Weather History for Alton, IL

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Month of December, 2011

  Max Avg Min Sum
Temperature  
Max Temperature 59 °F 46 °F 33 °F
Mean Temperature 51 °F 39 °F 26 °F
Min Temperature 45 °F 31 °F 16 °F
Degree Days  
Heating Degree Days (base 65) 40 26 14 819
Cooling Degree Days (base 65) 0 0 0 0
Growing Degree Days (base 50) 1 0 0 1
Dew Point  
Dew Point 58 °F 32 °F 0 °F
Precipitation  
Precipitation 0.19 in 0.02 in 0.00 in 0.69 in
Snowdepth - - - -
Wind  
Wind 25 mph 6 mph 0 mph
Gust Wind 38 mph 22 mph 16 mph
Sea Level Pressure  
Sea Level Pressure 30.61 in 30.17 in 29.56 in

Monthly Weather History Graph

Monthly Weather History Graph

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Date:

Astronomy

Dec. 06, 2011 Rise Set
Actual Time 7:04 AM CST 4:37 PM CST
Civil Twilight 6:34 AM CST 5:07 PM CST
Nautical Twilight 6:01 AM CST 5:40 PM CST
Astronomical Twilight 5:29 AM CST 6:13 PM CST
Moon 2:04 PM CST (12/6) 3:23 AM CST (12/6)
Length of Visible Light 10h 33m
Length of Day
9h 33m
Waxing Gibbous, 87% of the Moon is Illuminated
Dec 6
Waxing Gibbous
Dec 10
Full
Dec 17
Last Quarter
Dec 24
New
Jan 1
First Quarter

Weather History Calendar

Precipitation Actual month total 0.69 Average Month Total: 3.48
Sunday Monday Tuesday Wednesday Thursday Friday Saturday
 
Scattered Clouds
Actual:
48 | 26 0.00
Average:
47 | 33 0.13
Rain
Actual:
44 | 32 0.00
Average:
46 | 32 0.13
Rain
Actual:
59 | 43 0.06
Average:
46 | 32 0.12
Rain
Actual:
55 | 34 0.11
Average:
45 | 31 0.11
Rain
Actual:
33 | 32 0.00
Average:
45 | 31 0.11
Snow
Actual:
37 | 32 0.00
Average:
44 | 30 0.11
Snow
Actual:
37 | 30 0.00
Average:
44 | 30 0.11
Partly Cloudy
Actual:
41 | 27 0.00
Average:
43 | 29 0.10
Partly Cloudy
Actual:
37 | 23 0.00
Average:
43 | 29 0.10
Clear
Actual:
35 | 16 0.00
Average:
42 | 28 0.11
Clear
Actual:
44 | 22 0.00
Average:
42 | 28 0.11
Partly Cloudy
Actual:
48 | 23 0.00
Average:
41 | 27 0.11
Rain
Actual:
46 | 41 0.01
Average:
41 | 27 0.11
Thunderstorm
Actual:
59 | 42 0.01
Average:
40 | 26 0.11
Rain
Actual:
59 | 32 0.01
Average:
39 | 25 0.11
Scattered Clouds
Actual:
37 | 25 0.00
Average:
39 | 25 0.11
Scattered Clouds
Actual:
44 | 23 0.00
Average:
38 | 24 0.11
Partly Cloudy
Actual:
51 | 29 0.00
Average:
37 | 23 0.12
Rain
Actual:
51 | 45 0.08
Average:
37 | 23 0.13
Rain
Actual:
46 | 44 0.08
Average:
37 | 22 0.13
Rain
Actual:
45 | 37 0.00
Average:
37 | 22 0.12
Mostly Cloudy
Actual:
42 | 35 0.00
Average:
37 | 22 0.12
Partly Cloudy
Actual:
36 | 32 0.00
Average:
37 | 22 0.12
Clear
Actual:
44 | 25 0.00
Average:
37 | 22 0.12
Clear
Actual:
51 | 29 0.00
Average:
37 | 22 0.11
Rain
Actual:
39 | 23 0.13
Average:
37 | 22 0.10
Snow
Actual:
41 | 28 0.19
Average:
38 | 22 0.11
Scattered Clouds
Actual:
53 | 27 0.00
Average:
38 | 22 0.10
Rain
Actual:
57 | 35 0.00
Average:
38 | 23 0.10
Rain
Actual:
53 | 41 0.01
Average:
38 | 23 0.10
Clear
Actual:
55 | 32 0.00
Average:
38 | 23 0.10
 

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 37 26 32 29 25 94 80 46 30.31 30.25 30.18 10 10 10 12 5 - 0.00  
2 44 38 32 39 34 30 93 80 70 30.47 30.37 30.31 10 9 5 12 5 - 0.00 Rain
3 59 51 43 47 40 37 87 71 48 30.33 30.16 29.99 10 10 7 21 10 25 0.06 Rain
4 55 44 34 54 42 31 95 90 81 30.27 30.10 29.93 10 10 7 18 12 25 0.11 Rain
5 33 32 32 31 28 27 92 85 80 30.29 30.26 30.22 10 10 7 18 10 23 0.00 Rain
6 37 34 32 34 31 29 100 92 75 30.26 30.21 30.16 10 6 4 16 9 18 0.00 Snow
7 37 34 30 31 24 15 96 75 41 30.22 30.17 30.13 10 8 4 15 7 - 0.00 Snow
8 41 34 27 31 24 19 87 70 49 30.29 30.22 30.18 10 10 10 9 4 - 0.00  
9 37 30 23 32 25 15 94 78 48 30.52 30.35 30.19 10 9 5 12 4 - 0.00  
10 35 26 16 21 17 0 93 76 23 30.61 30.52 30.49 10 10 7 9 2 - 0.00  
11 44 33 22 28 23 19 90 79 49 30.49 30.44 30.38 10 10 10 12 5 - 0.00  
12 48 36 23 33 26 22 93 71 37 30.42 30.38 30.34 10 10 10 12 4 - 0.00  
13 46 43 41 46 40 32 100 89 63 30.43 30.34 30.22 10 7 2 12 4 - 0.01 Rain
14 59 50 42 56 50 43 100 96 77 30.21 30.02 29.83 10 6 0 21 8 24 0.01 Fog , Rain , Thunderstorm
15 59 46 32 58 45 28 96 89 75 30.35 30.01 29.80 10 10 7 25 13 24 0.01 Rain
16 37 31 25 29 26 24 97 83 65 30.45 30.37 30.33 10 10 7 12 3 - 0.00  
17 44 34 23 32 27 23 99 89 57 30.38 30.33 30.26 10 9 7 16 2 - 0.00  
18 51 40 29 36 31 27 94 73 47 30.30 30.18 30.01 10 10 10 21 5 16 0.00  
19 51 48 45 46 40 32 99 75 52 30.14 30.05 30.00 10 8 2 17 9 17 0.08 Rain
20 46 45 44 46 45 44 100 99 93 30.12 29.93 29.73 7 3 0 14 4 - 0.08 Fog , Rain
21 45 41 37 46 42 36 100 94 81 30.00 29.84 29.69 10 6 0 18 4 - 0.00 Fog , Rain
22 42 38 35 38 36 33 100 92 81 30.30 30.11 30.01 10 9 2 12 4 - 0.00  
23 36 34 32 33 29 26 91 83 70 30.43 30.35 30.30 10 10 10 12 7 - 0.00  
24 44 34 25 28 25 24 93 75 46 30.41 30.35 30.32 10 10 10 12 5 - 0.00  
25 51 40 29 30 26 25 90 72 38 30.39 30.33 30.28 10 10 10 16 6 23 0.00  
26 39 31 23 36 29 23 100 91 65 30.36 30.19 29.89 10 8 2 14 3 - 0.13 Rain
27 41 34 28 36 32 27 100 92 70 30.09 29.89 29.73 10 6 1 23 6 32 0.19 Rain , Snow
28 53 40 27 32 29 25 95 82 35 30.12 30.03 29.88 10 10 10 14 6 - 0.00  
29 57 46 35 38 34 32 87 66 41 29.88 29.77 29.70 10 10 10 18 9 - 0.00 Rain
30 53 47 41 44 40 34 91 75 50 29.92 29.72 29.56 10 10 10 24 13 38 0.01 Rain
31 55 44 32 39 35 32 100 73 41 30.01 29.88 29.69 10 9 1 23 8 26 0.00