OK40 Coop Summary

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Cooperative Observer Station Summary

HELENA 1 SSE (344019)
*

ALFALFA County

Climate Division: 2
*

Latitude: 3632N;     Longitude: 09817W

Elevation: 1349 ft
*

Precipitation Period of Record:

1906/01-2010/10 ( 69%)
*

Temperature Period of Record:

1906/01-2010/10 ( 52%)

 

Monthly Averages (1971-2000)

 

Temperature (deg Fahrenheit)

Precipitation (inches)

Snowfall and Sleet (inches)

 

Daily Max

Daily Min

Daily Avg

Monthly Average

Monthly Average

January

44.0
21.0
32.3
.96
4.2

February

50.1
25.5
37.6
1.29
4.7

March

59.7
34.5
46.8
2.89
2.9

April

69.5
43.4
56.2
2.66
.6

May

78.8
54.1
66.2
4.59
.0

June

88.9
64.0
76.2
3.86
.0

July

94.8
68.9
81.7
3.20
.0

August

93.5
67.4
80.2
3.04
.0

September
84.6
59.2
71.7
3.04
.0

October

72.9
46.6
59.5
2.65
.1

November

57.4
33.7
45.3
2.04
1.4

December

46.7
24.3
35.3
1.29
4.3

Annual

70.2
45.2
57.4
31.43
17.8

Average Number of Days Per Month (1971-2000)

 

Temperature

Precipitation

Snowfall and Sleet

 

Max>100

Max>90

Max<32

Min<32

Min<0

any

meas

0.10"+

0.25"+

0.50"+

1.00"+

any

meas

0.50"+

1.00"+

Glazing

Jan
0
0
7
28
1
7
4
2
1
1
*
4
2
2
2
4

Feb
0
*
4
21
1
7
4
3
2
1
*
3
1
1
1
3

Mar
0
*
1
13
0
9
6
5
3
2
1
2
1
1
1
2

Apr
0
*
0
3
0
9
7
5
3
2
1
*
*
*
*
*

May
*
3
0
0
0
10
8
7
5
3
1
0
0
0
0
0

Jun
2
15
0
0
0
9
8
6
4
3
1
0
0
0
0
0

Jul
8
25
0
0
0
7
6
5
3
2
1
0
0
0
0
0

Aug
7
23
0
0
0
8
7
5
3
2
1
0
0
0
0
0

Sep
2
11
0
*
0
8
7
5
3
2
1
0
0
0
0
0

Oct
0
1
0
2
0
7
6
4
3
2
1
*
*
*
*
*

Nov
0
0
1
14
0
8
6
3
2
1
*
1
*
*
*
1

Dec
0
0
4
26
1
7
5
3
2
1
*
3
2
2
2
3

Ann
19
79
16
108
3
93
73
51
34
20
9
13
6
6
6
12

Exceedence Values (2 in 10 years)

Month

Maximum Temperature Higher Than:

Minimum Temperature Lower Than:

Precipitation Less Than:

Precipitation Greater Than:

January

74
-3
.16
1.44

February

77
1
.30
2.27

March

87
12
.55
3.61

April

90
25
1.09
3.83

May

97
37
1.64
6.97

June

102
49
1.72
6.36

July

108
57
1.49
4.73

August

106
55
1.15
5.94

September
103
40
.82
4.84

October

94
27
.72
3.82

November

82
15
.15
2.91

December

72
2
.32
1.96

Annual

109
-4
21.90
37.12

Monthly Extremes

 

Temperature (F) (1906-2010)

Precipitation (inches) (1906-2010)

Snowfall (1906-2010)

 

Record High

Record Low

Monthly Max

Daily Max

Monthly Max

Daily Max

Greatest Depth

Jan
82
(23rd, 1967)
-14
( 8th, 1988)
3.82" (2005)
2.69" ( 5th, 2005)
19.0" (1979)
8.0" (30th, 1942)
14.0" ( 7th, 1988)

Feb
92
(13th, 1962)
-15
( 6th, 1982)
3.61" (1997)
2.55" (21st, 1997)
27.0" (1971)
19.0" (22nd, 1971)
24.0" (22nd, 1971)

Mar
99
(19th, 1907)
0
( 3rd, 2002)
10.10" (1973)
4.90" ( 3rd, 1988)
18.0" (1988)
12.0" ( 9th, 1994)
13.0" (18th, 1988)

Apr
99
(13th, 1972)
18
( 3rd, 1975)
9.97" (2009)
7.12" (26th, 2009)
12.0" (1973)
6.0" ( 8th, 1973)
10.0" ( 9th, 1973)

May
105
(31st, 1985)
29
( 6th, 1944)
11.12" (1993)
4.37" (29th, 1960)
.0" (1945)
.0" (15th, 1945)
.0" -

Jun
113
(25th, 1911)
44
(18th, 1914)
10.91" (1957)
5.45" (23rd, 1963)
.0" (1953)
.0" ( 9th, 1951)
.0" -

Jul
113
(30th, 1986)
50
(14th, 1990)
11.76" (1960)
6.55" (20th, 1997)
.0" (1953)
.0" ( 4th, 1953)
.0" -

Aug
112
( 7th, 1964)
48
(29th, 1988)
8.92" (1989)
3.34" ( 3rd, 1995)
.0" (1954)
.0" (31st, 1954)
.0" -

Sep
108
( 4th, 2000)
31
(30th, 1984)
10.13" (2008)
8.74" (12th, 2008)
.0" (1950)
.0" (17th, 1950)
.0" -

Oct
98
( 1st, 1979)
12
(31st, 1993)
11.08" (2002)
5.00" ( 3rd, 1986)
2.0" (1991)
2.0" (31st, 1991)
2.0" (31st, 1991)

Nov
91
( 9th, 2006)
5
(26th, 1975)
7.01" (1964)
4.10" ( 3rd, 1974)
16.0" (1972)
8.0" (19th, 1972)
10.0" (19th, 1972)

Dec
78
( 8th, 1966)
-15
(23rd, 1989)
3.66" (1997)
2.90" ( 4th, 1947)
21.0" (1987)
10.0" (11th, 1974)
16.0" (15th, 1987)

Annual
113
(Jun 25, 1911)
-15
(Feb 6, 1982)
11.76" (Jul 1960)
8.74" (Sep 12, 2008)
27.0" (Feb 1971)
19.0" (Feb 22, 1971)
24.0" (Feb 22, 1971)

First Freezing Temperature in Fall

Probability

24 F or Lower

28 F or Lower

32 F or Lower

1 Year in 10

October  30
October  24
October  16

2 Years in 10
November   4
October  29
October  20

5 Years in 10
November  20
November  10
October  29

Last Freezing Temperature in Spring

Probability

24 F or Lower

28 F or Lower

32 F or Lower

1 Year in 10

April   8
April  14
April  30

2 Years in 10
March  30
April   9
April  17

5 Years in 10
March  20
April   2
April  10

Number of Days in Growing Season

Probability

Higher Than 24 F

Higher Than 28 F

Higher Than 32 F

9 Years in 10
221
198
181

8 Years in 10
226
210
189

5 Years in 10
244
223
200

2 Years in 10
261
244
214

1 Year in 10

273
253
223

Precipitation Quantiles (Inches)

PERCENT

JAN

FEB

MAR

APR

MAY

JUN

JUL

AUG

SEP

OCT

NOV

DEC

ANNUAL

MEAN
.96
1.29
2.89
2.66
4.59
3.86
3.20
3.04
3.04
2.65
2.04
1.29
31.43

10%
.07
.18
.27
.78
1.20
1.13
.56
.85
.46
.34
.03
.21
18.09

20%
.16
.30
.55
1.09
1.64
1.72
1.49
1.15
.82
.72
.15
.32
21.90

30%
.27
.46
.90
1.56
2.32
2.30
1.97
1.57
1.54
1.11
.53
.44
24.66

40%
.39
.67
1.26
1.76
2.93
2.94
2.16
1.90
2.03
1.43
.76
.80
26.91

50%
.58
.80
1.71
2.26
3.78
3.41
2.50
2.45
2.21
2.22
1.00
1.01
29.59

60%
.85
1.13
2.22
2.58
4.79
4.42
3.02
3.60
2.86
2.67
1.50
1.17
31.17

70%
1.21
1.69
2.63
3.18
5.35
5.27
3.76
4.50
3.77
3.31
1.98
1.55
33.80

80%
1.44
2.27
3.61
3.83
6.97
6.36
4.73
5.94
4.84
3.82
2.91
1.96
37.12

90%
1.97
2.74
4.76
5.58
8.38
7.64
6.88
6.64
6.04
5.82
4.04
2.79
40.82