SEATTLE TACOMA AIRPORT, WA

Maximum of Precipitation (Inches)

(457473)

File last updated on April 22, 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
19450.68 2.28 0.64 0.83 0.63 0.40 0.11 0.31 0.97 0.71 1.22 1.53 2.28
19461.14 1.12 0.67 0.59 0.24 1.15 0.53 0.17 1.08 0.67 1.34 1.37 1.37
19471.32 1.51 0.61 0.38 0.23 0.45 0.31 0.29 1.10 2.23 0.91 1.13 2.23
19480.74 0.98 2.04 0.70 0.88 0.92 0.44 0.41 1.51 0.66 0.87 0.84 2.04
19490.52 1.83 0.65 0.25 0.81 0.28 0.54 0.25 0.73 1.17 1.38 1.27 1.83
19501.46 0.83 2.08 0.75 0.28 0.22 0.36 1.20 0.99 0.92 1.17 0.88 2.08
19511.13 2.98 0.65 0.54 0.44 0.07 0.25 0.76 0.92 0.93 0.81 0.59 2.98
19521.00 0.74 0.68 0.70 0.24 0.32 0.33 0.38 0.12 0.36 0.37 0.77 1.00
19531.36 0.60 0.98 0.32 0.51 0.60 0.50 0.42 1.65 1.27 0.99 1.19 1.65
19541.64 1.23 0.83 0.52 0.61 0.84 0.75 0.37 0.48 0.70 1.00 1.15 1.64
19550.52 2.58 0.39 0.76 0.53 0.40 0.62 0.08 0.51 1.19 2.18 1.93 2.58
19561.22 0.47 0.61 0.18 0.44 0.50 0.29 0.49 0.58 1.27 0.87 1.78 1.78
19570.59 1.11 1.01 0.44 0.35 0.48 0.74 0.61 0.39 0.80 0.94 0.96 1.11
19581.78 0.70 0.38 0.78 0.56 0.62 0.00 0.11 0.39 1.19 1.22 1.13 1.78
19591.36 0.67 0.57 1.06 0.49 0.53 0.25 0.42 0.81 0.74 3.41 1.60 3.41
19601.23 1.54 0.65 0.52 0.66 0.39 0.00 0.60 0.50 1.24 1.64 1.23 1.64
19610.91 1.55 0.70 0.35 0.80 0.34 0.64 0.56 0.11 0.56 1.17 0.94 1.55
19621.28 0.38 0.76 0.61 0.70 0.21 0.27 0.61 0.77 1.16 1.46 1.00 1.46
19630.76 1.32 0.70 0.63 0.45 0.49 0.41 0.21 0.22 1.29 1.27 0.91 1.32
19641.37 0.45 0.90 0.36 0.22 0.83 0.51 0.52 0.65 0.34 1.50 1.28 1.50
19650.92 1.19 0.18 1.85 0.66 0.44 0.21 0.88 0.23 0.63 1.16 1.27 1.85
19661.23 0.72 0.93 1.04 0.76 0.53 0.50 0.29 0.86 0.83 1.68 1.70 1.70
19672.26 0.83 0.75 0.38 0.12 1.00 0.01 0.02 0.31 1.23 0.56 0.83 2.26
19681.18 1.63 0.79 0.44 0.70 1.75 0.45 1.60 0.56 0.60 1.45 1.85 1.85
19690.71 1.05 0.58 0.58 1.83 0.58 0.20 0.17 1.27 0.49 1.54 0.83 1.83
19701.63 0.94 1.18 0.92 0.69 0.16 0.30 0.24 0.71 0.56 1.08 1.67 1.67
19710.82 0.74 0.94 0.96 0.31 0.86 0.24 0.36 0.66 0.66 1.37 1.61 1.61
19721.66 2.23 2.70 0.79 0.24 0.66 0.64 0.45 1.05 0.36 0.48 1.02 2.70
19731.27 0.54 0.62 0.54 0.46 0.67 0.05 0.14 0.42 1.18 1.48 1.28 1.48
19741.39 1.03 1.20 0.39 0.20 0.46 0.51 0.01 0.16 0.90 0.80 2.14 2.14
19751.30 1.76 0.84 0.67 0.47 0.33 0.12 1.63 0.00 1.24 1.04 1.75 1.76
19761.13 0.78 0.51 0.42 0.40 0.33 0.57 0.95 0.63 0.79 0.20 0.47 1.13
19770.50 0.56 0.68 0.10 0.97 0.50 0.23 1.49 0.63 0.67 1.48 1.55 1.55
19781.01 0.74 0.70 0.68 0.41 0.31 0.73 0.30 1.65 0.78 1.05 0.51 1.65
19790.71 0.72 0.92 0.20 0.33 0.14 0.58 0.26 0.71 0.64 0.60 1.67 1.67
19800.69 0.80 0.36 1.06 0.53 0.37 0.21 0.34 0.38 0.68 1.26 1.22 1.26
19810.40 0.79 0.56 0.31 0.41 0.81 0.85 0.12 1.04 2.72 1.33 0.73 2.72
19821.09 1.40 0.48 0.79 0.13 0.58 0.17 0.33 0.61 1.53 1.06 1.66 1.66
19831.35 0.58 0.70 0.39 0.66 0.88 0.40 0.87 0.59 0.40 1.20 1.02 1.35
19841.36 0.74 0.76 0.64 0.67 1.14 0.15 0.09 0.41 0.82 1.12 0.94 1.36
19850.37 0.66 0.56 0.32 0.29 1.54 0.10 0.24 0.39 1.10 0.89 0.91 1.54
19862.98 1.16 0.63 0.60 0.34 0.32 0.40 0.05 0.59 2.13 2.49 0.75 2.98
19871.93 0.44 1.47 0.87 1.06 0.09 0.21 0.16 0.46 0.23 0.68 1.36 1.93
19881.61 0.24 0.96 0.70 0.64 0.42 0.22 0.14 0.66 0.68 1.08 0.85 1.61
19890.49 0.81 0.67 0.68 0.72 0.33 0.41 0.70 0.22 0.57 1.28 1.41 1.41
19902.83 0.56 0.45 0.48 0.96 1.08 0.39 0.27 0.03 1.04 2.95 0.82 2.95
19910.94 1.58 1.04 2.64 0.42 0.55 0.28 0.66 0.00 0.57 0.82 1.22 2.64
19921.50 0.68 0.56 0.95 0.04 0.64 0.57 0.53 0.65 0.52 0.91 1.27 1.50
19930.93 0.26 1.81 0.83 0.51 0.72 0.45 0.06 0.03 0.53 0.79 0.68 1.81
19940.54 0.74 0.46 0.58 0.22 0.45 0.12 0.12 0.60 1.05 1.34 1.65 1.65
19950.89 1.60 0.58 0.59 0.21 0.34 0.81 0.93 0.27 1.02 1.93 0.98 1.93
19961.68 3.06 0.41 1.71 0.71 0.53 0.27 0.76 0.36 0.99 1.30 1.92 3.06
19971.51 0.49 1.86 1.42 0.33 0.45 0.80 0.51 0.77 1.01 0.79 1.32 1.86
19980.95 0.68 0.79 0.50 0.65 0.50b0.11 0.20 0.46 0.70 3.04 1.53 3.04b
19990.92 1.04 0.67 0.21 0.65 1.00 0.64 0.25 0.08 0.64 1.52 1.40 1.52
20000.46 1.34 0.46 0.35 0.74 0.56 0.11 0.28 0.30 0.79 1.12 0.75 1.34
20010.76 0.44 0.58 0.78 0.56 1.16 0.65 1.41 0.36 0.44 2.61 1.63 2.61
20021.21 0.95 1.01 1.45 0.21 0.79 0.58 0.02 0.15 0.49 0.62 1.31 1.45
20030.95 0.71 0.99 0.70 0.37 0.22 0.04 0.14 0.22 5.02 2.06 0.46 5.02
20041.63 0.50 0.46 0.18 0.71 0.16 0.12 1.00 0.64 1.07 0.89 0.82 1.63
20052.39 0.75 1.51 0.59 0.72 0.54 0.40 0.21 0.41a0.73 0.99 0.93 2.39a
20061.33 0.47 0.49 0.58 0.24 0.75 0.03 0.01 0.39 0.55 3.29 1.55 3.29
20071.77 0.74 0.91 0.10 0.56 0.38 0.45 0.25 1.19 0.80 1.09 3.77 3.77
20080.62 0.34 0.64 0.34 0.19 0.58 0.25 0.88 0.54 0.57 2.15 0.73 2.15
20092.29 0.34 0.69 0.92 0.89 0.09 0.04 0.36 0.93 1.24 1.34 0.55 2.29
20101.07 0.44 0.92 0.87 0.45 0.37 0.18 0.39 1.49 1.21 1.56 2.19 2.19
20110.82 0.54 1.47 1.13 0.97 0.41 0.35 0.12 0.59 0.89 1.76 0.90 1.76
20121.09 0.68 1.08 0.43 0.73 0.65 0.60 0.00 0.01 1.36 2.13 0.89 2.13
20131.51 0.37 0.47 1.54 0.54 0.39 0.00 0.76 1.71 0.36 1.18 0.42 1.71
20140.85 1.04 1.84 0.73 1.31 0.25 0.76 0.85 0.80 1.26 1.35 0.81 1.84
20151.03 1.03 2.20 0.55 0.24 0.18 0.08 1.28 0.23 1.30 1.86 2.13 2.20
20161.15 0.82 0.93 0.32 0.50 0.55 0.33 0.13 0.42 1.75 1.31 0.81 1.75
20171.74 1.63 0.81 0.85 0.47 1.05 0.00 0.02 0.16 1.61 1.14 1.50 1.74
20181.12 0.57 0.46 1.70 0.04 0.25 0.04 0.11 0.42 0.84 1.84 0.73 1.84
20190.85 1.22 0.49 0.65 0.19 0.41 0.43 0.38 0.65 0.96 0.39 3.25 3.25
20201.19 1.18 0.58 0.59 1.14 0.56 0.13 0.11 1.08 0.61 0.90 1.64 1.64
20212.33 0.88 0.55 0.51 0.43 0.81 0.00 0.05 0.81 1.99 1.26 0.48c2.33c
20222.00 2.97 0.59 0.55 0.65 1.10 0.09 0.03 0.15 0.64 1.20 1.52 2.97
20230.46 0.40 0.41 0.67 0.70 0.42 0.09 0.12 0.82 0.60 1.14 2.39 2.39
20240.74 0.95 0.54 0.20i-----z-----z-----z-----z-----z-----z-----z-----z-----z
Period of Record Statistics
MEAN1.20 1.00 0.84 0.69 0.54 0.56 0.34 0.43 0.60 0.97 1.32 1.26 2.02
S.D.0.54 0.62 0.47 0.42 0.30 0.32 0.24 0.39 0.40 0.65 0.63 0.58 0.68
SKEW0.99 1.62 1.88 1.91 1.24 1.20 0.36 1.35 0.83 3.57 1.35 1.56 1.59
MAX2.98 3.06 2.70 2.64 1.83 1.75 0.85 1.63 1.71 5.02 3.41 3.77 5.02
MIN0.37 0.24 0.18 0.10 0.04 0.07 0.00 0.00 0.00 0.23 0.20 0.42 1.00
YRS80 80 80 79 79 79 79 79 79 79 79 79 79