2001 DULUTH, MINNESOTA (DLH)



Duluth, Minnesota is located at the western tip of Lake Superior. The city, about 20 miles long, lies at the base of a range of hills that rise abruptly to 600–800 feet above the level of Lake Superior. The range runs in a northeast and southwest direction. Two or 3 miles from the lake the land becomes a slightly rolling plateau.

Duluth in the summer is known as the Air Conditioned City. Being situated below high terrain and along the lake, any easterly component winds automatically cool the city. However, with westerly flow in the summer, the wind generally abates at night, thus, allowing cool lake air to move back into the city area near the lake.

An important influence on the climate is the passage of a succession of high and low pressure systems west and east. The proximity of Lake Superior, which is the largest and coldest of the Great Lakes, modifies the local weather. Summer temperatures are cooler and winter temperatures are warmer. The lake effect at Duluth is most prevalent when low pressure systems pass to the south creating easterly winds. In the summer, warm, moist air flowing over the cold lake surface has a stabilizing effect that results in cool, cloudy weather over Duluth. However, during the winter cold air flowing over the warm open lake surface absorbs moisture that is later precipitated over Duluth as snow. The lake effect is further reflected from the low frequency of severe storms such as wind, hail, tornadoes, freezing rain (glaze), and blizzards when compared to other areas that are a further distance from the lake.

Easterly component winds at Duluth occur 40 to 50 percent of the time from March through August and 20 to 25 percent of the time from November through February. During the winter 60 to 70 percent of the winds are from a westerly component.

The climate of Duluth is predominantly continental with significant local Lake Superior effects. Duluth averages 143 days between the last occurrence of 32 degrees in mid–May and the first in early October. At the Duluth Airport about six miles away from the lake, the average first and last occurrences of 32 degrees are late May and late September, giving a freeze–free period of 123 days.

Fall colors throughout this area are outstanding. Reds, yellows, browns, and combinations of these are an experience to see. Recreation is superb from December through March for cross–country and down–hill skiing and snowmobiling. The snow is dry.

Ice in the harbor forms about mid–November and generally is gone by mid–April. The shipping season can vary from year to year depending on temperatures and the winds that move the ice around. In most years there is little or no shipping during February and March on Lake Superior.

NORMALS, MEANS, AND EXTREMES

DULUTH, MN (DLH)

LATITUDE:    LONGITUDE:     ELEVATION (FT):    TIME ZONE:    WBAN: 14913

46 50′ 38″ N  92 11′ 39″ W  GRND: 1426  BARO: 1429  CENTRAL (UTC + 6)

2001 Duluth, Minnesota (DLH)

ELEMENT POR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC YEAR
TEMPERATURE F NORMAL DAILY MAXIMUM 30 16.2 21.7 32.9 48.2 61.9 71.0 77.1 73.9 63.8 52.3 35.2 20.7 47.9
MEAN DAILY MAXIMUM 54 16.8 22.5 32.6 47.9 61.8 70.6 76.1 74.0 64.1 52.6 35.0 21.7 48.0
HIGHEST DAILY MAXIMUM 60 52 55 78 88 90 94 97 97 95 86 71 55 97
YEAR OF OCCURRENCE 1942 2000 1946 1952 1986 1995 1988 1947 1976 1953 1999 1962 JUL 1988
MEAN OF EXTREME MAXS. 54 36.2 41.2 51.3 70.7 81.8 85.9 88.6 87.5 81.4 73.4 54.8 39.5 66.0
NORMAL DAILY MINIMUM 30 -2.2 2.8 15.7 28.9 39.6 48.5 55.1 53.3 44.5 35.1 21.5 4.9 29.0
MEAN DAILY MINIMUM 54 -1.5 3.6 15.1 29.0 39.9 48.3 54.5 53.2 44.8 35.1 21.2 6.0 29.1
LOWEST DAILY MINIMUM 60 -39 -39 -29 -5 17 27 35 32 22 8 -23 -34 -39
YEAR OF OCCURRENCE 1972 1996 1989 1975 1967 1972 1988 1986 1942 1976 1964 1983 FEB 1996
MEAN OF EXTREME MINS. 54 -26.8 -21.1 -9.8 12.1 26.7 35.6 42.7 40.8 29.4 20.0 0.1 -17.8 11.0
NORMAL DRY BULB 30 7.0 12.3 24.4 38.6 50.8 59.8 66.1 63.7 54.2 43.7 28.4 12.8 38.5
MEAN DRY BULB 54 7.7 13.1 23.8 38.5 50.7 59.6 65.3 63.7 54.4 43.9 28.1 14.0 38.6
MEAN WET BULB 16 10.1 14.4 23.6 34.2 45.8 54.6 59.6 59.1 50.8 38.8 24.5 13.2 35.7
MEAN DEW POINT 16 5.4 8.6 17.1 26.1 38.5 49.9 55.8 55.6 46.8 33.3 20.2 9.1 30.5
NORMAL NO. DAYS WITH:
MAXIMUM 90 30 0.0 0.0 0.0 0.0 0.1 0.2 1.1 0.8 0.2 0.0 0.0 0.0 2.4
MAXIMUM 32 30 27.9 22.3 15.1 2.0 0.0 0.0 0.0 0.0 0.0 0.6 11.8 26.5 106.2
MINIMUM 32 30 31.0 27.8 28.9 20.2 5.6 0.4 0.0 * 2.6 12.4 25.6 30.8 185.3
MINIMUM 0 30 17.4 12.9 4.6 0.1 0.0 0.0 0.0 0.0 0.0 0.0 1.5 12.4 48.9
H/C NORMAL HEATING DEG. DAYS 30 1798 1476 1259 792 445 170 60 113 329 660 1098 1618 9818
NORMAL COOLING DEG. DAYS 30 0 0 0 0 0 14 94 72 0 0 0 0 180
RH NORMAL (PERCENT) 30 72 70 69 64 63 70 71 74 76 71 75 76 71
HOUR 00 LST 30 74 73 74 70 71 79 82 84 84 77 78 78 77
HOUR 06 LST 30 76 76 78 76 76 81 84 88 87 82 81 79 80
HOUR 12 LST 30 69 65 63 56 53 59 59 62 64 62 70 74 63
HOUR 18 LST 30 69 64 62 54 52 58 59 64 68 66 72 74 64
S PERCENT POSSIBLE SUNSHINE 47 48 53 55 56 57 58 65 61 52 46 35 39 52
W/O MEAN NO. DAYS WITH:
HEAVY FOG(VISBY 1/4 MI) 53 2.3 2.5 3.6 3.6 5.2 6.6 5.4 6.4 5.5 4.5 3.3 3.2 52.1
THUNDERSTORMS 59 0.1 0.0 0.6 1.7 3.5 6.7 7.9 6.9 3.9 1.3 0.4 0.1 33.1
CLOUDINESS MEAN:
SUNRISE-SUNSET (OKTAS) 48 5.4 5.2 5.4 5.4 5.3 5.3 4.7 4.7 5.2 5.3 6.0 5.6 5.3
MIDNIGHT-MIDNIGHT (OKTAS) 32 5.0 5.0 5.2 5.0 4.8 4.8 4.3 4.3 4.7 5.0 5.7 5.4 4.9
MEAN NO. DAYS WITH:
CLEAR 49 7.4 7.3 7.0 6.2 6.2 5.1 6.7 7.2 6.3 6.4 4.4 6.0 76.2
PARTLY CLOUDY 49 7.0 6.2 6.9 7.9 9.6 11.0 12.7 11.9 8.4 7.6 5.5 5.8 100.5
CLOUDY 49 16.7 14.7 17.0 15.9 15.2 13.9 10.9 11.3 14.6 16.4 19.5 18.6 184.7
PR MEAN STATION PRESSURE(IN) 28 28.50 28.50 28.50 28.40 28.40 28.40 28.50 28.50 28.50 28.50 28.41 28.51 28.47
MEAN SEA-LEVEL PRES. (IN) 16 30.06 30.07 30.06 29.97 29.96 30.00 29.96 30.01 30.01 30.01 30.02 30.08 30.02
WINDS MEAN SPEED (MPH) 43 11.6 11.6 12.0 12.6 11.9 10.5 9.7 9.5 10.6 11.5 12.2 11.6 11.3
PREVAIL. DIR (TENS OF DEGS) 27 30 31 09 09 09 11 10 11 30 31 30 31 30
MAXIMUM 2-MINUTE:
SPEED (MPH) 5 37 37 47 43 39 33 39 46 33 38 44 41 47
DIR. (TENS OF DEGS) 33 09 08 20 28 09 28 29 26 35 08 28 08
YEAR OF OCCURRENCE 2001 1999 1998 1998 1998 2000 1999 2001 1998 1999 1998 2001 MAR 1998
MAXIMUM 5-SECOND:
SPEED (MPH) 5 44 46 57 57 49 46 47 62 40 49 55 56 62
DIR. (TENS OF DEGS) 33 07 08 20 30 23 28 29 27 01 09 31 29
YEAR OF OCCURRENCE 2001 1999 1998 1998 2000 1999 1999 2001 1998 1999 1998 1999 AUG 2001
PRECIPITATION NORMAL (IN) 30 1.22 0.80 1.91 2.25 3.03 3.82 3.61 3.99 3.84 2.49 1.80 1.24 30.00
MAXIMUM MONTHLY (IN) 60 4.70 2.72 5.12 8.18 7.67 8.04 8.74 10.31 9.38 7.53 5.08 3.70 10.31
YEAR OF OCCURRENCE 1969 1998 1965 2001 1962 1986 1999 1972 1991 1949 2000 1968 AUG 1972
MINIMUM MONTHLY (IN) 60 0.14 0.13 0.22 0.24 0.15 0.55 0.97 0.71 0.19 0.13 0.19 0.13 0.13
YEAR OF OCCURRENCE 1961 1988 1959 1987 1976 1995 1947 1970 1952 1944 1976 1997 DEC 1997
MAXIMUM IN 24 HOURS (IN) 52 1.74 1.38 2.38 2.60 3.25 4.05 3.68 5.79 3.77 2.90 2.64 2.12 5.79
YEAR OF OCCURRENCE 1975 1965 1977 2001 1979 1958 1987 1978 1972 1973 1968 1950 AUG 1978
NORMAL NO. DAYS WITH:
PRECIPITATION 0.01 30 12.1 9.4 10.9 10.4 11.8 12.3 11.2 11.8 12.1 9.8 10.5 11.7 134.0
PRECIPITATION 1.00 30 0.1 0.0 0.2 0.2 0.4 0.8 1.1 1.2 0.9 0.6 0.3 0.1 5.9
SNOWFALL NORMAL (IN) 30 17.2 10.3 14.1 6.3 0.6 0.0 0.0 0.0 0.* 1.3 11.4 16.1 77.3
MAXIMUM MONTHLY (IN) 58 46.8 32.1 45.5 31.5 8.1 0.2 T T 2.4 9.7 50.1 44.3 50.1
YEAR OF OCCURRENCE 1969 2001 1965 1950 1954 1945 1992 1995 1991 1995 1991 1950 NOV 1991
MAXIMUM IN 24 HOURS (IN) 58 16.3 17.0 19.4 11.6 4.3 0.2 T T 2.4 7.9 24.1 25.4 25.4
YEAR OF OCCURRENCE 1994 1948 1965 1983 1954 1945 1992 1995 1991 1966 1991 1950 DEC 1950
MAXIMUM SNOW DEPTH (IN) 53 42 38 48 41 9 0 0 0 0 6 30 32 48
YEAR OF OCCURRENCE 1969 1969 1965 1965 1950 1966 1991 1983 MAR 1965
NORMAL NO. DAYS WITH:
SNOWFALL 1.0 30 4.2 3.3 4.0 1.8 0.2 0.0 0.0 0.0 0.0 0.4 2.9 4.5 21.3

2001 Duluth, Minnesota (DLH)

PRECIPITATION (inches) 2001 DULUTH, MN (DLH)
YEAR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANNUAL
1972 2.28 1.47 1.45 2.17 2.00 3.70 6.71 10.31 5.30 0.83 1.37 2.02 39.61
1973 0.67 0.29 1.54 1.35 3.81 2.43 2.36 8.46 4.28 4.56 1.61 0.69 32.05
1974 0.97 0.82 0.78 2.07 3.09 4.07 4.85 3.79 0.98 1.57 1.36 1.15 25.50
1975 3.69 0.76 2.59 2.21 1.44 5.59 2.26 2.52 2.32 1.20 4.19 0.64 29.41
1976 1.57 1.05 3.67 0.73 0.15 6.16 2.60 1.84 1.84 0.48 0.19 0.39 20.67
1977 0.36 0.47 4.43 1.27 3.50 3.97 3.91 3.26 5.97 3.20 2.37 1.31 34.02
1978 0.52 0.35 0.47 1.96 3.49 2.96 7.67 7.49 1.52 0.77 1.27 1.19 29.66
1979 0.76 1.89 3.58 1.15 6.01 4.33 5.45 2.10 2.01 3.01 0.47 0.16 30.92
1980 1.55 0.56 1.02 0.41 0.82 2.35 3.94 5.34 6.61 1.64 0.70 0.63 25.57
1981 0.32 1.50 1.05 4.48 1.15 5.83 3.26 2.84 2.42 3.59 0.96 0.97 28.37
1982 2.02 0.48 2.06 2.06 4.30 1.97 6.21 1.60 4.19 5.07 3.08 1.19 34.23
1983 1.34 0.49 2.05 2.28 2.12 2.00 3.51 3.37 5.57 2.32 5.01 1.97 32.03
1984 0.78 0.61 0.54 2.34 1.83 5.70 1.33 1.96 3.82 5.19 0.82 1.91 26.83
1985 0.39 0.66 1.85 2.35 4.44 3.18 4.16 3.91 6.02 1.76 2.33 0.78 31.83
1986 0.66 0.74 0.88 4.11 2.59 8.04 4.58 5.29 6.26 0.66 2.01 0.45 36.27
1987 0.69 0.31 0.60 0.24 4.02 0.83 5.46 1.87 2.93 0.96 1.26 0.67 19.84
1988 0.78 0.13 2.55 0.44 3.96 4.56 1.14 6.82 6.18 1.05 3.44 1.12 32.17
1989 1.87 0.34 1.49 2.11 3.50 3.81 1.09 5.02 4.40 1.02 1.01 0.63 26.29
1990 0.51 0.51 3.35 3.76 1.48 4.83 2.42 5.39 6.49 3.51 0.65 0.49 33.39
1991 0.52 0.55 1.17 3.90 6.11 5.64 5.33 2.49 9.38 2.85 4.89 0.61 43.44
1992 0.60 0.58 0.84 2.87 2.87 5.04 3.64 4.13 3.90 1.13 1.84 1.23 28.67
1993 1.79 0.38 0.44 2.42 4.74 6.95 5.75 3.63 1.81 0.56 2.60 1.28 32.35
1994 1.85 0.62 1.11 4.11 1.91 4.54 2.20 3.45 5.61 2.27 2.53 0.33 30.53
1995 1.38 1.04 1.97 2.19 4.13 0.55 5.73 6.67 3.02 4.24 1.84 1.54 34.30
1996 1.35 1.10 0.50 1.47 1.61 5.10 8.37 2.92 5.34 3.08 3.95 0.86 35.65
1997 0.94 0.23 1.48 1.07 1.90 5.17 4.33 1.26 1.75 2.29 0.43 0.13 20.98
1998 0.36 2.72 1.84 1.42 2.21 6.13 1.72 2.59 3.33 4.21 3.42 1.57 31.52
1999 0.87 0.64 0.76 2.96 2.93 4.72 8.74 7.41 5.80 2.35 0.70 0.23 38.11
2000 0.77 1.08 2.64 1.38 3.07 4.18 3.50 4.42 2.02 2.27 5.08 0.93 31.34
2001 1.25 1.76 0.69 8.18 3.49 3.06 1.89 3.31 1.41 2.42 2.21 0.55 30.22
POR=98 YRS 1.12 0.93 1.64 2.27 3.10 4.05 3.78 3.51 3.39 2.25 1.77 1.09 28.90

2001 Duluth, Minnesota (DLH)

AVERAGE TEMPERATURE (F) 2001 DULUTH, MN (DLH)
YEAR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANNUAL
1972 0.2 6.4 17.9 33.3 53.5 58.4 61.2 61.9 50.0 38.9 25.9 7.2 34.6
1973 11.6 13.7 31.8 38.3 47.8 59.1 64.8 65.5 53.6 48.2 27.9 11.7 39.5
1974 5.6 11.0 20.6 37.9 46.6 58.6 67.1 60.1 47.9 42.8 29.2 19.5 37.2
1975 9.6 12.0 18.2 31.0 53.3 57.9 68.7 62.0 50.9 46.7 31.3 11.8 37.8
1976 4.7 20.7 22.0 42.6 50.6 63.2 66.1 64.9 55.3 37.1 22.1 4.5 37.8
1977 -.2 17.2 31.4 44.4 57.4 60.0 65.9 58.6 53.2 44.3 28.0 11.3 39.3
1978 5.1 10.5 25.6 38.3 54.8 60.2 64.7 63.6 57.3 44.9 26.2 10.1 38.4
1979 0.6 5.0 23.0 34.5 47.2 59.8 66.1 62.0 56.9 43.0 29.4 22.2 37.5
1980 8.7 10.7 19.7 41.4 54.9 59.5 67.6 63.6 52.9 38.9 30.1 11.6 38.3
1981 11.9 16.3 28.3 39.2 50.2 58.7 65.5 64.3 52.9 40.5 34.7 14.8 39.8
1982 -3.2 10.6 20.8 35.7 52.8 54.8 64.5 60.8 54.3 45.1 24.4 19.6 36.7
1983 13.2 21.1 25.6 35.1 46.7 59.9 69.6 69.7 56.6 44.9 31.6 1.8 39.7
1984 7.1 23.0 18.7 42.4 50.5 61.4 66.6 67.7 51.9 45.7 28.4 13.2 39.7
1985 6.5 11.6 30.3 42.1 54.9 56.5 64.6 59.7 52.1 42.7 19.9 3.0 37.0
1986 11.7 11.5 28.5 42.1 51.8 58.9 64.7 60.8 52.7 43.4 24.0 18.8 39.1
1987 15.3 23.7 31.6 46.1 53.1 63.1 67.6 63.5 57.2 39.4 32.2 20.4 42.8
1988 4.8 6.2 24.4 40.1 56.0 62.8 70.0 64.5 55.4 38.6 28.9 13.5 38.8
1989 14.3 3.4 18.9 36.8 51.7 58.4 68.6 64.8 55.9 44.4 23.2 4.1 37.0
1990 18.7 14.9 27.1 40.2 48.3 61.5 64.6 64.1 56.2 42.1 31.4 12.6 40.1
1991 5.9 19.4 26.1 42.7 54.7 61.7 63.8 66.3 53.0 40.4 22.0 15.9 39.3
1992 16.7 21.2 25.9 36.2 53.8 56.3 59.4 60.5 53.8 41.7 27.3 15.9 39.1
1993 11.9 14.5 27.1 37.2 50.3 57.1 63.6 65.0 49.5 40.0 24.4 17.0 38.1
1994 -2.1 6.5 28.6 39.6 53.8 62.5 64.5 62.5 58.5 47.2 33.6 21.3 39.7
1995 13.7 11.7 28.2 34.7 52.4 65.1 66.8 67.4 55.1 43.7 20.6 12.1 39.3
1996 2.2 11.9 19.4 33.7 48.2 60.4 62.1 65.4 56.2 43.6 21.6 11.2 36.3
1997 7.0 14.5 23.5 35.7 45.8 62.2 63.8 61.0 57.5 43.9 24.9 22.7 38.5
1998 16.4 29.0 25.4 44.1 55.9 58.8 65.7 67.1 59.3 45.9 32.1 18.7 43.2
1999 9.3 21.3 27.8 41.4 53.6 60.6 67.6 63.5 54.5 42.3 36.2 19.7 41.5
2000 10.3 21.4 33.4 38.1 52.9 56.0 64.6 64.7 53.9 46.9 28.6 4.4 39.6
2001 17.4 7.8 24.5 39.8 52.8 60.9 65.7 67.0 55.4 43.4 39.5 22.2 41.4
POR=98 YRS 8.6 12.9 24.3 38.4 49.6 58.7 65.2 63.7 55.1 44.1 28.6 14.7 38.7

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 Duluth, Minnesota (DLH)

HEATING DEGREE DAYS (base 65 F) 2001 ALBUQUERQUE, NM (ABQ)
YEAR JUL AUG SEP OCT NOV DEC JAN FEB MAR APR MAY JUN TOTAL
1972-73 0 3 14 244 740 925 1020 811 607 440 113 3 4920
1973-74 0 0 43 257 606 955 963 754 373 255 29 4 4239
1974-75 0 2 68 212 593 1020 1051 748 614 449 143 6 4906
1975-76 0 0 47 256 664 905 979 622 634 304 99 1 4511
1976-77 0 0 35 367 726 985 1084 675 669 250 61 0 4852
1977-78 0 0 1 192 551 757 870 713 454 215 175 2 3930
1978-79 0 0 20 167 521 945 988 665 509 241 100 12 4168
1979-80 0 0 23 148 715 840 763 595 577 379 139 2 4181
1980-81 0 0 6 335 640 752 827 611 575 197 62 2 4007
1981-82 0 0 3 280 534 754 895 709 538 268 94 0 4075
1982-83 0 0 23 314 658 941 922 703 556 439 127 0 4683
1983-84 0 0 11 198 592 875 948 714 559 362 22 3 4284
1984-85 0 0 51 411 631 903 960 744 536 220 74 7 4537
1985-86 0 0 61 228 581 842 727 610 431 249 80 8 3817
1986-87 0 0 51 313 680 882 1004 717 653 300 81 2 4683
1987-88 0 0 2 133 589 914 937 605 551 290 103 2 4126
1988-89 0 5 39 118 579 959 909 640 373 133 31 0 3786
1989-90 0 0 10 260 551 918 934 735 501 233 103 0 4245
1990-91 0 0 14 202 595 1013 903 563 581 263 60 12 4206
1991-92 0 0 21 188 645 851 994 651 493 170 53 5 4071
1992-93 0 0 8 128 752 991 778 624 496 238 69 3 4087
1993-94 0 0 15 284 642 853 827 676 453 218 52 0 4020
1994-95 0 0 1 251 610 741 793 435 433 320 67 0 3651
1995-96 0 0 37 165 419 741 787 540 558 239 12 0 3498
1996-97 0 0 66 297 575 809 973 676 403 366 48 12 4225
1997-98 0 0 9 278 635 994 834 727 558 376 51 4 4466
1998-99 0 0 0 225 549 816 744 584 435 332 98 5 3788
1999-00 0 0 23 203 447 902 740 571 528 184 32 0 3630
2000-01 0 0 16 302 760 858 961 619 509 218 35 3 4281
2001- 0 0 1 134 508 881

2001 Duluth, Minnesota (DLH)

COOLING DEGREE DAYS (base 65 F) 2001 DULUTH, MN (DLH)
YEAR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANNUAL
1972 0 0 0 0 8 22 24 59 0 0 0 0 113
1973 0 0 0 0 0 1 72 84 18 0 0 0 175
1974 0 0 0 0 0 19 115 15 0 0 0 0 149
1975 0 0 0 0 2 18 168 41 0 0 0 0 229
1976 0 0 0 0 0 53 75 117 26 0 0 0 271
1977 0 0 0 0 12 24 80 6 0 0 0 0 122
1978 0 0 0 0 17 34 70 64 39 0 0 0 224
1979 0 0 0 0 4 25 95 30 15 0 0 0 169
1980 0 0 0 0 25 46 126 40 3 0 0 0 240
1981 0 0 0 0 2 2 97 48 6 0 0 0 155
1982 0 0 0 0 0 0 58 36 18 0 0 0 112
1983 0 0 0 0 0 42 179 165 42 0 0 0 428
1984 0 0 0 0 4 13 96 133 4 0 0 0 250
1985 0 0 0 0 9 4 54 20 15 0 0 0 102
1986 0 0 0 0 13 18 74 26 0 0 0 0 131
1987 0 0 0 0 13 62 121 60 7 0 0 0 263
1988 0 0 0 0 27 83 183 89 4 0 0 0 386
1989 0 0 0 0 0 17 147 80 7 0 0 0 251
1990 0 0 0 7 0 32 70 73 16 0 0 0 198
1991 0 0 0 0 20 35 69 117 8 0 0 0 249
1992 0 0 0 0 13 18 9 37 3 3 0 0 83
1993 0 0 0 0 0 8 36 76 0 0 0 0 120
1994 0 0 0 0 11 36 52 43 8 0 0 0 150
1995 0 0 0 0 7 107 105 99 14 4 0 0 336
1996 0 0 0 0 0 44 25 58 21 0 0 0 148
1997 0 0 0 0 0 27 67 37 8 0 0 0 139
1998 0 0 0 0 8 12 81 93 32 0 0 0 226
1999 0 0 0 0 12 33 127 35 20 0 0 0 227
2000 0 0 0 0 2 10 69 51 9 0 0 0 141
2001 0 0 0 0 0 49 96 117 17 0 0 0 279

2001 Duluth, Minnesota (DLH)

SNOWFALL (inches) 2001 DULUTH, MN (DLH)
YEAR JUL AUG SEP OCT NOV DEC JAN FEB MAR APR MAY JUN TOTAL
1972-73 0.0 0.0 T 0.5 6.7 20.0 9.2 3.0 2.1 2.8 1.5 0.0 45.8
1973-74 0.0 0.0 0.0 T 7.6 15.7 13.4 15.3 15.1 5.2 1.0 0.0 73.3
1974-75 0.0 0.0 0.3 0.8 4.5 19.1 32.7 12.3 30.3 0.4 T 0.0 100.4
1975-76 0.0 0.0 0.0 0.1 25.7 7.8 20.6 8.8 26.4 0.0 T 0.0 89.4
1976-77 0.0 0.0 0.0 0.8 2.7 7.8 8.8 5.1 15.3 0.1 0.0 0.0 40.6
1977-78 0.0 0.0 0.0 1.7 16.0 12.0 13.5 11.4 8.3 6.8 0.0 0.0 69.7
1978-79 0.0 0.0 0.0 T 10.1 20.8 11.9 23.3 17.0 4.2 1.4 0.0 88.7
1979-80 0.0 0.0 0.0 0.8 6.0 2.0 21.9 10.3 12.6 1.5 T 0.0 55.1
1980-81 0.0 0.0 0.0 1.3 1.6 7.1 4.7 13.3 4.2 4.3 T 0.0 36.5
1981-82 0.0 0.0 T 1.4 12.5 15.5 34.2 8.0 17.8 6.3 0.0 0.0 95.7
1982-83 0.0 0.0 0.0 0.8 16.0 21.4 15.7 9.0 9.9 23.7 T 0.0 96.5
1983-84 0.0 0.0 T T 37.7 32.1 20.0 4.0 9.9 3.3 0.3 0.0 107.3
1984-85 0.0 0.0 T 3.5 2.4 8.2 15.3 12.0 26.7 0.1 0.0 0.0 68.2
1985-86 0.0 0.0 0.7 2.3 34.1 18.8 11.5 10.3 11.4 0.2 T 0.0 89.3
1986-87 0.0 0.0 0.0 1.8 8.2 7.3 11.2 5.1 6.7 0.3 T 0.0 40.6
1987-88 0.0 0.0 0.0 3.9 5.8 11.3 16.7 2.3 13.7 0.1 0.0 0.0 53.8
1988-89 0.0 0.0 0.0 0.3 24.3 20.7 31.2 5.3 17.6 19.0 0.7 0.0 119.1
1989-90 0.0 T 0.0 0.6 8.4 14.2 5.5 15.0 11.6 2.4 0.6 T 58.3
1990-91 0.0 0.0 0.0 3.2 5.1 13.5 11.4 9.7 9.5 8.5 2.9 0.0 63.8
1991-92 0.0 0.0 2.4 4.3 50.1 12.9 9.3 10.6 0.7 9.7 0.0 0.0 100.0
1992-93 T 0.0 T 5.1 29.4 15.5 24.9 10.0 5.8 3.5 T 0.0 94.2
1993-94 0.0 0.0 T 0.6 28.5 15.1 35.3 7.9 13.0 10.0 0.0 T 110.4
1994-95 0.0 0.0 0.0 0.2 15.5 6.2 12.8 17.6 20.9 16.2 T 0.0 89.4
1995-96 0.0 T 0.1 9.7 20.4 25.9 34.0 21.3 11.4 12.6 T
1996-97 15.9 41.7 35.5 8.9 23.6 1.7 0.1 0.0
1997-98 0.0 0.0 0.0 1.2 16.9 6.0 29.9 9.6 14.2 2.3 0.0 T 80.1
1998-99 0.0 T 0.0 T 15.7 12.8 18.9 13.5 17.8 11.5 0.0 0.0 90.2
1999-00 0.0 0.0 0.0 0.0 6.2 4.4 16.5 13.3 9.5 5.6 T 0.0 55.5
2000-01 0.0 0.0 0.0 T 17.5 19.2 14.9 32.1 7.9 7.7 0.0 0.0 99.3
2001- 0.0 0.0 0.0 2.0 11.4 7.3
POR=57 YRS T T 0.1 1.5 12.9 15.0 17.6 11.7 13.3 6.6 1.0 T 79.7



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