HEADWORKS PORTLAND WTR B, OR

Average of Minimum Temperature (Degrees Fahrenheit)

(353770)

File last updated on March 28, 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-----z39.23d43.10 47.67 53.55 51.77a49.77 42.52 44.93b36.96d45.50c
190037.66b36.12c41.20a41.07a48.23a53.83a54.84 52.03 49.63 43.04c39.41c37.92e44.58
190133.26 33.81b36.27e37.80 46.07a48.47 49.90 53.32 -----z48.03a40.52c36.32c42.16a
190232.00c37.54 37.42 -----z-----z50.80 54.29 51.84 47.07b44.45 38.25b34.67d42.83b
190335.36c28.54b-----z-----z-----z51.63 53.87 55.39 45.67 -----z-----z31.77a43.17e
1904-----z-----z-----z-----z-----z-----z-----z-----z-----z-----z-----z34.19e34.19k
1905-----z-----z-----z40.47 -----z-----z-----z-----z-----z-----z-----z-----z40.47k
1906-----z-----z-----z-----z44.61 45.93 55.48 50.61 48.57 43.48 38.20 36.13 45.38d
190727.06 35.14g34.45 37.07 44.19 48.40 51.52 49.87 48.57 44.90 38.50 35.90a41.86a
190834.10 32.52 35.45 38.30 40.71 46.40 53.00 50.19 43.50 42.65 38.30 31.97 40.59
190925.45 34.71 34.16 36.30 40.77 46.83 49.16 46.55 47.77 42.32 38.27 28.06 39.20
191029.77 30.71 38.00 39.60 44.94 45.66a50.52 57.23 50.27 48.90b39.04b37.84 42.70
191133.40a34.37a36.97b42.45a45.67a48.00b55.13a50.19 40.97 40.71 36.17 34.35 41.53
191232.24b37.00 32.23 36.57 43.29 48.30 51.35 51.23a51.07 41.44d37.40 33.77a41.32
191329.57a29.39 33.77 36.40 -----z48.50 52.06 46.61 43.52a39.19 36.63 31.74 38.85a
191434.48 34.32 37.81 40.03 42.83b46.11b50.65 53.84 45.47 44.81 37.37 27.68 41.28
191530.48 34.79 38.39 38.45a43.61 47.18b52.68 52.13 46.89b42.60a37.52a34.63a41.61
191625.79c31.54a34.65 37.33 37.03 44.82b49.32 50.73a47.07 37.17a35.00 31.42 38.49
191730.71c32.14 32.26 36.97a41.61 44.80 49.81 -----z49.23 41.06 39.93 39.93a39.86a
191837.39 32.18 34.26 36.13 40.71 48.80 49.19 50.84 47.87 44.84 37.73 33.58 41.13
191932.71 34.54 35.48 37.67 42.16 44.33 49.70a50.35 46.60 38.19 36.67 28.68c39.76
192033.71 29.90 35.68 35.53 39.00 46.37 51.32 52.42 48.10 42.29 35.53 36.84 40.56
192132.68 34.50 36.00 38.28a40.94 63.70 46.48 49.32 44.17 41.77a39.79a31.54c41.60
192227.90a28.43 31.97b34.60 41.34b46.67 50.42 51.52b48.20 43.69b33.52a29.23a38.96
192333.86b31.21 32.48 38.87 44.42 48.10 52.71 52.71 49.00 43.68 40.43 33.68 41.76
192430.97a38.38 35.06 37.17 43.94 46.93 48.94 50.70a46.68b44.26 37.62a26.97 40.63
192536.00 37.43 35.90 41.20 44.84 49.00a50.62b50.26 48.90 41.34b37.14a37.41b42.50
192633.90b38.27b38.35 43.03 44.35 48.50 50.06 54.27a49.43 49.65 43.42d36.42g44.84a
192734.32 32.54 32.32 35.53 42.36c50.13 49.55 50.58 47.63 43.68 40.80 30.87 40.86
192831.74 32.41 39.10 38.23 43.26 49.07 51.45 49.06 50.10a45.66b39.23 32.60a41.83
192927.87 27.54 35.74 36.55a42.45 47.87 48.35 49.13a45.70 43.58 33.83 36.90a39.63
193021.68 35.71 36.13 42.13 42.27a46.70 48.29 51.68 49.63 41.94 36.70 33.77 40.55
193135.67a34.48a37.10 39.07 46.03 49.33 50.29 49.97 47.07a42.67a35.38a32.58 41.64
193231.61 29.62 37.58 38.73 42.90 49.27 48.77 52.03 45.60 44.58 40.00 29.29 40.83
193331.68 28.18 34.71 36.10 41.39 46.43 49.94 51.26 44.97 43.13 36.00 38.48 40.19
193437.77 37.89 40.58 43.80 45.86b47.97 50.74 52.71 47.07 45.00 42.03 36.35 43.98
193530.10 34.64 33.50a37.13 41.74 48.27 51.00 49.71 48.07 41.32 31.97 34.32 40.15
193634.63a25.41 33.16 40.73 46.63a50.77 52.29 51.13 45.72a43.68 34.57 35.81 41.21
193722.48 30.75 35.29 37.90 43.06 50.17 53.03 50.74 48.87 45.74 41.00 36.03 41.26
193832.77 33.39 35.19 38.90 42.97 47.90 52.32 48.81 49.53 43.94 34.00a34.10 41.15
193935.71 32.04 34.13 38.93 44.23 46.27 51.97 49.94 47.20 44.19 38.93 38.94 41.87
194033.20a37.79 38.35 41.60 44.74 47.37 51.65 51.58 51.53 46.97 36.73 35.32 43.07
194134.61 36.64 38.74 41.30 45.23 49.37 55.10 52.52 48.90 44.26 38.97 34.87 43.37
194229.29 33.25 33.65 39.93 43.13 46.37 55.03 53.52 47.87 43.71 37.60 34.81 41.51
194327.55 32.21 35.03 40.93 41.77 47.10 51.77a50.19 47.90 44.77 37.57 32.61 40.78
194430.90 33.28 33.06 39.73 43.16 47.90 51.61 50.03 48.10 45.68 37.00 33.35 41.15
194534.42 34.59a34.61 37.87 44.65 45.87 49.87 50.13 45.77 41.32 37.83 34.13 40.92
194634.10 34.36 35.74 38.17 45.32 48.10 51.32 50.23 46.70 39.71 33.50 35.06 41.03
194729.29 35.11 37.68 40.07 45.32 48.00a51.16 48.81 47.93a44.97 38.20 34.74 41.77
194831.65 31.17 33.61 37.13 43.10 51.97 48.87 51.35 44.62a39.35 34.27 29.29 39.70
194921.07a28.79 33.67a37.27 43.23 45.31a49.07a50.19 48.00a37.20a40.00 31.77a38.80
195020.77 28.93 33.23 35.17 37.32 44.73 50.17a51.35 46.03 43.23 35.70 38.29 38.74
195130.79c31.96 30.03a36.03 41.67a45.87 48.43a46.52b45.43 40.63a35.00a29.55 38.49
195230.27a32.32a34.26 37.48a42.74 47.67 50.13 50.77 47.59a44.26 33.03 33.57a40.34
195339.40a34.82 34.67a38.03 42.39 46.03 49.42 51.81 48.40 43.39 40.40 35.71 42.04
195430.87a33.04 30.68 36.10 42.20a45.31a48.90a50.53a47.83 40.97a40.45a33.29 40.01
195530.71 32.64 32.29 35.10 40.00 47.27 50.03 48.87a46.63 43.67a32.79a32.13a39.34
195632.53a28.38 32.32 37.40 44.07a45.97a50.26 50.68 46.67 40.55 34.33 33.39 39.71
195724.42 30.36 35.32 38.77 45.55 47.47 48.48 47.33a47.70 42.19 34.27 34.77 39.72
195836.48 40.33a34.58 40.00 47.58 54.17 54.45 52.45 49.53 45.19 39.72a39.45 44.50
195934.87 33.39 36.06 38.80 42.52 49.70 52.03 49.68 47.77 43.35 37.33 36.26 41.81
196031.61 36.21a36.19 40.90 43.81 47.60 51.16 50.90 47.50 43.84 38.59a35.81 42.01
196138.77 38.39 38.42 38.40 44.97 50.23 52.74 53.65 45.86a41.61 33.50 34.58 42.59
196232.13 35.21 34.48 41.30 42.71 46.10 49.71 50.94 48.10 43.39 39.13 36.84 41.67
196328.35 41.19a36.48 38.90 43.68 49.03 51.90 53.19 53.83a47.26 40.57 36.65 43.42
196436.26 33.41 36.23 37.30 41.55 47.63 51.45 52.35 49.30 47.80a37.10 32.45 41.90
196536.10 35.25 35.03 40.07 41.65 47.23 52.90 55.00 47.70 47.71 42.80 33.40a42.90
196634.10 34.86 35.87 40.60 42.55 47.97 51.39 53.52 51.13 44.23 41.17 38.35 42.98
196737.06 35.96 35.19 36.97 44.52 51.10 52.81 56.68 53.33 46.68 41.70 33.19 43.77
196833.70a40.17 39.90 38.23 45.55 48.73 53.32 53.77 51.20 43.23 39.20 31.26 43.19
196928.73a33.61 35.26 39.90 45.42 52.30 51.10 50.97 51.83 44.55 40.17 36.71 42.55
197035.13 39.25 37.26 36.90a42.00 50.57 51.52 51.94 47.73 43.55 39.27 34.13 42.44
197133.16 35.61 34.16 37.83 44.23 46.47 52.29 53.35 47.07 42.06 37.47 33.19 41.41
197231.06 35.41 38.58 36.20 43.35 48.10 51.39 51.84 46.43 40.68 39.50 30.26 41.07
197333.23a37.71 37.42 40.10 45.39 49.27 52.74 50.52 51.21a43.81 35.77 39.29 43.04
197431.16 35.21 36.68 40.37 42.42 47.93 51.84 53.16 51.00 42.74 38.87 36.10 42.29
197533.74 33.07 36.23 36.00 43.23 47.87 52.84 50.87 50.77 46.40a38.03 38.16 42.27
197635.35 34.17 34.61 39.57 44.23 46.87 50.52 52.47a50.93 43.97 41.23 35.17a42.42
197731.48 38.46 35.52 39.80 41.81 49.40 51.19 55.84 49.30 44.77a37.10 37.16 42.65
197836.33d37.32 38.55 39.17 42.39 50.47 53.10 54.13 51.13 45.71 33.27 30.61 42.68
197927.13 33.25 38.23 40.40 44.32 48.20 52.23 52.94 52.57 47.10a39.70 39.06 42.93
198029.81 37.14 37.13 41.27 44.81 47.63 52.87 51.32 50.67 47.32 41.73 37.03b43.23
198140.13a35.82 38.97 41.10 45.74 48.80 52.10 54.52 49.30 42.84 40.07 37.03 43.87
198233.03 34.68 35.23a36.13 42.29 50.20 51.71 53.61 50.83a45.97b37.67 36.23a42.30
198338.90a40.56a41.35 39.48a46.16 49.13 52.65 53.73a48.93 44.39 41.93 31.03b44.02
198435.17a37.52 40.50a39.79a43.33a47.73 51.19 52.26 50.03a43.65 39.23 32.74 42.76
198532.63a31.50 34.00 40.66a43.60a48.43 54.29 51.65 48.00 43.71 31.27 28.87a40.72
198638.29 35.79 41.42 39.20 44.87 51.37 51.42 54.52 49.33 46.40a40.90 36.23a44.14
198734.03 38.41a39.39 42.23 46.35 49.37 52.71 52.23 -----z44.97 41.40 32.84 43.08a
198832.45 35.14 35.37a40.73 43.26 47.57 49.90 50.77 48.93 48.13 40.46b35.10 42.32
198934.26 28.07 37.35 42.37 44.74 50.30 52.03 53.58 49.90 44.19 41.80 34.77 42.78
199036.29 32.89 38.06 42.93 44.55 50.67 54.06 55.13 52.07 43.61 40.70 27.61 43.22
199132.52 40.46 36.00 39.73 43.39 47.50 53.60a54.29 50.10 44.16 41.40 38.16 43.44
199237.90 41.00 40.13 44.23 47.52 51.60 55.16 53.45 49.63 46.93a40.28a33.81 45.14
199330.83a33.18 38.74 42.63 48.07b49.60 52.26 53.97 49.00 47.04c33.33 34.84 42.79
199437.13 33.68 37.87 42.28a47.13 48.00 53.00 53.55 52.13 43.94 34.90 35.45 43.25
199538.37a36.89 38.03 39.80 46.10a49.40 55.29 51.87 53.90 45.48 44.33 37.81 44.77
199635.19 34.72 37.00 42.63 43.94 48.47 54.35 53.48 48.43 44.83a38.76a35.40a43.10
199735.52 35.75 37.87 41.21a48.66b-----z53.52b54.73a52.82b44.17b43.07a35.35 43.88a
199837.63a38.19a38.84 40.70 46.68 51.17 57.13 54.74 49.72a44.39 41.36b32.37a44.41
199936.45 36.46 36.10 38.37 41.77 49.38a52.65 55.77 49.27 43.97 42.40 37.39 43.33
200034.23 37.45 35.74 41.70 45.20a49.13 53.16 51.87 51.60 46.29 36.55a36.42 43.28
200136.63a34.14 38.52 38.63 44.48 48.23 52.19 54.65 50.97 44.42 42.13 36.61 43.47
200235.71 35.64 35.53a40.00 43.35 50.40 54.16 52.65 49.40 44.32 41.47 38.45 43.42
200340.65 37.11 40.43a39.59a44.55 51.10 53.57a54.29 51.97 48.77 38.07a36.81 44.74
200433.80a38.45 40.00a42.60 47.71 50.77 55.19 56.42 51.50 42.48 39.76a38.13 44.73
200536.29 35.07 39.06 41.80 49.17a49.70 54.10 53.58 47.87 47.81 38.80 34.55 43.98
200639.00 34.33a36.50a40.28a45.71 52.21a54.84 52.30a50.40 43.10a39.73 35.42 43.65
200731.97a37.14 39.84 40.97a44.48 50.15c55.13a54.29 49.17 43.87 35.50b33.21c42.98
200832.39 35.34 35.74 37.10 45.03 47.00 52.83a55.65 50.77d44.10 42.61b30.21c42.40
200932.87 34.11 35.06 38.27 44.13 51.83 55.94 55.07a52.70 44.35 39.17 31.77 42.94
201039.60a38.12b38.06 39.90 42.42 48.63 51.90 52.97 52.47 46.42 38.40 36.68 43.80
201135.10 32.79 36.26 37.37 42.35 49.03 51.94 54.16 53.17 47.58 37.71b32.74 42.52
201235.03 36.76 34.84 41.07 44.03 48.57 53.87 54.35 50.17a46.03 42.57 35.84 43.59
201332.58 36.04 37.74 40.63 46.00 51.17 53.19 57.26 53.97 42.81 39.77 30.48 43.47
201435.81 33.86 38.81 42.30 47.71 49.41a55.97 56.87 54.53 50.42 40.10 38.77 45.38
201538.65 41.25 41.23 40.33 47.68 52.87 56.73a55.74 49.50 50.35 38.63 37.26 45.85
201637.13 40.69 39.77 45.20 48.32 51.70 54.23 54.94 50.17 48.29 44.60 32.16 45.60
201729.19 35.93 39.48 40.80 46.29 51.60 52.94 55.74 52.43 43.61 39.73 34.29 43.50
201839.42 34.36 36.68 41.50 48.90 49.20 54.58 54.87 49.13 45.55 40.66a36.48 44.28
201936.58 29.75 33.97 41.63 48.39 49.67 55.48 56.87 52.90 42.52 40.77 37.03 43.80
202037.71 36.55 35.71 41.30 47.52 50.93 54.68 53.87 55.53 46.19 39.43 37.68 44.76
202137.87 34.14 35.19 38.30 44.87 53.27 53.61 54.68 50.37 43.55 41.43 34.87 43.51
202234.61 33.71 38.06 37.17 44.03 50.77 55.77 57.87 52.83 47.58 35.03 32.81 43.35
202336.26 33.29 34.26 39.07 48.16 49.40 55.52 57.77 52.20 47.42 41.73 40.03 44.59
202434.45 37.46a38.11d-----z-----z-----z-----z-----z-----z-----z-----z-----z36.68i
Period of Record Statistics
MEAN33.28 34.59 36.32 39.30 44.10 48.80 52.15 52.44 49.08 44.18 38.54 34.53 42.26
S.D.3.97 3.23 2.40 2.18 2.28 2.44 2.11 2.38 2.54 2.48 2.86 2.91 1.67
SKEW-0.84 -0.24 0.02 0.09 -0.11 1.95 0.01 0.01 -0.09 -0.08 -0.31 -0.45 -0.26
MAX40.65 41.25 41.42 45.20 49.17 63.70 57.13 57.87 55.53 50.42 44.93 40.03 45.85
MIN20.77 25.41 30.03 34.60 37.03 44.33 46.48 46.52 40.97 37.17 31.27 26.97 38.49
YRS122 121 121 121 120 122 123 122 121 122 122 123 112