Weather History for Mount Vernon, IL

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Month of December, 2012

  Max Avg Min Sum
Temperature  
Max Temperature 69 °F 48 °F 32 °F
Mean Temperature 64 °F 39 °F 19 °F
Min Temperature 59 °F 30 °F 5 °F
Degree Days  
Heating Degree Days (base 65) 46 26 1 797
Cooling Degree Days (base 65) 0 0 0 0
Growing Degree Days (base 50) 14 1 0 26
Dew Point  
Dew Point 59 °F 33 °F 0 °F
Precipitation  
Precipitation 0.52 in 0.04 in 0.00 in 1.13 in
Snowdepth - - - -
Wind  
Wind 33 mph 6 mph 0 mph
Gust Wind 48 mph 21 mph 16 mph
Sea Level Pressure  
Sea Level Pressure 30.49 in 30.04 in 29.29 in

Monthly Weather History Graph

Monthly Weather History Graph

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Date:

Astronomy

Dec. 10, 2012 Rise Set
Actual Time 7:01 AM CST 4:35 PM CST
Civil Twilight 6:32 AM CST 5:04 PM CST
Nautical Twilight 5:59 AM CST 5:37 PM CST
Astronomical Twilight 5:27 AM CST 6:09 PM CST
Moon 3:46 AM CST (12/10) 2:22 PM CST (12/10)
Length of Visible Light 10h 32m
Length of Day
9h 33m
Waning Crescent, 10% of the Moon is Illuminated
Dec 10
Waning Crescent
Dec 13
New
Dec 19
First Quarter
Dec 28
Full
Jan 4
Last Quarter

Weather History Calendar

Precipitation Actual month total 1.13 Average Month Total: 5.34
Sunday Monday Tuesday Wednesday Thursday Friday Saturday
 
Partly Cloudy
Actual:
66 | 37 0.00
Average:
47 | 31 0.11
Mostly Cloudy
Actual:
64 | 57 0.00
Average:
47 | 31 0.11
Partly Cloudy
Actual:
69 | 59 0.00
Average:
46 | 30 0.11
Clear
Actual:
62 | 33 0.04
Average:
46 | 30 0.11
Clear
Actual:
55 | 28 0.00
Average:
45 | 30 0.12
Partly Cloudy
Actual:
51 | 33 0.00
Average:
45 | 29 0.12
Mostly Cloudy
Actual:
59 | 42 0.05
Average:
44 | 29 0.12
Clear
Actual:
51 | 44 0.04
Average:
44 | 29 0.12
Thunderstorm
Actual:
55 | 44 0.06
Average:
43 | 28 0.12
Overcast
Actual:
42 | 30 0.03
Average:
43 | 28 0.12
Scattered Clouds
Actual:
39 | 21 0.00
Average:
42 | 27 0.11
Clear
Actual:
48 | 17 0.00
Average:
42 | 27 0.11
Clear
Actual:
51 | 17 0.00
Average:
41 | 26 0.11
Scattered Clouds
Actual:
53 | 23 0.00
Average:
41 | 26 0.11
Mostly Cloudy
Actual:
57 | 44 0.20
Average:
40 | 25 0.10
Scattered Clouds
Actual:
51 | 32 0.00
Average:
39 | 24 0.10
Thunderstorm
Actual:
42 | 39 0.00
Average:
38 | 24 0.10
Scattered Clouds
Actual:
53 | 30 0.01
Average:
38 | 23 0.10
Partly Cloudy
Actual:
55 | 26 0.00
Average:
37 | 23 0.10
Thunderstorm
Actual:
57 | 28 0.52
Average:
36 | 22 0.09
Scattered Clouds
Actual:
35 | 26 0.00
Average:
36 | 22 0.09
Clear
Actual:
44 | 17 0.00
Average:
36 | 22 0.09
Scattered Clouds
Actual:
57 | 32 0.00
Average:
36 | 22 0.10
Overcast
Actual:
42 | 26 0.00
Average:
36 | 22 0.10
Mostly Cloudy
Actual:
35 | 24 0.00
Average:
36 | 22 0.10
Overcast
Actual:
33 | 28 0.02
Average:
37 | 23 0.10
Overcast
Actual:
33 | 28 0.02
Average:
37 | 23 0.11
Mostly Cloudy
Actual:
35 | 28 0.00
Average:
37 | 23 0.11
Partly Cloudy
Actual:
32 | 8 0.00
Average:
37 | 23 0.11
Scattered Clouds
Actual:
33 | 5 0.00
Average:
37 | 23 2.12
Mostly Cloudy
Actual:
35 | 30 0.14
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

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 66 52 37 52 46 34 100 71 59 30.19 30.12 30.05 10 9 3 18 6 23 0.00  
2 64 60 57 57 54 48 94 77 59 30.09 30.06 30.02 10 9 5 23 15 31 0.00  
3 69 64 59 59 56 54 88 78 64 30.09 30.05 30.00 10 10 10 26 13 37 0.00  
4 62 48 33 57 45 30 94 81 58 30.31 30.15 30.00 10 10 1 14 7 17 0.04  
5 55 42 28 37 32 25 93 72 44 30.39 30.30 30.19 10 10 10 10 3 - 0.00  
6 51 42 33 43 36 28 93 77 62 30.18 30.06 29.97 10 10 10 7 4 - 0.00  
7 59 50 42 54 49 39 100 91 77 29.97 29.89 29.83 10 6 0 9 1 - 0.05  
8 51 48 44 48 44 39 100 86 76 30.01 29.95 29.86 10 7 1 13 3 18 0.04  
9 55 50 44 54 46 36 94 89 71 29.97 29.84 29.75 10 4 0 12 5 - 0.06 Thunderstorm
10 42 36 30 36 24 18 81 72 60 30.08 29.94 29.84 10 10 10 12 4 17 0.03  
11 39 30 21 23 20 16 86 67 48 30.26 30.16 30.08 10 10 10 14 4 17 0.00  
12 48 32 17 28 22 16 100 71 40 30.39 30.33 30.26 10 10 9 9 2 - 0.00  
13 51 34 17 28 23 14 93 65 35 30.39 30.32 30.24 10 10 10 14 4 17 0.00  
14 53 38 23 34 28 18 93 62 38 30.28 30.20 30.08 10 10 10 16 3 18 0.00  
15 57 50 44 52 45 32 93 81 57 30.05 29.82 29.69 10 10 7 24 10 34 0.20  
16 51 42 32 48 41 28 100 86 71 29.78 29.74 29.69 10 8 0 7 4 - 0.00  
17 42 40 39 39 38 32 93 87 75 29.82 29.72 29.65 10 4 1 12 5 17 0.00 Thunderstorm
18 53 42 30 39 35 25 87 73 54 29.92 29.82 29.73 10 10 3 22 7 29 0.01  
19 55 40 26 46 35 25 93 76 62 30.05 29.92 29.63 10 8 4 13 6 21 0.00  
20 57 44 28 54 35 19 94 75 57 29.90 29.55 29.29 10 9 2 33 14 48 0.52 Thunderstorm
21 35 30 26 19 16 12 69 57 44 30.29 30.14 29.90 10 10 10 18 10 31 0.00  
22 44 30 17 21 19 14 93 64 37 30.33 30.20 30.01 10 10 10 12 2 - 0.00  
23 57 44 32 34 30 23 81 61 38 30.00 29.94 29.86 10 10 5 10 5 - 0.00  
24 42 34 26 36 28 21 87 75 66 30.13 29.95 29.79 10 7 3 10 4 18 0.00  
25 35 30 24 27 23 18 86 73 60 30.23 30.11 29.88 10 8 2 22 8 31 0.00  
26 33 30 28 28 25 23 93 78 70 30.15 29.93 29.76 10 6 0 22 12 31 0.02  
27 33 30 28 25 22 19 86 73 60 30.23 30.17 30.11 10 10 10 8 3 - 0.02  
28 35 32 28 30 27 23 93 82 70 30.11 30.00 29.87 10 7 0 8 3 - 0.00  
29 32 21 8 28 21 3 93 81 64 30.37 30.13 29.87 10 6 2 10 1 18 0.00  
30 33 19 5 25 15 0 100 80 65 30.49 30.40 30.29 10 7 0 12 3 - 0.00  
31 35 32 30 32 29 25 93 83 70 30.29 30.18 30.08 10 6 1 15 8 - 0.14