Weather History for Gaithersburg, MD

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Saturday, August 20, 2011

  Actual Average (KCGS) Record (KCGS)
Temperature  
Mean Temperature 74 °F -  
Max Temperature 87 °F 85 °F 100 °F (1962)
Min Temperature 60 °F 65 °F 50 °F (1964)
Cooling Degree Days 8    
Growing Degree Days 24 (Base 50)    
Moisture  
Dew Point 63 °F    
Average Humidity 69    
Maximum Humidity 100    
Minimum Humidity 40    
Precipitation  
Precipitation 0.00 in - - ()
Sea Level Pressure  
Sea Level Pressure 30.01 in    
Wind  
Wind Speed 2 mph (SW)    
Max Wind Speed 8 mph    
Max Gust Speed -    
Visibility 9 miles    
Events      
Averages and records for this station are not official NWS values.
T = Trace of Precipitation, MM = Missing Value Source: NWS Daily Summary

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Astronomy

Aug. 20, 2011 Rise Set
Actual Time 6:26 AM EDT 7:57 PM EDT
Civil Twilight 5:57 AM EDT 8:25 PM EDT
Nautical Twilight 5:23 AM EDT 8:59 PM EDT
Astronomical Twilight 4:47 AM EDT 9:35 PM EDT
Moon 11:07 PM EDT (8/20) 1:00 PM EDT (8/20)
Length of Visible Light 14h 27m
Length of Day
13h 31m
Waning Gibbous, 62% of the Moon is Illuminated
Aug 20
Waning Gibbous
Aug 21
Last Quarter
Aug 28
New
Sep 4
First Quarter
Sep 12
Full

Hourly Weather History & Observations

Time (EDT) Temp. Heat Index Dew Point Humidity Pressure Visibility Wind Dir Wind Speed Gust Speed Precip Events Conditions
12:35 AM 66.2 °F - 62.6 °F 88% 29.99 in 10.0 mi Calm Calm - N/A   Clear
1:15 AM 66.2 °F - 62.6 °F 88% 29.99 in 10.0 mi SSE 4.6 mph - N/A   Clear
1:35 AM 64.4 °F - 62.6 °F 94% 29.98 in 10.0 mi Calm Calm - N/A   Clear
2:15 AM 64.4 °F - 62.6 °F 94% 29.98 in 10.0 mi Calm Calm - N/A   Clear
2:35 AM 62.6 °F - 62.6 °F 100% 29.98 in 10.0 mi Calm Calm - N/A   Clear
2:55 AM 62.6 °F - 62.6 °F 100% 29.98 in 10.0 mi Calm Calm - N/A   Clear
3:15 AM 62.6 °F - 60.8 °F 94% 29.98 in 9.0 mi Calm Calm - N/A   Clear
3:35 AM 62.6 °F - 60.8 °F 94% 29.98 in 5.0 mi Calm Calm - N/A   Clear
4:15 AM 62.6 °F - 60.8 °F 94% 29.98 in 6.0 mi Calm Calm - N/A   Clear
4:35 AM 62.6 °F - 60.8 °F 94% 29.98 in 7.0 mi Calm Calm - N/A   Clear
4:55 AM 60.8 °F - 60.8 °F 100% 29.98 in 5.0 mi Calm Calm - N/A   Clear
5:15 AM 62.6 °F - 60.8 °F 94% 29.98 in 7.0 mi Calm Calm - N/A   Clear
5:55 AM 60.8 °F - 60.8 °F 100% 30.00 in 5.0 mi Calm Calm - N/A   Clear
6:15 AM 60.8 °F - 60.8 °F 100% 30.01 in 7.0 mi Calm Calm - N/A   Clear
6:35 AM 62.6 °F - 60.8 °F 94% 30.03 in 2.0 mi Calm Calm - N/A   Clear
6:55 AM 62.6 °F - 60.8 °F 94% 30.03 in 6.0 mi Calm Calm - N/A   Clear
7:15 AM 62.6 °F - 62.6 °F 100% 30.03 in 5.0 mi Calm Calm - N/A   Clear
7:35 AM 64.4 °F - 62.6 °F 94% 30.04 in 9.0 mi Calm Calm - N/A   Clear
7:55 AM 66.2 °F - 62.6 °F 88% 30.04 in 10.0 mi Calm Calm - N/A   Clear
8:35 AM 69.8 °F - 64.4 °F 83% 30.05 in 10.0 mi Calm Calm - N/A   Clear
8:55 AM 69.8 °F - 64.4 °F 83% 30.05 in 10.0 mi WNW 3.5 mph - N/A   Clear
9:15 AM 71.6 °F - 64.4 °F 78% 30.05 in 10.0 mi NW 3.5 mph - N/A   Clear
9:35 AM 73.4 °F - 64.4 °F 73% 30.05 in 10.0 mi NW 4.6 mph - N/A   Clear
9:55 AM 73.4 °F - 64.4 °F 73% 30.05 in 10.0 mi WNW 5.8 mph - N/A   Clear
10:15 AM 75.2 °F - 64.4 °F 69% 30.06 in 10.0 mi WNW 4.6 mph - N/A   Clear
10:35 AM 77.0 °F - 66.2 °F 69% 30.05 in 10.0 mi WNW 3.5 mph - N/A   Clear
10:55 AM 78.8 °F - 66.2 °F 65% 30.04 in 10.0 mi SSW 3.5 mph - N/A   Clear
11:15 AM 78.8 °F - 64.4 °F 61% 30.04 in 10.0 mi Calm Calm - N/A   Clear
11:35 AM 80.6 °F 82.3 °F 64.4 °F 58% 30.04 in 10.0 mi Calm Calm - N/A   Clear
11:55 AM 80.6 °F 82.3 °F 64.4 °F 58% 30.03 in 10.0 mi Calm Calm - N/A   Clear
12:15 PM 82.4 °F 84.6 °F 66.2 °F 58% 30.03 in 8.0 mi Calm Calm - N/A   Clear
12:35 PM 82.4 °F 83.9 °F 64.4 °F 54% 30.04 in 8.0 mi Calm Calm - N/A   Clear
12:55 PM 82.4 °F 83.9 °F 64.4 °F 54% 30.04 in 10.0 mi Calm Calm - N/A   Clear
1:15 PM 82.4 °F 83.9 °F 64.4 °F 54% 30.03 in 10.0 mi WSW 4.6 mph - N/A   Clear
1:35 PM 84.2 °F 85.6 °F 64.4 °F 51% 30.02 in 9.0 mi WNW 5.8 mph - N/A   Clear
1:55 PM 84.2 °F 85.6 °F 64.4 °F 51% 30.02 in 10.0 mi NW 3.5 mph - N/A   Clear
2:15 PM 84.2 °F 85.6 °F 64.4 °F 51% 30.02 in 10.0 mi WSW 5.8 mph - N/A   Clear
2:35 PM 84.2 °F 85.6 °F 64.4 °F 51% 30.02 in 7.0 mi West 4.6 mph - N/A   Clear
2:55 PM 86.0 °F 86.6 °F 62.6 °F 45% 30.01 in 10.0 mi South 3.5 mph - N/A   Clear
3:15 PM 86.0 °F 86.6 °F 62.6 °F 45% 30.01 in 10.0 mi South 8.1 mph - N/A   Clear
3:35 PM 87.8 °F 87.6 °F 60.8 °F 40% 30.00 in 10.0 mi SSW 4.6 mph - N/A   Clear
3:55 PM 87.8 °F 88.5 °F 62.6 °F 43% 30.01 in 10.0 mi South 3.5 mph - N/A   Clear
4:15 PM 87.8 °F 88.5 °F 62.6 °F 43% 30.00 in 10.0 mi Calm Calm - N/A   Clear
4:35 PM 86.0 °F 86.6 °F 62.6 °F 45% 29.99 in 10.0 mi SSW 3.5 mph - N/A   Partly Cloudy
4:55 PM 87.8 °F 88.5 °F 62.6 °F 43% 29.99 in 10.0 mi Calm Calm - N/A   Partly Cloudy
5:15 PM 87.8 °F 88.5 °F 62.6 °F 43% 29.99 in 10.0 mi Calm Calm - N/A   Partly Cloudy
5:35 PM 87.8 °F 87.6 °F 60.8 °F 40% 29.99 in 10.0 mi SSW 3.5 mph - N/A   Clear
5:55 PM 86.0 °F 85.4 °F 59.0 °F 40% 29.99 in 10.0 mi SSE 4.6 mph - N/A   Clear
6:15 PM 87.8 °F 87.6 °F 60.8 °F 40% 29.99 in 10.0 mi SSE 3.5 mph - N/A   Clear
6:35 PM 86.0 °F 86.1 °F 60.8 °F 43% 29.99 in 10.0 mi South 4.6 mph - N/A   Clear
6:55 PM 82.4 °F 83.4 °F 62.6 °F 51% 29.99 in 10.0 mi South 3.5 mph - N/A   Clear
7:15 PM 82.4 °F 83.4 °F 62.6 °F 51% 29.99 in 10.0 mi South 3.5 mph - N/A   Clear
7:35 PM 82.4 °F 83.4 °F 62.6 °F 51% 29.99 in 10.0 mi South 4.6 mph - N/A   Clear
8:15 PM 78.8 °F - 62.6 °F 57% 30.00 in 10.0 mi South 3.5 mph - N/A   Clear
8:35 PM 78.8 °F - 62.6 °F 57% 30.01 in 10.0 mi SSE 4.6 mph - N/A   Clear
8:55 PM 78.8 °F - 64.4 °F 61% 30.01 in 10.0 mi SE 3.5 mph - N/A   Clear
9:15 PM 75.2 °F - 64.4 °F 69% 30.01 in 10.0 mi SSE 5.8 mph - N/A   Clear
9:35 PM 77.0 °F - 66.2 °F 69% 30.02 in 10.0 mi SSE 4.6 mph - N/A   Clear
9:55 PM 78.8 °F - 66.2 °F 65% 30.02 in 10.0 mi South 6.9 mph - N/A   Clear
10:15 PM 77.0 °F - 66.2 °F 69% 30.03 in 10.0 mi SSE 6.9 mph - N/A   Clear
10:35 PM 77.0 °F - 66.2 °F 69% 30.03 in 10.0 mi South 6.9 mph - N/A   Clear
10:55 PM 75.2 °F - 66.2 °F 73% 30.03 in 10.0 mi SSE 8.1 mph - N/A   Clear
11:15 PM 75.2 °F - 66.2 °F 73% 30.03 in 10.0 mi South 5.8 mph - N/A   Clear
11:35 PM 75.2 °F - 66.2 °F 73% 30.03 in 10.0 mi SSE 6.9 mph - N/A   Clear
11:55 PM 75.2 °F - 68.0 °F 78% 30.02 in 10.0 mi SSE 6.9 mph - N/A   Clear