GREAT FALLS, MONTANA
NORMALS, MEANS, AND EXTREMES

LATITUDE: 47 Deg. 29 Min. N LONGITUDE: 111 Deg. 22 Min. W ELEVATION: FT. GRND 3663 BARO 3665 TIME ZONE: MOUNTAIN WBAN: 24143

(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



30.6
11.6
21.2

67
1992
-37
1969


37.5
17.2
27.4

70
1992
-35
1989


43.7
22.8
33.3

78
1978
-29
1951


55.3
31.9
43.6

89
1980
-6
1975


65.2
40.9
53.1

93
1980
15
1954


74.6
48.6
61.6

101
1990
31
1950


83.3
53.2
68.2

105
1973
40
1992


81.6
52.2
66.9

106
1969
30
1992


69.6
43.5
56.6

98
1980
21
1985


59.3
35.8
47.5

91
1992
-11
1991


43.5
24.3
33.9

76
1975
-25
1985


33.1
14.6
23.9

69
1939
-43
1968


56.4
33.1
44.8

106
AUG 1969
-43
DEC 1968
NORMAL DEGREE DAYS
Heating (base 65 Deg. F)
Cooling (base 65 Deg. F)




1358
0

1053
0

983
0

642
0

372
0

156
54

37
137

91
150

299
47

543
0

933
0

1274
0

7741
388
% OF POSSIBLE SUNSHINE
46
49
56
66
62
62
65
79
76
67
61
46
44
61
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

52


56
56
56

56

56
56

54


32
32

32
32

7.3


5.3
6.4
19.3

8.9

3.4
0.*

1.2


0.0
13.5

26.9
9.8

7.4


4.2
6.5
17.5

7.8

2.9
0.1

1.5


0.0
8.3

23.8
5.0

7.4


4.0
8.7
18.3

9.4

3.4
0.1

2.2


0.0
5.8

25.2
2.4

7.4


3.9
8.1
18.0

9.0

2.1
0.7

1.6


0.0
1.3

15.6
0.1

7.0


4.6
9.7
16.7

11.5

0.5
3.6

0.8


0.1
0.0

3.3
0.0

6.5


5.5
10.9
13.7

11.8

0.1
6.9

0.6


2.3
0.0

0.1
0.0

4.4


12.9
11.7
6.4

7.6

0.0
7.3

0.3


7.6
0.0

0.0
0.0

4.9


12.0
11.0
8.0

7.7

0.*
6.0

0.4


7.4
0.0

0.1
0.0

5.6


9.7
9.1
11.2

7.3

0.5
1.4

0.6


1.4
0.*

2.6
0.0

6.4


7.1
9.2
14.8

5.8

1.1
0.2

1.2


0.*
1.1

11.2
0.2

7.1


5.0
7.4
17.7

7.1

2.6
0.*

1.9


0.0
5.0

21.7
2.2

7.2


5.0
7.7
18.3

7.8

3.1
0.*

1.0


0.0
11.5

26.4
6.6

6.5


79.1
106.4
179.8

101.4

19.7
26.4

13.2


18.9
46.6

156.9
26.2
AV. STATION PRES. (mb)
21
887.6
887.7
885.5
886.7
886.5
887.1
889.2
889.4
889.7
889.2
887.5
887.5
887.8
RELATIVE HUMIDITY (%)
Hour 04
Hour 10 (Local Time)
Hour 16
Hour 22

32
32
32
32

66
62
60
65

67
58
54
66

68
55
49
65

68
47
41
60

70
46
41
61

71
45
40
60

67
39
31
52

65
39
31
51

67
46
38
58

64
47
43
59

65
55
55
63

65
60
60
65

67
50
45
60
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



0.91
2.05
1969
T
1944
0.74
1966

22.6
1969
10.2
1984


0.57
2.16
1958
0.01
1950
0.88
1951

26.1
1958
11.0
1951


1.10
2.18
1967
0.10
1986
1.14
1977

24.2
1989
11.5
1987


1.41
4.63
1975
0.05
1981
2.43
1951

35.4
1967
16.8
1973


2.52
8.13
1953
0.67
1950
3.42
1980

11.6
1989
11.6
1989


2.39
5.37
1965
0.52
1960
2.74
1964

11.1
1950
11.0
1950


1.24
4.68
1993
0.04
1959
2.40
1983

T
1993
T
1993


1.54
4.90
1985
0.03
1969
2.74
1989

8.3
1992
8.3
1992


1.24
3.56
1941
0.09
1990
1.82
1982

10.4
1984
8.4
1988


0.78
3.43
1975
T
1965
1.15
1954

16.6
1975
8.3
1957


0.66
2.27
1955
0.02
1954
0.97
1946

22.1
1955
10.8
1946


0.85
1.92
1977
T
1954
0.82
1972

25.0
1945
9.8
1945


15.21
8.13
MAY 1953
T
OCT 1965
3.42
MAY 1980

35.4
APR 1967
16.8
APR 1973
WIND
Mean Speed (mph)
Prevailing Direction
through 1964
Fastest Mile
-Direction(!!)
-Speed(mph)
-Year
Peak Gust
-Direction(!!)
-Speed(mph)
-Date

52



47
47


10
10


15.2

SW

SW
65
1946

SW
60
1990

14.2

SW

W
72
1954

W
61
1988

12.9

SW

W
73
1951

W
55
1991

12.8

SW

W
70
1946

W
52
1992

11.3

SW

SW
65
1951

W
60
1988

11.1

SW

NW
70
1980

SE
58
1992

10.0

SW

W
73
1951

SW
77
1990

10.2

SW

SW
71
1954

W
63
1984

11.2

SW

NW
73
1945

SW
61
1984

13.1

SW

W
73
1949

SW
64
1991

14.6

SW

SW
73
1955

SW
61
1990

15.6

SW

SW
82
1956

SW
58
1991

12.7

SW

SW
82
DEC 1956

SW
77
JUL 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.