2001 SIOUX FALLS, SOUTH DAKOTA (FSD)



Sioux Falls is located in the Big Sioux River Valley in southeast South Dakota. The surrounding terrain is gently rolling. The land slopes upward for about 100 miles north and northwest to an elevation about 400 feet higher than the city. To the southeast, the land slopes downward 200 to 300 feet over the same distance. Little change in elevation occurs in the remaining directions.

The climate is of the continental type. There are frequent weather changes from day to day or week to week as the locality is visited by differing air masses. Cold air masses arrive from the interior of Canada, cool, dry air from the northern Pacific, warm, moist air from the Gulf of Mexico, or hot, dry air from the southwest.

Temperatures fluctuate frequently as cold air masses move in very rapidly. During the late fall and winter, cold fronts accompanied by strong, gusty winds drop temperatures by 20 to 30 degrees in a 24–hour period. Severe cold spells usually last only a few days. The winter months of December through February have experienced cold spells with average temperatures under 8 degrees and more than 60 consecutive days below 32 degrees.

Temperatures of 100 degrees and above occur about one in every three years, and will most likely happen in July. Summer nights are usually comfortable with temperatures below 70 degrees.

Rainfall is heavier during the spring and summer with lighter amounts in winter. Nearly 64 percent of the normal yearly precipitation falls during the growing season of April through August.

One or two very heavy snows usually fall each winter. Eight to 12 inches of snow may fall in 24 hours. There have been a few snows in excess of 15 inches and almost 30 inches have fallen during a severe winter storm. Strong winds often cause drifting snow, and blizzard conditions may block highways for a day or so.

Southerly winds prevail from late spring to early fall with northwest winds the remainder of the year. Strong winds of 70 mph with gusts to 90 mph have occurred.

Thunderstorms are frequent during the late spring and summer with June and July the most active months. The thunderstorms usually occur during the late afternoon and evening with a secondary peak of activity between 2 and 5 in the morning. Some of the most severe thunderstorms with damaging winds, hail and an occasional tornado, occur most frequently June.

There is occasional flooding in the lower areas of Sioux Falls along the Big Sioux River and Skunk Creek. Runoff from the melting snow in the spring often causes substantial rises in the rivers. A diversion canal around Sioux Falls has reduced the threat of damaging floods.

Based on the 1951–1980 period, the average first occurrence of 32 degrees Fahrenheit in the fall is October 1 and the average last occurrence in the spring is May 10.

NORMALS, MEANS, AND EXTREMES

SIOUX FALLS, SD (FSD)

LATITUDE:    LONGITUDE:     ELEVATION (FT):    TIME ZONE:    WBAN: 14944

43 34′ 37″ N  96 45′ 13″ W  GRND:  1425  BARO: &#x 0A0;1428  CENTRAL (UTC + 6)

2001 Sioux Falls, South Dakota (FSD)

ELEMENT POR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC YEAR
TEMPERATURE F NORMAL DAILY MAXIMUM 30 24.3 29.6 42.3 59.0 70.7 80.5 86.3 83.3 73.1 61.2 43.4 28.0 56.8
MEAN DAILY MAXIMUM 70 24.7 30.2 41.8 58.3 70.9 80.0 85.7 83.5 73.7 61.8 42.9 29.5 56.9
HIGHEST DAILY MAXIMUM 56 66 70 87 94 100 110 108 108 104 94 81 63 110
YEAR OF OCCURRENCE 1981 1982 1968 1962 1967 1988 1989 1973 1976 1963 1999 1998 JUN 1988
MEAN OF EXTREME MAXS. 70 45.3 51.1 67.2 81.9 88.5 94.8 98.4 96.7 90.6 81.9 65.2 49.8 76.0
NORMAL DAILY MINIMUM 30 3.3 9.7 22.6 34.8 45.9 56.1 62.3 59.4 48.7 36.0 22.6 8.6 34.2
MEAN DAILY MINIMUM 70 4.7 10.3 22.2 34.8 46.7 56.6 62.3 60.0 49.4 37.4 22.9 10.7 34.8
LOWEST DAILY MINIMUM 56 -36 -31 -23 5 17 33 38 34 22 9 -17 -28 -36
YEAR OF OCCURRENCE 1970 1962 1948 1982 1967 1969 1971 1950 1974 1972 1964 1990 JAN 1970
MEAN OF EXTREME MINS. 70 -18.8 -15.0 -.5 18.7 30.4 41.8 49.3 45.9 31.9 19.8 2.5 -12.6 16.1
NORMAL DRY BULB 30 13.8 19.7 32.5 46.9 58.4 68.3 74.3 71.4 60.9 48.6 33.0 18.3 45.5
MEAN DRY BULB 70 14.8 20.1 31.8 46.5 58.7 68.4 74.1 71.8 61.7 49.6 32.9 20.2 45.9
MEAN WET BULB 18 15.9 20.6 29.8 40.9 52.8 61.4 66.0 64.9 55.1 43.0 29.1 18.8 41.5
MEAN DEW POINT 18 11.4 15.9 24.6 33.9 46.7 56.2 62.0 61.0 50.2 36.7 24.1 14.6 36.4
NORMAL NO. DAYS WITH:
MAXIMUM 90 30 0.0 0.0 0.0 0.2 0.7 4.3 10.4 7.6 1.8 0.1 0.0 0.0 25.1
MAXIMUM 32 30 20.9 15.5 7.2 0.3 0.0 0.0 0.0 0.0 0.0 * 5.8 19.0 68.7
MINIMUM 32 30 30.9 27.3 25.7 12.6 2.1 0.0 0.0 0.0 1.3 11.2 25.4 30.5 167.0
MINIMUM 0 30 13.4 7.9 1.6 0.0 0.0 0.0 0.0 0.0 0.0 0.0 1.2 8.3 32.4
H/C NORMAL HEATING DEG. DAYS 30 1587 1268 1008 543 240 50 10 22 165 508 960 1448 7809
NORMAL COOLING DEG. DAYS 30 0 0 0 0 35 149 298 220 42 0 0 0 744
RH NORMAL (PERCENT) 30 72 73 72 64 64 65 65 68 70 67 73 76 69
HOUR 00 LST 30 75 77 78 73 72 75 76 78 79 75 79 78 76
HOUR 06 LST 30 75 78 82 80 80 82 83 85 86 81 82 80 81
HOUR 12 LST 30 67 67 64 54 53 55 53 55 57 55 64 70 60
HOUR 18 LST 30 70 69 63 51 50 51 50 53 56 57 69 75 60
S PERCENT POSSIBLE SUNSHINE 5 56 46 55 50 48 67 68 70 70 68 57 52 59
W/O MEAN NO. DAYS WITH:
HEAVY FOG(VISBY 1/4 MI) 56 2.5 3.0 2.6 1.0 0.7 0.5 0.7 1.2 1.4 1.5 2.6 3.7 21.4
THUNDERSTORMS 56 0.0 0.1 0.9 2.9 6.0 8.7 9.4 7.7 5.2 2.0 0.4 0.1 43.4
CLOUDINESS MEAN:
SUNRISE-SUNSET (OKTAS)
MIDNIGHT-MIDNIGHT (OKTAS)
MEAN NO. DAYS WITH:
CLEAR 1 2.0 11.0
PARTLY CLOUDY 1 3.0 3.0
CLOUDY 1 11.0 7.0
PR MEAN STATION PRESSURE(IN) 29 28.54 28.54 28.45 28.43 28.42 28.42 28.46 28.49 28.50 28.50 28.49 28.54 28.48
MEAN SEA-LEVEL PRES. (IN) 18 30.12 30.12 30.04 29.95 29.92 29.91 29.95 29.99 29.99 30.02 30.05 30.12 30.01
WINDS MEAN SPEED (MPH) 42 10.9 11.0 12.1 12.7 11.6 10.4 9.6 9.5 10.1 10.6 11.5 10.7 10.9
PREVAIL. DIR (TENS OF DEGS) 27 31 31 34 36 18 18 18 18 18 18 31 30 18
MAXIMUM 2-MINUTE:
SPEED (MPH) 5 44 41 44 51 41 52 51 44 43 41 43 43 52
DIR. (TENS OF DEGS) 31 34 30 32 18 08 32 03 34 19 30 32 08
YEAR OF OCCURRENCE 2000 1999 1999 2000 1997 2001 1998 1998 1997 1997 1998 2000 JUN 2001
MAXIMUM 5-SECOND:
SPEED (MPH) 5 52 48 55 62 53 56 64 54 49 52 54 52 64
DIR. (TENS OF DEGS) 30 33 30 32 28 08 32 03 34 29 31 32 32
YEAR OF OCCURRENCE 2000 1999 1999 2000 1998 2001 1998 1998 1997 1997 1998 2000 JUL 1998
PRECIPITATION NORMAL (IN) 30 0.51 0.64 1.64 2.52 3.03 3.40 2.68 2.85 3.02 1.78 1.09 0.70 23.86
MAXIMUM MONTHLY (IN) 56 1.71 4.05 4.08 6.97 8.26 8.43 8.41 9.09 9.26 6.28 4.76 2.62 9.26
YEAR OF OCCURRENCE 1969 1962 1998 2001 1993 1984 1992 1975 1986 1998 2001 1968 SEP 1986
MINIMUM MONTHLY (IN) 56 0.05 0.05 0.14 0.17 0.61 0.91 0.25 0.53 0.29 T 0.02 T T
YEAR OF OCCURRENCE 1958 1986 1967 1969 1981 1988 1947 1970 1956 1952 1980 1986 DEC 1986
MAXIMUM IN 24 HOURS (IN) 56 1.61 2.00 2.53 3.72 3.92 4.32 3.39 4.59 4.02 4.54 2.68 1.44 4.59
YEAR OF OCCURRENCE 1960 1962 1995 2001 1972 1957 1992 1975 1966 1973 2001 1955 AUG 1975
NORMAL NO. DAYS WITH:
PRECIPITATION 0.01 30 6.8 6.8 8.7 10.0 10.8 10.5 9.6 8.6 8.5 6.2 6.6 6.3 99.4
PRECIPITATION 1.00 30 * 0.1 0.2 0.4 0.6 0.8 0.6 0.6 1.0 0.4 0.3 0.0 5.0
SNOWFALL NORMAL (IN) 30 6.7 7.7 8.0 2.2 0.* 0.0 0.0 0.0 0.* 0.6 5.1 7.8 38.1
MAXIMUM MONTHLY (IN) 56 19.6 48.4 31.5 18.4 0.2 T T T 0.9 10.0 21.9 41.1 48.4
YEAR OF OCCURRENCE 1969 1962 1951 1983 1954 1994 1995 2001 1985 1991 1985 1968 FEB 1962
MAXIMUM IN 24 HOURS (IN) 56 11.8 26.0 18.9 10.5 0.2 T T T 0.9 8.8 12.6 16.6 26.0
YEAR OF OCCURRENCE 1960 1962 1956 1994 1954 1994 1995 2001 1985 1991 1998 1968 FEB 1962
MAXIMUM SNOW DEPTH (IN) 58 33 34 33 10 1 0 0 0 0 3 13 34 34
YEAR OF OCCURRENCE 1969 1969 1969 1969 1947 1982 1983 1968 DEC 1968
NORMAL NO. DAYS WITH:
SNOWFALL 1.0 30 2.2 2.1 2.2 0.6 0.0 0.0 0.0 0.0 0.0 0.2 1.6 2.2 11.1

2001 Sioux Falls, South Dakota (FSD)

PRECIPITATION (inches) 2001 SIOUX FALLS, SD (FSD)
YEAR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANNUAL
1972 0.18 0.40 0.97 2.73 7.25 2.09 3.49 2.65 1.75 1.78 1.89 1.25 26.43
1973 0.43 0.43 3.52 2.12 1.93 2.38 3.50 1.05 5.61 5.73 1.01 0.48 28.19
1974 0.13 0.30 1.65 1.33 3.11 2.79 1.27 5.16 0.58 0.34 0.27 0.10 17.03
1975 1.35 0.22 1.95 2.45 1.66 4.48 0.62 9.09 1.35 0.49 2.25 0.19 26.10
1976 0.41 0.48 1.60 2.15 1.02 1.02 1.53 1.31 0.76 0.71 0.07 0.36 11.42
1977 0.19 0.83 3.60 2.17 3.17 1.73 3.64 5.63 5.63 2.36 1.80 0.87 31.62
1978 0.47 0.33 0.56 3.98 3.47 2.91 4.79 3.08 2.45 0.14 0.48 0.51 23.17
1979 1.14 0.41 3.47 2.75 4.90 3.01 3.13 4.35 4.03 3.30 1.72 0.04 32.25
1980 0.18 0.47 0.70 0.77 2.52 2.17 1.63 2.92 0.79 1.36 0.02 0.29 13.82
1981 0.12 0.33 1.86 0.58 0.61 3.90 3.89 2.28 0.50 2.45 1.21 0.38 18.11
1982 0.76 0.13 1.17 1.87 4.72 1.18 4.60 5.23 3.49 5.18 2.94 1.99 33.26
1983 0.52 0.22 3.35 2.88 2.92 6.75 1.82 2.00 1.92 0.71 2.95 0.73 26.77
1984 0.37 1.10 1.83 5.79 2.95 8.43 1.63 0.76 1.62 4.11 0.03 1.02 29.64
1985 0.45 0.05 2.37 5.18 3.29 2.52 2.70 4.07 3.34 0.75 1.97 0.47 27.16
1986 0.72 0.05 1.50 5.15 2.42 3.93 2.59 2.77 9.26 1.22 0.89 T 30.50
1987 0.19 0.26 3.27 0.28 2.94 1.78 3.16 1.36 2.05 0.31 1.66 1.40 18.66
1988 1.54 0.25 0.63 3.00 1.54 0.91 0.49 4.02 4.39 0.02 1.98 0.37 19.14
1989 0.23 0.51 1.07 1.59 1.42 2.50 1.37 2.46 3.38 0.10 0.91 0.25 15.79
1990 0.08 0.31 1.57 1.86 4.07 4.86 1.77 1.17 0.47 1.82 0.61 0.61 19.20
1991 0.22 0.34 0.86 2.21 6.20 6.36 2.26 1.41 3.95 1.65 1.78 0.20 27.44
1992 0.75 1.76 2.36 2.01 1.80 2.44 8.41 5.29 3.06 2.72 1.04 0.83 32.47
1993 0.70 0.81 2.04 2.61 8.26 6.43 7.86 3.10 1.88 0.62 1.50 0.30 36.11
1994 0.97 0.63 0.20 3.34 1.26 6.03 1.70 2.66 2.36 2.36 1.03 0.33 22.87
1995 0.18 0.13 4.06 5.83 4.76 2.70 2.55 5.11 1.86 2.76 0.38 0.10 30.42
1996 0.99 0.16 0.82 0.55 5.27 1.14 0.98 1.79 2.82 1.63 2.91 0.78 19.84
1997 0.41 1.39 0.23 2.43 3.58 3.77 2.94 1.58 1.59 1.75 0.35 0.24 20.26
1998 0.50 0.67 4.08 3.57 1.92 4.52 2.66 3.29 1.19 6.28 2.20 0.24 31.12
1999 0.35 0.28 1.15 4.32 6.20 2.57 4.81 0.80 0.84 0.37 0.05 0.17 21.91
2000 0.68 1.04 0.91 2.27 5.56 3.26 3.22 3.17 1.34 1.79 2.52 0.35 26.11
2001 1.50 0.65 0.78 6.97 1.92 3.13 5.88 1.37 2.25 0.86 4.76 0.11 30.18
POR=111 YRS 0.62 0.77 1.47 2.58 3.55 4.10 3.03 3.06 2.65 1.54 1.07 0.70 25.14

2001 Sioux Falls, South Dakota (FSD)

AVERAGE TEMPERATURE (F) 2001 SIOUX FALLS, SD (FSD)
YEAR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANNUAL
1972 8.9 11.5 31.5 43.8 59.1 66.7 70.2 70.5 59.5 44.4 31.9 14.8 42.7
1973 18.5 23.1 39.7 46.4 56.9 68.9 74.4 76.7 60.1 52.9 34.7 17.1 47.5
1974 12.8 24.3 34.5 48.9 55.7 65.9 79.2 67.6 57.7 51.4 33.9 23.6 46.3
1975 17.1 16.5 25.5 41.4 61.1 67.6 78.5 72.7 57.0 52.1 33.5 20.4 45.3
1976 15.6 29.5 34.8 51.0 57.1 71.5 76.7 75.2 62.9 44.3 27.6 16.6 46.9
1977 4.7 25.6 36.0 53.8 66.8 71.1 77.0 68.1 61.9 47.7 31.3 16.3 46.7
1978 1.9 8.6 30.5 44.3 57.7 66.6 70.9 71.1 66.7 47.8 31.3 14.6 42.7
1979 1.8 7.5 28.2 44.1 55.2 67.8 74.0 69.9 64.3 48.2 30.2 27.1 43.2
1980 18.1 18.1 31.7 50.1 58.4 68.8 74.2 71.1 62.0 45.5 36.7 21.2 46.3
1981 22.3 26.0 38.4 53.5 58.3 70.4 75.5 71.1 63.0 48.7 39.5 18.0 48.7
1982 3.8 20.2 32.8 43.9 59.6 62.6 74.4 71.3 60.0 48.8 30.3 24.5 44.4
1983 20.1 26.2 33.1 41.5 55.1 66.7 77.1 78.3 63.5 49.6 34.9 2.1 45.7
1984 17.4 27.8 24.6 45.8 55.9 68.1 73.6 74.2 57.2 50.4 36.2 20.4 46.0
1985 13.4 19.9 37.8 52.8 62.7 64.2 71.5 66.3 58.2 46.6 20.7 9.5 43.6
1986 20.7 16.9 36.9 48.2 58.8 69.6 75.0 66.5 59.6 48.6 28.7 25.2 46.2
1987 24.0 32.8 37.8 52.6 64.9 71.4 77.0 68.8 62.8 43.9 38.1 24.4 49.9
1988 9.6 15.0 36.4 46.4 65.1 76.3 77.4 74.8 62.6 44.6 34.2 22.1 47.0
1989 25.5 9.2 29.8 47.8 58.0 66.9 77.3 72.0 60.2 49.5 29.5 11.5 44.8
1990 28.2 24.9 36.7 46.4 56.4 70.1 71.2 72.9 66.5 48.0 35.6 15.3 47.7
1991 13.7 29.8 37.0 50.0 62.5 73.5 73.1 72.8 62.0 46.1 25.7 26.0 47.7
1992 26.5 30.0 36.7 43.7 60.5 67.0 65.5 66.1 60.3 48.7 30.4 19.2 46.2
1993 14.0 15.0 29.0 44.1 57.1 65.1 71.4 71.4 56.8 47.1 29.9 21.9 43.6
1994 6.2 13.3 36.6 46.5 63.9 71.6 70.8 69.5 65.2 52.4 36.5 21.8 46.2
1995 17.7 23.5 34.8 41.8 55.7 70.0 75.1 76.9 60.4 48.3 29.2 23.7 46.4
1996 10.9 22.6 27.4 42.4 54.9 68.8 69.1 70.0 59.4 47.7 23.5 10.3 42.3
1997 8.6 17.9 30.6 40.6 51.5 68.8 72.4 68.9 62.4 49.4 27.9 26.1 43.8
1998 19.6 31.8 28.0 46.5 61.7 63.1 71.9 71.0 66.3 50.6 35.5 24.0 47.5
1999 14.0 29.9 33.8 45.7 58.5 66.9 75.1 70.6 59.7 48.5 42.1 25.1 47.5
2000 17.3 30.4 39.4 46.0 59.2 65.7 71.7 71.6 61.4 51.1 25.0 7.7 45.5
2001 18.8 11.1 26.7 48.1 59.1 68.7 75.7 72.2 61.3 48.2 43.6 25.0 46.5
POR=81 YRS 15.2 20.7 32.2 46.9 58.9 68.4 73.2 71.7 61.8 49.8 33.0 20.4 46.0

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 Sioux Falls, South Dakota (FSD)

HEATING DEGREE DAYS (base 65 F) 2001 SIOUX FALLS, SD (FSD)
YEAR JUL AUG SEP OCT NOV DEC JAN FEB MAR APR MAY JUN TOTAL
1972-73 29 43 194 631 984 1555 1440 1166 775 549 256 19 7641
1973-74 1 0 178 373 902 1481 1616 1133 939 477 303 85 7488
1974-75 2 39 240 419 927 1279 1476 1351 1217 701 157 51 7859
1975-76 3 5 271 407 937 1377 1528 1023 929 418 261 23 7182
1976-77 1 0 142 643 1114 1495 1867 1097 891 341 38 4 7633
1977-78 0 22 125 530 1000 1503 1957 1576 1063 613 252 78 8719
1978-79 11 18 104 525 1004 1554 1960 1607 1134 622 321 40 8900
1979-80 0 28 103 512 1038 1168 1448 1349 1027 464 243 32 7412
1980-81 1 14 157 602 841 1354 1318 1087 816 353 230 5 6778
1981-82 5 5 114 497 758 1452 1899 1247 991 632 174 105 7879
1982-83 0 28 188 494 1035 1249 1385 1082 982 699 317 67 7526
1983-84 1 0 160 476 894 1947 1468 1072 1247 569 285 23 8142
1984-85 2 12 265 451 857 1376 1594 1260 836 378 124 101 7256
1985-86 5 44 269 562 1327 1721 1363 1341 865 498 204 17 8216
1986-87 0 54 180 504 1082 1227 1265 896 835 387 96 23 6549
1987-88 5 54 110 649 801 1252 1715 1448 878 554 83 1 7550
1988-89 0 22 126 628 916 1321 1219 1559 1083 514 235 61 7684
1989-90 0 5 192 481 1056 1655 1131 1117 871 586 268 39 7401
1990-91 11 7 109 527 875 1538 1587 977 859 455 192 7 7144
1991-92 6 3 180 583 1171 1200 1186 1009 871 636 187 35 7067
1992-93 35 63 159 500 1030 1414 1576 1397 1109 621 244 74 8222
1993-94 2 19 257 557 1046 1331 1821 1443 872 563 140 8 8059
1994-95 5 15 100 386 849 1332 1461 1157 931 689 281 55 7261
1995-96 3 0 198 523 1068 1275 1674 1224 1159 672 334 44 8174
1996-97 8 4 228 535 1237 1691 1738 1313 1060 727 413 7 8961
1997-98 20 26 130 497 1105 1202 1402 922 1138 549 147 117 7255
1998-99 4 2 79 440 881 1262 1574 976 961 572 208 72 7031
1999-00 0 4 199 505 686 1229 1471 997 789 565 205 80 6730
2000-01 23 8 167 425 1195 1771 1424 1501 1185 516 203 43 8461
2001- 7 7 161 522 637 1234

2001 Sioux Falls, South Dakota (FSD)

COOLING DEGREE DAYS (base 65 F) 2001 SIOUX FALLS, SD (FSD)
YEAR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANNUAL
1972 0 0 0 0 60 108 197 219 35 0 0 0 619
1973 0 0 0 0 13 143 300 370 38 8 0 0 872
1974 0 0 0 2 23 118 450 126 26 6 0 0 751
1975 0 0 0 0 44 134 428 252 36 16 0 0 910
1976 0 0 0 2 24 226 370 324 85 9 0 0 1040
1977 0 0 0 11 101 197 382 123 40 0 0 0 854
1978 0 0 0 0 32 133 202 213 163 0 0 0 743
1979 0 0 0 3 25 131 289 189 87 0 0 0 724
1980 0 0 0 23 46 153 290 207 74 6 0 0 799
1981 0 0 0 14 27 175 342 203 61 0 0 0 822
1982 0 0 0 4 12 42 298 230 45 0 0 0 631
1983 0 0 0 0 15 122 381 420 120 2 0 0 1060
1984 0 0 0 0 10 120 276 305 36 4 0 0 751
1985 0 0 0 19 59 85 212 93 72 0 0 0 540
1986 0 0 0 0 20 163 318 108 25 0 0 0 634
1987 0 0 0 20 100 219 381 178 53 0 0 0 951
1988 0 0 0 1 94 349 393 330 61 0 0 0 1228
1989 0 0 0 6 25 125 387 228 56 7 0 0 834
1990 0 0 0 31 11 198 209 258 160 7 0 0 874
1991 0 0 0 11 119 265 264 249 100 5 0 0 1013
1992 0 0 0 4 53 103 58 103 25 5 0 0 351
1993 0 0 0 0 5 85 208 223 16 9 0 0 546
1994 0 0 0 13 113 212 191 160 113 2 0 0 804
1995 0 0 0 0 0 214 324 375 68 11 0 0 992
1996 0 0 0 0 27 163 140 167 63 4 0 0 564
1997 0 0 0 0 1 128 255 152 62 20 0 0 618
1998 0 0 0 0 54 69 225 196 123 0 0 0 667
1999 0 0 0 0 14 136 319 185 48 3 0 0 705
2000 0 0 0 0 31 106 240 219 64 4 0 0 664
2001 0 0 0 14 29 163 345 237 58 8 0 0 854

2001 Sioux Falls, South Dakota (FSD)

SNOWFALL (inches) 2001 SIOUX FALLS, SD (FSD)
YEAR JUL AUG SEP OCT NOV DEC JAN FEB MAR APR MAY JUN TOTAL
1972-73 0.0 0.0 0.0 0.2 2.5 6.2 5.5 7.4 0.3 T 0.0 0.0 22.1
1973-74 0.0 0.0 0.0 T 0.1 11.6 1.9 2.9 5.1 3.3 0.0 0.0 24.9
1974-75 0.0 0.0 0.0 0.0 2.5 1.1 18.3 3.1 17.9 T 0.0 0.0 42.9
1975-76 0.0 0.0 0.0 T 13.2 2.5 6.5 6.6 7.9 T 0.1 0.0 36.8
1976-77 0.0 0.0 0.0 3.4 0.7 6.7 2.7 1.9 13.5 T 0.0 0.0 28.9
1977-78 0.0 0.0 0.0 0.9 8.6 8.0 7.6 6.5 5.5 0.6 0.0 0.0 37.7
1978-79 0.0 0.0 0.0 0.0 2.9 9.5 19.0 7.3 13.2 1.5 0.0 0.0 53.4
1979-80 0.0 0.0 0.0 T 15.2 0.3 2.9 5.5 5.8 T 0.0 0.0 29.7
1980-81 0.0 0.0 0.0 0.8 0.4 4.6 1.4 3.1 T 0.5 0.0 0.0 10.8
1981-82 0.0 0.0 0.0 0.8 8.9 5.5 16.9 1.0 1.8 7.5 0.0 0.0 42.4
1982-83 0.0 0.0 0.0 3.3 4.1 17.6 4.7 3.6 18.8 18.4 0.0 0.0 70.5
1983-84 0.0 0.0 0.0 T 19.0 13.7 5.0 11.9 19.4 6.0 0.0 0.0 75.0
1984-85 0.0 0.0 T T T 4.7 7.4 0.7 16.1 2.5 0.0 0.0 31.4
1985-86 0.0 0.0 0.9 0.2 21.9 9.1 9.1 0.9 8.2 0.3 0.0 0.0 50.6
1986-87 0.0 0.0 0.0 T 5.4 T 2.4 0.3 T T 0.0 0.0 8.1
1987-88 0.0 0.0 0.0 0.1 7.5 13.3 17.9 7.3 2.5 11.3 0.0 0.0 59.9
1988-89 0.0 0.0 0.0 T 10.9 2.2 2.0 10.0 16.0 0.7 T 0.0 41.8
1989-90 0.0 0.0 0.0 0.0 2.4 4.0 0.2 5.8 0.7 T 0.0 T 13.1
1990-91 0.0 0.0 0.0 1.2 8.4 8.8 5.4 5.4 3.2 T T T 32.4
1991-92 0.0 0.0 0.0 10.0 10.8 0.2 3.8 11.2 8.4 3.5 T T 47.9
1992-93 0.0 0.0 0.0 T 4.7 8.4 8.6 13.1 14.9 2.2 T T 51.9
1993-94 T 0.0 T T 8.8 4.6 16.8 13.0 1.1 14.9 0.0 T 59.2
1994-95 0.0 0.0 0.0 0.0 9.7 7.0 0.5 2.4 8.8 12.5 0.0 0.0 40.9
1995-96 T 0.0 0.0 7.4 5.1 1.9 15.4 1.7 6.9
1996-97 0.0 T 11.3 19.8 8.8 16.5 1.3 6.0 T 0.0
1997-98 0.0 0.0 0.0 0.4 5.0 3.3 11.7 6.9 21.4 0.3 0.0 T 49.0
1998-99 0.0 0.0 0.0 0.0 14.8 9.0 9.9 7.9 11.2 2.4 T 0.0 55.2
1999-00 T 0.0 T 2.7 T 3.2 6.0 1.2 4.5 5.6 T 0.0 23.2
2000-01 T 0.0 0.0 0.0 19.6 11.4 13.9 8.4 3.2 1.4 0.0 T 57.9
2001- 0.0 T 0.0 T 13.8 2.9
POR=55 YRS T 0.0 0.0 0.8 6.0 6.9 6.9 7.8 9.1 2.9 0.2 T 40.6



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