BOISE, IDAHO
NORMALS, MEANS, AND EXTREMES

LATITUDE: 43 34' N LONGITUDE: 116 13' W ELEVATION: FT. GRND 2838 BARO 2875 TIME ZONE: MOUNTAIN WBAN: 24131

(a)
JAN
FEB
MAR
APR
MAY
JUN
JUL
AUG
SEP
OCT
NOV
DEC
YEAR
TEMPERATURE (Deg. F)
Normals
-Daily Maximum
-Daily Minimum
-Monthly
Extremes
-Record Highest
-Year
-Record Lowest
-Year






56

56



36.4
21.6
29.0

63
1953
-17
1950


44.2
27.5
35.9

71
1992
-15
1989


52.9
31.9
42.4

81
1978
6
1971


61.4
36.7
49.1

92
1987
19
1968


71.0
43.9
57.5

98
1986
22
1982


80.9
52.1
66.5

109
1940
31
1995


90.2
57.7
74.0

111
1960
35
1986


88.1
56.8
72.5

110
1961
34
1992


77.0
48.2
62.6

102
1945
23
1970


64.6
39.0
51.8

94
1992
11
1971


48.7
31.1
39.9

74
1988
-3
1985


37.7
22.5
30.1

65
1964
-25
1990


62.8
39.1
50.9

111
JUL 1960
-25
DEC 1990
NORMAL DEGREE DAYS
Heating (base 65 Deg. F)
Cooling (base 65 Deg. F)




1116
0

815
0

701
0

477
0

242
9

75
120

6
285

20
252

160
88

414
0

753
0

1092
0

5861
754
% OF POSSIBLE SUNSHINE
53
40
51
62
68
71
76
87
85
82
69
43
38
64
MEAN SKY COVER(tenths)
Sunrise - Sunset
MEAN NUMBER OF DAYS:
Sunrise to Sunset
-Clear
-Partly Cloudy
-Cloudy
Precipitation
.01 inches or more
Snow, Ice Pellets, Hail
1.0 inches or more
Thunderstorms
Heavy Fog Visibility
1/4 mile or less
Temperature Deg. F
-Maximum
90 Deg. F and above
32 Deg. F and below
-Minimum
32 Deg. F and below
0 Deg. F and below

56


56
56
56

56

56
56

56


56
56

56
56

7.8


4.4
4.9
21.6

11.8

2.3
0.*

6.0


0.0
10.2

26.2
1.7

7.3


4.6
6.4
17.4

10.1

1.4
0.3

3.2


0.0
2.8

20.7
0.4

6.9


6.1
7.4
17.6

9.7

0.5
0.6

0.7


0.0
0.2

17.5
0.0

6.5


6.5
8.7
14.8

8.3

0.2
0.9

0.3


0.1
0.0

8.1
0*0

5.9


8.5
9.8
12.5

7.9

0.*
2.8

0.2


1.3
0.0

1.7
0.0

4.8


11.5
10.0
8.4

6.0

0.0
2.8

0.1


5.4
0.0

0.*
0.0

2.8


20.3
7.4
3.3

2.4

0.0
2.5

0.0


18.4
0.0

0.0
0.0

3.2


18.6
8.0
4.4

2.6

0.0
2.4

0.*


15.4
0.0

0.0
0.0

3.6


17.0
7.0
6.1

3.6

0.0
1.5

0.1


3.4
0.0

0.5
0.0

5.1


12.0
8.4
10.6

5.9

0.1
0.6

0.5


0.1
0.0

5.7
0.0

7.0


6.0
6.2
17.8

10.3

1.0
0.3

3.0


0.0
1.1

17.9
0.1

7.5


4.9
5.6
20.5

11.3

2.2
0.1

5.9


0.0
6.8

25.5
1.0

5.7


120.3
89.7
155.1

89.9

7.6
14.8

20.1


44.0
21.2

123.9
3.3
AV. STATION PRES. (mb)
23
919.9
917.9
914.4
914.4
913.4
913.8
914.4
914.4
915.8
917.7
918.4
920.0
916.2
RELATIVE HUMIDITY (%)
Hour 04
Hour 10 (Local Time)
Hour 16
Hour 22

56
56
56
56

81
74
71
80

80
68
60
77

74
55
44
68

70
47
36
61

70
45
34
59

67
41
30
52

54
33
22
39

52
33
23
40

59
39
29
49

67
47
39
60

78
65
60
75

81
74
71
81

69
52
43
62
PRECIPITATION (in.)
Water Equivalent
-Normal
-Maximum Monthly
-Year
-Minimum Monthly
-Year
-Maximum in 24 hrs
-Year
Snow, Ice Pellets, Hail
-Maximum Monthly
-Year
-Maximum in 24 hrs
-Year



56

56

56


56

56



1.45
3.87
1970
0.12
1949
1.48
1953

21.4
1964
8.5
1950


1.07
3.70
1986
0.19
1964
1.00
1951

25.2
1949
13.0
1949


1.29
3.46
1989
0.17
1994
1.65
1981

11.9
1951
6.4
1952


1.24
3.04
1955
0.09
1949
1.27
1969

8.0
1967
7.2
1969


1.08
4.07
1990
T
1992
2.05
1990

4.0
1964
4.0
1964


0.81
3.41
1941
0.01
1966
2.24
1958

T
1995
T
1995


0.35
1.62
1982
0.00
1947
0.94
1960

T
1995
T
1995


0.43
2.37
1968
T
1994
1.61
1979

T
1989
T
1989


0.80
2.93
1986
0.00
1987
1.74
1976

0.0

0.0



0.75
2.25
1956
0.00
1988
0.76
1947

2.7
1971
1.7
1971


1.48
3.36
1988
0.14
1976
0.88
1971

18.6
1985
6.5
1964


1.36
4.23
1983
0.09
1976
1.16
1955

26.2
1983
6.7
1983.


12.11
4.23
DEC 1983
0.00
OCT 1988
2.24
JUN 1958

26.2
DEC 1983
13.0
FEB 1949
WIND
Mean Speed (mph)
Prevailing Direction
through 1964
Fastest Mile
-Direction(!!)
-Speed(mph)
-Year
Peak Gust
-Direction(!!)
-Speed(mph)
-Date

56



54
54


12
12


8.0

SE

SE
50
1941

N
59
1986

8.9

SE

W
56
1954

W
45
1989

9.9

SE

W
52
1957

NW
53
1994

9.9

SE

W
50
1942

W
58
1986

9.4

NW

W
50
1954

NW
49
1992

9.0

NW

SW
50
1948

NW
54
1987

8.4

NW

W
61
1944

S
71
1987

8.2

NW

SE
56
1963

W
54
1984

8.2

SE

SE
50
1960

SW
49
1995

8.3

SE

SE
56
1950

NW
47
1995

8.4

SE

NW
57
1953

SW
54
1984

8.1

SE

NW
56
1950

23
47
1995

8.7

SE

W
61
JUL 1944

S
71
JUL 1987
(a) - Length of Record in Years, although individual months may be missing.
0.* or * - The value is between 0.0 and 0.05.
Normals - Based on the 1961 - 1990 record period.
Extremes - Dates are the most recent occurrence.
Wind Dir.- Numerals show tens of degrees clockwise from true north. "00" indicates calm.
Resultant Directions are given to whole degrees.