Weather History for Williamsport, PA

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Month of December, 2011

  Max Avg Min Sum
Temperature  
Max Temperature 57 °F 44 °F 32 °F
Mean Temperature 51 °F 37 °F 26 °F
Min Temperature 45 °F 29 °F 18 °F
Degree Days  
Heating Degree Days (base 65) 39 28 14 878
Cooling Degree Days (base 65) 0 0 0 0
Growing Degree Days (base 50) 2 0 0 2
Dew Point  
Dew Point 54 °F 29 °F 10 °F
Precipitation  
Precipitation 1.55 in 0.16 in 0.00 in 3.68 in
Snowdepth 1.0 in 0.0 in 0.0 in -
Wind  
Wind 30 mph 5 mph 0 mph
Gust Wind 41 mph 21 mph 16 mph
Sea Level Pressure  
Sea Level Pressure 30.67 in 30.15 in 29.34 in

Monthly Weather History Graph

Monthly Weather History Graph

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Date:

Astronomy

Dec. 11, 2011 Rise Set
Actual Time 7:22 AM EST 4:38 PM EST
Civil Twilight 6:51 AM EST 5:09 PM EST
Nautical Twilight 6:17 AM EST 5:44 PM EST
Astronomical Twilight 5:43 AM EST 6:17 PM EST
Moon 5:46 PM EST (12/11) 8:09 AM EST (12/11)
Length of Visible Light 10h 17m
Length of Day
9h 15m
Full, 99% of the Moon is Illuminated
Dec 11
Full
Dec 17
Last Quarter
Dec 24
New
Jan 1
First Quarter
Jan 9
Full

Weather History Calendar

Precipitation Actual month total 3.68 Normal Month Total: 2.93
Sunday Monday Tuesday Wednesday Thursday Friday Saturday
 
Scattered Clouds
Actual:
49 | 29 0.00
Average:
43 | 29 0.12
Partly Cloudy
Actual:
45 | 25 0.00
Average:
43 | 29 0.11
Clear
Actual:
44 | 25 0.00
Average:
42 | 28 0.12
Partly Cloudy
Actual:
50 | 34 0.00
Average:
42 | 28 0.12
Rain
Actual:
55 | 39 0.01
Average:
41 | 28 0.11
Rain
Actual:
57 | 45 0.23
Average:
41 | 27 0.11
Snow
Actual:
45 | 33 1.55
Average:
41 | 27 0.11
Partly Cloudy
Actual:
41 | 29 T
Average:
40 | 27 0.11
Partly Cloudy
Actual:
45 | 28 0.00
Average:
40 | 26 0.12
Partly Cloudy
Actual:
38 | 24 T
Average:
40 | 26 0.11
Clear
Actual:
36 | 19 0.00
Average:
39 | 26 0.11
Clear
Actual:
39 | 18 0.00
Average:
39 | 25 0.11
Clear
Actual:
44 | 19 0.00
Average:
39 | 25 0.09
Rain
Actual:
44 | 26 0.05
Average:
38 | 25 0.09
Rain
Actual:
48 | 41 0.08
Average:
38 | 24 0.09
Partly Cloudy
Actual:
51 | 35 0.00
Average:
38 | 24 0.09
Snow
Actual:
37 | 26 T
Average:
37 | 24 0.08
Partly Cloudy
Actual:
35 | 20 0.00
Average:
37 | 24 0.08
Rain
Actual:
43 | 24 T
Average:
37 | 23 0.08
Rain
Actual:
42 | 36 0.03
Average:
37 | 23 0.08
Thunderstorm
Actual:
49 | 37 0.53
Average:
36 | 23 0.09
Rain
Actual:
51 | 43 0.22
Average:
36 | 22 0.08
Rain
Actual:
45 | 28 0.34
Average:
36 | 22 0.09
Snow
Actual:
36 | 27 T
Average:
36 | 22 0.08
Partly Cloudy
Actual:
45 | 30 0.00
Average:
36 | 22 0.09
Partly Cloudy
Actual:
43 | 26 T
Average:
36 | 21 0.08
Rain
Actual:
43 | 26 0.62
Average:
35 | 21 0.08
Rain
Actual:
42 | 25 T
Average:
35 | 21 0.08
Snow
Actual:
32 | 19 0.01
Average:
35 | 21 0.07
Rain
Actual:
40 | 32 T
Average:
35 | 21 0.08
Rain
Actual:
45 | 30 0.01
Average:
35 | 20 0.07
 

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

2011 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 49 39 29 30 28 25 85 66 46 30.32 30.25 30.12 10 10 10 15 5 18 0.00  
2 45 35 25 31 27 23 100 76 51 30.57 30.37 30.29 10 8 1 16 3 22 0.00  
3 44 35 25 28 26 22 92 71 49 30.67 30.60 30.53 10 10 8 12 2 16 0.00  
4 50 42 34 36 34 26 79 68 56 30.51 30.42 30.34 10 10 9 18 7 28 0.00  
5 55 47 39 48 39 36 86 75 63 30.34 30.24 30.09 10 10 6 17 5 24 0.01 Rain
6 57 51 45 54 50 41 100 91 82 30.06 29.99 29.92 10 5 1 17 3 29 0.23 Rain
7 45 39 33 43 37 30 96 91 85 29.94 29.81 29.70 10 6 2 12 5 15 1.55 Rain , Snow
8 41 35 29 30 26 23 82 71 59 30.31 30.11 29.80 10 10 9 24 8 33 T  
9 45 37 28 32 27 24 89 69 49 30.31 30.25 30.19 10 9 6 13 2 14 0.00  
10 38 31 24 29 20 11 92 64 35 30.53 30.36 30.24 10 9 6 17 6 22 T  
11 36 28 19 20 18 16 88 68 47 30.67 30.60 30.53 10 10 8 7 2 8 0.00  
12 39 29 18 23 19 15 88 66 44 30.60 30.53 30.45 10 8 5 8 1 10 0.00  
13 44 32 19 25 22 17 92 69 45 30.49 30.45 30.39 10 8 4 12 2 15 0.00  
14 44 35 26 36 30 26 92 71 49 30.43 30.34 30.20 10 8 5 16 4 24 0.05 Rain
15 48 45 41 45 40 33 100 80 60 30.17 29.86 29.76 10 6 0 17 8 28 0.08 Fog , Rain
16 51 43 35 34 24 21 86 64 41 30.19 30.10 29.80 10 10 10 30 12 41 0.00  
17 37 32 26 29 22 15 64 56 47 30.21 30.17 30.14 10 10 8 13 6 17 T Snow
18 35 28 20 21 18 14 81 68 54 30.30 30.26 30.21 10 10 10 8 1 10 0.00  
19 43 34 24 33 26 21 88 70 51 30.22 30.08 29.99 10 9 6 9 2 10 T Rain
20 42 39 36 36 33 29 92 76 60 30.19 30.12 30.02 10 10 6 12 3 14 0.03 Rain
21 49 43 37 45 40 34 92 88 83 30.06 29.83 29.69 10 5 1 16 7 25 0.53 Rain , Thunderstorm
22 51 47 43 43 42 40 89 80 71 30.11 30.01 29.88 10 9 2 10 2 14 0.22 Rain
23 45 37 28 43 36 21 100 80 59 30.25 30.01 29.86 10 8 2 13 5 18 0.34 Rain
24 36 32 27 25 21 18 85 66 47 30.45 30.38 30.25 10 10 8 14 3 21 T Snow
25 45 38 30 31 24 19 85 65 45 30.35 30.12 29.94 10 10 10 20 6 25 0.00  
26 43 35 26 32 26 23 89 69 49 30.28 30.20 30.00 10 10 10 20 6 29 T  
27 43 35 26 39 34 23 100 80 59 30.14 29.58 29.34 10 7 2 18 7 31 0.62 Rain
28 42 34 25 34 21 11 82 64 46 29.96 29.69 29.43 10 10 10 30 15 39 T Rain
29 32 26 19 28 17 10 85 68 50 30.07 29.98 29.93 10 9 4 14 6 20 0.01 Snow
30 40 36 32 32 30 28 89 80 70 30.01 29.94 29.84 10 8 6 13 5 17 T Rain
31 45 38 30 39 36 31 96 86 76 30.10 29.93 29.81 10 9 3 14 4 18 0.01 Rain