HEADWORKS PORTLAND WTR B, OR

Total of Precipitation (Inches)

(353770)

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
1899-----z-----z-----z8.71r8.38 2.69 0.28 6.05 2.77 8.08 12.35 8.70 49.30d
19008.89 8.21 9.11 3.96 7.67 3.83 1.71 2.32 4.89 10.69 10.39 9.22m71.67a
190111.77 12.23m10.04 5.75 4.35 5.17 0.53 0.12 -----z2.23 9.18 8.60 57.74b
19025.56p10.04 12.22g9.49 7.06o2.25u4.91 1.18 3.12 1.69 17.38 14.13 61.94d
190312.22l2.88 4.87 5.80a5.15 4.33 1.93 2.04 4.95 5.55 12.67j6.97r37.50c
190412.37 12.75a15.45a5.86 1.39 1.90 1.19 0.42 0.68 3.70 8.06 12.18 75.95
19055.89 3.53 7.25l3.20r7.87 3.07 0.30 0.65 5.11 9.58 5.08 9.56 50.64b
19068.07 9.05 4.22 3.60 4.56 6.29 0.05 0.79 5.80 9.51 14.79 12.19 78.92
190712.52 8.06o7.19 7.83 3.42 5.17 1.27 3.27 3.27 1.99 11.92 14.93 72.78a
19086.63 4.86 11.20 4.12 8.01 4.43 0.28 2.42 0.37 9.50 4.60 7.61 64.03
190912.43 9.71 5.54 4.52 5.55 0.67 4.93 1.05 3.41 5.49 21.60 6.64 81.54
191012.03 12.43 7.27 5.03 5.01 2.59 0.00 0.09 -----z6.29 12.78 8.00 71.52a
191110.81 5.36 2.71 3.17 8.28l2.33 0.40a0.53 7.60 4.73 9.05b11.60 58.29a
191215.30 10.31 3.97 4.88 5.89 5.68 0.92 6.59 1.97 6.08 9.49 10.71a81.79
19138.44a4.83 11.60a5.33 3.91 6.83 1.45 1.55 5.33 7.57 9.87 5.81 72.52
191413.97 8.02 5.93 7.66 2.74 5.39 2.35 0.00 8.67 5.37a6.97 3.20 70.27
19159.15 6.86a4.89 3.95 8.29 5.48 4.10 0.06 2.72 6.31 16.51 14.46 82.78
19168.61a11.55 16.44 7.80 6.74 4.67 5.39 0.60 2.93 2.26 10.99 9.61 87.59
19178.32 5.29 10.75 10.13 5.27a4.17 0.18 0.00 5.40 0.57 6.61 24.97 81.66
191812.93 10.48 5.81 3.66 4.73 0.20 1.83 1.30 0.69 7.76 7.88 6.86 64.13
191912.38 11.72 9.43 8.80 4.57 1.82 0.48 0.07 5.57 6.28 16.45 13.15 90.72
19207.92 0.51 8.85 12.38 2.11 4.57 2.36 2.28 8.35 8.27 7.84 13.41 78.85
192114.24 14.49 9.97 7.45 3.10 4.12 0.43 1.17 4.97 5.67r21.28e5.06 86.28a
19225.92 6.19 10.89 7.56 3.18 0.48 0.00 2.83 2.32 6.58 5.76 13.38 65.09
192318.19 4.61 5.93 4.12 6.32 3.92 3.36 1.63 1.79 4.00 9.00 11.67 74.54
19246.36 8.83 5.39 3.70 1.15 3.13 0.23 1.58 4.58 6.80 12.86 9.18 63.79
192516.40 10.57 5.49 7.97n4.44 2.46 0.00 1.63 2.26 1.49 8.88 8.50 62.12a
19267.63 13.14 2.65 3.30 5.76 2.02 0.00 3.97 5.48 8.29 10.52 9.40 72.16
192710.57 10.07 7.01 4.91 6.27 2.73 0.45 0.58 12.21 6.40 17.60 6.88 85.68
19288.52 3.06 13.74 7.65 2.26 3.64 1.42 0.18 0.69 5.44 7.91 11.27 65.78
19298.62a2.98 7.50 7.79 3.78 3.74 0.09 0.38 1.56 2.64 1.35 15.24 55.67
19304.62b10.43 4.56 4.64 7.33 3.21 0.00 0.08 3.02 8.40 5.92 6.04 58.25
19317.01 4.31 16.11 4.31 3.22 6.78 0.14 0.10 3.03 7.39 10.61 10.28 73.29
193213.92 6.12 14.97 6.01 5.43 0.77 1.83 1.34 0.89 13.66 19.28 13.13 97.35
193321.46 15.03 12.09 3.04 9.75 4.02 0.30 4.38 14.96 11.27 8.58 32.94 137.82
193413.48 2.39 10.27 5.51 4.04 2.00 0.64 1.67 2.64 8.11 18.46 16.75 85.96
19357.90 5.82 11.00 7.12 2.56 5.23 0.77 0.32 2.10 5.63 4.70 7.61 60.76
193616.74 8.51 10.86 2.59 7.78a4.89 2.73 0.36 3.42 1.60 0.77 13.14 73.39
193710.84 11.25 5.72 12.52 3.70 9.59 0.32 2.83 2.60 6.81 21.24 18.22 105.64
193810.58 8.15 13.04 7.47 3.68 2.54 0.56 0.77 1.74 6.39 10.85a9.00 74.77
19399.64 12.22 7.29 1.69 3.47 5.87 1.82 1.81 1.09 6.51 3.36 12.20 66.97
19403.73 16.68 10.38 6.87 2.59 0.44 1.15 0.27 6.03 8.05 11.52 8.00 75.71
19418.27 2.91 3.21 3.94 9.97 4.71 0.01 3.14 8.97 5.60 10.96 13.54 75.23
19425.20 13.01 5.97 6.17 9.37 7.12 2.18 0.40 0.25 8.77 30.77 21.09 110.30
194314.34 9.92 11.49 7.33 4.22 8.26 0.48a2.77 0.58 10.36 4.71 5.35 79.81
19445.72 8.35 6.58 7.10 3.73 2.84 0.32 0.65 6.59 2.29 8.13 4.12 56.42
194511.60 10.73 12.49 10.76 9.91 0.75 0.67 1.31 6.75 4.73 19.65 12.38 101.73
194613.58 9.62 9.10 4.41 3.99 5.43 2.13 0.77 2.59 11.95 12.02 13.29 88.88
194710.66 3.33 7.81 5.08 2.02 9.11a1.46 1.49 2.99a17.75 13.55 9.88 85.13
194812.03 12.50 9.03 7.26 7.92 3.85 3.22 2.10 5.06 5.74 16.86 19.22 104.79
19493.76 19.89 5.67 2.25 5.06 2.35 1.63 0.93 4.00 7.70 9.70 12.97a75.91
195015.84 12.70 12.44 6.65 3.64 5.46 1.46 1.44 3.80 14.06 17.67 14.45 109.61
195121.13 7.57 11.67 2.96 4.78 0.46 1.21 0.75 4.38 12.54 9.33 9.25a86.03
19528.20 7.33 9.89 2.86 2.40a6.14 0.05 0.07 1.15 1.52 1.49 12.02a53.12
195323.34 9.04 9.29 4.89 9.79 5.40 0.22 3.47 2.66 3.43 14.45 16.07 102.05
195417.02 5.87 4.41a5.71b5.38a8.80 3.25a3.14 1.89 5.47b9.24 9.69 79.87
19555.96 5.30a9.19 11.00 3.90 3.40 2.38 0.00 4.97 12.73 16.75 16.70 92.28
195617.27 8.64 10.88 1.40 5.66 5.59 0.13 5.21 2.44 12.67 4.00 8.98 82.87
19576.15a6.98 14.85 5.52 4.50 3.71 0.50 0.87 1.05 6.36 7.19 16.28 73.96
195813.88 9.69 4.57 10.58 1.73 7.12 0.00 0.65 4.52 4.19 16.35 12.48 85.76
195915.56 8.57 10.96 4.73 6.67 4.26 1.05 0.73 9.36 9.74 5.34 6.14 83.11
19607.44 8.23 11.35 7.90 9.66 2.41 0.02 3.14 2.73 7.84 17.87 6.67 85.26
19616.64 19.60 12.19 6.95 7.15 1.09 0.67 0.92 4.64 8.77 8.92 11.46 89.00
19625.15 6.69 12.17 8.35 9.37a1.44 0.60 2.31 3.31 6.57 15.14 5.03 76.13
19634.52 8.83 9.73 8.52 6.46 4.87 3.07 1.97 3.82 5.37 11.55 8.24 76.95
196418.08 4.95 7.92 6.57 4.21 6.80 2.08 3.45 3.08 3.24 11.66 17.89 89.93
196517.50 7.66 2.54 5.50 2.92 1.23 0.77 3.98 0.85 4.65 7.86 11.56a67.02
196613.40 5.59 10.14 4.37 2.30 2.42 3.75 0.77 2.85 7.36 11.65 11.79 76.39
196715.51 6.75 7.89 4.57 2.88 2.54 0.00 0.03 2.10 11.63 5.77 12.26 71.93
19687.23 12.03 5.53 5.95 5.13 5.36 1.25 7.15 4.04 11.02 14.98 16.98a96.65
196915.15 4.60 5.10 4.02 4.22 7.04 0.76 0.98 5.50 6.89 5.85 12.34 72.45
197019.54 5.68 6.24 10.25 2.96 2.14 0.57 0.02 6.37 6.54 11.89 12.21 84.41
197117.60 8.83 10.47 6.85 3.74 5.02 0.71 2.64 6.90 8.38 12.79 15.85 99.78
197214.41 10.24 11.53 11.17 5.28 2.58 0.97 0.23 6.88 2.27 8.50 15.45 89.51
19738.08 3.36 7.08 4.38 3.60 4.31 0.05 2.05 7.72 7.79 18.26 17.67 84.35
197415.19 11.29 11.99 7.93 6.62 2.11 3.80 1.31 0.45 2.87 10.60 14.07 88.23
197514.67 8.32 9.43 5.47 4.58 3.59 0.56 4.97 0.00 11.49 10.89 15.10 89.07
197612.54 10.43 7.22 7.27 4.74 2.02 1.78 4.55 1.80 3.30 2.13 4.12 61.90
19773.21 4.93 12.33 2.72 9.98 1.90 0.95 4.55 7.50 4.59 11.55 17.82 82.03
19788.54 5.45 2.97 8.50 5.93 3.91 2.78 5.55 4.75 0.91 7.64 8.76 65.69
19794.48 15.12 6.83 8.57 3.83 2.93 1.61 2.11 2.82 9.16 6.37 10.42 74.25
198014.23a7.73 9.74 5.77 4.43 6.33 0.54 1.54 3.97 2.50 11.85 14.99 83.62
19813.23 8.23 5.44 6.66 6.48 9.13 0.92 0.13 5.41 6.20 6.15 15.89 73.87
198214.28 14.34 6.22 5.66 1.95 2.33 1.33 2.68 7.66 8.30 7.96 12.63 85.34
198312.53 13.61 11.62 4.59 5.58 6.76 6.56 2.45 2.25 4.17 12.65 10.29 93.06
19848.16 8.03 9.78 7.71 8.71 9.24 0.00 0.38 4.99 9.47 15.86 8.76 91.09
19850.39 7.94 6.86 4.55 3.86 4.13 0.58 2.64 6.39 7.36 11.91 2.86 59.47
19869.42 13.05 5.43 6.04 4.29 1.57 3.17 0.75 6.96 2.71 12.92 4.19 70.50
19879.62 5.81a9.07 5.54 4.24 0.81 1.65 0.88 -----z0.31 6.01 14.10 58.04a
198811.00 6.73 10.01 10.71 5.76 3.33 1.98 0.28 2.75 1.03 16.90 6.87 77.35
198912.16 6.17 12.75 6.28 4.63 1.97 1.24 2.18 2.83 4.54 8.22 6.72 69.69
199014.68 10.15 4.68 8.72 5.47 5.50 1.41 1.99 1.36 13.30 10.38 8.27 85.91
19917.56 9.30 7.82 8.83 8.72 4.28 0.74a1.63 0.99 3.64 16.27 9.68 79.46
19926.74 7.71 2.31 9.46 0.57 1.89 3.31 1.22 5.73 6.53 11.33 9.88 66.68
19935.94 0.79 10.74 13.18 8.83 5.89 3.65 1.19 0.02 2.89 4.59 8.48 66.19
199410.26 10.19 7.02 6.47 2.53 4.88 0.56 0.23 1.95 13.91 14.49 10.42 82.91
199512.22 8.78 6.06 7.02 4.74 6.12 1.72 3.44 6.46 8.81 19.34 12.69 97.40
199615.24 15.99 5.59 9.10 7.88 1.91 0.45 0.66 4.73 12.21 15.55 22.83 112.14
199711.47 6.04 14.39 9.42 5.01 -----z2.10 1.62 6.15 9.69 5.02 6.61 77.52a
199813.20 7.54 7.38 5.30 10.81 4.36 0.38 0.12 3.62 5.60 12.87 16.37a87.55
199910.39 13.29 7.40 3.76 6.99 4.36 1.27 1.26 0.18 5.42 13.35 11.17 78.84
200011.09 10.48 5.46 3.51 8.29 3.12 0.19 0.44 4.04 7.62 4.63 5.94 64.81
20013.96 4.26 7.49 7.89 3.60 5.69 1.74 1.47 1.51 8.80 10.98 13.97 71.36
200213.36 5.12 8.15 5.38 3.10 3.80 0.41 0.13 2.70 1.70 4.34 12.36 60.55
200313.54 6.16 12.33 9.87 3.73 1.49 0.03 0.10 4.83 4.95 8.79 15.49 81.31
200413.51 7.87 4.79 3.13 6.41 3.24 0.13 5.93 4.19 7.82 4.75 8.98 70.75
20054.88 2.27 7.23 7.83 8.16a5.43 1.24 0.86 2.36 8.08 10.67 13.66 72.67
200617.33 6.96a6.33 6.34 5.14 2.41 0.28 0.43a3.06 4.61 22.25 11.70 86.84
20078.72 9.59 8.99 4.74a1.94a2.59 0.93 1.56 4.40 8.11 8.85 15.93 76.35
200812.27 6.52 9.76 7.46 6.04 3.48 0.19 3.63 2.20a3.76 11.12 11.39 77.82
200910.54 3.68 12.14 6.72 6.20 1.69 0.79 0.60a2.38 7.82 11.49 8.06 72.11
20108.82a4.85a8.99 6.63 9.46 8.22 0.81 1.12 4.66 6.46 15.91 14.02 89.95
20119.43 8.83 12.75 11.62 8.01 3.12 2.13 0.24 2.10 5.61 9.15b7.46 80.45
201212.90 9.68 15.21 7.97 5.11 8.85 0.52 0.05 0.12a12.97 12.75 13.56 99.69
201312.66 5.58 4.94 7.59 7.83 2.65 0.00 0.51 10.67 4.10 7.90 8.33 72.76
20147.90 11.16 13.49 8.70 5.29 4.78a1.10 0.47 1.83 10.33 9.39 11.13 85.57
20155.96 7.25 8.07 5.73 2.79 0.95 0.44 1.53 1.75 7.24 10.31 21.81 73.83
201611.18 9.21 10.18 4.64 4.26 4.65 2.21 0.57 4.33 16.13 9.03 9.89 86.28
20175.02 14.60 15.12 8.49 4.73 3.26 0.00 0.36 5.43 9.54 12.60 7.11 86.26
20189.95 6.99 5.02 9.24 0.71 1.99 0.07 1.13 1.98 7.27 7.37 11.07 62.79
20196.36 10.07 3.29 9.40 2.98 2.52 0.90 1.26 6.72 4.85 2.89 6.87 58.11
202014.88 7.35 6.50 3.97 8.95 6.62 0.51 0.84 2.17 4.65 10.06 10.71 77.21
20219.87 9.59 4.14 1.75 4.06 2.66 0.01 0.49 5.30 7.38 12.89 13.15 71.29
20229.90 5.75 7.79 10.94 9.73 8.91 0.47 0.15 0.91 6.57 11.85 10.74 83.71
20236.61 6.34 8.25 10.34 1.23 2.08 0.18 0.79 2.88 5.83 9.89 14.96 69.38
202417.68 8.39a6.08 2.05e-----z-----z-----z-----z-----z-----z-----z-----z34.20h
Period of Record Statistics
MEAN10.85 8.40 8.56 6.46 5.24 4.00 1.21 1.57 3.85 6.81 10.92 11.59 79.86
S.D.4.37 3.62 3.32 2.55 2.39 2.20 1.27 1.55 2.60 3.44 5.00 4.58 13.52
SKEW0.26 0.53 0.26 0.34 0.40 0.58 1.64 1.48 1.16 0.50 0.66 1.08 0.88
MAX23.34 19.89 16.44 13.18 10.81 9.59 6.56 7.15 14.96 17.75 30.77 32.94 137.82
MIN0.39 0.51 2.31 1.40 0.57 0.20 0.00 0.00 0.00 0.31 0.77 2.86 53.12
YRS123 123 123 123 123 123 125 125 122 124 124 123 112