HEADWORKS PORTLAND WTR B, OR

Minimum of Minimum Temperature (Degrees Fahrenheit)

(353770)

File last updated on April 25, 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-----z32.00d38.00 41.00 44.00 44.00a44.00 30.00 37.00b31.00d-----z
190030.00b20.00c34.00a32.00a40.00a48.00a48.00 44.00 40.00 36.00c20.00c29.00e20.00t
190128.00 23.00b30.00e30.00 38.00a43.00 44.00 47.00 -----z42.00a33.00c26.00c-----z
19029.00c30.00 32.00 -----z-----z44.00 48.00 43.00 36.00b38.00 28.00b26.00d-----z
190325.00c20.00b-----z-----z-----z46.00 45.00 48.00 38.00 -----z-----z25.00a-----z
1904-----z-----z-----z-----z-----z-----z-----z-----z-----z-----z-----z27.00e-----z
1905-----z-----z-----z32.00 -----z-----z-----z-----z-----z-----z-----z-----z-----z
1906-----z-----z-----z-----z38.00 40.00 48.00 44.00 38.00 32.00 28.00 22.00 -----z
190710.00 30.00g29.00 32.00 33.00 42.00 45.00 42.00 38.00 40.00 31.00 28.00a10.00h
190824.00 22.00 28.00 31.00 37.00 39.00 44.00 40.00 30.00 36.00 29.00 21.00 21.00
19091.00 31.00 29.00 28.00 32.00 38.00 43.00 41.00 38.00 33.00 24.00 21.00 1.00
191015.00 21.00 30.00 32.00 37.00 37.00a41.00 49.00 36.00 37.00b27.00b30.00 15.00e
191120.00a29.00a28.00b33.00a35.00a42.00b35.00a37.00 29.00 31.00 22.00 27.00 20.00i
191222.00b29.00 27.00 28.00 34.00 40.00 45.00 43.00a41.00 34.00d28.00 29.00a22.00h
191317.00a24.00 22.00 29.00 -----z39.00 44.00 31.00 35.00a31.00 28.00 26.00 -----z
191430.00 27.00 31.00 31.00 35.00b38.00b38.00 44.00 40.00 35.00 30.00 16.00 16.00d
191522.00 27.00 30.00 31.00a33.00 42.00b43.00 46.00 40.00b34.00a31.00a23.00a22.00h
191615.00c21.00a24.00 33.00 31.00 38.00b40.00 40.00a41.00 30.00a24.00 22.00 15.00h
191719.00c28.00 22.00 31.00a33.00 39.00 41.00 -----z44.00 29.00 31.00 33.00a-----z
191820.00 23.00 25.00 28.00 34.00 42.00 39.00 43.00 33.00 36.00 32.00 25.00 20.00
191920.00 27.00 30.00 32.00 33.00 37.00 42.00a45.00 34.00 30.00 19.00 9.00c9.00d
192024.00 25.00 27.00 30.00 31.00 38.00 42.00 44.00 41.00 32.00 26.00 28.00 24.00
192125.00 28.00 30.00 30.00a35.00 49.00 42.00 44.00 34.00 35.00a33.00a18.00c18.00f
192210.00a17.00 23.00b29.00 33.00b40.00 42.00 41.00b42.00 32.00b27.00a14.00a10.00k
192322.00b20.00 24.00 32.00 36.00 41.00 46.00 41.00 38.00 33.00 33.00 17.00 17.00b
192411.00a31.00 30.00 29.00 34.00 40.00 42.00 41.00a39.00b33.00 30.00a5.00 5.00e
192530.00 29.00 28.00 33.00 33.00 41.00a45.00b44.00 40.00 32.00b27.00a30.00b27.00h
192626.00b31.00b30.00 35.00 33.00 40.00 40.00 46.00a40.00 36.00 36.00d19.00g19.00p
192718.00 22.00 28.00 28.00 34.00c40.00 44.00 45.00 39.00 31.00 31.00 14.00 14.00c
192814.00 24.00 31.00 30.00 33.00 42.00 45.00 42.00 37.00a30.00b30.00 25.00a14.00d
192915.00 8.00 30.00 29.00a36.00 38.00 40.00 40.00a37.00 31.00 26.00 28.00a8.00c
19306.00 28.00 25.00 34.00 34.00a38.00 41.00 43.00 41.00 34.00 28.00 26.00 6.00a
193128.00a29.00a28.00 29.00 36.00 42.00 44.00 39.00 39.00a34.00a23.00a24.00 23.00e
193221.00 14.00 31.00 33.00 35.00 42.00 40.00 46.00 37.00 33.00 32.00 9.00 9.00
193318.00 7.00 27.00 30.00 37.00 35.00 43.00 44.00 34.00 33.00 22.00 29.00 7.00
193432.00 31.00 31.00 32.00 32.00b43.00 44.00 47.00 34.00 33.00 36.00 30.00 30.00b
19356.00 18.00 27.00a30.00 34.00 40.00 41.00 40.00 38.00 22.00 14.00 23.00 6.00a
193618.00a9.00 26.00 29.00 37.00a44.00 45.00 45.00 38.00a35.00 22.00 25.00 9.00c
19376.00 21.00 30.00 32.00 35.00 44.00 46.00 41.00 39.00 38.00 32.00 29.00 6.00
193825.00 27.00 31.00 30.00 36.00 37.00 45.00 41.00 45.00 33.00 23.00a26.00 23.00a
193929.00 22.00 29.00 30.00 34.00 39.00 43.00 42.00 39.00 37.00 33.00 27.00 22.00
194024.00a30.00 30.00 34.00 36.00 40.00 42.00 47.00 42.00 37.00 30.00 25.00 24.00a
194127.00 30.00 28.00 35.00 37.00 42.00 45.00 43.00 40.00 37.00 28.00 19.00 19.00
194213.00 28.00 27.00 34.00 33.00 39.00 47.00 45.00 39.00 34.00 31.00 30.00 13.00
19438.00 27.00 27.00 34.00 33.00 42.00 46.00a43.00 40.00 36.00 31.00 27.00 8.00a
194422.00 27.00 26.00 33.00 36.00 41.00 45.00 40.00 34.00 39.00 28.00 22.00 22.00
194525.00 26.00a24.00 29.00 39.00 38.00 42.00 42.00 36.00 31.00 31.00 22.00 22.00a
194628.00 30.00 30.00 33.00 37.00 44.00 45.00 41.00 37.00 29.00 27.00 24.00 24.00
194716.00 27.00 30.00 32.00 36.00 42.00a46.00 40.00 37.00a37.00 28.00 28.00 16.00b
194826.00 21.00 27.00 30.00 33.00 47.00 41.00 43.00 37.00a29.00 29.00 18.00 18.00a
194910.00a13.00 28.00a29.00 33.00 38.00a42.00a42.00 40.00a26.00a31.00 24.00a10.00g
19502.00 10.00 27.00 28.00 30.00 33.00 45.00a45.00 35.00 32.00 27.00 32.00 2.00a
195113.00c23.00 25.00a29.00 34.00a39.00 42.00a41.00b38.00 31.00a28.00a24.00 13.00j
195217.00a28.00a29.00 29.00a33.00 40.00 43.00 41.00 39.00a35.00 26.00 28.00a17.00e
195331.00a29.00 27.00a29.00 35.00 38.00 40.00 45.00 40.00 33.00 33.00 30.00 27.00b
195415.00a27.00 23.00 30.00 28.00a37.00a41.00a41.00a35.00 29.00a27.00a25.00 15.00g
195520.00 24.00 20.00 30.00 32.00 38.00 44.00 41.00a37.00 36.00a11.00a22.00a11.00d
195617.00a14.00 23.00 29.00 35.00a41.00a43.00 46.00 39.00 32.00 27.00 20.00 14.00c
19577.00 24.00 28.00 31.00 39.00 41.00 41.00 41.00a40.00 33.00 25.00 28.00 7.00a
195828.00 29.00a27.00 33.00 35.00 48.00 46.00 47.00 40.00 33.00 26.00a35.00 26.00b
195915.00 25.00 31.00 31.00 36.00 42.00 40.00 42.00 41.00 33.00 24.00 24.00 15.00
196024.00 21.00a25.00 34.00 36.00 42.00 44.00 44.00 37.00 32.00 29.00a30.00 21.00b
196126.00 32.00 32.00 32.00 38.00 42.00 46.00 47.00 36.00a32.00 24.00 18.00 18.00a
196210.00 17.00 30.00 34.00 34.00 40.00 41.00 45.00 43.00 35.00 28.00 25.00 10.00
19639.00 33.00a31.00 31.00 36.00 43.00 45.00 48.00 46.00a36.00 31.00 26.00 9.00b
196431.00 28.00 31.00 31.00 33.00 41.00 47.00 47.00 42.00 36.00a29.00 9.00 9.00a
196529.00 30.00 28.00 32.00 33.00 41.00 44.00 44.00 35.00 41.00 31.00 21.00a21.00a
196624.00 29.00 29.00 34.00 35.00 37.00 47.00 47.00 45.00 35.00 34.00 32.00 24.00
196732.00 31.00 30.00 33.00 37.00 45.00 46.00 49.00 46.00 39.00 32.00 22.00 22.00
196823.00a30.00 31.00 30.00 37.00 42.00 48.00 46.00 44.00 36.00 31.00 8.00 8.00a
196913.00a28.00 26.00 35.00 35.00 47.00 45.00 44.00 42.00 37.00 31.00 29.00 13.00a
197026.00 33.00 32.00 31.00a34.00 42.00 45.00 44.00 34.00 32.00 26.00 27.00 26.00a
197122.00 28.00 19.00 29.00 38.00 39.00 43.00 44.00 36.00 28.00 21.00 25.00 19.00
197212.00 24.00 31.00 30.00 34.00 42.00 43.00 43.00 34.00 28.00 32.00 5.00 5.00
197321.00a30.00 32.00 33.00 38.00 38.00 43.00 43.00 40.00a36.00 30.00 32.00 21.00b
197412.00 29.00 27.00 35.00 32.00 40.00 46.00 46.00 41.00 37.00 31.00 28.00 12.00
197522.00 25.00 29.00 30.00 37.00 41.00 48.00 42.00 43.00 38.00a29.00 31.00 22.00a
197626.00 28.00 23.00 32.00 36.00 38.00 45.00 49.00a41.00 36.00 25.00 27.00a23.00b
197721.00 34.00 32.00 30.00 37.00 42.00 45.00 47.00 42.00 39.00a22.00 30.00 21.00a
197826.00d30.00 30.00 30.00 35.00 44.00 46.00 48.00 43.00 32.00 23.00 14.00 14.00d
19799.00 13.00 31.00 35.00 38.00 40.00 43.00 47.00 43.00 40.00a32.00 31.00 9.00a
198012.00 29.00 32.00 31.00 38.00 42.00 47.00 44.00 42.00 35.00 32.00 25.00b12.00b
198133.00a26.00 33.00 32.00 37.00 43.00 44.00 46.00 42.00 36.00 30.00 30.00 26.00a
198214.00 20.00 30.00a31.00 33.00 41.00 45.00 49.00 41.00a37.00b30.00 27.00a14.00e
198333.00a36.00a34.00 31.00a38.00 35.00 47.00 49.00a37.00 38.00 30.00 11.00b11.00f
198423.00a30.00 33.00a33.00a32.00a39.00 44.00 46.00 40.00a35.00 33.00 17.00 17.00e
198525.00a14.00 29.00 33.00a32.00a42.00 46.00 40.00 41.00 28.00 16.00 20.00a14.00d
198633.00 27.00 31.00 33.00 35.00 42.00 45.00 45.00 42.00 40.00a33.00 29.00a27.00b
198722.00 25.00a31.00 34.00 38.00 40.00 47.00 45.00 -----z37.00 30.00 22.00 -----z
198827.00 20.00 28.00a32.00 36.00 41.00 44.00 45.00 41.00 38.00 31.00b26.00 20.00c
198927.00 5.00 24.00 34.00 35.00 44.00 47.00 48.00 43.00 33.00 34.00 26.00 5.00
199028.00 19.00 29.00 35.00 39.00 44.00 48.00 47.00 45.00 35.00 35.00 5.00 5.00
199125.00 32.00 31.00 33.00 37.00 38.00 43.00a45.00 41.00 28.00 31.00 30.00 25.00a
199230.00 32.00 34.00 34.00 37.00 42.00 49.00 45.00 40.00 36.00a33.00a26.00 26.00b
199322.00a23.00 31.00 38.00 41.00b45.00 47.00 46.00 39.00 38.00c20.00 24.00 20.00f
199428.00 23.00 30.00 34.00a38.00 43.00 45.00 49.00 45.00 37.00 29.00 25.00 23.00a
199530.00a21.00 29.00 33.00 39.00a43.00 47.00 46.00 47.00 34.00 29.00 28.00 21.00b
199611.00 19.00 27.00 37.00 34.00 42.00 43.00 45.00 42.00 34.00a30.00a29.00a11.00c
199722.00 30.00 32.00 31.00a37.00b-----z49.00b51.00a46.00b33.00b34.00a27.00 -----z
199825.00a30.00a30.00 34.00 42.00 46.00 52.00 48.00 41.00a35.00 37.00b9.00a9.00f
199929.00 30.00 31.00 31.00 33.00 39.00a45.00 49.00 41.00 34.00 34.00 26.00 26.00a
200030.00 29.00 31.00 34.00 37.00a41.00 45.00 44.00 36.00 37.00 27.00a30.00 27.00b
200129.00a27.00 30.00 31.00 36.00 41.00 45.00 49.00 44.00 34.00 32.00 31.00 27.00a
200226.00 29.00 28.00a33.00 33.00 42.00 44.00 45.00 43.00 28.00 30.00 33.00 26.00a
200331.00 27.00 31.00a33.00a35.00 43.00 46.00a47.00 44.00 33.00 26.00a30.00 26.00d
200417.00a32.00 34.00a33.00 40.00 44.00 47.00 52.00 44.00 31.00 31.00a31.00 17.00c
200526.00 29.00 33.00 34.00 39.00a43.00 47.00 48.00 40.00 38.00 31.00 26.00 26.00a
200635.00 19.00a30.00a34.00a33.00 45.00a45.00 48.00a45.00 33.00a25.00 27.00 19.00f
200720.00a25.00 32.00 32.00a37.00 43.00c49.00a46.00 42.00 33.00 28.00b27.00c20.00k
200823.00 31.00 32.00 30.00 38.00 42.00 46.00a49.00 45.00d35.00 34.00b17.00c17.00j
200922.00 28.00 29.00 32.00 37.00 44.00 47.00 48.00a45.00 39.00 33.00 14.00 14.00a
201035.00a30.00b30.00 34.00 33.00 45.00 45.00 46.00 46.00 38.00 18.00 24.00 18.00c
201125.00 16.00 31.00 31.00 34.00 44.00 45.00 47.00 45.00 36.00 32.00b28.00 16.00b
201230.00 31.00 30.00 33.00 33.00 43.00 45.00 44.00 42.00a40.00 36.00 29.00 29.00a
201321.00 30.00 31.00 33.00 34.00 45.00 47.00 52.00 47.00 33.00 27.00 13.00 13.00
201430.00 18.00 32.00 37.00 41.00 44.00a49.00 50.00 48.00 45.00 27.00 24.00 18.00a
201528.00 30.00 31.00 35.00 41.00 43.00 49.00a48.00 42.00 41.00 26.00 30.00 26.00a
201625.00 31.00 33.00 38.00 43.00 44.00 50.00 49.00 44.00 43.00 39.00 24.00 24.00
201714.00 31.00 32.00 34.00 37.00 43.00 46.00 47.00 44.00 36.00 33.00 27.00 14.00
201835.00 19.00 31.00 33.00 39.00 41.00 46.00 46.00 45.00 40.00 33.00a31.00 19.00a
201929.00 22.00 25.00 35.00 36.00 42.00 49.00 49.00 39.00 30.00 26.00 30.00 22.00
202029.00 31.00 29.00 32.00 37.00 42.00 47.00 46.00 49.00 32.00 31.00 29.00 29.00
202131.00 21.00 29.00 30.00 39.00 45.00 46.00 46.00 41.00 35.00 33.00 25.00 21.00
202224.00 19.00 28.00 31.00 36.00 44.00 47.00 49.00 47.00 40.00 29.00 17.00 17.00
202323.00 20.00 31.00 32.00 41.00 42.00 48.00 45.00 44.00 30.00 29.00 33.00 20.00
202412.00 33.00a29.00 35.00f-----z-----z-----z-----z-----z-----z-----z-----z-----z
Period of Record Statistics
MEAN21.66 25.10 28.96 31.90 35.60 41.39 44.61 44.80 40.26 34.42 28.79 24.33 17.38
S.D.7.82 6.20 2.98 2.17 2.65 2.78 2.71 3.24 3.82 3.71 4.66 6.55 7.30
SKEW-0.52 -1.05 -0.91 0.32 0.20 -0.03 -0.39 -0.60 -0.25 -0.10 -0.98 -1.22 -0.30
MAX35.00 36.00 34.00 38.00 43.00 49.00 52.00 52.00 49.00 45.00 39.00 35.00 30.00
MIN1.00 5.00 19.00 28.00 28.00 33.00 35.00 31.00 29.00 22.00 11.00 5.00 1.00
YRS122 121 121 121 120 122 123 122 121 122 122 123 89