Weather History for Portland, OR

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Month of December, 2012

  Max Avg Min Sum
Temperature  
Max Temperature 57 °F 47 °F 36 °F
Mean Temperature 52 °F 43 °F 33 °F
Min Temperature 48 °F 38 °F 29 °F
Degree Days  
Heating Degree Days (base 65) 32 22 13 678
Cooling Degree Days (base 65) 0 0 0 0
Growing Degree Days (base 50) 2 0 0 3
Dew Point  
Dew Point 54 °F 39 °F 25 °F
Precipitation  
Precipitation 1.08 in 0.28 in 0.00 in 7.56 in
Snowdepth 0.0 in 0.0 in 0.0 in -
Wind  
Wind 38 mph 8 mph 0 mph
Gust Wind 48 mph 23 mph 16 mph
Sea Level Pressure  
Sea Level Pressure 30.46 in 29.97 in 29.16 in

Monthly Weather History Graph

Monthly Weather History Graph

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Date:

Astronomy

Dec. 16, 2012 Rise Set
Actual Time 7:45 AM PST 4:27 PM PST
Civil Twilight 7:10 AM PST 5:01 PM PST
Nautical Twilight 6:33 AM PST 5:39 PM PST
Astronomical Twilight 5:57 AM PST 6:15 PM PST
Moon 10:12 AM PST (12/16) 8:58 PM PST (12/16)
Length of Visible Light 9h 51m
Length of Day
8h 42m
Waxing Crescent, 17% of the Moon is Illuminated
Dec 16
Waxing Crescent
Dec 19
First Quarter
Dec 28
Full
Jan 4
Last Quarter
Jan 11
New

Weather History Calendar

Precipitation Actual month total 7.56 Normal Month Total: 5.49
Sunday Monday Tuesday Wednesday Thursday Friday Saturday
 
Rain
Actual:
54 | 46 0.54
Average:
48 | 37 0.21
Rain
Actual:
51 | 47 0.36
Average:
48 | 37 0.20
Rain
Actual:
54 | 48 0.23
Average:
48 | 37 0.20
Rain
Actual:
57 | 47 1.02
Average:
47 | 37 0.20
Rain
Actual:
51 | 39 0.03
Average:
47 | 36 0.19
Rain
Actual:
49 | 36 T
Average:
47 | 36 0.19
Rain
Actual:
49 | 42 0.05
Average:
47 | 36 0.19
Rain
Actual:
47 | 38 0.10
Average:
46 | 36 0.18
Rain
Actual:
49 | 40 0.08
Average:
46 | 36 0.18
Mostly Cloudy
Actual:
52 | 44 T
Average:
46 | 35 0.18
Rain
Actual:
47 | 41 0.15
Average:
46 | 35 0.17
Rain
Actual:
47 | 42 0.30
Average:
46 | 35 0.18
Mostly Cloudy
Actual:
48 | 39 0.00
Average:
46 | 35 0.17
Rain
Actual:
45 | 35 0.32
Average:
45 | 35 0.18
Rain
Actual:
41 | 35 0.32
Average:
45 | 35 0.18
Rain
Actual:
51 | 40 0.76
Average:
45 | 35 0.17
Rain
Actual:
50 | 36 0.16
Average:
45 | 35 0.17
Snow
Actual:
41 | 35 0.06
Average:
45 | 35 0.18
Rain
Actual:
51 | 37 0.48
Average:
45 | 35 0.17
Rain
Actual:
57 | 36 1.08
Average:
45 | 35 0.18
Rain
Actual:
46 | 34 0.05
Average:
45 | 35 0.17
Rain
Actual:
49 | 41 0.12
Average:
45 | 35 0.17
Rain
Actual:
43 | 37 0.51
Average:
45 | 35 0.17
Rain
Actual:
46 | 39 0.02
Average:
45 | 35 0.17
Rain
Actual:
43 | 38 0.71
Average:
45 | 35 0.17
Rain
Actual:
42 | 38 0.10
Average:
45 | 35 0.17
Mostly Cloudy
Actual:
47 | 38 0.01
Average:
45 | 35 0.16
Mostly Cloudy
Actual:
43 | 35 0.00
Average:
45 | 35 0.17
Rain
Actual:
41 | 29 T
Average:
45 | 35 0.16
Fog
Actual:
44 | 30 0.00
Average:
45 | 35 0.15
Snow
Actual:
36 | 30 T
Average:
45 | 35 0.16
 

Calendar Legend

Sunny
Clear
Mostly Cloudy
Partly Sunny
Partly Cloudy
Mostly Sunny
Cloudy Rain Snow
Hail
Flurries
Thunderstorms Hazy
Fog
Sleet '?' denotes
'chance of'
Unknown

Daily Weather History & Observations

2012 Temp. (°F) Dew Point (°F) Humidity (%) Sea Level Press. (in) Visibility (mi) Wind (mph) Precip. (in) Events
Dec high avg low high avg low high avg low high avg low high avg low high avg high sum  
1 54 50 46 48 45 42 100 83 66 29.75 29.60 29.33 10 9 4 25 12 35 0.54 Rain
2 51 49 47 47 45 42 100 86 71 29.93 29.66 29.27 10 10 5 25 14 30 0.36 Rain
3 54 51 48 47 45 43 93 82 71 30.05 29.96 29.69 10 10 4 21 12 26 0.23 Rain
4 57 52 47 54 50 45 100 93 86 29.97 29.79 29.63 10 6 2 17 6 22 1.02 Rain
5 51 45 39 44 40 37 96 78 59 30.26 30.19 30.01 10 10 8 14 3 17 0.03 Rain
6 49 43 36 45 41 36 100 86 71 30.25 30.21 30.16 10 10 7 18 10 24 T Rain
7 49 46 42 45 41 37 93 87 80 30.24 30.17 30.11 10 10 9 18 9 23 0.05 Rain
8 47 43 38 40 39 36 93 85 76 30.38 30.30 30.23 10 10 4 10 2 15 0.10 Rain
9 49 45 40 47 42 38 100 95 89 30.42 30.38 30.35 10 7 1 10 6 13 0.08 Rain
10 52 48 44 47 45 43 100 86 71 30.43 30.36 30.14 10 10 7 8 2 9 T  
11 47 44 41 45 42 39 100 92 83 30.13 29.81 29.63 10 10 9 18 8 23 0.15 Rain
12 47 45 42 42 40 39 100 88 76 30.03 29.88 29.71 10 10 6 15 5 17 0.30 Rain
13 48 44 39 41 38 35 96 81 65 30.06 29.97 29.87 10 10 9 10 5 12 0.00  
14 45 40 35 41 38 35 100 92 83 29.99 29.91 29.84 10 8 2 10 5 12 0.32 Rain
15 41 38 35 40 36 34 100 93 85 29.95 29.80 29.64 10 8 2 18 6 22 0.32 Rain
16 51 46 40 48 41 37 100 90 80 29.85 29.51 29.16 10 9 5 30 13 38 0.76 Rain
17 50 43 36 41 36 33 89 83 76 30.01 29.74 29.20 10 10 7 38 13 48 0.16 Rain
18 41 38 35 36 34 33 92 86 79 30.08 30.03 29.98 10 10 8 20 10 24 0.06 Rain , Snow
19 51 44 37 41 37 33 100 81 61 30.04 29.83 29.63 10 9 5 26 14 37 0.48 Rain
20 57 47 36 43 39 34 100 90 79 29.85 29.74 29.62 10 9 6 25 11 32 1.08 Rain
21 46 40 34 39 37 34 92 84 76 29.80 29.74 29.62 10 10 7 17 9 22 0.05 Rain
22 49 45 41 41 38 36 89 77 65 29.80 29.66 29.55 10 10 6 28 10 35 0.12 Rain
23 43 40 37 40 37 34 93 85 76 29.92 29.75 29.62 10 9 4 16 7 18 0.51 Rain
24 46 43 39 40 38 35 93 82 71 30.21 30.12 29.92 10 10 10 14 7 17 0.02 Rain
25 43 41 38 37 36 34 92 83 73 30.03 29.78 29.69 10 8 2 26 15 30 0.71 Rain
26 42 40 38 40 37 36 100 93 85 30.04 29.87 29.72 10 9 5 18 9 23 0.10 Rain
27 47 43 38 39 38 36 93 82 71 30.20 30.16 30.05 10 10 10 12 5 13 0.01  
28 43 39 35 36 33 27 92 79 65 30.19 30.15 30.12 10 10 10 14 6 16 0.00  
29 41 35 29 36 31 26 85 73 60 30.25 30.21 30.17 10 10 7 12 3 14 T Rain
30 44 37 30 34 29 25 96 75 53 30.33 30.29 30.24 10 7 0 10 3 12 0.00 Fog
31 36 33 30 31 28 25 92 78 64 30.46 30.35 30.29 10 8 4 14 6 16 T Snow