Weather History for Palo Alto, CA

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Month of September, 2011

  Max Avg Min Sum
Temperature  
Max Temperature 89 °F 77 °F 68 °F
Mean Temperature 74 °F 67 °F 62 °F
Min Temperature 62 °F 56 °F 50 °F
Degree Days  
Heating Degree Days (base 65) 3 1 0 18
Cooling Degree Days (base 65) 8 2 0 66
Growing Degree Days (base 50) 24 17 12 500
Dew Point  
Dew Point 68 °F 58 °F 46 °F
Precipitation  
Precipitation 0.00 in 0.00 in 0.00 in 0.00 in
Snowdepth - - - -
Wind  
Wind 21 mph 8 mph 0 mph
Gust Wind 25 mph 21 mph 15 mph
Sea Level Pressure  
Sea Level Pressure 30.09 in 29.94 in 29.72 in

Monthly Weather History Graph

Monthly Weather History Graph

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Date:

Astronomy

Sep. 12, 2011 Rise Set
Actual Time 6:47 AM PDT 7:21 PM PDT
Civil Twilight 6:21 AM PDT 7:47 PM PDT
Nautical Twilight 5:50 AM PDT 8:18 PM PDT
Astronomical Twilight 5:18 AM PDT 8:49 PM PDT
Moon 7:14 PM PDT (9/12) 7:07 AM PDT (9/12)
Length of Visible Light 13h 25m
Length of Day
12h 33m
Full, 100% of the Moon is Illuminated
Sep 12
Full
Sep 20
Last Quarter
Sep 27
New
Oct 3
First Quarter
Oct 11
Full

Weather History Calendar

Precipitation Actual month total 0.00 Average Month Total: 0.17
Sunday Monday Tuesday Wednesday Thursday Friday Saturday
 
Scattered Clouds
Actual:
75 | 51 0.00
Average:
78 | 53 0.00
Clear
Actual:
80 | 53 0.00
Average:
79 | 53 0.00
Partly Cloudy
Actual:
73 | 60 0.00
Average:
79 | 53 0.00
Partly Cloudy
Actual:
69 | 60 0.00
Average:
78 | 54 0.00
Scattered Clouds
Actual:
69 | 57 0.00
Average:
80 | 54 0.00
Scattered Clouds
Actual:
78 | 57 0.00
Average:
78 | 54 0.00
Clear
Actual:
86 | 53 0.00
Average:
79 | 54 0.00
Partly Cloudy
Actual:
71 | 53 0.00
Average:
80 | 53 0.00
Rain
Actual:
73 | 59 0.00
Average:
79 | 53 0.00
Clear
Actual:
75 | 60 0.00
Average:
77 | 53 0.00
Partly Cloudy
Actual:
75 | 62 0.00
Average:
78 | 52 0.00
Partly Cloudy
Actual:
73 | 62 0.00
Average:
78 | 52 0.00
Scattered Clouds
Actual:
75 | 60 0.00
Average:
78 | 52 0.00
Partly Cloudy
Actual:
68 | 59 0.00
Average:
77 | 52 0.01
Scattered Clouds
Actual:
71 | 53 0.00
Average:
76 | 52 0.01
Scattered Clouds
Actual:
73 | 51 0.00
Average:
76 | 52 0.01
Scattered Clouds
Actual:
75 | 50 0.00
Average:
76 | 53 0.01
Clear
Actual:
82 | 50 0.00
Average:
76 | 53 0.01
Clear
Actual:
87 | 55 0.00
Average:
76 | 52 0.01
Clear
Actual:
86 | 57 0.00
Average:
76 | 50 0.01
Clear
Actual:
84 | 53 0.00
Average:
78 | 50 0.01
Partly Cloudy
Actual:
80 | 60 0.00
Average:
78 | 51 0.01
Scattered Clouds
Actual:
84 | 55 0.00
Average:
77 | 51 0.01
Partly Cloudy
Actual:
87 | 60 0.00
Average:
77 | 51 0.01
Partly Cloudy
Actual:
69 | 60 0.00
Average:
79 | 52 0.01
Clear
Actual:
77 | 51 0.00
Average:
77 | 52 0.01
Scattered Clouds
Actual:
78 | 53 0.00
Average:
77 | 52 0.01
Scattered Clouds
Actual:
89 | 55 0.00
Average:
77 | 52 0.01
Partly Cloudy
Actual:
73 | 60 0.00
Average:
77 | 52 0.01
Partly Cloudy
Actual:
75 | 59 0.00
Average:
78 | 51 0.01
 

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
Sep high avg low high avg low high avg low high avg low high avg low high avg high sum  
1 75 63 51 59 57 50 94 73 57 29.87 29.84 29.81 15 12 7 17 7 17 0.00  
2 80 66 53 63 59 52 94 71 51 29.89 29.85 29.82 20 14 10 17 9 - 0.00  
3 73 66 60 59 59 57 94 79 61 29.91 29.89 29.86 20 9 5 17 10 - 0.00  
4 69 64 60 59 58 57 88 80 64 29.94 29.90 29.87 20 10 4 17 9 - 0.00  
5 69 63 57 57 55 54 88 74 60 29.96 29.93 29.90 10 10 8 17 10 15 0.00  
6 78 68 57 61 57 55 94 72 44 30.00 29.97 29.91 20 10 5 13 8 - 0.00  
7 86 70 53 63 57 52 94 64 31 30.02 29.98 29.95 - - - 15 7 - 0.00  
8 71 62 53 57 55 52 94 77 57 30.09 30.04 29.98 15 11 10 18 8 - 0.00  
9 73 66 59 61 58 55 88 76 61 29.91 29.83 29.73 20 11 7 15 8 - 0.00 Rain
10 75 68 60 64 61 57 88 75 61 29.80 29.78 29.72 20 16 10 18 12 23 0.00  
11 75 68 62 61 60 59 88 73 61 30.02 29.97 29.92 20 12 7 17 10 23 0.00  
12 73 68 62 61 59 55 88 74 61 30.09 30.06 30.02 15 14 12 17 9 23 0.00  
13 75 68 60 63 60 57 88 76 61 30.07 30.02 29.96 15 9 8 16 8 - 0.00  
14 68 64 59 59 57 54 94 81 68 29.97 29.94 29.88 15 9 7 20 9 23 0.00  
15 71 62 53 57 54 52 94 72 50 29.93 29.89 29.80 15 8 5 21 9 23 0.00  
16 73 62 51 57 52 50 94 66 47 29.97 29.94 29.89 20 19 13 18 9 17 0.00  
17 75 62 50 59 54 48 94 68 57 30.06 30.01 29.90 20 19 15 17 10 - 0.00  
18 82 66 50 57 55 48 94 60 42 30.09 30.03 29.96 - - - 14 7 - 0.00  
19 87 71 55 64 59 52 88 62 35 30.00 29.94 29.88 - - - 14 7 - 0.00  
20 86 72 57 64 61 54 94 66 40 29.94 29.89 29.83 20 20 20 17 7 - 0.00  
21 84 68 53 64 60 52 94 68 45 29.90 29.88 29.85 20 20 20 15 8 18 0.00  
22 80 70 60 63 59 50 94 75 34 29.97 29.94 29.90 20 9 6 12 6 - 0.00  
23 84 70 55 66 60 55 100 70 40 29.98 29.93 29.87 20 20 20 17 6 - 0.00  
24 87 74 60 61 58 54 88 73 40 29.98 29.95 29.91 20 20 20 17 11 25 0.00  
25 69 64 60 61 57 55 82 74 64 30.04 30.02 29.99 20 20 20 12 7 - 0.00  
26 77 64 51 59 54 46 94 65 50 30.08 30.03 29.97 20 20 20 17 9 23 0.00  
27 78 66 53 63 58 50 88 67 47 30.05 29.99 29.93 20 20 20 12 6 - 0.00  
28 89 72 55 68 60 52 88 61 36 29.98 29.92 29.88 - - - 15 6 - 0.00  
29 73 66 60 64 62 57 94 79 65 29.93 29.90 29.88 20 16 15 18 10 23 0.00  
30 75 67 59 61 58 55 94 73 57 29.97 29.93 29.87 20 12 10 13 6 - 0.00