CASPER, WYOMING
NORMALS, MEANS, AND EXTREMES

LATITUDE: 42 55' N LONGITUDE: 106 28' W ELEVATION: FT. GRND 5338 BARO 5323 TIME ZONE: MOUNTAIN WBAN: 24089

(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






45

45



32.8
12.0
22.4

60
1971
-40
1972


37.0
16.0
26.5

68
1982
-29
1989


45.2
21.8
33.5

74
1986
-21
1965


56.1
29.5
42.8

84
1992
-4
1966


66.6
37.9
52.3

92
1984
16
1953


78.6
46.9
62.7

102
1990
28
1969


87.6
54.0
70.8

104
1954
30
1972


85.7
51.8
68.7

102
1979
33
1977


73.8
41.6
57.8

97
1995
16
1983


60.5
32.2
46.4

87
1993
-3
1971


44.3
21.8
33.1

71
1983
-21
1985


33.9
13.7
23.8

63
1995
-41
1990


58.5
31.6
45.1

104
JUL 1954
-41
DEC 1990
NORMAL DEGREE DAYS
Heating (base 65 Deg. F)
Cooling (base 65 Deg. F)




1321
0

1078
0

977
0

666
0

394
0

139
70

10
190

36
151

250
34

577
0

957
0

1277
0

7682
445
% OF POSSIBLE SUNSHINE














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

45


45
45
45

45

45
45

45


31
31

31
31

6.6


7.0
8.1
16.0

7.1

3.5
0.0

0.8


0.0
12.9

29.3
6.5

6.5


6.3
8.5
13.5

7.9

3.6
0.*

0.6


0.0
8.3

26.2
3.5

6.8


5.6
8.9
16.4

9.5

4.0
0.3

0.9


0.0
4.1

26.4
1.3

6.8


5.5
8.9
15.6

10.3

3.3
1.4

1.3


0.0
1.1

19.0
0.1

6.6


5.7
10.6
14.8

11.1

1.0
6.4

0.9


0.1
0.1

6.7
0.0

5.3


9.9
11.2
8.9

8.6

0.1
8.4

0.4


4.5
0.0

0.3
0.0

4.3


13.8
11.0
6.2

7.9

0.0
9.1

0.3


12.5
0.0

0.*
0.0

4.5


13.2
10.9
6.9

5.7

0.0
7.0

0.3


11.3
0.0

0.0
0.0

4.6


13.1
8.7
8.2

6.5

0.4
3.0

0.6


1.5
0.1

3.8
0.0

5.3


11.3
8.1
11.6

6.6

1.8
0.4

0.9


0.0
0.8

15.4
0.11

6.4


7.2
8.5
14.4

7.1

3.3
0.1

0.9


0.0
6.0

24.8
1.8

6.2


8.2
8.3
14.5

7.5

3.1
0.0

0.7


0.0
12.3

28.6
5.1

5.8


106.7
111.5
147.0

95.8

24.2
36.2

8.7


29.8
45.7

180.5
18.5
AV. STATION PRES. (mb)
23
835.9
835.9
833.7
834.8
835.5
837.3
839.6
839.7
839.5
838.5
836.3
836.1
836.9
RELATIVE HUMIDITY (%)
Hour 04
Hour 10 (Local Time)
Hour 16
Hour 22

31
31
31
31

69
59
61
69

70
58
57
70

73
52
47
69

75
47
42
68

78
44
40
69

76
38
33
63

70
32
27
55

67
31
25
53

67
36
30
58

68
44
41
64

69
54
57
67

68
58
62
67

71
46
44
64
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



45

45

45


45

45



0.55
1.42
1987
T
1952
0.82
1987

24.0
1987
14.0
1987


0.60
1.42
1987
0.15
1957
0.60
1995

23.8
1952
11.0
1987


0.95
2.43
1954
0.25
1953
1.00
1958

36.2
1975
14.6
1954


1.56
3.92
1974
0.08
1992
3.00
1974

56.3
1973
16.5
1973


2.13
6.46
1978
0.30
1966
2.61
1978

24.6
1978
14.1
1950


1.46
4.15
1982
0.03
1956
2.34
1982

3.0
1969
3.0
1969


1.26
3.05
1951
0.09
1991
2.07
1983

T
1994
T
1994


0.67
2.66
1979
0.02
1950
1.74
1979

T
1993
T
1993


0.94
3.40
1982
0.07
1956
2.04
1989

11.5
1982
6.9
1995


0.97
4.17
1994
T
1965
2.49
1962

16.1
1986
13.3
1986


0.77
2.72
1983
0.07
1965
1.21
1983

37.1
1983
14.3
1983


0.66
3.71
1982
0.03
1952
1.64
1982

62.8
1982
31.1
1982


12.52
6.46
MAY 1978
T
OCT 1965
3.00
APR 1974

62.8
DEC 1982
31.1
DEC 1982
WIND
Mean Speed (mph)
Prevailing Direction
through 1964
Fastest Mile
-Direction(!!)
-Speed(mph)
-Year
Peak Gust
-Direction(!!)
-Speed(mph)
-Date

45



42



12
12


16.3

SW

20
58
1954

SW
67
1990

15.0

SW

23
58
1957

SW
64
1986

13.8

SW

25
81
1956

NW
63
1988

12.6

WSW

25
54
1967

W
60
1994

11.6

WSW

32
58
1959

SW
64
1985

11.0

WSW

36
52
1959

W
64
1991

10.1

WSW

25
52
1974

NW
60
1990

10.3

SW

25
50
1954

SW
62
1988

10.9

WSW

32
53
1965

SW
63
1986

12.0

SW

25
55
1954

SW
62
1985

14.4

SW

25
49
1970

SW
60
1984

16.0

SW

20
63
1955

SW
66
1984

12.8

SW

25
81
MAR 1956

SW
67
JAN 1990
(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.