Weather History for Portland, OR

Change the Weather History Date:

Month of December, 2009

  Max Avg Min Sum
Temperature  
Max Temperature 53 °F 42 °F 30 °F
Mean Temperature 48 °F 36 °F 21 °F
Min Temperature 44 °F 30 °F 12 °F
Degree Days  
Heating Degree Days (base 65) 44 29 17 906
Cooling Degree Days (base 65) 0 0 0 0
Growing Degree Days (base 50) 0 0 0 0
Dew Point  
Dew Point 51 °F 27 °F -6 °F
Precipitation  
Precipitation 1.08 in 0.14 in 0.00 in 3.76 in
Snowdepth 2.0 in 0.1 in 0.0 in -
Wind  
Wind 37 mph 9 mph 0 mph
Gust Wind 45 mph 25 mph 16 mph
Sea Level Pressure  
Sea Level Pressure 30.49 in 30.10 in 29.65 in

Monthly Weather History Graph

Monthly Weather History Graph

Search for Another Location

Airport:

Trip Planner

Search our weather history database for the weather conditions in past years. The results will help you decide how hot, cold, wet, or windy it might be!

Date:

Astronomy

Dec. 25, 2009 Rise Set
Actual Time 7:49 AM PST 4:31 PM PST
Civil Twilight 7:15 AM PST 5:06 PM PST
Nautical Twilight 6:37 AM PST 5:43 PM PST
Astronomical Twilight 6:01 AM PST 6:20 PM PST
Moon 11:59 AM PST (12/25) 1:03 AM PST (12/25)
Length of Visible Light 9h 50m
Length of Day
8h 42m
First Quarter, 61% of the Moon is Illuminated
Dec 25
First Quarter
Dec 31
Full
Jan 7
Last Quarter
Jan 14
New
Jan 23
First Quarter

Weather History Calendar

Precipitation Actual month total 3.76 Normal Month Total: 5.71
Sunday Monday Tuesday Wednesday Thursday Friday Saturday
 
Partly Cloudy
Actual:
53 | 42 0.00
Average:
47 | 37 0.20
Clear
Actual:
51 | 31 0.00
Average:
47 | 37 0.20
Partly Cloudy
Actual:
47 | 35 0.00
Average:
47 | 37 0.20
Partly Cloudy
Actual:
43 | 25 T
Average:
47 | 36 0.20
Fog
Actual:
44 | 27 0.00
Average:
47 | 36 0.19
Partly Cloudy
Actual:
39 | 28 0.00
Average:
47 | 36 0.19
Scattered Clouds
Actual:
31 | 23 0.00
Average:
46 | 36 0.19
Scattered Clouds
Actual:
32 | 14 0.00
Average:
46 | 36 0.19
Scattered Clouds
Actual:
30 | 12 0.00
Average:
46 | 36 0.19
Clear
Actual:
34 | 13 0.00
Average:
46 | 36 0.19
Partly Cloudy
Actual:
34 | 14 0.00
Average:
46 | 35 0.19
Rain
Actual:
34 | 30 0.01
Average:
46 | 35 0.19
Rain
Actual:
41 | 25 T
Average:
45 | 35 0.19
Rain
Actual:
44 | 36 0.51
Average:
45 | 35 0.19
Snow
Actual:
40 | 35 1.08
Average:
45 | 35 0.18
Rain
Actual:
51 | 38 0.54
Average:
45 | 35 0.18
Rain
Actual:
46 | 37 0.06
Average:
45 | 35 0.18
Fog
Actual:
50 | 34 T
Average:
45 | 35 0.18
Rain
Actual:
46 | 42 0.06
Average:
45 | 34 0.18
Rain
Actual:
48 | 44 0.14
Average:
45 | 34 0.18
Rain
Actual:
52 | 38 0.30
Average:
45 | 34 0.18
Rain
Actual:
42 | 29 T
Average:
45 | 34 0.18
Fog
Actual:
35 | 29 0.00
Average:
45 | 34 0.18
Fog
Actual:
38 | 28 0.00
Average:
45 | 34 0.18
Fog
Actual:
42 | 24 0.00
Average:
45 | 34 0.18
Scattered Clouds
Actual:
42 | 34 0.00
Average:
44 | 34 0.18
Rain
Actual:
41 | 32 T
Average:
44 | 34 0.17
Scattered Clouds
Actual:
43 | 27 0.00
Average:
44 | 34 0.17
Snow
Actual:
38 | 26 0.16
Average:
44 | 34 0.17
Snow
Actual:
38 | 32 0.05
Average:
44 | 34 0.17
Rain
Actual:
42 | 34 0.85
Average:
44 | 34 0.17
 

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

2009 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 53 48 42 43 35 21 96 67 38 30.24 30.20 30.14 10 8 2 22 9 29 0.00  
2 51 41 31 31 25 20 89 61 32 30.22 30.17 30.13 10 10 10 26 11 33 0.00  
3 47 41 35 26 23 21 64 51 38 30.28 30.24 30.21 10 10 10 18 12 23 0.00  
4 43 34 25 33 28 24 92 77 62 30.29 30.24 30.19 10 9 5 10 2 12 T  
5 44 36 27 32 29 23 100 75 50 30.37 30.30 30.06 10 3 0 22 4 28 0.00 Fog
6 39 34 28 25 9 0 64 45 25 30.07 30.05 30.03 10 10 10 37 20 43 0.00  
7 31 27 23 0 -3 -5 35 29 22 30.09 30.06 30.03 10 10 10 30 19 38 0.00  
8 32 23 14 9 -2 -6 67 44 20 30.33 30.23 30.08 10 10 10 22 10 25 0.00  
9 30 21 12 12 5 0 74 52 29 30.35 30.29 30.21 10 10 10 7 2 18 0.00  
10 34 24 13 16 11 7 88 61 33 30.20 30.12 30.03 10 9 7 5 1 8 0.00  
11 34 24 14 23 16 11 88 68 47 30.03 29.91 29.82 10 9 7 8 3 9 0.00  
12 34 32 30 31 28 21 100 82 63 29.80 29.70 29.65 10 4 0 8 3 9 0.01 Rain
13 41 33 25 35 31 23 100 87 73 30.00 29.89 29.69 10 7 2 20 7 28 T Rain
14 44 40 36 39 36 34 100 87 73 30.08 29.97 29.81 10 9 5 23 11 29 0.51 Rain
15 40 38 35 40 37 34 100 96 92 29.91 29.84 29.78 10 4 2 26 15 32 1.08 Rain , Snow
16 51 45 38 51 42 37 100 96 92 30.21 30.03 29.92 10 8 3 18 11 21 0.54 Rain
17 46 42 37 44 42 37 100 95 89 30.28 30.24 30.21 10 7 0 14 6 17 0.06 Fog , Rain
18 50 42 34 42 38 35 100 86 71 30.28 30.23 30.15 10 6 0 15 5 18 T Fog
19 46 44 42 43 42 38 100 88 76 30.14 30.08 29.95 10 8 2 15 8 17 0.06 Rain
20 48 46 44 46 43 41 100 93 86 29.93 29.79 29.71 10 10 5 22 14 25 0.14 Rain
21 52 45 38 48 40 34 100 90 79 29.94 29.80 29.67 10 9 3 21 9 25 0.30 Rain
22 42 36 29 36 33 29 96 82 67 30.40 30.17 29.94 10 9 2 10 2 13 T Fog , Rain
23 35 32 29 34 32 28 100 96 92 30.49 30.45 30.41 2 0 0 7 2 13 0.00 Fog
24 38 33 28 34 31 27 100 93 85 30.44 30.33 30.27 8 2 0 8 3 9 0.00 Fog
25 42 33 24 30 26 22 100 76 51 30.26 30.20 30.09 10 6 0 29 13 37 0.00 Fog
26 42 38 34 24 23 22 59 53 46 30.09 30.05 30.00 10 10 10 36 25 45 0.00  
27 41 37 32 29 25 22 75 63 50 30.28 30.18 30.10 10 10 10 23 14 29 T Rain
28 43 35 27 29 27 26 92 73 53 30.31 30.23 30.16 10 10 9 16 7 20 0.00  
29 38 32 26 31 29 25 92 78 64 30.15 29.94 29.86 10 5 0 22 8 28 0.16 Fog , Snow
30 38 35 32 36 33 30 96 93 89 30.22 30.12 29.96 10 9 7 16 8 18 0.05 Rain , Snow
31 42 38 34 43 38 33 100 93 85 30.18 29.94 29.87 10 6 1 22 12 26 0.85 Rain