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

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Story Published: Oct 4, 2006 at 1:39 PM PST

Story Updated: Apr 2, 2009 at 1:45 PM PST

By Scott Sistek

This chart will show how many times it has rained on any given day over the past 116 years (Jan. 1, 1893 - Dec. 31, 2008)

Combination of Seattle-Tacoma Airport and Federal Building

Day

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sept

Oct

Nov

Dec

1

72

64

60

56

52

35

27

10

31

38

54

80

2

67

64

67

58

49

34

29

13

26

45

62

69

3

75

69

65

55

45

33

31

15

29

38

67

69

4

77

67

53

57

44

37

33

9

29

40

68

70

5

69

59

62

60

44

38

26

16

34

38

63

76

6

67

64

45

58

42

42

25

19

26

44

65

65

7

70

64

58

59

34

36

25

14

29

52

74

68

8

76

58

66

44

46

37

21

10

30

42

64

66

9

75

67

66

50

49

44

18

13

25

51

77

74

10

68

67

60

50

44

38

24

12

32

54

74

74

11

67

61

67

58

48

42

24

12

26

43

70

74

12

72

59

67

56

34

41

16

13

26

45

72

66

13

78

67

64

57

42

47

21

19

33

51

72

66

14

72

72

57

53

40

37

19

19

40

51

64

72

15

68

72

62

57

39

27

18

25

27

47

80

71

16

75

75

63

55

49

40

23

22

35

51

72

67

17

73

70

64

51

47

33

15

23

34

49

69

64

18

70

53

57

58

43

35

13

27

36

44

61

64

19

56

61

64

59

46

33

15

19

36

52

86

72

20

70

67

63

46

35

36

11

16

38

52

65

67

21

66

59

63

47

41

29

11

19

29

47

62

75

22

65

65

64

50

36

33

11

24

32

51

60

67

23

72

65

70

46

34

31

13

22

28

47

74

70

24

73

64

62

45

42

35

11

23

31

55

73

68

25

67

60

58

42

49

25

15

29

36

51

68

67

26

63

56

55

39

48

30

16

25

39

51

59

62

27

61

68

59

47

48

36

11

27

33

54

64

73

28

69

66

64

50

44

34

11

24

34

56

61

73

29

66

 

64

52

38

32

11

28

37

61

77

78

30

66

 

57

40

39

30

9

24

42

60

77

63

31

62

 

58

 

39

 

 12

31

 

 62

 

65

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:


Jan Feb Mar Apr May Jun Jul Aug Sept Oct Nov Dec
1 62.1 55.2 51.7 48.3 44.8 30.2 23.3 8.6 26.7 32.8 46.5 69.0
2 57.8 55.2 57.8 50.0 42.2 29.3 25.0 11.2 22.4 38.8 53.4 59.5
3 64.7 59.5 56.0 47.4 38.8 28.4 26.7 12.9 25.0 32.8 57.8 59.5
4 66.4 57.8 45.7 49.1 37.9 31.9 28.4 7.8 25.0 34.5 58.6 60.3
5 59.5 50.9 53.4 51.7 37.9 32.8 22.4 13.8 29.3 32.8 54.3 65.5
6 57.8 55.2 38.8 50.0 36.2 36.2 21.6 16.4 22.4 37.9 56.0 56.0
7 60.3 55.2 50.0 50.9 29.3 31.0 21.6 12.1 25.0 44.8 63.8 58.6
8 65.5 50.0 56.9 37.9 39.7 31.9 18.1 8.6 25.9 36.2 55.2 56.9
9 64.7 57.8 56.9 43.1 42.2 37.9 15.5 11.2 21.6 44.0 66.4 63.8
10 58.6 57.8 51.7 43.1 37.9 32.8 20.7 10.3 27.6 46.5 63.8 63.8
11 57.8 52.6 57.8 50.0 41.4 36.2 20.7 10.3 22.4 37.1 60.3 63.8
12 62.1 50.9 57.8 48.3 29.3 35.3 13.8 11.2 22.4 38.8 62.1 56.9
13 67.2 57.8 55.2 49.1 36.2 40.5 18.1 16.4 28.4 44.0 62.1 56.9
14 62.1 62.1 49.1 45.7 34.5 31.9 16.4 16.4 34.5 44.0 55.2 62.1
15 58.6 62.1 53.4 49.1 33.6 23.3 15.5 21.6 23.3 40.5 69.0 61.2
16 64.7 64.7 54.3 47.4 42.2 34.5 19.8 19.0 30.2 44.0 62.1 57.8
17 62.9 60.3 55.2 44.0 40.5 28.4 12.9 19.8 29.3 42.2 59.5 55.2
18 60.3 45.7 49.1 50.0 37.1 30.2 11.2 23.3 31.0 37.9 52.6 55.2
19 48.3 52.6 55.2 50.9 39.7 28.4 12.9 16.4 31.0 44.8 74.1 62.1
20 60.3 57.8 54.3 39.7 30.2 31.0 9.5 13.8 32.8 44.8 56.0 57.8
21 56.9 50.9 54.3 40.5 35.3 25.0 9.5 16.4 25.0 40.5 53.4 64.7
22 56.0 56.0 55.2 43.1 31.0 28.4 9.5 20.7 27.6 44.0 51.7 57.8
23 62.1 56.0 60.3 39.7 29.3 26.7 11.2 19.0 24.1 40.5 63.8 60.3
24 62.9 55.2 53.4 38.8 36.2 30.2 9.5 19.8 26.7 47.4 62.9 58.6
25 57.8 51.7 50.0 36.2 42.2 21.6 12.9 25.0 31.0 44.0 58.6 57.8
26 54.3 48.3 47.4 33.6 41.4 25.9 13.8 21.6 33.6 44.0 50.9 53.4
27 52.6 58.6 50.9 40.5 41.4 31.0 9.5 23.3 28.4 46.5 55.2 62.9
28 59.5 56.9 55.2 43.1 37.9 29.3 9.5 20.7 29.3 48.3 52.6 62.9
29 56.9   55.2 44.8 32.8 27.6 9.5 24.1 31.9 52.6 66.4 67.2
30 56.9   49.1 34.5 33.6 25.9 7.8 20.7 36.2 51.7 66.4 54.3
31 53.4   50.0   33.6   10.3 26.7   53.4   56.0

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