What are the odds it'll rain on any given day?

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By Scott Sistek

Story Published: Oct 4, 2006 at 2:39 PM PDT

Story Updated: May 28, 2010 at 1:08 PM PDT

This chart will show how many times it has rained on any given day over the past 117 years (Jan. 1, 1893 - Dec. 31, 2009)

Combination of Seattle-Tacoma Airport and Federal Building

Day

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sept

Oct

Nov

Dec

1

73

64

61

57

52

35

27

10

31

38

54

80

2

68

64

68

59

50

34

29

13

26

46

63

69

3

75

69

66

56

46

33

31

15

30

38

67

69

4

78

67

54

57

45

37

33

9

29

40

68

71

5

70

60

63

60

45

38

26

16

35

38

64

76

6

68

65

45

58

43

42

25

19

27

44

66

65

7

71

64

59

59

34

36

25

14

30

52

75

68

8

77

59

67

44

46

37

21

10

30

42

65

66

9

75

68

67

51

49

44

18

14

26

51

78

74

10

69

68

60

51

45

38

24

13

32

54

75

74

11

68

61

67

59

49

42

25

13

26

43

71

74

12

73

59

67

57

35

41

17

14

26

45

72

66

13

78

67

64

58

43

47

21

20

33

52

73

66

14

72

72

58

54

41

37

19

19

40

52

64

73

15

68

72

63

57

39

27

18

25

27

48

81

72

16

75

75

64

56

49

40

23

22

36

52

73

68

17

73

70

65

52

47

33

15

23

34

50

70

65

18

70

53

57

58

44

36

13

27

36

45

62

65

19

56

61

65

59

47

34

15

19

37

52

87

73

20

70

67

64

46

35

36

11

16

38

52

66

68

21

66

59

63

47

41

30

11

19

29

48

63

76

22

65

66

65

51

36

34

11

24

32

52

61

68

23

72

66

71

47

34

31

13

22

28

48

75

70

24

74

65

63

45

42

35

11

23

31

55

74

68

25

68

61

59

42

49

26

15

30

36

52

69

67

26

63

57

55

39

48

30

16

25

39

52

60

62

27

62

68

59

47

48

36

11

27

33

54

64

73

28

69

66

65

51

44

34

11

25

34

57

61

73

29

66

 

65

52

38

32

11

29

38

62

77

79

30

66

 

57

40

39

30

9

24

42

61

78

64

31

63

 

59

 

39

 

 12

31

 

 63

 

66

Blue numbers --  wettest days of month
 Red numbers -- driest days of the month
Green number -- wettest day of the year
 Orange number -- driest day of the year.

Information supplied by the National Weather Service Seattle

And here is the same chart, given as a percent chance instead of numerical counter for each year:

Day Jan Feb Mar Apr May Jun Jul Aug Sept Oct Nov Dec
1 62.3 54.7 52.1 48.7 44.4 29.9 23.1 8.5 26.5 33.3 46.1 68.3
2 58.1 54.7 58.1 50.4 42.7 29.0 24.8 11.1 22.2 39.3 53.8 58.9
3 64.1 58.9 56.4 47.8 39.3 28.2 26.5 12.8 25.6 32.5 57.2 58.9
4 66.6 57.2 46.1 48.7 38.4 31.6 28.2 7.7 24.8 34.2 58.1 60.6
5 59.8 51.2 53.8 51.2 38.4 32.5 22.2 13.7 29.9 32.5 54.7 64.9
6 58.1 55.5 38.4 49.5 36.7 35.9 21.4 16.2 31.6 37.6 56.4 55.5
7 60.6 54.7 50.4 50.4 29.0 30.7 21.4 12.0 25.6 44.4 64.1 58.1
8 65.8 50.4 57.2 37.6 39.3 31.6 17.9 8.5 25.6 35.9 55.5 56.4
9 64.1 58.1 57.2 43.6 41.8 37.6 15.4 12.0 22.2 43.6 66.6 63.2
10 58.9 58.1 51.2 43.6 38.4 32.5 20.5 11.1 27.3 46.1 64.1 63.2
11 58.1 52.1 57.2 50.4 41.8 35.9 21.4 11.1 22.2 36.7 60.6 63.2
12 62.3 50.4 57.2 48.7 29.9 35.0 14.5 12.0 22.2 38.4 61.5 56.4
13 66.6 57.2 54.7 49.5 36.7 40.1 17.9 17.1 28.2 44.4 62.3 56.4
14 61.5 61.5 49.5 46.1 35.0 31.6 16.2 16.2 34.2 44.4 54.7 62.3
15 58.1 62.3 53.8 48.7 33.3 23.1 15.4 21.4 23.1 41.0 69.2 61.5
16 64.1 64.1 54.7 47.8 41.8 34.2 19.6 18.8 30.7 44.4 62.3 58.1
17 62.3 59.8 55.5 44.4 40.1 28.2 12.8 19.6 29.0 42.7 59.8 55.5
18 59.8 45.3 48.7 49.5 37.6 30.7 11.1 23.1 30.7 38.4 52.9 55.5
19 47.8 52.1 55.5 50.4 40.1 29.0 12.8 16.2 31.6 44.4 74.3 62.3
20 59.8 57.2 54.7 39.3 29.9 30.7 9.4 13.7 32.5 44.4 56.4 58.1
21 56.4 50.4 53.8 40.1 35.0 25.6 9.4 16.2 24.8 41.0 53.8 64.9
22 55.5 56.4 55.5 43.6 30.7 29.0 9.4 20.5 27.3 44.4 52.1 58.1
23 61.5 56.4 60.6 40.1 29.0 26.5 11.1 18.8 23.9 41.0 64.1 59.8
24 63.2 55.5 53.8 38.4 35.9 29.9 9.4 19.6 26.5 47.0 63.2 58.1
25 58.1 52.1 50.4 35.9 41.8 22.2 12.8 25.6 30.7 44.4 58.9 57.2
26 53.8 48.7 47.0 33.3 41.0 25.6 13.7 21.4 33.3 44.4 51.2 52.9
27 52.9 58.1 50.4 40.1 41.0 30.7 9.4 23.1 28.2 46.1 54.7 62.3
28 58.9 56.4 55.5 43.6 37.6 29.0 9.4 21.4 29.0 48.7 52.1 62.3
29 56.4 0.0 55.5 44.4 32.5 27.3 9.4 24.8 32.5 52.9 65.8 67.5
30 56.4 0.0 48.7 34.2 33.3 25.6 7.7 20.5 35.9 52.1 66.6 54.7
31 53.8 0.0 50.4 0.0 33.3 0.0 10.2 26.5 0.0 53.8 0.0 56.4

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