2001 CHEYENNE, WYOMING (CYS)



The city of Cheyenne is located on a broad plateau between the North and South Platte Rivers in the extreme southeastern corner of Wyoming at an elevation of approximately 6,100 feet. The surrounding country is mostly rolling prairie which is used primarily for grazing. The ground level rises rapidly to a ridge approximately 9,000 feet in elevation about 30 miles west of the city. This ridge is known as the Laramie Mountains, one of the ranges of the Rockies, and extends in a north–south direction. Because of this ridge, winds from the northwest through west to southwest are downslope and produce a marked chinook effect in Cheyenne which is especially noticeable during the winter months. Also, winds from the north through east to south are upslope and may cause fog or low stratus clouds in the Cheyenne area throughout the year. Because of this terrain variation, the wind direction plays an important role in controlling the local temperature and weather.

Cheyenne experiences large diurnal and annual temperature ranges. This is due to the advent of both warm and cold air masses and the relatively high elevation of the city which permits rapid incoming and outgoing radiation. The daily temperature range averages about 30 degrees in the summer and 23 degrees in the winter. Many cold air masses from the north during the winter months miss Cheyenne. Because of the downslope of land to the east and the prevailing westerlies, some of the cold air masses do move over the city, but only about 13 percent of the days in an average January, the coldest month of the year, show temperatures dropping to zero or below. Temperatures during the winter months average a few degrees higher than over the Mississippi and Missouri Valleys at the same latitude.

Windy days are quire frequent during the winter and spring months. Since the wind is usually strongest during the daytime it is a very noticeable weather element. Usually the strong winds are from a westerly direction and this tends to raise the temperature because the air is moving downslope.

Most of the air masses reaching this area move in from the Pacific and since the mountains to the west are quite effective moisture barriers the climate is semi–arid. Fortunately, about 70 percent of normal annual precipitation occurs during the growing season. In the summer months, precipitation is mostly of the shower type and occurs mainly with thunderstorms. Hail is frequent and occasionally destructive in some thunderstorms. Most of the snow falls during the late winter and early spring months. It is not uncommon to have heavy snow in May.

The growing season in Cheyenne averages about 132 days a year and extends from around May 18th to September 27th. Freezing temperatures have occurred as late in the spring as mid–June, and as early in the fall as late August.

Relative humidity averages near 50 percent on an annual basis with large daily variations. Very seldom is the relative humidity above 30 percent when the temperature is above 80 degrees.

NORMALS, MEANS, AND EXTREMES

CHEYENNE, WY (CYS)

LATITUDE: LONGITUDE: ELEVATION (FT): TIME ZONE: WBAN: 24018

41 09′ 28″ N  104 48′ 25″ W GRND: 6125 BARO: 6128 MOUNTAIN (UTC + 7)

2001 Cheyenne, Wyoming (CYS)

ELEMENT POR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC YEAR
TEMPERATURE F NORMAL DAILY MAXIMUM 30 37.7 40.5 44.9 54.7 64.6 74.4 82.2 80.0 71.1 60.0 46.8 38.8 58.0
MEAN DAILY MAXIMUM 54 37.9 40.6 44.9 54.3 64.5 75.1 81.1 79.4 70.5 59.2 45.5 39.0 57.7
HIGHEST DAILY MAXIMUM 66 66 71 74 83 91 100 100 96 95 83 75 69 100
YEAR OF OCCURRENCE 1982 1962 1986 1992 2000 1954 1939 1979 1995 1992 1999 1939 JUN 1954
MEAN OF EXTREME MAXS. 54 56.9 59.1 65.1 73.9 81.3 89.2 91.1 89.3 84.7 76.4 64.7 57.6 74.1
NORMAL DAILY MINIMUM 30 15.2 18.1 22.1 30.1 39.4 48.3 54.6 52.8 43.7 33.9 23.7 16.7 33.2
MEAN DAILY MINIMUM 54 15.4 18.1 21.8 29.9 39.6 48.4 53.5 52.2 43.1 33.1 22.9 17.1 32.9
LOWEST DAILY MINIMUM 66 -29 -34 -21 -8 16 25 38 36 8 -1 -16 -28 -34
YEAR OF OCCURRENCE 1984 1936 1943 1975 1947 1951 1952 1975 1985 1991 1993 1990 FEB 1936
MEAN OF EXTREME MINS. 54 -8.8 -3.9 2.0 14.0 27.7 37.7 45.0 43.6 29.6 17.3 2.7 -5.4 16.8
NORMAL DRY BULB 30 26.5 29.3 33.6 42.5 52.0 61.3 68.4 66.4 57.4 47.0 35.2 27.8 45.6
MEAN DRY BULB 54 26.7 29.3 33.4 42.1 52.1 61.6 67.3 65.8 56.8 46.0 34.2 28.0 45.3
MEAN WET BULB 18 22.8 23.7 29.4 35.2 44.6 51.8 52.9 52.6 44.6 35.5 26.2 21.4 36.7
MEAN DEW POINT 18 12.9 14.8 20.1 26.2 36.3 43.4 44.3 44.7 35.8 26.0 17.3 12.1 27.8
NORMAL NO. DAYS WITH:
MAXIMUM 90 30 0.0 0.0 0.0 0.0 * 1.3 5.2 2.1 0.1 0.0 0.0 0.0 8.7
MAXIMUM 32 30 9.3 7.0 5.4 1.4 * 0.0 0.0 0.0 0.2 0.7 4.1 8.9 37.0
MINIMUM 32 30 28.8 26.1 27.7 18.0 3.6 0.0 0.0 0.0 2.1 12.2 24.4 28.5 171.4
MINIMUM 0 30 4.4 2.5 1.0 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.5 3.4 11.9
H/C NORMAL HEATING DEG. DAYS 30 1194 1000 973 675 403 150 31 44 251 558 894 1153 7326
NORMAL COOLING DEG. DAYS 30 0 0 0 0 0 39 136 87 23 0 0 0 285
RH NORMAL (PERCENT) 30 52 55 56 54 56 54 51 51 52 50 54 54 53
HOUR 05 LST 30 57 61 65 68 71 71 70 69 67 61 60 58 65
HOUR 11 LST 30 45 46 46 43 42 40 36 36 38 38 43 46 42
HOUR 17 LST 30 49 48 47 42 44 41 38 38 38 41 50 52 44
HOUR 23 LST 30 58 61 64 65 67 64 63 63 62 59 60 59 62
S PERCENT POSSIBLE SUNSHINE 62 64 67 67 63 61 67 69 68 70 69 61 60 66
W/O MEAN NO. DAYS WITH:
HEAVY FOG(VISBY 1/4 MI) 67 1.0 1.9 3.2 3.3 3.0 1.9 1.2 1.4 1.9 2.0 1.9 1.4 24.1
THUNDERSTORMS 67 0.0 0.0 0.2 2.1 7.8 11.3 13.2 10.5 4.5 0.9 0.0 0.0 50.5
CLOUDINESS MEAN:
SUNRISE-SUNSET (OKTAS) 1 4.8 6.4 7.2 4.0 4.0
MIDNIGHT-MIDNIGHT (OKTAS) 1 7.2 4.0
MEAN NO. DAYS WITH:
CLEAR 1 4.0 7.0 5.0 4.0 13.0
PARTLY CLOUDY 1 3.0 6.0 5.0 12.0 8.0
CLOUDY 1 3.0 4.0 11.0 13.0 7.0
PR MEAN STATION PRESSURE(IN) 29 23.90 23.89 23.80 23.90 23.90 24.00 24.11 24.11 24.10 24.01 23.91 23.91 23.96
MEAN SEA-LEVEL PRES. (IN) 18 30.06 30.04 29.97 29.92 29.88 29.98 29.96 29.99 30.00 30.03 30.03 30.08 29.99
WINDS MEAN SPEED (MPH) 44 15.2 14.7 14.4 14.1 12.6 11.4 10.4 10.4 11.2 12.3 13.5 14.6 12.9
PREVAIL. DIR (TENS OF DEGS) 22 28 29 28 28 28 28 28 28 28 28 28 28 28
MAXIMUM 2-MINUTE:
SPEED (MPH) 6 55 59 48 55 44 51 46 56 48 53 59 63 63
DIR. (TENS OF DEGS) 25 27 28 30 28 27 20 25 28 26 27 27 27
YEAR OF OCCURRENCE 2000 1999 1999 1999 1997 1998 2001 1996 2000 2001 1999 1998 DEC 1998
MAXIMUM 5-SECOND:
SPEED (MPH) 6 64 71 60 69 55 61 59 60 60 63 68 75 75
DIR. (TENS OF DEGS) 26 27 29 32 25 28 32 25 22 26 27 26 26
YEAR OF OCCURRENCE 1999 1999 2000 1999 1999 2001 1996 1996 2000 2001 1999 1998 DEC 1998
PRECIPITATION NORMAL (IN) 30 0.40 0.39 1.03 1.37 2.39 2.08 2.09 1.69 1.27 0.74 0.53 0.42 14.40
MAXIMUM MONTHLY (IN) 66 2.78 2.16 3.65 5.04 6.00 5.32 5.01 6.64 4.52 3.57 2.48 1.68 6.64
YEAR OF OCCURRENCE 1949 1953 1990 1942 1995 1955 1973 1985 1973 1942 1979 1937 AUG 1985
MINIMUM MONTHLY (IN) 66 T T 0.12 0.34 0.11 0.07 0.58 0.03 0.01 0.03 T 0.03 T
YEAR OF OCCURRENCE 1952 1983 1966 1992 1974 1980 1969 1944 1992 1964 1965 1959 FEB 1983
MAXIMUM IN 24 HOURS (IN) 66 1.41 1.60 1.88 1.94 2.07 2.68 3.42 6.06 2.75 1.70 1.66 1.19 6.06
YEAR OF OCCURRENCE 1949 1953 1946 1984 1991 1955 1973 1985 1973 1947 1979 1979 AUG 1985
NORMAL NO. DAYS WITH:
PRECIPITATION 0.01 30 5.1 6.0 9.2 9.3 11.3 10.2 10.8 9.6 7.5 5.6 6.0 6.0 96.6
PRECIPITATION 1.00 30 * 0.0 0.0 0.1 0.4 0.2 0.2 0.1 0.2 0.0 * * 1.2
SNOWFALL NORMAL (IN) 30 6.0 5.4 12.4 7.9 3.0 T 0.0 0.0 0.8 4.1 6.4 6.5 52.5
MAXIMUM MONTHLY (IN) 66 35.5 23.3 39.2 31.8 30.4 8.7 1.0 0.5 11.8 21.3 31.1 21.3 39.2
YEAR OF OCCURRENCE 1980 1995 1990 1984 1943 1947 1994 1993 2000 1969 1979 1958 MAR 1990
MAXIMUM IN 24 HOURS (IN) 66 12.7 14.0 15.6 17.4 15.0 8.7 1.0 0.5 10.1 8.6 19.8 11.7 19.8
YEAR OF OCCURRENCE 1992 1953 1973 1984 1942 1947 1994 1993 2000 1990 1979 1979 NOV 1979
MAXIMUM SNOW DEPTH (IN) 53 23 12 19 15 12 0 0 0 8 10 26 17 26
YEAR OF OCCURRENCE 1980 1989 1990 1984 1978 2000 1990 1979 1979 NOV 1979
NORMAL NO. DAYS WITH:
SNOWFALL 1.0 30 1.9 1.7 3.6 2.1 0.7 0.0 0.0 0.0 0.3 1.3 2.0 2.0 15.6

2001 Cheyenne, Wyoming (CYS)

PRECIPITATION (inches) 2001 CHEYENNE, WY (CYS)
YEAR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANNUAL
1972 0.36 0.02 0.79 0.80 2.76 1.71 1.35 1.83 1.01 0.42 0.59 0.40 12.04
1973 0.23 0.07 1.85 1.75 0.31 1.20 5.01 0.27 4.52 0.06 1.25 1.06 17.58
1974 0.48 0.03 1.24 0.50 0.11 2.81 1.41 1.29 0.50 0.91 0.49 0.10 9.87
1975 0.40 0.17 1.17 0.47 2.27 1.49 2.62 0.39 0.52 0.49 0.20 0.52 10.71
1976 0.32 0.71 0.32 1.79 2.07 0.68 2.39 1.40 0.77 0.15 0.28 0.10 10.98
1977 0.14 0.08 1.21 1.86 2.50 2.44 3.49 1.07 0.19 0.08 0.35 0.24 13.65
1978 0.58 0.78 0.35 0.52 3.98 0.63 0.98 1.38 0.12 0.50 0.45 0.54 10.81
1979 0.27 0.14 1.34 0.77 2.90 3.32 1.83 1.86 0.32 0.46 2.48 1.50 17.19
1980 2.71 0.73 1.36 0.93 2.39 0.07 2.00 1.55 0.97 0.51 0.46 0.08 13.76
1981 0.30 0.20 0.70 0.73 5.67 1.66 2.85 2.90 0.31 0.85 0.09 0.45 16.71
1982 0.41 0.19 0.17 0.53 3.56 4.52 2.71 1.81 2.87 1.20 0.43 0.83 19.23
1983 0.02 T 2.96 4.45 2.31 2.81 2.12 1.95 0.78 0.49 2.34 0.46 20.69
1984 0.54 0.84 1.28 3.71 0.78 2.43 2.57 2.84 0.65 1.55 0.11 0.34 17.64
1985 0.66 0.19 0.36 1.10 1.05 1.59 3.99 6.64 1.78 0.94 0.84 0.80 19.94
1986 0.13 0.50 0.54 2.26 1.03 2.42 1.04 1.55 2.47 1.78 0.66 0.18 14.56
1987 0.09 0.90 1.25 0.68 4.43 1.80 2.04 1.23 0.93 0.33 0.76 0.85 15.29
1988 0.52 0.65 1.34 1.84 3.09 2.03 1.79 1.79 1.66 0.09 0.42 0.53 15.75
1989 0.27 1.26 0.49 0.48 1.37 2.51 1.70 1.79 1.62 0.41 0.14 0.69 12.73
1990 0.35 0.69 3.65 1.66 3.37 1.03 3.64 1.98 0.80 1.35 0.72 0.39 19.63
1991 0.36 0.12 0.43 1.15 3.84 4.56 3.39 1.49 1.87 0.44 0.87 0.13 18.65
1992 1.18 0.11 1.75 0.34 1.86 2.11 1.87 1.90 0.01 0.46 1.69 0.49 13.77
1993 0.35 0.81 0.63 2.49 1.92 3.32 0.64 2.21 3.16 1.85 1.23 0.30 18.91
1994 0.66 0.88 0.55 1.45 2.05 1.44 2.13 1.49 0.38 1.55 0.34 0.57 13.49
1995 0.12 1.02 0.19 1.49 6.00 4.58 1.08 0.89 3.39 0.78 0.37 0.18 20.09
1996 0.50 0.07 1.50 1.51 2.24 1.79 3.10 1.79 2.34 0.50 0.45 0.01 15.80
1997 0.39 0.31 0.44 1.68 2.47 3.48 2.80 4.33 2.06 1.09 0.20 0.59 19.84
1998 0.07 0.29 0.69 1.09 2.35 1.63 1.21 0.96 0.49 1.27 0.31 0.46 10.82
1999 0.35 0.13 0.46 5.02 2.04 2.13 2.38 0.78 2.11 0.27 0.25 0.19 16.11
2000 0.35 0.59 1.48 0.58 1.38 0.46 2.64 1.87 2.64 0.69 0.30 0.75 13.73
2001 0.41 0.33 0.56 2.49 2.24 1.45 3.31 0.74 1.18 0.40 0.23 0.13 13.47
POR=130 YRS 0.43 0.55 1.05 1.76 2.46 1.88 2.03 1.52 1.24 0.80 0.50 0.41 14.63

2001 Cheyenne, Wyoming (CYS)

AVERAGE TEMPERATURE (F) 2001 CHEYENNE, WY (CYS)
YEAR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANNUAL
1972 25.3 33.2 39.3 42.5 51.2 63.2 64.3 64.6 56.6 45.5 29.5 21.0 44.7
1973 23.7 29.7 31.9 37.3 51.4 62.9 65.8 68.4 54.1 49.3 35.3 29.4 44.9
1974 24.1 31.9 37.1 43.3 55.0 64.1 70.1 65.2 55.3 48.3 35.6 26.6 46.4
1975 25.5 25.0 30.2 37.5 48.4 57.9 67.3 66.3 56.0 48.1 34.2 32.6 44.1
1976 26.9 32.9 30.9 42.7 51.1 59.7 69.2 65.0 57.7 43.4 33.5 30.6 45.3
1977 22.4 32.9 32.1 44.7 53.4 65.2 68.2 63.5 60.7 48.3 34.4 29.0 46.2
1978 22.1 25.0 37.7 43.9 49.0 61.0 68.7 64.3 59.6 47.9 33.5 21.1 44.5
1979 17.3 31.6 36.0 44.9 49.9 61.5 69.9 65.9 62.9 49.8 29.5 32.9 46.0
1980 22.2 29.4 33.0 42.3 51.2 65.5 71.4 66.5 60.4 46.7 36.8 38.5 47.0
1981 33.4 32.2 36.8 50.1 50.5 63.7 69.0 65.2 61.2 46.1 40.7 30.7 48.3
1982 25.5 28.2 36.1 41.8 50.5 57.5 67.7 69.1 56.7 45.1 31.4 28.3 44.8
1983 32.8 33.5 32.0 34.8 47.4 57.3 67.8 70.2 59.0 48.6 32.3 15.0 44.2
1984 24.3 28.4 32.4 35.7 53.6 59.4 68.4 66.6 53.0 40.0 35.0 27.0 43.7
1985 19.5 23.3 35.2 45.6 54.3 61.1 69.3 66.8 52.8 45.1 26.2 26.1 43.8
1986 37.0 30.1 42.2 43.9 50.6 64.5 68.5 67.0 55.3 44.6 34.3 28.7 47.2
1987 29.1 31.6 32.4 46.7 54.5 63.3 69.2 64.9 58.0 46.9 36.7 25.7 46.6
1988 21.5 28.4 32.3 44.4 53.3 67.4 69.7 68.7 57.5 50.3 35.3 28.7 46.5
1989 30.2 17.3 37.4 44.3 54.3 60.3 70.6 67.0 57.5 46.5 38.7 24.3 45.7
1990 31.5 28.7 31.9 42.8 49.3 64.1 65.0 66.4 62.2 46.7 38.7 20.8 45.7
1991 25.0 36.2 36.4 41.1 52.4 62.5 67.7 67.7 58.0 46.1 31.7 31.6 46.4
1992 30.5 36.7 38.6 48.6 55.0 60.8 64.6 63.8 60.0 49.2 30.9 25.5 47.0
1993 26.1 24.9 37.2 42.1 53.4 58.7 66.1 64.8 54.3 44.1 29.2 30.7 44.3
1994 29.4 27.2 38.6 43.3 56.9 66.3 68.0 69.4 61.7 46.9 34.6 33.3 48.0
1995 30.7 32.6 36.8 39.5 45.7 59.0 67.8 71.6 57.1 45.8 38.4 30.0 46.3
1996 23.0 30.2 31.6 42.7 51.7 63.6 68.3 66.3 56.6 45.8 34.7 30.1 45.4
1997 24.7 26.7 38.3 35.9 51.7 62.6 68.3 65.0 59.2 46.1 31.4 28.3 44.9
1998 30.6 30.6 32.7 41.2 53.3 56.8 70.3 68.7 64.0 45.8 39.5 26.6 46.7
1999 30.8 34.6 37.6 38.4 50.5 60.3 70.0 67.7 54.0 47.6 44.0 32.0 47.3
2000 29.8 34.7 37.1 45.4 55.5 62.5 72.2 70.5 58.2 46.3 25.9 25.3 47.0
2001 27.6 26.9 35.1 44.3 52.6 64.2 72.2 69.5 61.5 47.2 38.9 29.2 47.4
POR=128 YRS 26.2 28.1 32.8 41.6 51.1 61.1 67.8 66.4 57.5 46.4 35.0 28.4 45.2

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 Cheyenne, Wyoming (CYS)

HEATING DEGREE DAYS (base 65 F) 2001 CHEYENNE, WY (CYS)
YEAR JUL AUG SEP OCT NOV DEC JAN FEB MAR APR MAY JUN TOTAL
1972-73 85 75 248 599 1056 1358 1275 980 1017 824 414 122 8053
1973-74 80 4 323 482 883 1098 1264 922 862 643 304 110 6975
1974-75 4 55 302 509 873 1180 1215 1115 1070 819 506 212 7860
1975-76 11 39 274 515 920 998 1175 924 1048 661 425 158 7148
1976-77 11 44 224 664 937 1059 1314 894 1014 602 352 44 7159
1977-78 21 74 150 511 910 1108 1324 1115 840 627 491 157 7328
1978-79 28 73 200 523 937 1358 1471 933 893 597 459 139 7611
1979-80 2 62 105 468 1058 990 1321 1027 984 673 424 65 7179
1980-81 0 41 151 558 840 812 974 913 868 440 445 95 6137
1981-82 21 50 120 580 722 1058 1216 1025 892 687 446 227 7044
1982-83 29 7 264 608 1002 1131 992 875 1016 898 538 233 7593
1983-84 23 0 202 502 974 1547 1259 1058 1002 870 348 177 7962
1984-85 6 15 365 769 892 1171 1403 1163 917 576 323 162 7762
1985-86 11 37 364 612 1158 1199 862 970 698 629 440 71 7051
1986-87 4 20 286 630 914 1121 1102 928 1002 542 321 78 6948
1987-88 27 79 214 554 841 1213 1343 1056 1008 611 361 42 7349
1988-89 12 18 236 449 884 1116 1075 1332 851 615 334 180 7102
1989-90 4 18 236 566 779 1257 1037 1012 1021 662 480 106 7178
1990-91 75 28 127 558 784 1364 1231 799 879 712 385 95 7037
1991-92 26 17 217 586 993 1031 1062 813 811 488 307 131 6482
1992-93 63 92 161 484 1014 1216 1198 1118 856 680 351 202 7435
1993-94 45 58 322 642 1068 1059 1097 1053 809 644 249 43 7089
1994-95 24 16 131 552 904 978 1057 901 866 758 588 199 6974
1995-96 37 6 283 589 793 1076 1293 1002 1031 663 411 77 7261
1996-97 16 29 269 590 905 1076 1242 1065 820 867 400 102 7381
1997-98 34 58 181 577 1001 1130 1059 957 994 706 352 256 7305
1998-99 7 10 104 587 754 1183 1055 845 840 791 444 150 6770
1999-00 8 27 322 534 625 1015 1083 870 858 581 305 130 6358
2000-01 2 8 242 573 1167 1223 1155 1064 922 614 377 106 7453
2001- 0 11 135 545 776 1102

2001 Cheyenne, Wyoming (CYS)

COOLING DEGREE DAYS (base 65 F) 2001 CHEYENNE, WY (CYS)
YEAR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANNUAL
1972 0 0 0 0 0 11 69 69 2 0 0 0 151
1973 0 0 0 0 0 65 112 116 0 0 0 0 293
1974 0 0 0 0 4 88 173 67 17 0 0 0 349
1975 0 0 0 0 0 7 90 86 10 0 0 0 193
1976 0 0 0 0 0 7 145 50 15 0 0 0 217
1977 0 0 0 0 0 59 126 38 29 0 0 0 252
1978 0 0 0 0 1 43 150 59 44 0 0 0 297
1979 0 0 0 0 1 42 160 100 49 0 0 0 352
1980 0 0 0 0 0 88 205 94 21 0 0 0 408
1981 0 0 0 0 0 59 156 64 15 0 0 0 294
1982 0 0 0 0 0 8 120 140 21 0 0 0 289
1983 0 0 0 0 0 10 115 169 28 0 0 0 322
1984 0 0 0 0 1 14 118 72 8 0 0 0 213
1985 0 0 0 0 0 52 150 98 8 0 0 0 308
1986 0 0 0 0 0 62 118 89 0 0 0 0 269
1987 0 0 0 0 0 35 164 83 9 0 0 0 291
1988 0 0 0 0 4 122 166 140 18 0 0 0 450
1989 0 0 0 0 7 46 188 86 19 0 0 0 346
1990 0 0 0 0 0 86 84 79 49 0 0 0 298
1991 0 0 0 0 2 28 119 106 13 4 0 0 272
1992 0 0 0 1 2 15 58 63 16 0 0 0 155
1993 0 0 0 0 0 19 89 60 6 0 0 0 174
1994 0 0 0 0 3 91 125 156 38 0 0 0 413
1995 0 0 0 0 0 23 132 218 50 0 0 0 423
1996 0 0 0 0 2 40 124 73 24 0 0 0 263
1997 0 0 0 0 0 37 144 65 13 0 0 0 259
1998 0 0 0 0 0 17 182 131 78 0 0 0 408
1999 0 0 0 0 0 18 170 114 0 0 0 0 302
2000 0 0 0 0 19 59 231 187 44 0 0 0 540
2001 0 0 0 0 0 91 229 158 38 0 0 0 516

2001 Cheyenne, Wyoming (CYS)

SNOWFALL (inches) 2001 CHEYENNE, WY (CYS)
YEAR JUL AUG SEP OCT NOV DEC JAN FEB MAR APR MAY JUN TOTAL
1972-73 0.0 0.0 T 5.0 8.8 7.6 4.6 0.6 27.0 12.8 1.2 0.0 67.6
1973-74 0.0 0.0 T 0.5 17.4 13.9 5.0 0.8 16.3 8.0 0.0 0.0 61.9
1974-75 0.0 0.0 1.9 1.4 2.4 1.5 5.8 4.3 14.0 5.4 0.8 0.0 37.5
1975-76 0.0 0.0 0.6 5.5 4.7 8.4 6.0 8.5 9.0 6.7 T T 49.4
1976-77 0.0 0.0 0.0 1.5 3.5 1.2 2.5 0.8 12.9 7.0 T 0.0 29.4
1977-78 0.0 0.0 0.0 0.4 4.3 5.6 7.0 12.0 2.5 1.0 18.3 0.0 51.1
1978-79 0.0 0.0 0.1 2.0 9.3 17.6 6.7 2.2 21.1 4.0 14.1 T 77.1
1979-80 0.0 0.0 0.0 3.6 31.1 15.6 35.5 10.7 17.8 3.4 3.8 0.0 121.5
1980-81 0.0 0.0 0.0 1.1 6.3 2.1 3.4 2.9 9.0 2.0 0.8 0.0 27.6
1981-82 0.0 0.0 0.0 4.6 0.8 5.8 5.6 2.4 1.7 2.0 4.0 0.0 26.9
1982-83 0.0 0.0 0.0 12.2 7.9 13.1 0.1 T 31.9 25.7 10.1 0.0 101.0
1983-84 0.0 0.0 T 0.2 27.2 7.0 7.9 12.1 13.0 31.8 T 0.0 99.2
1984-85 0.0 0.0 1.6 3.8 1.5 5.6 9.8 1.9 3.6 2.6 0.4 0.0 30.8
1985-86 0.0 0.0 7.4 6.0 12.4 13.0 1.3 4.9 5.6 11.3 3.8 0.0 65.7
1986-87 0.0 0.0 0.0 9.2 6.9 2.2 1.1 9.9 13.7 4.4 T 0.0 47.4
1987-88 0.0 0.0 0.0 1.3 4.5 16.1 9.0 7.5 16.0 7.5 2.2 0.0 64.1
1988-89 0.0 0.0 0.2 0.0 4.5 7.2 4.4 17.6 5.0 4.3 T T 43.2
1989-90 T T 2.6 3.4 1.9 9.7 5.6 11.6 39.2 5.6 1.3 T 80.9
1990-91 T T T 12.3 8.8 6.6 7.7 1.6 3.7 10.5 T T 51.2
1991-92 T T T 7.5 9.1 2.0 18.2 0.8 11.3 0.7 4.4 0.5 54.5
1992-93 T T 0.0 2.1 25.5 10.9 7.1 14.6 6.6 11.3 T 0.5 78.6
1993-94 0.0 0.5 5.5 3.1 18.0 5.7 11.5 16.1 4.2 9.1 T T 73.7
1994-95 1.0 0.0 0.9 2.3 3.0 10.0 2.7 23.3 4.4 13.2 2.6 T 63.4
1995-96 0.0 0.0 3.0 6.4 6.4 3.6 11.9 2.1 21.9 8.7 0.1 T 64.1
1996-97 T T 1.2 2.0 7.0 0.4 10.5 7.9 8.4 23.3 2.8 T 63.5
1997-98 T T T 8.8 2.5 10.9 1.3 3.4 8.4 10.1 1.1 0.7 47.2
1998-99 T 0.0 0.0 0.3 4.0 13.5 6.4 2.4 4.9 17.0 0.9 T 49.4
1999-00 0.0 0.0 3.7 3.3 4.3 2.9 2.9 10.7 16.2 1.7 0.2 0.0 45.9
2000-01 T T 11.8 0.7 4.3 13.5 8.6 6.8 7.0 23.2 13.1 T 89.0
2001- T 0.0 T 2.6 4.3 2.1
POR=65 YRS 0.0 0.0 1.1 3.7 7.1 6.3 6.4 6.3 11.5 9.3 3.5 0.2 55.4



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