SEATTLE TACOMA AIRPORT, WA

Total of Precipitation (Inches)

(457473)

File last updated on April 26, 2024
a = 1 day missing, b = 2 days missing, c = 3 days, ..etc..,
z = 26 or more days missing, A = Accumulations present
Long-term means based on columns; thus, the monthly row may not
sum (or average) to the long-term annual value.
MAXIMUM ALLOWABLE NUMBER OF MISSING DAYS : 5
Individual Months not used for annual or monthly statistics if more than 5 days are missing.
Individual Years not used for annual statistics if any month in that year has more than 5 days missing.

YEAR(S)JANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECANN
19454.62 6.14 4.33 3.34 2.62 0.62 0.11 0.31 3.51 2.32 6.31 6.31 40.54
19465.29 5.83 3.71 2.46 0.41 3.90 0.56 0.33 2.58 3.22 5.53 6.47 40.29
19474.20 4.02 2.40 2.17 0.35 2.15 1.04 0.49 1.84 8.95 3.62 6.02 37.25
19484.49 5.25 3.68 3.75 4.76 2.09 1.53 1.87 3.85 2.33 6.06 6.13 45.79
19490.77 5.89 3.54 1.18 1.30 0.93 1.04 0.45 1.43 3.85 6.78 5.30 32.46
19508.91 5.74 8.40 2.92 0.78 0.59 1.00 2.17 2.30 7.21 7.98 7.14 55.14
19516.80 8.76 3.76 0.65 1.61 0.13 0.31 1.02 2.03 5.87 5.44 3.92 40.30
19524.89 2.46 3.52 2.03 0.99 1.04 0.41 0.70 0.32 1.29 1.11 5.02 23.78
195312.92 3.70 3.72 2.10 2.51 1.85 0.66 1.11 3.28 4.43 7.22 5.92 49.42
19548.36 4.38 2.07 2.64 1.89 2.44 1.46 1.57 1.68 1.91 7.67 5.20 41.27
19553.35 4.30 3.25 3.64 1.95 1.27 2.10 0.17 1.52 6.60 8.96 9.50 46.61
19568.67 2.17 4.95 0.33 0.83 2.47 0.33 0.76 2.42 6.71 1.59 5.62 36.85
19572.41 5.57 6.26 2.23 1.17 1.18 1.10 1.64 0.76 3.79 3.00 5.52 34.63
19588.72 5.36 2.26 3.51 0.94 0.90 0.00 0.31 1.42 3.99 8.07 7.15 42.63
19597.98 3.64 4.12 3.59 1.60 1.82 0.93 0.60 4.60 2.67 8.14 6.83 46.52
19605.48 4.01 4.08 2.88 3.04 0.70 0.00 1.92 1.17 4.22 8.03 3.75 39.28
19617.71 9.11 4.46 2.35 3.07 0.54 0.75 0.82 0.46 3.27 4.67 5.32 42.53
19622.43 2.29 2.86 2.03 1.82 0.68 0.69 1.96 2.31 4.16 9.34 5.22 35.79
19632.25 4.36 3.43 3.06 0.90 1.68 1.18 0.73 0.59 5.06 9.69 5.79 38.72
19649.76 1.66 2.96 1.56 0.91 3.82 0.99 1.23 2.27 1.00 9.65 5.53 41.34
19655.27 3.88 0.57 3.73 1.63 0.59 0.38 2.18 0.49 2.76 4.98 7.10 33.56
19665.43 2.31 4.38 1.99 1.35 1.15 1.35 0.42 1.77 2.92 6.85 8.31 38.23
19679.32 2.72 3.71 2.50 0.38 2.04 0.01 0.02 0.94 6.66 2.56 4.72 35.58
19686.90 6.08 5.08 1.33 1.67 3.02 0.83 4.58 1.93 4.32 5.86 8.55 50.15
19695.71 3.16 2.20 3.45 2.93 0.91 0.27 0.45 5.57 1.19 2.21 5.68 33.73
19708.22 2.26 3.16 3.31 1.17 0.43 0.48 0.32 2.23 2.52 5.03 8.28 37.41
19715.32 4.36 7.12 2.39 1.43 2.28 0.68 0.57 3.51 3.57 5.31 6.67 43.21
19727.24 8.11 6.74 4.12 0.69 1.81 1.34 1.13 4.10 0.72 3.38 8.98 48.36
19734.29 1.89 1.62 1.35 1.60 2.50 0.08 0.27 1.81 3.31 7.99 8.33 35.04
19747.78 4.01 5.84 2.39 1.37 1.25 1.51 0.01 0.21 1.99 5.06 6.45 37.87
19756.01 5.80 2.87 2.49 1.13 0.84 0.27 4.59 0.00 7.75 5.07 7.66 44.48
19765.55 4.74 2.71 1.67 1.61 0.63 1.17 2.71 1.25 2.06 0.74 1.86 26.70
19771.77 1.58 3.80 0.55 3.70 0.54 0.42 3.59 2.55 2.60 5.27 6.47 32.84
19784.30 3.59 2.43 4.19 1.79 0.75 1.40 1.19 5.95 0.98 6.05 1.37 33.99
19792.25 5.32 1.55 0.81 0.88 0.46 0.73 1.02 2.07 3.38 1.94 11.85 32.26
19804.09 5.04 2.10 3.23 0.97 1.77 0.46 0.64 1.43 1.32 7.16 7.39 35.60
19812.42 4.45 2.23 1.58 1.33 2.31 1.38 0.25 3.42 6.40 4.07 5.56 35.40
19825.35 7.57 3.73 2.07 0.63 1.03 0.59 0.62 1.49 4.07 5.31 6.86 39.32
19837.07 4.57 3.81 1.06 2.10 1.85 2.39 1.90 1.85 1.34 7.97 5.02 40.93
19843.62 3.91 3.91 2.87 3.38 2.81 0.17 0.13 1.01 2.14 8.09 4.95 36.99
19850.58 2.63 2.56 1.30 0.85 2.80 0.10 0.55 1.98 5.74 4.26 1.78 25.13
19868.54 4.41 2.67 1.38 1.71 0.68 1.10 0.10 1.89 4.21 7.98 3.67 38.34
19875.98 2.05 5.53 2.61 2.38 0.16 0.39 0.29 0.91 0.31 3.21 6.11 29.93
19884.07 0.71 3.75 3.20 3.01 1.56 0.50 0.28 1.75 2.24 8.43 3.48 32.98
19892.78 3.43 5.79 2.80 2.78 1.14 0.64 0.89 0.54 2.98 6.13 4.79 34.69
19909.41 3.72 2.58 2.54 1.98 3.05 0.58 0.71 0.05 5.79 10.71 3.63 44.75
19914.46 4.69 4.66 6.53 1.39 1.29 0.28 2.17 0.00 1.31 5.33 3.31 35.42
19927.82 3.09 1.68 4.12 0.12 1.14 0.89 0.66 1.15 2.45 5.57 4.09 32.78
19934.09 0.35 4.80 4.54 2.86 2.48 1.27 0.16 0.03 1.54 2.20 4.48 28.80
19942.51 4.47 3.17 2.27 1.43 1.25 0.28 0.30 1.69 3.51 5.79 8.15 34.82
19954.48 4.97 4.07 2.05 0.81 1.46 1.34 1.81 0.91 3.93 10.40 6.37 42.60
19967.34 8.35 2.06 5.37 2.07 0.59 0.77 1.32 1.85 5.54 5.23 10.18 50.67
19977.02 1.99 8.15 4.32 1.87 1.64 1.20 1.27 3.41 5.83 3.93 2.63 43.26
19987.15 3.31 3.96 0.99 1.98 1.11b0.41 0.35 0.72 3.48 11.62 8.98 44.06
19996.84 6.95 3.66 1.49 2.12 1.86 1.18 0.92 0.17 2.26 9.60 5.06 42.11
20003.77 5.25 2.82 1.48 3.27 1.61 0.23 0.33 1.12 3.00 3.27 2.51 28.66
20012.70 2.07 2.73 3.16 1.39 3.05 1.03 2.32 0.83 3.13 9.26 5.89 37.56
20025.98 4.17 2.82 4.29 1.11 1.73 0.64 0.04 0.42 0.67 3.51 5.98 31.36
20038.39 1.76 6.34 2.74 1.16 0.51 0.06 0.32 0.89 8.96 6.77 3.88 41.78
20046.36 2.44 2.14 0.65 2.51 0.71 0.16 3.00 2.80 2.80 3.16 4.37 31.10
20054.44 1.20 3.71 3.68 3.32 1.63 1.03 0.29 0.75a3.02 5.52 6.85 35.44
200611.65 2.55 2.18 2.73 1.65 1.67 0.06 0.02 1.43 1.55 15.63 7.30 48.42
20076.22 3.38 4.42 0.69 1.46 1.34 1.44 0.73 3.16 3.32 3.71 9.08 38.95
20084.26 1.47 3.65 1.90 0.89 1.64 0.48 2.87 0.78 2.17 6.52 4.10 30.73
20095.40 1.51 4.16 3.36 3.61 0.18 0.06 1.16 1.75 5.54 8.96 2.75 38.44
20106.17 3.52 3.76 3.49 2.83 2.49 0.31 0.64 4.80 5.24 5.05 8.69 46.99
20114.99 3.05 6.29 4.47 3.20 1.42 0.70 0.13 1.29 3.45 5.16 2.24 36.39
20126.83 3.63 7.20 2.68 2.05 2.96 1.04 0.00 0.03 6.71 8.28 6.85 48.26
20134.16 1.58 2.74 5.89 2.38 1.30 0.00 1.35 6.17 1.54 3.79 1.66 32.56
20143.70 6.11 9.44 4.18 3.15 0.73 0.77 1.81 2.23 6.75 4.84 4.79 48.50
20153.66 5.27 4.47 2.03 0.58 0.23 0.09 3.28 0.83 4.81 8.37 11.21 44.83
20167.45 5.97 5.52 1.19 0.94 1.77 0.72 0.17 1.05 10.05 6.48 3.87 45.18
20174.22 8.85 7.32 4.21 2.28 1.52 0.00 0.02 0.59 4.80 8.63 5.43 47.87
20188.12 2.16 2.44 5.69 0.12 0.63 0.05 0.20 1.04 3.78 5.42 6.08 35.73
20193.83 4.62 1.37 3.53 0.62 0.90 1.15 1.20 3.32 3.67 1.71 7.96 33.88
20209.23 4.05 3.17 1.70 3.12 2.28 0.17 0.31 2.48 2.58 5.58 6.65 41.32
20218.75 4.68 2.61 1.03 1.12 1.91 0.00 0.11 3.02 5.76 10.26 4.08c43.33
20227.06 5.32 3.32 2.71 3.82 2.67 0.18 0.05 0.25 2.51 5.49 7.55 40.93
20233.09 2.36 2.56 3.86 0.93 1.22 0.09 0.27 3.44 2.89 5.78 8.48 34.97
20246.52 3.84 2.36 0.91e-----z-----z-----z-----z-----z-----z-----z-----z13.63h
Period of Record Statistics
MEAN5.72 4.07 3.82 2.67 1.77 1.49 0.68 1.00 1.84 3.73 6.09 5.88 38.81
S.D.2.43 1.93 1.72 1.31 0.99 0.86 0.53 1.03 1.40 2.08 2.68 2.19 6.39
SKEW0.30 0.57 1.07 0.51 0.62 0.63 0.70 1.60 1.08 0.82 0.50 0.20 0.09
MAX12.92 9.11 9.44 6.53 4.76 3.90 2.39 4.59 6.17 10.05 15.63 11.85 55.14
MIN0.58 0.35 0.57 0.33 0.12 0.13 0.00 0.00 0.00 0.31 0.74 1.37 23.78
YRS80 80 80 80 79 79 79 79 79 79 79 79 79