OK26 Coop Summary

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Cooperative Observer Station Summary

DUNCAN (342660)
*

STEPHENS County

Climate Division: 8
*

Latitude: 3430N;     Longitude: 09758W

Elevation: 1124 ft
*

Precipitation Period of Record:

1936/11-2010/10 ( 94%)
*

Temperature Period of Record:

1936/10-2010/10 ( 95%)

 

Monthly Averages (1971-2000)

 

Temperature (deg Fahrenheit)

Precipitation (inches)

Snowfall and Sleet (inches)

 

Daily Max

Daily Min

Daily Avg

Monthly Average

Monthly Average

January

NA
NA
NA
1.39
1.5

February

56.8
32.6
44.5
1.82
1.0

March

NA
NA
NA
2.74
.2

April

73.2
49.5
61.1
3.39
.0

May

NA
NA
NA
5.15
.0

June

NA
NA
NA
4.56
.0

July

NA
NA
NA
NA
.0

August

93.7
70.5
81.9
2.43
.0

September
85.9
63.0
74.2
3.86
.0

October

76.3
51.8
63.8
3.91
.0

November

62.6
40.0
51.0
2.31
.2

December

NA
NA
NA
2.03
.3

Annual

NA
NA
NA
NA
3.1

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
NA
NA
NA
NA
NA
6
5
3
2
1
*
1
1
1
*
1

Feb
0
*
2
13
*
6
5
3
2
1
*
1
1
*
*
1

Mar
NA
NA
NA
NA
NA
7
6
4
3
2
1
*
*
*
*
*

Apr
*
*
0
1
0
7
7
5
4
2
1
0
0
0
0
0

May
NA
NA
NA
NA
NA
9
8
6
4
3
2
0
0
0
0
0

Jun
NA
NA
NA
NA
NA
8
7
5
4
3
2
0
0
0
0
0

Jul
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
0
0
0
0
0

Aug
5
25
0
0
0
7
6
4
3
2
1
0
0
0
0
0

Sep
1
12
0
0
0
7
7
5
4
2
1
0
0
0
0
0

Oct
*
2
0
*
0
7
7
5
3
2
1
*
*
*
0
*

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

Dec
NA
NA
NA
NA
NA
7
6
3
2
1
1
*
*
*
*
*

Ann
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
3
2
1
1
3

Exceedence Values (2 in 10 years)

Month

Maximum Temperature Higher Than:

Minimum Temperature Lower Than:

Precipitation Less Than:

Precipitation Greater Than:

January

76
5
.28
2.44

February

82
11
.57
2.59

March

89
17
1.09
3.69

April

93
30
1.25
4.91

May

98
42
2.38
8.45

June

101
54
1.98
6.22

July

106
61
.51
4.98

August

107
59
1.00
4.04

September
102
44
1.05
5.52

October

96
32
1.42
5.65

November

84
20
.49
3.57

December

77
9
.47
2.45

Annual

107
2
26.54
41.29

Monthly Extremes

 

Temperature (F) (1936-2010)

Precipitation (inches) (1936-2010)

Snowfall (1936-2010)

 

Record High

Record Low

Monthly Max

Daily Max

Monthly Max

Daily Max

Greatest Depth

Jan
84
(25th, 1950)
-8
( 3rd, 1947)
4.83" (1946)
2.01" (30th, 1982)
15.9" (1966)
10.0" ( 7th, 1988)
13.0" ( 7th, 1988)

Feb
90
(23rd, 1996)
-2
( 2nd, 1985)
7.61" (1938)
3.42" (15th, 1938)
11.7" (1968)
6.3" (23rd, 1968)
5.0" (15th, 1951)

Mar
97
(31st, 1940)
2
(11th, 1948)
7.93" (2007)
4.50" (31st, 2007)
6.0" (1937)
6.0" (29th, 1937)
6.0" (29th, 1937)

Apr
100
(12th, 1972)
21
( 7th, 2009)
9.59" (1990)
3.80" (24th, 2004)
1.0" (1938)
1.0" ( 7th, 1938)
1.0" ( 7th, 1938)

May
104
(22nd, 1939)
34
( 1st, 1960)
15.22" (1950)
9.85" (19th, 1955)
.0" (1961)
.0" ( 2nd, 1961)
.0" -

Jun
111
(28th, 1980)
47
( 1st, 1964)
14.88" (2007)
4.40" ( 5th, 1985)
.0" -
.0" -
.0" -

Jul
110
(28th, 1946)
55
( 8th, 1952)
8.02" (1960)
4.32" (14th, 1989)
.0" -
.0" -
.0" -

Aug
111
( 9th, 1970)
55
(26th, 1962)
8.54" (1966)
6.82" (19th, 2007)
.0" -
.0" -
.0" -

Sep
108
( 2nd, 1939)
36
(27th, 1942)
10.07" (1991)
4.43" (23rd, 1970)
.0" -
.0" -
.0" -

Oct
102
( 1st, 1977)
19
(31st, 1993)
15.70" (1941)
5.70" (30th, 1941)
.5" (1993)
.5" (30th, 1993)
.0" -

Nov
90
( 6th, 1945)
14
(15th, 1940)
8.87" (2004)
2.76" ( 5th, 1994)
5.5" (2001)
5.5" (29th, 2001)
3.0" (17th, 1980)

Dec
88
(24th, 1955)
-7
(24th, 1989)
6.92" (1991)
2.80" (20th, 1991)
9.6" (1958)
8.0" (25th, 2009)
8.0" (25th, 2009)

Annual
111
(Jun 28, 1980)
-8
(Jan 3, 1947)
15.70" (Oct 1941)
9.85" (May 19, 1955)
15.9" (Jan 1966)
10.0" (Jan 7, 1988)
13.0" (Jan 7, 1988)

First Freezing Temperature in Fall

Probability

24 F or Lower

28 F or Lower

32 F or Lower

1 Year in 10

November   9
November   4
October  26

2 Years in 10
November  16
November   9
November   1

5 Years in 10
November  29
November  19
November   9

Last Freezing Temperature in Spring

Probability

24 F or Lower

28 F or Lower

32 F or Lower

1 Year in 10

March  25
April   7
April  12

2 Years in 10
March  16
March  28
April   7

5 Years in 10
March   4
March  15
March  28

Number of Days in Growing Season

Probability

Higher Than 24 F

Higher Than 28 F

Higher Than 32 F

9 Years in 10
240
225
209

8 Years in 10
248
231
211

5 Years in 10
273
248
224

2 Years in 10
289
265
239

1 Year in 10

303
276
246

Precipitation Quantiles (Inches)

PERCENT

JAN

FEB

MAR

APR

MAY

JUN

JUL

AUG

SEP

OCT

NOV

DEC

ANNUAL

MEAN
1.39
1.82
2.74
3.39
5.15
4.56
NA
2.43
3.86
3.91
2.31
2.03
NA

10%
.05
.32
.47
.80
1.34
1.34
.15
.42
.36
.68
.11
.25
23.81

20%
.28
.57
1.09
1.25
2.38
1.98
.51
1.00
1.05
1.42
.49
.47
26.54

30%
.38
.95
1.49
1.59
3.60
2.49
.92
1.34
1.89
1.90
.87
.73
29.14

40%
.95
1.13
1.84
2.09
4.42
2.93
1.56
1.77
2.58
2.36
1.14
1.08
31.33

50%
1.21
1.53
2.27
2.75
5.04
3.62
2.01
2.31
2.97
2.76
1.52
1.26
33.12

60%
1.57
1.81
2.50
3.38
5.85
4.47
2.65
3.04
3.91
3.60
2.01
1.81
36.13

70%
1.97
2.20
3.03
4.08
6.56
5.17
3.18
3.48
4.50
4.46
2.61
2.14
39.17

80%
2.44
2.59
3.69
4.91
8.45
6.22
4.98
4.04
5.52
5.65
3.57
2.45
41.29

90%
2.88
3.56
4.58
6.07
10.26
7.66
6.00
5.62
7.99
6.87
4.71
4.05
44.61