1951 JAN 1978
NORMAL NO. DAYS WITH:
SNOWFALL 1.0 30 6.9 4.1 2.9 0.9 0.0 0.0 0.0 0.0 0.0 0.1 2.5 6.0 23.4

2001 Grand Rapids, Michigan (GRR)

PRECIPITATION (inches) 2001 GRAND RAPIDS, MI (GRR)
YEAR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANNUAL
1972 1.26 0.90 2.11 3.85 1.99 4.64 3.72 5.01 3.96 2.92 2.06 4.96 37.38
1973 1.66 1.15 3.34 3.47 4.31 3.58 2.06 1.45 2.47 4.12 3.54 3.28 34.43
1974 3.23 2.09 5.12 2.93 4.01 4.43 0.97 4.61 2.05 2.44 3.11 1.83 36.82
1975 4.36 1.92 2.28 4.07 2.08 5.97 2.31 7.38 2.00 1.04 3.82 4.02 41.25
1976 1.67 2.13 4.99 4.75 6.63 2.79 0.81 1.03 1.21 2.00 1.51 1.05 30.57
1977 1.59 1.35 3.81 4.04 1.33 3.50 5.16 4.77 4.26 2.28 2.34 3.35 37.78
1978 2.22 0.54 2.01 2.55 2.91 4.65 2.83 5.00 5.62 3.05 1.83 3.32 36.53
1979 2.09 0.61 3.72 3.56 1.37 4.16 2.27 4.33 T 2.10 5.46 2.97 32.64
1980 1.76 1.76 1.74 3.64 3.19 4.00 5.90 3.18 4.57 1.99 1.57 3.60 36.90
1981 0.47 2.03 1.29 6.11 8.29 4.22 3.74 2.95 9.52 2.54 2.58 1.10 44.84
1982 2.98 0.36 3.36 2.11 3.63 2.45 3.81 3.07 1.92 1.42 5.36 6.49 36.96
1983 1.33 1.12 3.30 5.06 4.64 2.09 4.76 1.49 4.87 2.66 3.00 2.79 37.11
1984 0.94 1.15 2.77 2.10 4.77 0.62 2.12 1.49 2.16 3.34 2.85 4.37 28.68
1985 1.94 3.26 4.20 2.54 1.36 1.68 3.09 6.48 4.26 4.64 5.45 2.00 40.90
1986 1.07 3.34 2.35 2.58 3.88 7.14 5.27 5.30 11.85 2.76 0.95 1.04 47.53
1987 0.67 0.37 1.15 2.40 0.94 3.56 2.93 8.46 4.47 2.33 2.49 3.29 33.06
1988 2.39 1.14 2.12 3.11 1.07 0.25 3.69 3.04 7.49 5.37 4.82 1.88 36.37
1989 0.95 1.01 2.47 1.79 4.33 5.02 1.29 4.78 4.90 1.53 4.86 0.97 33.90
1990 2.39 2.08 1.96 2.23 4.39 3.00 3.73 3.40 4.22 5.05 7.14 2.97 42.56
1991 1.32 0.64 3.58 5.58 4.44 1.76 6.24 3.79 2.93 5.61 6.41 2.63 44.93
1992 1.52 1.06 3.51 3.98 1.45 1.61 8.83 3.55 5.60 2.34 5.64 3.27 42.36
1993 4.21 1.13 2.31 4.93 2.17 6.05 1.83 7.73 8.20 4.32 2.12 1.47 46.47
1994 2.68 1.70 1.46 3.25 2.64 7.17 8.07 7.39 2.38 3.29 5.44 1.11 46.58
1995 2.73 0.94 1.49 3.85 2.85 3.97 6.11 3.10 1.54 2.78 4.37 1.52 35.25
1996 1.18 0.90 0.96 2.41 4.83 6.33 1.28 0.33 2.72 2.76 1.40 2.45 27.55
1997 2.63 4.80 1.40 1.70 3.05 2.76 1.95 1.99 4.85 2.02 1.49 0.98 29.62
1998 4.09 1.50 4.93 2.75 1.86 2.11 2.49 1.70 2.49 2.98 2.27 1.20 30.37
1999 3.54 1.49 0.96 6.69 2.46 3.81 2.88 3.22 3.21 1.00 0.95 2.31 32.52
2000 1.02 1.09 1.33 3.98 8.65 4.67 4.06 2.31 6.31 1.85 2.82 2.07 40.16
2001 0.71 2.58 0.54 2.05 10.01 3.35 2.00 3.48 3.76 7.38 2.26 2.37 40.49
POR=132 YRS 2.19 1.85 2.47 3.04 3.39 3.58 2.99 2.87 3.53 2.82 2.78 2.38 33.89

2001 Grand Rapids, Michigan (GRR)

AVERAGE TEMPERATURE (F) 2001 GRAND RAPIDS, MI (GRR)
YEAR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANNUAL
1972 20.8 21.9 29.7 42.3 59.3 63.5 70.3 68.7 62.0 46.1 35.9 26.6 45.6
1973 27.4 22.8 41.9 46.8 53.7 69.9 72.4 72.7 63.4 55.0 39.9 26.2 49.3
1974 25.7 21.1 33.6 47.2 53.2 63.0 71.1 67.3 56.4 46.9 37.6 28.4 46.0
1975 25.2 24.3 28.8 39.8 60.7 67.6 70.6 70.5 57.0 53.0 44.7 27.3 47.5
1976 18.9 31.0 37.9 48.2 53.9 69.5 72.5 68.9 60.2 45.7 31.5 19.1 46.4
1977 12.7 22.8 40.0 52.1 65.8 64.5 74.0 67.9 62.9 48.6 39.5 25.9 48.1
1978 19.3 14.4 27.9 45.3 59.9 66.8 70.4 68.1 63.7 47.2 37.6 26.6 45.6
1979 17.1 15.0 36.9 44.5 57.7 67.6 71.1 68.5 63.4 51.5 40.5 33.0 47.2
1980 25.1 22.7 32.5 47.0 59.9 64.4 72.7 72.6 62.7 45.8 37.5 25.1 47.3
1981 20.8 30.2 35.1 47.3 55.5 68.6 72.1 70.7 60.9 48.2 39.8 28.7 48.2
1982 17.2 22.1 32.5 41.8 65.0 62.8 73.1 68.6 61.9 53.6 40.8 36.2 48.0
1983 27.6 30.9 36.9 42.6 52.8 67.7 74.7 72.2 62.4 50.7 40.7 19.2 48.2
1984 17.1 34.0 28.9 47.3 53.5 70.1 70.1 73.0 60.5 54.2 40.3 32.2 48.4
1985 18.6 21.3 36.2 51.7 60.4 63.8 70.7 67.4 63.6 50.6 38.4 22.3 47.1
1986 22.7 22.5 36.7 49.7 58.8 64.4 72.5 66.0 62.8 50.2 35.0 29.8 47.6
1987 25.4 29.9 37.3 50.1 62.6 71.2 74.1 69.3 62.2 45.0 41.1 31.5 50.0
1988 20.8 20.7 34.1 47.1 60.9 68.5 74.7 73.4 61.3 44.2 40.7 27.3 47.8
1989 30.5 19.7 31.8 43.9 55.8 65.9 71.9 68.4 59.4 51.1 35.7 17.2 45.9
1990 32.1 28.1 37.1 47.7 55.0 67.1 70.3 69.0 62.8 49.9 43.3 30.0 49.4
1991 22.2 29.2 37.9 50.8 64.6 71.2 72.4 70.5 60.1 52.0 35.7 29.4 49.7
1992 27.5 30.3 33.7 44.0 57.4 64.3 67.2 65.0 59.7 48.2 38.2 30.5 47.2
1993 25.9 21.9 32.4 44.0 58.2 65.2 72.7 71.4 56.5 48.0 37.9 27.8 46.8
1994 14.5 19.2 34.1 47.9 56.1 68.6 71.1 66.6 63.8 51.7 42.3 33.2 47.4
1995 26.5 23.2 37.0 42.8 56.4 69.8 72.5 74.8 59.1 51.4 32.0 24.2 47.5
1996 21.7 24.4 28.4 43.0 55.6 67.7 68.2 72.2 62.3 50.2 33.2 28.7 46.3
1997 21.6 27.3 34.6 44.1 50.3 68.3 70.8 66.1 61.1 49.9 35.6 31.1 46.7
1998 29.6 34.1 36.1 48.6 64.3 67.4 72.2 72.2 66.0 52.7 42.1 33.3 51.6
1999 21.2 31.4 32.9 48.8 61.0 69.4 74.7 67.8 62.7 49.5 43.6 30.4 49.5
2000 23.4 31.4 42.2 45.9 59.6 66.1 68.6 69.1 60.4 53.6 37.6 19.0 48.1
2001 25.5 25.9 32.5 50.0 59.6 66.3 71.3 71.6 59.3 50.4 46.8 33.9 49.4
POR=108 YRS 24.0 24.7 34.1 46.6 58.0 67.8 72.5 70.4 62.8 51.5 39.1 28.3 48.3

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 Grand Rapids, Michigan (GRR)

HEATING DEGREE DAYS (base 65 F) 2001 GRAND RAPIDS, MI (GRR)
YEAR JUL AUG SEP OCT NOV DEC JAN FEB MAR APR MAY JUN TOTAL
1972-73 28 41 126 577 867 1185 1162 1178 708 552 341 4 6769
1973-74 1 7 136 314 748 1196 1212 1225 967 532 364 113 6815
1974-75 5 22 275 555 816 1127 1227 1133 1113 750 191 61 7275
1975-76 16 5 242 382 602 1161 1420 980 835 526 342 18 6529
1976-77 0 32 185 591 999 1415 1616 1177 765 401 106 91 7378
1977-78 3 48 99 501 759 1204 1407 1413 1140 584 213 62 7433
1978-79 15 22 124 545 816 1182 1477 1393 863 607 264 42 7350
1979-80 7 31 109 431 731 984 1230 1221 1000 541 189 106 6580
1980-81 0 4 115 588 821 1227 1363 969 919 525 298 8 6837
1981-82 7 5 173 513 749 1116 1475 1196 998 689 91 98 7110
1982-83 6 34 140 361 717 884 1151 949 866 663 373 61 6205
1983-84 16 2 149 440 721 1413 1480 892 1107 532 353 13 7118
1984-85 16 4 189 333 735 1014 1431 1216 886 428 173 81 6506
1985-86 9 17 157 436 790 1316 1302 1186 871 466 214 75 6839
1986-87 11 56 118 452 894 1084 1220 978 849 440 178 20 6300
1987-88 18 36 118 610 712 1032 1364 1277 950 531 169 60 6877
1988-89 3 21 135 639 722 1162 1062 1263 1023 625 297 51 7003
1989-90 2 23 203 424 874 1477 1014 1026 865 549 306 45 6808
1990-91 11 15 139 475 645 1077 1323 997 830 430 157 18 6117
1991-92 5 4 211 404 871 1098 1155 1001 964 626 262 75 6676
1992-93 25 66 197 512 794 1060 1204 1203 1004 624 227 84 7000
1993-94 1 16 259 524 810 1150 1561 1274 950 520 297 42 7404
1994-95 0 46 94 405 675 980 1186 1165 860 659 265 28 6363
1995-96 14 0 212 417 982 1260 1337 1166 1130 653 320 29 7520
1996-97 10 2 147 451 944 1119 1338 1048 935 616 448 24 7082
1997-98 8 43 136 473 876 1046 1091 858 899 486 76 98 6090
1998-99 0 2 58 380 682 975 1353 940 989 481 156 49 6065
1999-00 1 17 116 474 634 1066 1282 971 706 567 213 64 6111
2000-01 15 19 199 348 815 1420 1218 1089 1001 444 189 80 6837
2001- 20 1 194 449 538 955

2001 Grand Rapids, Michigan (GRR)

COOLING DEGREE DAYS (base 65 F) 2001 GRAND RAPIDS, MI (GRR)
YEAR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANNUAL
1972 0 0 0 0 37 61 200 163 42 0 0 0 503
1973 0 0 0 10 0 157 238 255 96 12 0 0 768
1974 0 0 0 4 6 60 201 103 23 3 0 0 400
1975 0 0 0 0 65 148 199 184 8 15 0 0 619
1976 0 0 0 27 4 158 239 161 49 0 0 0 638
1977 0 0 0 19 137 85 286 143 44 0 0 0 714
1978 0 0 0 0 62 123 188 125 90 0 0 0 588
1979 0 0 0 0 46 129 204 147 69 19 0 0 614
1980 0 0 0 6 34 96 247 245 53 0 0 0 681
1981 0 0 0 0 13 124 236 190 55 0 0 0 618
1982 0 0 0 0 99 40 263 153 55 12 0 0 622
1983 0 0 0 0 2 146 325 234 76 5 0 0 788
1984 0 0 0 7 5 174 179 259 60 6 0 0 690
1985 0 0 0 36 39 52 193 99 119 0 0 0 538
1986 0 0 0 14 26 64 252 94 61 0 0 0 511
1987 0 0 0 2 110 213 306 174 38 0 0 0 843
1988 0 0 0 0 50 170 310 289 29 2 0 0 850
1989 0 0 0 0 19 84 223 135 40 0 0 0 501
1990 0 0 6 37 6 115 185 144 83 13 0 0 589
1991 0 0 0 12 155 211 240 182 71 7 0 0 878
1992 0 0 0 2 36 60 99 74 44 1 0 0 316
1993 0 0 0 0 21 94 244 222 10 5 0 0 596
1994 0 0 0 13 29 159 196 102 65 1 0 0 565
1995 0 0 0 0 5 179 252 315 40 6 0 0 797
1996 0 0 0 0 33 118 116 230 74 0 0 0 571
1997 0 0 0 0 0 131 194 81 26 13 0 0 445
1998 0 0 9 0 62 177 230 233 95 4 0 0 810
1999 0 0 0 3 39 186 308 110 55 0 0 0 701
2000 0 0 2 0 48 102 132 154 66 2 0 0 506
2001 0 0 0 0 27 128 223 212 30 3 0 0 623

2001 Grand Rapids, Michigan (GRR)

SNOWFALL (inches) 2001 GRAND RAPIDS, MI (GRR)
YEAR JUL AUG SEP OCT NOV DEC JAN FEB MAR APR MAY JUN TOTAL
1972-73 0.0 0.0 0.0 0.9 11.0 19.8 7.0 13.2 8.5 5.0 0.1 0.0 65.5
1973-74 0.0 0.0 0.0 0.0 0.4 20.0 13.3 18.4 11.3 1.0 T 0.0 64.4
1974-75 0.0 0.0 0.0 0.4 8.9 16.5 10.7 10.6 11.8 10.0 0.0 0.0 68.9
1975-76 0.0 0.0 0.0 0.0 6.6 23.3 25.0 6.5 3.5 4.2 0.1 0.0 69.2
1976-77 0.0 0.0 0.0 2.0 8.5 17.7 26.1 5.0 9.5 2.0 0.0 0.0 70.8
1977-78 0.0 0.0 0.0 0.0 10.6 23.2 35.8 8.8 6.2 T 0.0 0.0 84.6
1978-79 0.0 0.0 0.0 T 6.2 30.0 45.5 5.3 7.2 1.8 0.0 0.0 96.0
1979-80 0.0 0.0 0.0 T 9.4 2.6 13.3 12.6 6.6 4.0 T 0.0 48.5
1980-81 0.0 0.0 0.0 0.4 5.5 17.3 8.1 18.8 1.4 T 0.0 0.0 51.5
1981-82 0.0 0.0 0.0 T 4.4 8.9 30.3 6.7 11.8 12.4 0.0 0.0 74.5
1982-83 0.0 0.0 0.0 0.0 5.2 8.2 5.7 2.9 13.2 0.7 0.0 0.0 35.9
1983-84 0.0 0.0 0.0 T 4.7 34.8 19.6 1.6 10.6 0.1 T 0.0 71.4
1984-85 0.0 0.0 0.0 0.0 T 15.7 22.6 21.3 6.7 3.3 0.0 0.0 69.6
1985-86 0.0 0.0 0.0 0.0 3.5 30.7 18.4 20.2 6.1 0.2 0.0 0.0 79.1
1986-87 0.0 0.0 0.0 0.0 5.3 12.7 19.2 0.9 5.7 3.8 0.0 0.0 47.6
1987-88 0.0 0.0 0.0 1.6 0.7 18.2 21.9 18.1 3.4 0.3 0.0 0.0 64.2
1988-89 0.0 0.0 0.0 0.2 5.5 14.4 8.7 25.1 6.3 2.2 T 0.0 62.4
1989-90 0.0 0.0 0.0 5.8 19.4 25.2 10.6 23.8 2.7 2.1 0.2 0.0 89.8
1990-91 T 0.0 0.0 T 2.0 18.6 27.7 9.5 2.8 T 0.0 0.0 60.6
1991-92 0.0 0.0 0.0 0.3 25.3 27.9 13.4 3.5 15.1 2.3 0.0 0.0 87.8
1992-93 0.0 0.0 0.0 2.3 4.2 14.2 11.1 18.6 11.6 3.3 0.0 0.0 65.3
1993-94 0.0 T 0.0 T 1.9 17.7 25.3 29.6 1.9 T 0.1 0.0 76.5
1994-95 0.0 0.0 0.0 0.0 0.6 8.9 21.6 18.6 4.4 0.8 0.0 0.0 54.9
1995-96 0.0 0.0 0.0 T 20.8 17.4 13.5 6.9 19.3 1.8 0.0 0.0 79.7
1996-97 0.0 0.0 0.0 0.0 5.6 22.8 45.5 14.0 5.2 3.5 T 0.0 96.6
1997-98 0.0 0.0 0.0 2.4 10.1 11.5 20.3 0.5 13.8 0.0 0.0 0.0 58.6
1998-99 0.0 0.0 0.0 0.0 0.2 7.5 46.8 8.0 14.2 T T 0.0 76.7
1999-00 0.0 0.0 0.0 0.1 18.4 15.7 11.5 0.6 6.8 T 0.0
2000-01 0.0 0.0 0.0 0.0 19.0 59.2 4.1 7.4 4.1 0.2 T 0.0 94.0
2001- 0.0 0.0 0.0 0.5 T 53.9
POR=37 YRS T T T 0.8 7.7 19.5 20.5 11.7 9.3 2.5 0.2 0.0 72.2



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