2001 BOISE, IDAHO (BOI)



Boise is situated in the Boise River Valley about 8 miles below the mouth of a mountain canyon where the valley proper begins. Sheltered by large shade trees and averaging 2,710 feet in elevation, the denser part of the city covers a gentle alluvial slope about 2 miles wide, stretching southwest from the foothills of the Boise Mountains to the river. The Boise Mountains immediately north of the city rise 5,000 to 6,000 feet above sea level in about 8 miles, the slopes partly mantled with sagebrush and then chaparral giving way near the summit to ridges of fir, spruce, and pine. Across the river, the land rises in two irregular steps, or benches, for several miles, finally reaching the low divide between the Boise and Snake Rivers. Downstream the valley widens, merging with the valley of the Snake about 40 miles to the northwest. Once semi–arid, the entire area is now irrigated from the upstream reservoirs.

Although air masses from the Pacific are considerably modified by the time they reach Boise, their influence, particularly in winter, alternates with that of atmospheric developments from other directions. The result is almost a typical upland continental type of climate in summer, while winters are usually tempered by periods of cloudy or stormy and mild weather. Autumns have prolonged periods of near ideal weather, while springtime is noted by changeable weather and varied temperatures. The Boise climate in general may be described as dry and temperate, with sufficient variation to be stimulating.

Summer hot periods rarely last longer than a few days. Temperatures of 100 degrees or higher occur nearly every year.

Winter cold spells with temperatures of 10 degrees or lower generally last longer than the summer hot spells. During cold weather, however, there is ordinarily little wind to add to the discomfort.

The normal precipitation pattern in the Boise area shows a winter high and a very pronounced summer low. Total amounts and intensity are generally greatest near the foothills, dwindling to westward and southward.

Tornadoes are very rare as are destructive force winds. Northwesterly winds, drying and rather raw in character, although of moderate velocity, are common from March through May. Diurnal southeasterly winds, descending from nearby foothills at night, frequently have a moderating effect on winter temperatures. There is an occasional, but moderate, duststorm during the warmer months, usually occurring at times of cold frontal passage.

Relative humidity is low but widespread irrigation maintains humidity several percent above the general dryness of western arid conditions in summer. Thunderstorms occur primarily during spring and summer, with less frequency during fall and occasionally during winter. December and January are the months of heavy fog or low stratus cloud conditions. Only a moderate amount of sunshine is received in the average winter, but protracted periods of clear, sunny weather are the rule in summer. Ice storms are practically unknown.

Based on the 1951–1980 period, the average first occurrence of 32 degrees Fahrenheit in the fall is October 9 and the average last occurrence in the spring is May 8.

NORMALS, MEANS, AND EXTREMES

BOISE, ID (BOI)

LATITUDE:    LONGITUDE:     ELEVATION (FT):    TIME ZONE:    WBAN: 24131

43 33′ 54″ N  116 13′ 12″ W  GRND:  2858  BARO: &#x 0A0;2861  MOUNTAIN  (UTC + 7)

2001 Boise, Idaho (BOI)

ELEMENT POR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC YEAR
TEMPERATURE F NORMAL DAILY MAXIMUM 30 36.4 44.2 52.9 61.4 71.0 80.9 90.2 88.1 77.0 64.6 48.7 37.7 62.8
MEAN DAILY MAXIMUM 54 37.0 44.4 52.7 61.7 71.1 80.2 90.1 88.3 77.9 64.8 48.7 38.3 62.9
HIGHEST DAILY MAXIMUM 62 63 71 81 92 98 109 111 110 102 94 78 65 111
YEAR OF OCCURRENCE 1953 1992 1978 1987 1986 1940 1960 1961 1945 1997 1999 1964 JUL 1960
MEAN OF EXTREME MAXS. 54 51.3 58.5 68.4 78.8 89.4 97.5 102.4 100.7 93.8 82.4 65.1 53.2 78.5
NORMAL DAILY MINIMUM 30 21.6 27.5 31.9 36.7 43.9 52.1 57.7 56.8 48.2 39.0 31.1 22.5 39.1
MEAN DAILY MINIMUM 54 22.1 27.3 31.8 37.0 44.3 51.7 58.0 57.3 48.9 39.0 30.5 23.3 39.3
LOWEST DAILY MINIMUM 62 -17 -15 6 19 22 31 35 34 23 11 -3 -25 -25
YEAR OF OCCURRENCE 1950 1989 1971 1968 1982 1995 1986 1992 1970 1971 1985 1990 DEC 1990
MEAN OF EXTREME MINS. 54 3.3 11.5 19.6 24.4 30.3 38.8 45.9 44.9 34.7 24.7 16.5 6.8 25.1
NORMAL DRY BULB 30 29.0 35.9 42.4 49.1 57.5 66.5 74.0 72.5 62.6 51.8 39.9 30.1 50.9
MEAN DRY BULB 54 29.6 35.8 42.2 49.3 57.8 66.0 74.1 72.8 63.4 51.8 39.6 30.7 51.1
MEAN WET BULB 18 27.2 31.7 37.6 42.7 48.4 53.6 57.5 56.4 50.7 42.5 34.7 26.4 42.5
MEAN DEW POINT 18 23.4 26.3 29.5 32.9 37.9 41.7 43.8 42.3 38.1 31.8 28.9 22.3 33.2
NORMAL NO. DAYS WITH:
MAXIMUM 90 30 0.0 0.0 0.0 0.1 1.3 6.4 18.7 16.0 3.2 0.1 0.0 0.0 45.8
MAXIMUM 32 30 10.2 3.1 0.2 0.0 0.0 0.0 0.0 0.0 0.0 0.0 1.0 8.0 22.5
MINIMUM 32 30 25.7 19.5 17.0 8.9 2.1 * 0.0 0.0 0.6 5.8 16.5 25.3 121.4
MINIMUM 0 30 1.7 0.5 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.1 1.8 4.1
H/C NORMAL HEATING DEG. DAYS 30 1116 815 701 477 242 75 6 20 160 414 753 1082 5861
NORMAL COOLING DEG. DAYS 30 0 0 0 0 9 120 285 252 88 0 0 0 754
RH NORMAL (PERCENT) 30 75 70 60 52 49 45 36 37 45 54 68 75 56
HOUR 05 LST 30 79 78 72 68 67 65 54 53 60 66 76 79 68
HOUR 11 LST 30 73 66 54 46 43 39 32 33 39 47 64 72 51
HOUR 17 LST 30 68 57 43 35 31 28 21 23 29 37 57 68 41
HOUR 23 LST 30 78 75 66 59 56 50 40 41 50 60 74 78 61
S PERCENT POSSIBLE SUNSHINE 59 40 50 62 68 72 76 87 85 82 69 43 38 64
W/O MEAN NO. DAYS WITH:
HEAVY FOG (VISBY 1/4 MI) 63 5.8 3.1 0.8 0.3 0.2 0.1 0.0 0.0 0.1 0.5 2.9 5.5 19.3
THUNDERSTORMS 63 0.0 0.3 0.6 0.9 2.8 2.8 2.6 2.4 1.6 0.6 0.3 0.1 15.0
CLOUDINESS MEAN:
SUNRISE-SUNSET (OKTAS)
MIDNIGHT-MIDNIGHT (OKTAS)
MEAN NO. DAYS WITH:
CLEAR
PARTLY CLOUDY
CLOUDY
PR MEAN STATION PRESSURE (IN) 29 27.19 27.09 27.00 27.00 27.00 27.00 27.00 27.00 27.00 27.10 27.10 27.19 27.06
MEAN SEA-LEVEL PRES. (IN) 18 30.22 30.12 30.02 29.97 29.91 29.99 29.90 29.91 29.97 30.07 30.14 30.24 30.04
WINDS MEAN SPEED (MPH) 47 7.7 8.7 9.8 9.7 9.2 8.9 8.3 8.0 7.9 8.0 8.1 7.8 8.5
PREVAIL. DIR (TENS OF DEGS) 31 13 13 13 31 31 31 31 13 13 13 13 13 13
MAXIMUM 2-MINUTE:
SPEED (MPH) 6 33 36 32 46 32 40 36 39 33 35 39 45 46
DIR. (TENS OF DEGS) 31 30 32 31 27 31 34 30 19 28 11 31 31
YEAR OF OCCURRENCE 1996 1999 2000 1998 1997 1997 1997 1999 1997 2001 2001 2000 APR 1998
MAXIMUM 5-SECOND:
SPEED (MPH) 6 38 43 40 52 41 51 47 48 41 44 45 63 63
DIR. (TENS OF DEGS) 31 26 32 32 27 30 17 14 18 28 11 30 30
YEAR OF OCCURRENCE 1996 2000 1997 1998 1997 1997 1998 2000 1997 2001 2001 2000 DEC 2000
PRECIPITATION NORMAL (IN) 30 1.45 1.07 1.29 1.24 1.08 0.81 0.35 0.43 0.80 0.75 1.48 1.36 12.11
MAXIMUM MONTHLY (IN) 62 3.87 3.70 3.46 3.04 4.40 3.41 1.62 2.37 2.93 2.59 3.36 4.23 4.40
YEAR OF OCCURRENCE 1970 1986 1989 1955 1998 1941 1982 1968 1986 2000 1988 1983 MAY 1998
MINIMUM MONTHLY (IN) 62 0.12 0.18 0.17 0.09 T 0.01 0.00 0.00 0.00 0.00 0.14 0.09 0.00
YEAR OF OCCURRENCE 1949 1997 1994 1949 1992 1966 1947 1998 1987 1988 1976 1976 AUG 1998
MAXIMUM IN 24 HOURS (IN) 62 1.48 1.00 1.65 1.27 2.05 2.24 0.94 1.61 1.74 1.06 0.88 1.16 2.24
YEAR OF OCCURRENCE 1953 1951 1981 1969 1990 1958 1960 1979 1976 2000 1971 1955 JUN 1958
NORMAL NO. DAYS WITH:
PRECIPITATION 0.01 30 11.8 9.7 9.7 8.2 7.2 5.6 2.8 3.3 4.2 5.6 10.4 11.4 89.9
PRECIPITATION 1.00 30 0.0 0.0 * 0.1 0.1 0.1 0.0 * * 0.0 0.0 0.0 0.3
SNOWFALL NORMAL (IN) 30 6.3 2.7 1.4 1.0 0.2 0.0 0.0 0.0 0.0 0.1 2.7 6.9 21.3
MAXIMUM MONTHLY (IN) 62 21.4 25.2 11.9 8.0 4.0 T T T T 2.7 18.6 26.2 26.2
YEAR OF OCCURRENCE 1964 1949 1951 1967 1964 1995 1995 1989 1998 1971 1985 1983 DEC 1983
MAXIMUM IN 24 HOURS (IN) 62 8.5 13.0 6.4 7.2 4.0 T T T T 1.7 6.5 9.8 13.0
YEAR OF OCCURRENCE 1950 1949 1952 1969 1964 1995 1995 1989 1998 1971 1964 1996 FEB 1949
MAXIMUM SNOW DEPTH (IN) 53 12 9 6 1 0 0 0 0 0 0 11 13 13
YEAR OF OCCURRENCE 1982 1949 1952 1975 1985 1985 DEC 1985
NORMAL NO. DAYS WITH:
SNOWFALL 1.0 30 2.1 0.9 0.4 0.3 0.* 0.0 0.0 0.0 0.0 0.1 1.0 2.7 7.5

2001 Boise, Idaho (BOI)

PRECIPITATION (inches) 2001 BOISE, ID (BOI)
YEAR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANNUAL
1972 2.15 0.91 1.50 0.62 0.32 0.90 0.21 0.05 1.11 0.64 1.11 1.79 11.31
1973 1.14 0.42 0.65 1.49 0.74 0.19 0.07 0.03 0.82 1.15 2.44 2.23 11.37
1974 1.35 0.66 1.50 0.67 0.10 0.60 0.53 0.22 T 1.45 0.67 1.71 9.46
1975 0.59 2.62 1.92 1.53 0.88 0.78 0.82 0.48 0.01 1.99 0.78 1.29 13.69
1976 1.49 1.31 0.72 1.60 0.46 1.66 1.15 0.95 2.11 0.52 0.14 0.09 12.20
1977 0.65 0.57 0.86 0.19 1.80 1.26 0.41 0.73 1.20 0.21 1.86 2.46 12.20
1978 2.37 1.50 1.43 2.34 0.36 0.56 0.48 0.24 0.89 T 1.06 0.60 11.83
1979 1.93 1.20 0.48 1.60 1.28 0.18 0.01 1.81 0.04 1.50 1.30 0.74 12.07
1980 1.56 1.29 2.14 1.20 3.77 0.58 0.03 T 1.59 0.30 1.26 1.49 15.21
1981 1.20 1.02 2.76 1.93 0.95 0.77 0.23 0.13 0.36 0.97 2.24 2.72 15.28
1982 1.42 1.54 1.39 0.79 0.39 0.35 1.62 0.19 1.38 1.74 1.10 1.92 13.83
1983 1.67 1.26 2.70 2.29 1.93 0.17 1.16 0.28 0.65 0.56 1.87 4.23 18.77
1984 0.80 0.86 1.43 1.62 1.06 1.47 0.23 1.24 0.69 0.85 2.36 0.63 13.24
1985 0.20 0.55 0.97 0.90 1.52 0.37 0.85 0.04 1.81 0.84 1.85 1.24 11.14
1986 0.98 3.70 2.01 1.55 1.10 0.35 0.17 0.07 2.93 0.33 1.00 0.12 14.31
1987 0.73 1.24 2.01 0.38 0.69 0.58 0.70 0.11 0.00 T 1.00 1.05 8.49
1988 1.30 0.43 1.45 1.80 1.33 0.47 0.02 0.09 0.24 0.00 3.36 0.81 11.30
1989 1.14 1.15 3.46 0.46 0.21 0.08 0.03 0.78 1.20 1.24 0.59 0.10 10.44
1990 0.84 0.79 0.77 2.14 4.07 0.11 0.42 0.39 0.50 0.45 0.61 0.98 12.07
1991 0.96 0.46 0.55 1.65 1.57 0.64 0.37 0.04 0.21 0.91 1.76 0.35 9.47
1992 0.36 0.92 0.17 0.66 T 2.07 0.03 T 0.30 0.90 1.37 0.89 7.67
1993 1.65 0.96 2.45 2.09 0.92 2.10 0.52 0.24 T 0.47 0.38 0.98 12.76
1994 1.28 0.90 0.17 1.25 1.01 0.24 0.10 T 0.10 0.78 1.78 1.79 9.40
1995 2.10 0.51 1.51 1.03 2.36 0.88 0.59 0.06 0.22 0.42 2.20 2.14 14.02
1996 1.33 1.07 1.97 1.47 1.67 0.21 0.12 T 0.46 0.68 1.71 3.43 14.12
1997 2.74 0.18 0.52 1.89 1.14 1.35 0.45 0.27 0.67 0.55 0.68 0.65 11.09
1998 2.73 1.39 0.99 0.81 4.40 1.21 0.49 0.00 1.96 0.11 0.97 1.65 16.71
1999 1.40 1.96 0.75 0.61 1.10 0.47 T 0.29 0.00 0.11 1.00 0.90 8.59
2000 1.51 2.06 1.69 1.01 0.83 0.14 0.03 0.10 0.60 2.59 0.68 0.80 12.04
2001 1.07 0.49 1.07 1.20 0.27 0.32 0.15 T 0.44 0.86 1.52 1.15 8.54
POR=102 YRS 1.47 1.25 1.30 1.21 1.25 0.87 0.20 0.20 0.50 0.90 1.29 1.30 11.74

2001 Boise, Idaho (BOI)

AVERAGE TEMPERATURE (F) 2001 BOISE, ID (BOI)
YEAR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANNUAL
1972 30.9 36.5 45.5 46.7 60.6 67.6 73.5 74.5 58.8 51.7 40.5 23.8 50.9
1973 30.7 39.4 43.0 49.1 60.5 67.6 75.6 73.0 63.1 52.4 41.7 38.4 52.9
1974 29.4 38.7 42.6 49.7 55.4 71.7 73.8 71.7 65.3 52.2 41.7 33.2 52.1
1975 28.2 36.9 41.5 44.5 56.2 64.4 78.3 70.0 65.5 52.3 39.5 31.4 50.7
1976 32.2 34.2 37.1 47.3 59.3 62.6 73.1 67.7 64.1 50.8 40.9 29.3 49.9
1977 19.0 33.8 39.8 54.1 53.7 70.2 72.7 73.6 62.0 53.2 39.6 37.3 50.8
1978 37.0 38.2 48.7 48.5 54.3 64.5 72.8 69.9 61.4 52.8 36.7 27.0 51.0
1979 16.2 34.3 43.2 48.7 57.8 66.7 74.1 71.2 67.3 54.4 34.7 35.8 50.4
1980 30.3 39.8 41.1 52.6 57.2 62.6 72.9 67.2 62.6 51.6 39.8 33.1 50.9
1981 33.9 36.8 44.5 50.3 54.7 63.2 71.0 74.2 63.7 48.7 44.0 35.3 51.7
1982 24.8 30.0 41.3 45.2 54.9 65.8 70.1 72.7 60.4 50.9 36.0 31.5 48.6
1983 35.9 41.5 44.6 47.1 56.5 63.8 69.4 74.9 60.8 53.8 42.0 23.2 51.1
1984 21.2 30.2 41.9 45.9 54.8 61.7 74.2 75.5 60.1 46.9 39.1 22.9 47.9
1985 19.1 25.8 36.0 51.6 58.5 67.2 77.7 69.2 56.2 48.4 27.7 12.6 45.8
1986 29.4 41.0 48.0 48.3 59.1 72.0 69.6 75.9 57.4 52.6 40.4 28.0 51.8
1987 27.8 37.6 44.2 56.0 62.2 70.2 71.2 70.0 65.6 54.9 40.7 32.9 52.8
1988 26.1 37.8 42.6 52.7 57.9 70.7 74.6 71.6 61.7 59.9 40.7 27.0 51.9
1989 24.7 23.2 43.7 53.1 56.3 68.5 77.0 70.0 63.3 51.2 39.4 30.4 50.1
1990 34.2 34.1 44.3 54.7 55.7 66.9 76.2 74.0 69.9 51.0 41.2 18.1 51.7
1991 24.4 41.6 43.0 48.3 54.9 62.6 75.7 76.6 65.8 51.8 37.4 31.7 51.2
1992 33.1 42.1 48.9 54.9 64.3 69.8 71.4 73.9 63.4 54.4 34.5 28.5 53.3
1993 24.8 28.9 41.7 48.1 63.1 61.9 65.0 68.6 63.0 53.2 32.8 33.3 48.7
1994 32.7 34.7 46.1 52.6 61.0 67.9 77.0 76.1 66.8 50.3 32.6 30.4 52.4
1995 36.2 41.5 43.6 48.2 56.9 63.9 73.4 71.2 65.7 49.2 44.4 33.1 52.3
1996 32.5 35.1 44.2 50.0 55.4 66.7 76.7 74.8 61.8 52.4 41.3 36.3 52.3
1997 32.1 36.8 45.4 48.9 62.9 66.0 72.8 75.6 67.7 52.0 43.0 31.2 52.9
1998 38.9 40.2 44.3 49.9 56.3 63.4 79.2 76.7 69.8 51.7 43.7 30.7 53.7
1999 35.3 37.0 43.8 47.5 55.8 66.3 73.7 75.1 64.0 54.3 46.9 31.9 52.6
2000 34.2 41.7 43.4 54.3 59.7 68.6 76.1 75.9 63.0 52.3 32.7 31.1 52.8
2001 27.2 33.9 45.9 48.1 61.4 67.3 74.3 78.7 68.4 53.5 44.0 30.7 52.8
POR=102 YRS 29.7 35.6 42.4 49.8 57.8 65.5 74.3 72.4 63.0 52.3 40.1 31.5 51.2

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 Boise, Idaho (BOI)

HEATING DEGREE DAYS (base 65 F) 2001 BOISE, ID (BOI)
YEAR JUL AUG SEP OCT NOV DEC JAN FEB MAR APR MAY JUN TOTAL
1972-73 11 0 222 406 727 1270 1056 708 673 470 182 91 5816
1973-74 4 13 103 382 692 817 1099 728 687 452 304 42 5323
1974-75 10 11 53 391 689 983 1132 782 721 607 275 76 5730
1975-76 6 21 74 399 759 1035 1013 886 858 524 189 132 5896
1976-77 3 36 76 434 720 1097 1418 868 772 342 358 7 6131
1977-78 8 32 145 362 758 853 859 744 500 488 329 74 5152
1978-79 5 38 173 370 841 1171 1503 855 668 481 241 72 6418
1979-80 5 2 26 326 903 899 1070 725 736 367 257 133 5449
1980-81 0 41 104 409 750 983 957 783 631 432 315 97 5502
1981-82 15 5 137 497 624 915 1240 974 729 586 312 86 6120
1982-83 27 2 182 432 863 1030 897 653 622 530 309 82 5629
1983-84 38 0 145 338 682 1290 1353 1004 710 566 328 162 6616
1984-85 0 8 204 557 771 1299 1412 1093 895 398 226 53 6916
1985-86 0 26 259 509 1113 1619 1097 668 522 499 280 15 6607
1986-87 35 2 259 376 733 1141 1149 761 639 287 140 41 5563
1987-88 23 18 86 306 722 990 1198 780 686 359 261 59 5488
1988-89 4 5 157 178 724 1169 1242 1166 656 356 276 30 5963
1989-90 0 29 97 421 759 1064 951 858 633 303 286 82 5483
1990-91 6 10 26 430 710 1449 1252 651 676 493 306 100 6109
1991-92 0 0 55 409 822 1026 982 657 492 308 92 54 4897
1992-93 6 40 118 340 907 1124 1239 1004 715 501 140 155 6289
1993-94 53 45 124 367 960 975 993 839 579 378 148 64 5525
1994-95 9 1 34 449 967 1066 887 652 657 499 255 111 5587
1995-96 5 23 86 485 610 984 1000 859 636 447 292 55 5482
1996-97 1 6 162 405 703 883 1013 783 601 473 128 41 5199
1997-98 18 0 61 410 651 1040 803 684 635 452 270 85 5109
1998-99 0 0 51 408 635 1058 914 778 652 520 311 95 5422
1999-00 8 13 101 324 535 1017 949 673 663 315 179 41 4818
2000-01 4 0 128 389 960 1044 1165 867 585 504 191 69 5906
2001- 6 0 23 355 626 1056

2001 Boise, Idaho (BOI)

COOLING DEGREE DAYS (base 65 F) 2001 BOISE, ID (BOI)
YEAR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANNUAL
1972 0 0 0 0 62 129 283 303 40 0 0 0 817
1973 0 0 0 0 51 177 341 269 51 1 0 0 890
1974 0 0 0 0 13 252 289 226 71 0 0 0 851
1975 0 0 0 0 10 64 426 182 96 11 0 0 789
1976 0 0 0 0 19 66 263 130 55 2 0 0 535
1977 0 0 0 20 10 170 255 306 61 0 0 0 822
1978 0 0 1 0 6 64 254 200 72 0 0 0 597
1979 0 0 0 0 27 129 293 199 101 3 0 0 752
1980 0 0 0 3 25 68 251 117 38 2 0 0 504
1981 0 0 0 1 3 52 205 296 101 0 0 0 658
1982 0 0 0 0 2 117 194 248 50 0 0 0 611
1983 0 0 0 0 55 50 180 313 26 0 0 0 624
1984 0 0 0 0 19 70 291 340 64 2 0 0 786
1985 0 0 0 2 28 125 402 165 4 0 0 0 726
1986 0 0 0 1 103 235 184 348 37 0 0 0 908
1987 0 0 0 23 61 202 223 180 111 0 0 0 800
1988 0 0 0 0 46 237 308 215 66 24 0 0 896
1989 0 0 0 6 14 140 376 191 56 0 0 0 783
1990 0 0 0 3 5 145 357 293 180 6 0 0 989
1991 0 0 0 0 0 36 337 368 85 6 0 0 832
1992 0 0 0 11 76 202 208 321 77 20 0 0 915
1993 0 0 0 0 86 68 61 162 71 8 0 0 456
1994 0 0 0 15 30 156 386 354 96 0 0 0 1037
1995 0 0 0 0 12 83 272 225 114 0 0 0 706
1996 0 0 0 0 4 111 372 314 73 22 0 0 896
1997 0 0 0 0 71 80 266 337 151 13 0 0 918
1998 0 0 0 4 9 42 449 371 201 3 0 0 1079
1999 0 0 0 0 32 142 282 334 80 1 0 0 871
2000 0 0 0 3 22 155 354 347 74 2 0 0 957
2001 0 0 0 4 85 146 303 433 131 7 0 0 1109

2001 Boise, Idaho (BOI)

SNOWFALL (inches) 2001 BOISE, ID (BOI)
YEAR JUL AUG SEP OCT NOV DEC JAN FEB MAR APR MAY JUN TOTAL
1972-73 0.0 0.0 0.0 T T 12.6 7.3 0.3 0.6 T 0.0 0.0 20.8
1973-74 0.0 0.0 0.0 0.0 8.8 4.5 6.0 2.4 5.7 T 0.0 0.0 27.4
1974-75 0.0 0.0 0.0 0.0 0.9 4.6 5.4 6.3 2.2 2.6 0.9 0.0 22.9
1975-76 0.0 0.0 0.0 T 3.9 4.2 6.3 6.7 3.9 0.2 0.0 0.0 25.2
1976-77 0.0 0.0 0.0 0.0 T 1.1 7.2 3.5 2.9 T T 0.0 14.7
1977-78 0.0 0.0 0.0 T 4.7 4.4 1.6 7.3 T T T 0.0 18.0
1978-79 0.0 0.0 0.0 0.0 0.2 3.1 11.9 4.3 0.8 0.2 T 0.0 20.5
1979-80 0.0 0.0 0.0 0.0 6.6 1.4 3.8 0.8 2.7 T 0.0 0.0 15.3
1980-81 0.0 0.0 0.0 0.0 3.2 1.7 3.6 0.7 T 0.5 0.0 0.0 9.7
1981-82 0.0 0.0 0.0 0.0 2.8 11.1 12.2 1.4 3.6 1.4 0.0 0.0 32.5
1982-83 0.0 0.0 0.0 0.0 2.1 6.4 1.6 0.9 T T 0.8 0.0 11.8
1983-84 0.0 0.0 0.0 0.0 2.2 26.2 4.3 4.4 T 0.3 T 0.0 37.4
1984-85 0.0 0.0 0.0 T 0.2 7.7 2.6 5.3 1.5 1.0 0.0 0.0 18.3
1985-86 0.0 0.0 0.0 T 18.6 12.6 3.9 4.4 0.0 T 0.0 0.0 39.5
1986-87 0.0 0.0 0.0 0.0 5.9 0.9 0.5 0.6 T 0.0 0.0 0.0 7.9
1987-88 0.0 0.0 0.0 0.0 0.5 3.0 3.9 0.3 2.9 1.2 0.0 0.0 11.8
1988-89 0.0 0.0 0.0 0.0 2.5 10.8 8.0 0.7 T T 0.0 0.0 22.0
1989-90 0.0 T 0.0 T 0.4 T 5.2 6.5 0.4 T T 0.0 12.5
1990-91 0.0 0.0 0.0 0.0 0.1 15.7 1.5 T 1.2 T 0.0 0.0 18.5
1991-92 0.0 0.0 0.0 1.1 2.8 T 0.3 T 0.0 T 0.0 0.0 4.2
1992-93 0.0 0.0 0.0 T 3.6 5.7 14.6 10.4 0.2 T T 0.0 34.5
1993-94 0.0 0.0 0.0 0.0 1.9 0.2 2.8 3.8 T T 0.0 0.0 8.7
1994-95 0.0 0.0 0.0 0.0 8.8 8.5 1.5 5.7 1.2 T T T 25.7
1995-96 T 0.0 0.0 0.0 0.2 5.9 6.7 6.9 1.8 T T 0.0 21.5
1996-97 0.0 0.0 0.0 T T 13.0 3.4 T 0.3 T 0.0 0.0 16.7
1997-98 0.0 0.0 0.0 0.0 0.0 0.6 4.2 1.4 1.1 T 0.0 0.0 7.3
1998-99 T 0.0 T 0.0 T 8.8 1.7 5.7 6.7 0.4 0.0 0.0 23.3
1999-00 0.0 0.0 0.0 0.0 0.9 2.7 6.2 2.1 2.3 0.0 T 0.0 14.2
2000-01 0.0 0.0 0.0 0.0 4.0 1.6 8.9 3.1 1.3 T 0.0 0.0 18.9
2001- 0.0 0.0 0.0 0.0 3.5 9.9
POR=61 YRS T T 0.0 0.1 2.3 5.7 6.3 3.5 1.8 0.6 0.1 T 20.4



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