Weather History for Mount Vernon, IL

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Month of December, 2011

  Max Avg Min Sum
Temperature  
Max Temperature 60 °F 45 °F 28 °F
Mean Temperature 55 °F 39 °F 25 °F
Min Temperature 51 °F 32 °F 15 °F
Degree Days  
Heating Degree Days (base 65) 40 26 10 821
Cooling Degree Days (base 65) 0 0 0 0
Growing Degree Days (base 50) 5 0 0 9
Dew Point  
Dew Point 57 °F 32 °F 12 °F
Precipitation  
Precipitation 0.86 in 0.07 in 0.00 in 2.26 in
Snowdepth - - - -
Wind  
Wind 26 mph 5 mph 0 mph
Gust Wind 37 mph 20 mph 16 mph
Sea Level Pressure  
Sea Level Pressure 30.64 in 30.19 in 29.61 in

Monthly Weather History Graph

Monthly Weather History Graph

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Date:

Astronomy

Dec. 09, 2011 Rise Set
Actual Time 7:00 AM CST 4:34 PM CST
Civil Twilight 6:30 AM CST 5:04 PM CST
Nautical Twilight 5:57 AM CST 5:37 PM CST
Astronomical Twilight 5:25 AM CST 6:09 PM CST
Moon 3:58 PM CST (12/9) 6:07 AM CST (12/9)
Length of Visible Light 10h 33m
Length of Day
9h 34m
Waxing Gibbous, 99% of the Moon is Illuminated
Dec 9
Waxing Gibbous
Dec 10
Full
Dec 17
Last Quarter
Dec 24
New
Jan 1
First Quarter

Weather History Calendar

Precipitation Actual month total 2.26 Average Month Total: 5.34
Sunday Monday Tuesday Wednesday Thursday Friday Saturday
 
Clear
Actual:
48 | 21 0.00
Average:
47 | 31 0.11
Partly Cloudy
Actual:
50 | 37 0.00
Average:
47 | 31 0.11
Partly Cloudy
Actual:
59 | 51 0.00
Average:
46 | 30 0.11
Overcast
Actual:
53 | 42 0.45
Average:
46 | 30 0.11
Overcast
Actual:
37 | 33 0.65
Average:
45 | 30 0.12
Overcast
Actual:
37 | 35 0.00
Average:
45 | 29 0.12
Partly Cloudy
Actual:
35 | 26 0.00
Average:
44 | 29 0.12
Scattered Clouds
Actual:
28 | 24 0.00
Average:
44 | 29 0.12
Partly Cloudy
Actual:
37 | 23 0.00
Average:
43 | 28 0.12
Clear
Actual:
35 | 15 0.00
Average:
43 | 28 0.12
Clear
Actual:
42 | 19 0.00
Average:
42 | 27 0.11
Scattered Clouds
Actual:
51 | 21 0.00
Average:
42 | 27 0.11
Overcast
Actual:
46 | 37 0.00
Average:
41 | 26 0.11
Overcast
Actual:
59 | 46 0.86
Average:
41 | 26 0.11
Partly Cloudy
Actual:
60 | 35 0.13
Average:
40 | 25 0.10
Clear
Actual:
39 | 24 0.00
Average:
39 | 24 0.10
Clear
Actual:
35 | 21 0.00
Average:
38 | 24 0.10
Scattered Clouds
Actual:
50 | 24 0.00
Average:
38 | 23 0.10
Overcast
Actual:
48 | 46 0.11
Average:
37 | 23 0.10
Overcast
Actual:
48 | 44 0.06
Average:
36 | 22 0.09
Overcast
Actual:
48 | 46 0.00
Average:
36 | 22 0.09
Overcast
Actual:
46 | 44 0.00
Average:
36 | 22 0.09
Partly Cloudy
Actual:
39 | 28 0.00
Average:
36 | 22 0.10
Clear
Actual:
41 | 24 0.00
Average:
36 | 22 0.10
Clear
Actual:
53 | 26 0.00
Average:
36 | 22 0.10
Partly Cloudy
Actual:
42 | 21 0.00
Average:
37 | 23 0.10
Mostly Cloudy
Actual:
42 | 30 0.00
Average:
37 | 23 0.11
Clear
Actual:
37 | 26 0.00
Average:
37 | 23 0.11
Scattered Clouds
Actual:
53 | 35 0.00
Average:
37 | 23 0.11
Mostly Cloudy
Actual:
57 | 46 0.00
Average:
37 | 23 2.12
Scattered Clouds
Actual:
55 | 30 0.00
Average:
37 | 23 0.12
 

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 48 34 21 34 26 19 93 76 57 30.36 30.29 30.22 10 10 6 9 2 - 0.00  
2 50 44 37 36 35 30 81 65 58 30.45 30.41 30.37 10 10 9 9 5 - 0.00  
3 59 55 51 41 38 37 58 54 48 30.37 30.26 30.11 10 10 10 16 7 23 0.00  
4 53 48 42 52 45 39 94 89 87 30.19 30.10 30.02 10 9 2 21 12 30 0.45  
5 37 35 33 36 32 30 100 91 81 30.24 30.19 30.14 10 6 2 10 7 21 0.65  
6 37 36 35 34 33 30 93 86 75 30.22 30.18 30.14 10 9 5 10 6 - 0.00  
7 35 30 26 30 27 21 93 78 60 30.22 30.15 30.08 10 10 7 9 4 16 0.00  
8 28 26 24 27 22 21 93 88 80 30.29 30.25 30.23 10 10 10 5 1 - 0.00  
9 37 30 23 34 25 18 100 77 65 30.52 30.39 30.21 10 10 6 7 2 - 0.00  
10 35 25 15 19 17 12 93 73 52 30.64 30.57 30.52 10 10 10 8 1 - 0.00  
11 42 30 19 27 21 16 100 73 46 30.56 30.51 30.43 10 10 10 10 2 - 0.00  
12 51 36 21 34 25 18 93 76 50 30.45 30.41 30.37 10 10 10 7 1 - 0.00  
13 46 42 37 45 40 34 100 91 81 30.47 30.40 30.33 10 7 2 12 2 - 0.00  
14 59 52 46 55 50 45 100 92 82 30.26 30.08 29.90 10 8 4 23 12 33 0.86  
15 60 48 35 57 44 25 94 79 65 30.35 30.07 29.86 10 10 10 20 13 28 0.13  
16 39 32 24 28 26 21 93 75 60 30.42 30.37 30.32 10 10 6 8 2 - 0.00  
17 35 28 21 30 22 19 100 90 75 30.41 30.38 30.36 10 6 4 14 1 - 0.00  
18 50 37 24 37 30 21 100 81 62 30.32 30.22 30.08 10 10 8 14 4 21 0.00  
19 48 47 46 39 38 37 76 72 66 30.12 30.08 30.05 10 10 5 16 12 21 0.11  
20 48 46 44 46 45 43 93 92 87 29.93 29.81 29.74 10 3 0 8 4 - 0.06  
21 48 47 46 46 46 45 100 94 93 30.01 29.86 29.69 10 8 0 12 3 18 0.00  
22 46 45 44 39 39 37 81 79 76 30.24 30.09 29.99 10 10 6 6 2 - 0.00  
23 39 34 28 34 30 25 93 83 70 30.42 30.35 30.26 10 9 4 13 5 - 0.00  
24 41 32 24 28 26 21 100 83 61 30.45 30.39 30.33 10 10 5 14 6 - 0.00  
25 53 40 26 34 27 21 93 70 35 30.39 30.33 30.27 10 10 10 13 5 21 0.00  
26 42 32 21 34 27 18 100 80 61 30.37 30.21 29.90 10 10 5 10 2 - 0.00  
27 42 36 30 36 31 27 100 85 61 30.08 29.84 29.70 10 8 1 12 4 23 0.00  
28 37 32 26 30 27 21 93 82 70 30.15 30.07 29.94 10 10 5 12 3 - 0.00  
29 53 44 35 39 33 30 87 74 54 29.93 29.82 29.74 10 10 10 21 11 26 0.00  
30 57 52 46 45 37 34 76 56 44 29.90 29.72 29.61 10 10 10 26 13 37 0.00  
31 55 42 30 39 35 28 100 71 51 30.08 29.96 29.78 10 10 5 15 5 22 0.00