2001 GRAND JUNCTION, COLORADO (GJT)



Grand Junction is located at the junction of the Colorado and Gunnison Rivers. It is on the west slope of the Rockies, in a large mountain valley. The area has a climate marked by the wide seasonal range usual to interior localities at this latitude. Thanks, however, to the protective topography of the vicinity, sudden and severe weather changes are very infrequent. The valley floor slopes from 4,800 feet near Palisade to 4,400 feet at the west end near Fruita. Mountains are on all sides at distances of from 10 to 60 miles and reach heights of 9,000 to over 12,000 feet.

This mountain valley location, with attendant valley breezes, provides protection from spring and fall frosts. This results in a growing season averaging 191 days in the city. This varies considerably in the outlying districts. It is about the same in the upper valley around Palisade, and 3 to 4 weeks shorter near the river west of Grand Junction. The growing season is sufficiently long to permit commercial growth of almost all fruits except citrus varieties. Summer grazing of cattle and sheep on nearby mountain ranges is extensive.

The interior, continental location, ringed by mountains on all sides, results in quite low precipitation in all seasons. Consequently, agriculture is dependent on irrigation. Adequate supplies of water are available from mountain snows and rains. Summer rains occur chiefly as scattered light showers and thunderstorms which develop over nearby mountains. Winter snows are fairly frequent, but are mostly light and quick to melt. Even the infrequent snows of from 4 to 8 inches seldom remain on the ground for prolonged periods. Blizzard conditions in the valley are extremely rare.

Temperatures above 100 degrees are infrequent, and about one–third of the winters have no readings below zero. Summer days with maximum temperatures in the middle 90s and minimums in the low 60s are common. Relative humidity is very low during the summer, with values similar to other dry locations such as the southern parts of New Mexico and Arizona. Spells of cold winter weather are sometimes prolonged due to cold air becoming trapped in the valley. Winds are usually very light during the coldest weather. Changes in winter are normally gradual, and abrupt changes are much less frequent than in eastern Colorado. Cold waves are rare. Sunny days predominate in all seasons.

The prevailing wind is from the east–southeast due to the valley breeze effect. The strongest winds are associated with thunderstorms or with pre–frontal weather. They usually are from the south or southwest.

NORMALS, MEANS, AND EXTREMES

GRAND JUNCTION, CO (GJT)

LATITUDE:    LONGITUDE:     ELEVATION (FT):    TIME ZONE:    WBAN: 23066

39 08′ 03″ N  108 32′ 15″ W  GRND: 4823  BARO: 4826  MOUNTAIN (UTC + 7)

2001 Grand Junction, Colorado (GJT)

ELEMENT POR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC YEAR
TEMPERATURE F NORMAL DAILY MAXIMUM 30 35.5 45.4 55.6 65.8 76.0 87.7 93.6 90.5 81.1 67.7 51.4 38.7 65.8
MEAN DAILY MAXIMUM 54 36.4 44.8 54.8 65.0 75.8 87.3 93.1 89.8 81.1 67.8 50.6 39.1 65.5
HIGHEST DAILY MAXIMUM 55 60 68 81 89 101 105 105 103 100 88 75 64 105
YEAR OF OCCURRENCE 1971 1986 1971 1992 2000 1990 1976 2000 1995 1963 1977 1980 JUN 1990
MEAN OF EXTREME MAXS. 54 49.3 58.5 70.7 80.5 89.4 98.4 100.8 98.1 92.6 81.6 65.1 52.5 78.1
NORMAL DAILY MINIMUM 30 14.5 23.5 31.3 38.5 47.9 57.1 63.9 62.2 52.8 41.6 29.4 18.7 40.1
MEAN DAILY MINIMUM 54 16.4 23.3 30.9 38.7 48.0 57.0 63.8 61.8 52.9 41.1 28.5 19.0 40.1
LOWEST DAILY MINIMUM 55 -23 -18 5 11 26 34 44 43 29 18 -2 -17 -23
YEAR OF OCCURRENCE 1963 1989 1948 1975 1970 1976 1993 1968 1978 1993 1976 1990 JAN 1963
MEAN OF EXTREME MINS. 54 1.5 8.0 17.7 25.5 34.7 44.4 55.5 53.2 40.2 28.2 15.2 5.2 27.4
NORMAL DRY BULB 30 25.0 34.5 43.4 52.2 62.0 72.4 78.8 76.4 67.0 54.7 40.4 28.7 53.0
MEAN DRY BULB 54 26.4 34.0 42.8 51.8 61.8 72.2 78.4 75.8 67.0 54.4 39.7 28.9 52.8
MEAN WET BULB 18 24.0 30.2 36.2 41.3 48.1 53.4 58.6 58.8 51.4 42.7 32.8 25.2 41.9
MEAN DEW POINT 18 18.2 22.7 24.9 27.9 33.1 35.6 43.7 46.1 37.7 30.3 24.2 18.8 30.3
NORMAL NO. DAYS WITH:
MAXIMUM 90 30 0.0 0.0 0.0 0.0 1.2 14.3 24.8 19.4 4.2 0.0 0.0 0.0 63.9
MAXIMUM 32 30 11.7 2.3 0.2 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.6 7.2 22.0
MINIMUM 32 30 30.3 24.7 17.1 6.6 0.4 0.0 0.0 0.0 0.1 2.9 20.2 29.5 131.8
MINIMUM 0 30 4.0 0.6 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 * 1.4 6.0
H/C NORMAL HEATING DEG. DAYS 30 1240 854 670 389 132 13 0 0 55 332 738 1125 5548
NORMAL COOLING DEG. DAYS 30 0 0 0 0 39 235 428 353 115 13 0 0 1183
RH NORMAL (PERCENT) 30 70 60 50 40 36 29 34 37 39 46 58 68 47
HOUR 05 LST 30 77 71 63 55 51 44 48 51 52 58 70 76 60
HOUR 11 LST 30 64 53 42 33 30 24 28 32 34 38 50 61 41
HOUR 17 LST 30 61 47 36 27 24 19 22 24 26 33 46 59 35
HOUR 23 LST 30 75 66 56 45 40 32 36 39 42 51 64 73 52
S PERCENT POSSIBLE SUNSHINE 55 61 65 65 70 73 81 79 77 79 74 63 61 71
W/O MEAN NO. DAYS WITH:
HEAVY FOG (VISBY 1/4 MI) 56 2.7 1.8 0.6 0.1 0.0 0.0 0.0 0.0 0.0 0.2 0.8 2.0 8.2
THUNDERSTORMS 56 0.1 0.3 0.8 2.1 4.8 4.8 7.6 8.2 5.3 1.5 0.4 0.1 36.0
CLOUDINESS MEAN:
SUNRISE-SUNSET (OKTAS) 50 4.9 5.0 5.0 4.8 4.4 3.2 3.3 3.4 2.9 3.4 4.2 4.5 4.1
MIDNIGHT-MIDNIGHT (OKTAS) 32 4.6 4.4 4.6 4.3 4.0 3.0 3.2 3.3 2.7 3.2 4.0 4.3 3.8
MEAN NO. DAYS WITH:
CLEAR 51 9.1 7.6 8.0 7.9 9.6 14.9 13.7 13.1 16.0 14.7 10.4 9.6 134.6
PARTLY CLOUDY 51 7.0 7.4 8.6 9.4 10.7 9.4 11.2 11.2 8.1 7.6 7.4 7.6 105.6
CLOUDY 51 14.8 13.3 14.4 12.7 10.7 5.7 5.5 6.1 5.3 8.0 11.6 13.1 121.2
PR MEAN STATION PRESSURE (IN) 29 25.20 25.19 25.10 25.10 25.10 25.10 25.20 25.20 25.20 25.20 25.21 25.30 25.17
MEAN SEA-LEVEL PRES. (IN) 18 30.23 30.10 29.97 29.89 29.83 29.81 29.87 29.91 29.94 30.03 30.12 30.22 29.99
WINDS MEAN SPEED (MPH) 55 5.8 6.7 8.4 9.4 9.6 9.8 9.6 9.3 9.2 8.1 6.9 6.1 8.2
PREVAIL. DIR (TENS OF DEGS)
MAXIMUM 2-MINUTE:
SPEED (MPH) 5 36 41 53 49 44 48 41 45 38 44 37 35 53
DIR. (TENS OF DEGS) 25 20 34 27 25 30 15 24 30 21 13 31 34
YEAR OF OCCURRENCE 1999 1998 2001 2000 2000 1999 2000 1999 2000 1997 1997 2000 MAR 2001
MAXIMUM 5-SECOND:
SPEED (MPH) 5 45 55 60 60 54 55 52 64 48 54 45 43 64
DIR. (TENS OF DEGS) 23 19 34 19 25 31 15 26 29 22 26 31 26
YEAR OF OCCURRENCE 1999 1998 2001 2000 2000 1999 2000 1999 2001 1997 1999 2000 AUG 1999
PRECIPITATION NORMAL (IN) 30 0.56 0.48 0.90 0.75 0.87 0.50 0.65 0.81 0.82 0.98 0.71 0.61 8.64
MAXIMUM MONTHLY (IN) 55 2.46 1.56 2.02 2.15 2.04 2.07 1.92 3.48 2.84 3.45 2.00 1.89 3.48
YEAR OF OCCURRENCE 1957 1948 1979 1997 1995 1969 1983 1957 1997 1972 1983 1951 AUG 1957
MINIMUM MONTHLY (IN) 55 T T 0.02 0.06 T T 0.01 0.04 0.00 0.01 0.00
YEAR OF OCCURRENCE 1961 1972 1972 1958 1970 1980 1994 1956 1952 1976 OCT 1952
MAXIMUM IN 24 HOURS (IN) 55 0.72 0.81 1.15 1.33 1.13 1.57 1.42 1.68 1.35 1.24 0.83 1.16 1.68
YEAR OF OCCURRENCE 2000 1996 1993 1965 1983 1969 1974 1997 1965 1957 1983 1951 AUG 1997
NORMAL NO. DAYS WITH:
PRECIPITATION 0.01 30 6.4 5.2 7.7 6.6 6.3 4.2 5.8 6.1 6.3 5.6 5.6 6.4 72.2
PRECIPITATION 1.00 30 0.0 0.0 0.0 0.0 0.0 * * 0.0 * 0.0 0.0 0.0 0.0
SNOWFALL NORMAL (IN) 30 6.6 3.3 3.7 1.2 0.2 0.0 0.0 0.0 0.1 0.7 2.5 5.7 24.0
MAXIMUM MONTHLY (IN) 55 33.7 18.4 14.9 14.3 5.0 T T T 3.1 6.1 12.1 19.0 33.7
YEAR OF OCCURRENCE 1957 1948 1948 1975 1979 1997 2001 1993 1965 1975 1964 1983 JAN 1957
MAXIMUM IN 24 HOURS (IN) 55 9.1 9.0 6.1 8.9 5.0 T T T 3.1 6.1 8.4 6.3 9.1
YEAR OF OCCURRENCE 1957 1989 1948 1975 1979 1997 2001 1993 1965 1975 1954 1998 JAN 1957
MAXIMUM SNOW DEPTH (IN) 53 16 12 8 7 1 0 0 0 2 5 8 11 16
YEAR OF OCCURRENCE 1957 1957 1960 1975 1979 1965 1975 1954 1983 JAN 1957
NORMAL NO. DAYS WITH:
SNOWFALL 1.0 30 2.5 1.0 1.2 0.3 0.1 0.0 0.0 0.0 0.* 0.2 0.8 2.1 8.2

2001 Grand Junction, Colorado (GJT)

PRECIPITATION (inches) 2001 GRAND JUNCTION, CO (GJT)
YEAR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANNUAL
1972 0.20 T 0.02 0.11 0.44 0.64 0.03 0.29 0.72 3.45 0.69 0.74 7.33
1973 0.79 0.12 0.65 0.86 1.45 0.87 0.52 0.62 0.33 0.20 0.91 0.62 7.94
1974 1.20 0.40 0.81 1.03 0.01 0.14 1.53 0.48 0.38 0.72 1.18 0.32 8.20
1975 0.53 0.49 1.74 1.38 1.23 0.43 1.39 0.09 0.16 0.85 0.39 0.50 9.18
1976 0.13 0.81 0.75 0.40 1.49 0.14 0.20 0.31 0.67 0.32 0.04 0.01 5.27
1977 0.37 0.06 0.50 0.54 0.59 0.04 0.89 0.59 0.52 0.50 0.70 0.38 5.68
1978 1.08 0.64 1.19 1.19 0.55 0.01 0.25 0.54 0.49 0.03 0.62 1.30 7.89
1979 1.36 0.63 2.02 0.42 1.45 0.78 0.08 0.61 0.01 0.25 1.02 0.27 8.90
1980 0.57 1.10 1.77 0.53 1.17 T 0.96 1.39 0.58 1.31 0.52 0.24 10.14
1981 0.44 0.16 1.35 0.56 1.49 0.17 0.41 0.82 0.25 2.06 0.47 0.60 8.78
1982 0.29 0.41 0.79 0.09 0.75 0.21 0.35 0.94 2.81 0.83 0.48 0.27 8.22
1983 0.50 0.64 1.59 0.90 1.68 1.54 1.92 0.73 1.11 0.36 2.00 1.85 14.82
1984 0.28 0.11 1.57 1.21 0.55 1.68 0.62 1.77 0.34 2.65 0.38 0.43 11.59
1985 0.51 0.26 0.92 1.78 1.09 0.39 1.21 0.24 1.67 2.32 1.10 0.73 12.22
1986 0.13 0.33 0.25 0.71 1.15 0.15 0.94 0.97 1.52 1.22 1.02 0.47 8.86
1987 0.30 1.21 1.95 0.46 1.51 0.23 1.51 0.83 0.13 0.65 1.92 0.83 11.53
1988 1.07 0.21 0.72 0.99 1.10 0.21 0.18 1.37 0.76 0.02 1.02 0.20 7.85
1989 0.98 1.33 0.51 0.23 0.39 0.24 0.27 1.01 0.33 0.14 T 0.08 5.51
1990 0.59 0.55 1.07 0.71 0.05 0.26 0.96 0.49 1.23 0.95 0.57 0.98 8.41
1991 0.92 0.13 0.70 0.87 0.20 0.30 0.40 0.57 2.30 1.20 1.10 0.54 9.23
1992 0.24 0.35 1.71 0.15 1.81 0.17 1.03 0.84 0.33 1.45 0.76 0.35 9.19
1993 1.36 1.09 1.72 1.30 1.99 0.03 0.04 1.42 0.41 1.34 0.41 0.57 11.68
1994 0.23 0.56 0.25 1.81 0.19 0.04 0.01 0.48 1.50 0.58 0.69 0.64 6.98
1995 0.62 0.52 1.74 0.96 2.04 1.32 0.87 0.47 0.66 0.24 0.20 0.55 10.19
1996 0.65 1.07 0.53 0.90 0.99 0.58 0.77 0.15 1.53 1.35 1.01 0.53 10.06
1997 0.63 0.34 0.53 2.15 1.53 0.29 0.28 2.67 2.84 1.20 0.62 0.14 13.22
1998 0.47 0.48 1.36 0.75 0.21 0.55 1.21 0.61 1.44 1.36 0.42 0.26 9.12
1999 0.09 0.28 0.03 2.06 0.68 0.60 0.51 2.22 1.01 0.17 0.18 0.26 8.09
2000 1.35 0.70 1.26 0.32 0.43 0.34 0.20 0.60 0.60 1.18 0.35 0.18 7.51
2001 0.43 0.67 0.98 0.58 0.57 T 1.20 1.46 0.15 0.99 1.06 0.31 8.40
POR=109 YRS 0.61 0.59 0.84 0.78 0.79 0.44 0.62 1.03 0.84 0.90 0.61 0.50 8.55

2001 Grand Junction, Colorado (GJT)

AVERAGE TEMPERATURE (F) 2001 GRAND JUNCTION, CO (GJT)
YEAR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANNUAL
1972 30.0 36.6 46.6 53.3 63.1 74.3 80.2 77.1 68.1 54.0 37.1 22.7 53.6
1973 11.5 29.1 42.1 48.1 61.5 70.5 78.1 77.4 65.7 56.4 41.2 30.1 51.0
1974 16.9 19.9 48.2 51.0 65.0 74.9 78.3 75.6 66.4 56.2 39.6 27.1 51.6
1975 20.0 33.0 41.0 46.4 57.1 67.5 78.3 75.4 67.1 53.5 36.2 27.4 50.2
1976 21.7 38.2 38.7 51.9 61.8 70.4 79.6 75.3 66.9 51.2 39.1 27.6 51.9
1977 23.9 37.1 40.8 56.9 63.7 79.1 80.2 78.3 70.2 58.2 40.3 33.3 55.2
1978 29.4 34.4 46.7 52.3 58.8 73.0 78.4 74.5 65.7 54.7 40.2 16.0 52.0
1979 16.6 23.5 41.1 52.5 60.3 71.0 78.7 74.6 72.0 58.9 33.2 26.9 50.8
1980 32.6 39.2 40.9 51.4 59.1 74.0 78.6 75.3 67.9 53.8 42.3 40.1 54.6
1981 36.8 37.9 44.0 56.8 60.9 76.4 79.4 76.8 69.2 50.7 41.6 31.3 55.2
1982 26.0 34.7 46.0 51.3 61.4 72.2 79.0 78.2 67.5 51.9 41.2 33.0 53.5
1983 34.3 40.9 45.9 48.7 58.7 69.8 78.3 80.4 71.4 58.2 42.1 30.5 54.9
1984 20.7 31.7 44.4 49.0 66.2 70.1 78.0 76.6 68.3 50.2 40.8 32.6 52.4
1985 31.1 32.0 43.9 54.5 63.6 73.0 77.6 77.1 62.4 52.8 38.8 31.9 53.2
1986 34.2 40.4 49.0 52.5 60.6 74.3 76.0 75.6 63.2 51.5 40.8 32.4 54.2
1987 27.4 36.8 40.1 54.5 61.2 73.5 75.2 72.9 66.2 56.8 39.6 27.9 52.7
1988 17.4 29.2 41.0 53.1 60.9 76.5 80.6 76.2 64.5 58.9 40.7 30.0 52.4
1989 20.2 27.7 47.5 57.0 63.8 71.0 80.5 74.4 68.3 54.9 40.6 29.2 52.9
1990 28.5 35.4 46.8 55.7 61.3 75.2 78.0 76.6 69.7 53.2 39.5 20.6 53.4
1991 17.6 32.0 42.0 48.8 62.0 72.5 77.6 76.2 66.5 55.0 37.7 26.2 51.2
1992 19.9 37.6 47.2 59.0 64.5 71.2 75.1 75.1 67.7 57.8 35.9 24.5 53.0
1993 31.9 36.2 45.6 50.0 61.9 70.1 76.7 73.2 65.9 51.7 35.6 29.2 52.3
1994 31.7 34.2 47.4 53.2 65.3 77.8 81.3 79.4 68.3 52.9 37.1 33.1 55.1
1995 33.7 43.4 46.2 50.6 56.9 67.8 76.1 79.0 68.5 53.3 43.6 35.3 54.5
1996 30.1 40.2 44.9 51.0 64.2 73.3 79.2 77.6 63.0 51.3 39.9 30.7 53.8
1997 30.6 34.2 45.0 46.5 62.2 72.7 76.2 74.0 66.4 51.7 38.2 28.2 52.2
1998 33.5 35.8 41.8 48.8 62.1 67.8 79.1 76.8 70.0 53.3 40.8 25.6 53.0
1999 32.9 37.4 48.5 47.8 58.7 70.6 77.6 73.6 63.5 54.2 43.0 30.3 53.2
2000 32.8 39.5 43.4 56.4 65.8 73.1 80.1 78.4 67.2 54.4 32.8 30.8 54.6
2001 28.0 36.2 45.3 53.8 64.3 74.1 78.9 75.7 69.7 55.0 43.7 28.3 54.4
POR=109 YRS 26.2 33.7 43.1 52.2 61.8 72.0 78.2 75.6 66.9 54.2 39.7 28.6 52.7

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 Grand Junction, Colorado (GJT)

HEATING DEGREE DAYS (base 65 F) 2001 GRAND JUNCTION, CO (GJT)
YEAR JUL AUG SEP OCT NOV DEC JAN FEB MAR APR MAY JUN TOTAL
1972-73 0 0 31 335 832 1303 1651 999 705 499 139 49 6543
1973-74 0 0 72 266 708 1075 1487 1260 513 415 66 32 5894
1974-75 0 0 60 266 756 1167 1387 888 736 551 249 51 6111
1975-76 0 0 35 358 858 1161 1335 775 807 386 122 25 5862
1976-77 0 0 41 421 769 1153 1267 775 743 250 94 0 5513
1977-78 0 1 17 214 736 975 1098 852 561 373 210 9 5046
1978-79 0 6 95 313 737 1510 1493 1154 732 377 192 37 6646
1979-80 0 3 0 209 945 1175 999 741 740 405 195 4 5416
1980-81 0 2 21 359 674 765 864 754 645 247 153 15 4499
1981-82 0 0 12 439 696 1039 1203 841 581 405 136 6 5358
1982-83 2 0 61 397 704 983 946 668 586 482 238 22 5089
1983-84 0 0 27 208 678 1064 1366 959 631 474 89 44 5540
1984-85 0 0 54 452 719 996 1044 919 646 310 81 12 5233
1985-86 0 0 139 371 779 1018 949 685 489 366 168 3 4967
1986-87 0 0 130 414 718 1001 1159 785 765 314 143 0 5429
1987-88 0 6 34 248 754 1147 1469 1031 741 350 172 8 5960
1988-89 0 0 106 183 724 1078 1379 1038 534 258 113 8 5421
1989-90 0 0 40 316 729 1103 1124 820 557 271 139 20 5119
1990-91 0 0 28 360 759 1371 1464 919 706 478 136 18 6239
1991-92 0 2 37 304 815 1193 1390 788 540 195 53 8 5325
1992-93 0 6 25 222 868 1245 1018 799 597 446 144 33 5403
1993-94 4 0 59 410 875 1102 1025 853 540 360 64 0 5292
1994-95 0 0 24 368 832 984 962 596 578 425 256 47 5072
1995-96 8 0 73 357 634 914 1073 712 614 415 88 2 4890
1996-97 0 0 135 421 748 1055 1056 857 613 547 122 4 5558
1997-98 0 0 42 412 799 1138 970 813 709 478 137 55 5553
1998-99 0 0 9 355 715 1217 987 767 501 508 219 33 5311
1999-00 0 0 88 331 651 1067 992 732 663 256 100 1 4881
2000-01 0 0 58 339 959 1053 1140 802 605 333 105 31 5425
2001- 0 0 23 316 633 1130

2001 Grand Junction, Colorado (GJT)

COOLING DEGREE DAYS (base 65 F) 2001 GRAND JUNCTION, CO (GJT)
YEAR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANNUAL
1972 0 0 0 0 86 288 479 381 130 3 0 0 1367
1973 0 0 0 0 35 222 410 393 101 6 0 0 1167
1974 0 0 0 1 73 335 420 335 109 0 0 0 1273
1975 0 0 0 0 9 133 419 328 106 9 0 0 1004
1976 0 0 0 0 32 195 460 324 103 0 0 0 1114
1977 0 0 0 16 60 429 477 420 180 10 0 0 1592
1978 0 0 0 0 25 258 420 308 123 1 0 0 1135
1979 0 0 0 6 52 225 428 310 215 27 0 0 1263
1980 0 0 0 1 16 280 427 325 115 19 0 0 1183
1981 0 0 0 9 31 367 456 375 143 0 0 0 1381
1982 0 0 0 0 33 229 443 415 144 0 0 0 1264
1983 0 0 0 0 49 171 421 483 226 3 0 0 1353
1984 0 0 0 0 134 200 408 368 159 0 0 0 1269
1985 0 0 0 4 45 261 396 382 67 0 0 0 1155
1986 0 0 0 0 39 289 348 334 82 0 0 0 1092
1987 0 0 0 5 30 262 324 256 76 2 0 0 955
1988 0 0 0 0 51 360 489 357 98 4 0 0 1359
1989 0 0 0 26 85 195 489 300 145 11 0 0 1251
1990 0 0 0 1 34 331 412 368 174 3 0 0 1323
1991 0 0 0 0 50 247 398 356 88 0 0 0 1139
1992 0 0 0 21 43 203 319 328 114 7 0 0 1035
1993 0 0 0 0 56 193 371 260 92 6 0 0 978
1994 0 0 0 13 82 388 514 454 126 0 0 0 1577
1995 0 0 0 0 9 138 362 444 185 3 0 0 1141
1996 0 0 0 1 67 256 448 396 82 4 0 0 1254
1997 0 0 0 0 44 240 353 285 93 8 0 0 1023
1998 0 0 0 0 51 148 445 375 163 0 0 0 1182
1999 0 0 0 0 27 204 401 274 45 4 0 0 955
2000 0 0 0 5 131 249 476 421 129 15 0 0 1426
2001 0 0 0 3 89 311 437 341 170 13 0 0 1364

2001 Grand Junction, Colorado (GJT)

SNOWFALL (inches) 2001 GRAND JUNCTION, CO (GJT)
YEAR JUL AUG SEP OCT NOV DEC JAN FEB MAR APR MAY JUN TOTAL
1972-73 0.0 0.0 0.0 5.7 1.3 9.7 12.8 1.2 1.3 2.0 T 0.0 34.0
1973-74 0.0 0.0 0.0 0.0 7.7 5.7 17.0 5.5 T 1.2 0.0 0.0 37.1
1974-75 0.0 0.0 0.0 T 0.1 4.6 7.9 4.4 8.8 14.3 1.3 0.0 41.4
1975-76 0.0 0.0 0.0 6.1 3.9 7.2 1.7 4.0 6.8 0.2 0.0 0.0 29.9
1976-77 0.0 0.0 0.0 0.0 T 0.1 4.2 T 2.3 1.7 0.0 0.0 8.3
1977-78 0.0 0.0 0.0 T 3.3 2.5 12.0 2.5 0.6 T T 0.0 20.9
1978-79 0.0 0.0 0.0 0.0 2.9 11.8 18.7 9.6 3.4 1.1 5.0 0.0 52.5
1979-80 0.0 0.0 0.0 0.0 8.2 3.5 2.2 0.5 7.3 0.2 0.0 0.0 21.9
1980-81 0.0 0.0 0.0 0.0 T 0.0 3.9 0.8 1.2 T 0.0 0.0 5.9
1981-82 0.0 0.0 0.0 0.5 3.3 3.4 3.4 4.0 0.8 T 0.0 0.0 15.4
1982-83 0.0 0.0 0.0 T T 1.9 6.1 3.1 1.5 2.2 T 0.0 14.8
1983-84 0.0 0.0 0.0 0.0 4.2 19.0 3.7 0.6 6.1 2.9 0.0 0.0 36.5
1984-85 0.0 0.0 0.0 0.7 2.0 2.7 5.0 2.7 5.6 0.1 0.0 0.0 18.8
1985-86 0.0 0.0 0.0 0.0 4.6 4.4 1.8 0.7 T 0.2 T 0.0 11.7
1986-87 0.0 0.0 0.0 2.2 1.2 1.0 3.0 5.5 9.4 0.6 T 0.0 22.9
1987-88 0.0 0.0 0.0 0.0 1.1 7.1 12.2 2.2 4.3 0.0 0.0 0.0 26.9
1988-89 0.0 0.0 0.0 0.0 0.9 3.1 10.2 16.0 1.1 T T 0.0 31.3
1989-90 0.0 0.0 0.0 0.0 0.0 1.1 6.2 8.6 1.8 0.8 0.0 0.0 18.5
1990-91 0.0 0.0 0.0 0.0 1.5 5.1 12.7 0.3 3.7 4.7 0.0 0.0 28.0
1991-92 0.0 0.0 T 2.5 1.9 7.6 2.7 1.9 T 0.0 T 0.0 16.6
1992-93 0.0 0.0 0.0 0.0 2.0 4.4 6.0 8.4 0.0 0.4 T 0.0 21.2
1993-94 0.0 T 0.0 0.0 0.6 5.9 1.1 4.6 0.3 T 0.0 0.0 12.5
1994-95 0.0 0.0 0.0 T 5.4 2.2 4.0 1.1 3.7 T T 0.0 16.4
1995-96 0.0 0.0 T 1.2 T 3.7 2.1 0.5 3.0 T 0.0 0.0 10.5
1996-97 0.0 0.0 0.0 1.1 4.2 3.5 4.9 3.2 1.2 6.5 T T 24.6
1997-98 0.0 T 0.0 0.5 T 1.7 3.8 0.5 3.8 0.1 0.0 T 10.4
1998-99 0.0 0.0 T 0.0 2.5 7.0 0.5 1.4 0.0 3.8 T 0.0 15.2
1999-00 0.0 T 0.0 0.0 T 3.3 3.1 0.6 6.2 0.0 0.0 0.0 13.2
2000-01 0.0 0.0 0.0 0.0 3.6 1.5 4.3 3.3 3.7 0.0 0.0 0.0 16.4
2001- T 0.0 T 0.0 2.8 3.3
POR=54 YRS 0.0 T 0.1 0.5 2.5 5.0 6.6 3.8 3.6 1.2 0.2 0.0 23.5



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