Template:Portland, Oregon weatherbox

Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
Record high °F (°C) 66
(19)
71
(22)
80
(27)
90
(32)
100
(38)
102
(39)
107
(42)
107
(42)
105
(41)
92
(33)
73
(23)
65
(18)
107
(42)
Mean maximum °F (°C) 58.1
(14.5)
60.1
(15.6)
69.6
(20.9)
78.4
(25.8)
86.8
(30.4)
91.7
(33.2)
96.7
(35.9)
96.7
(35.9)
91.2
(32.9)
77.6
(25.3)
63.8
(17.7)
58.3
(14.6)
100.0
(37.8)
Average high °F (°C) 46.9
(8.3)
50.9
(10.5)
56.2
(13.4)
61.4
(16.3)
68.8
(20.4)
73.8
(23.2)
81.4
(27.4)
81.8
(27.7)
76.2
(24.6)
63.9
(17.7)
52.9
(11.6)
46.3
(7.9)
63.4
(17.4)
Average low °F (°C) 36.1
(2.3)
36.6
(2.6)
39.6
(4.2)
43.5
(6.4)
49.4
(9.7)
54.1
(12.3)
58.5
(14.7)
58.8
(14.9)
54.1
(12.3)
46.7
(8.2)
40.6
(4.8)
36.1
(2.3)
46.2
(7.9)
Mean minimum °F (°C) 25.1
(−3.8)
25.9
(−3.4)
30.4
(−0.9)
34.8
(1.6)
40.5
(4.7)
47.3
(8.5)
52.3
(11.3)
51.7
(10.9)
45.7
(7.6)
35.9
(2.2)
29.2
(−1.6)
24.9
(−3.9)
20.8
(−6.2)
Record low °F (°C) −2
(−19)
−3
(−19)
19
(−7)
29
(−2)
29
(−2)
39
(4)
43
(6)
44
(7)
34
(1)
26
(−3)
13
(−11)
6
(−14)
−3
(−19)
Average precipitation inches (mm) 5.02
(128)
3.68
(93)
3.97
(101)
2.88
(73)
2.50
(64)
1.63
(41)
0.50
(13)
0.54
(14)
1.52
(39)
3.41
(87)
5.45
(138)
5.77
(147)
36.87
(936)
Average snowfall inches (cm) 1.7
(4.3)
1.2
(3.0)
0.1
(0.25)
0
(0)
0
(0)
0
(0)
0
(0)
0
(0)
0
(0)
0
(0)
0.04
(0.10)
1.3
(3.3)
4.3
(11)
Average precipitation days (≥ 0.01 in) 18.6 15.5 17.7 17.2 13.0 9.1 3.6 3.6 6.6 13.5 18.3 19.2 155.8
Average snowy days (≥ 0.1 in) 0.7 1.5 0.2 0 0 0 0 0 0 0 0.5 1.5 4.4
Average relative humidity (%) 80.9 78.0 74.6 71.6 68.7 65.8 62.8 64.8 69.4 77.9 81.5 82.7 73.2
Average dew point °F (°C) 33.6
(0.9)
36.1
(2.3)
38.3
(3.5)
40.8
(4.9)
45.3
(7.4)
49.8
(9.9)
52.9
(11.6)
53.8
(12.1)
50.7
(10.4)
46.2
(7.9)
40.3
(4.6)
35.1
(1.7)
43.6
(6.4)
Mean monthly sunshine hours 85.6 116.4 191.1 221.1 276.1 290.2 331.9 298.1 235.7 151.7 79.3 63.7 2,340.9
Percent possible sunshine 30 40 52 54 60 62 70 68 63 45 28 23 52
Average ultraviolet index 1 2 3 5 6 7 8 7 5 3 2 1 4
Source 1: NOAA (relative humidity, dewpoint and sun 1961–1990)[3][4][5]
Source 2: Weather Atlas [6] (UV index)

Notes

  1. ^ Mean monthly maxima and minima (i.e. the highest and lowest temperature readings during an entire month or year) calculated based on data at said location from 1991 to 2020.
  2. ^ Official records for Portland have been kept at PDX since 13 October 1940.[1] In January 1996, snow measurements for PDX were moved to the NWS Portland office 4 mi (6.4 km) to the east at 5241 NE 122nd Avenue, Portland, OR 97230-1089.[2]

References

  1. ^ ThreadEx
  2. ^ "AIRPORT Portland: Monthly and Seasonal Snowfall (inches)" (PDF). NWS Portland, OR. Retrieved 2014-06-22.
  3. ^ "NowData – NOAA Online Weather Data". National Oceanic and Atmospheric Administration. Retrieved 2016-04-11.
  4. ^ "Station Name: OR PORTLAND INTL AP". National Oceanic and Atmospheric Administration. Retrieved 2014-03-13.
  5. ^ "WMO Climate Normals for PORTLAND OR 1961–1990". National Oceanic and Atmospheric Administration. Retrieved 2020-07-18.
  6. ^ "Portland, Oregon, USA - Monthly weather forecast and Climate data". Weather Atlas. Retrieved 14 June 2019.