Weather History for KSFO - January, 1998

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Wednesday, January 7, 1998

  Actual Average Record
Temperature  
Mean Temperature 49 °F 50 °F  
Max Temperature 50 °F 56 °F 65 °F (2003)
Min Temperature 48 °F 44 °F 31 °F (1973)
Degree Days  
Heating Degree Days 16 15  
Month to date heating degree days 105  
Since 1 July heating degree days 1115  
Cooling Degree Days 0 0  
Month to date cooling degree days 0  
Year to date cooling degree days 0  
Moisture  
Dew Point 47 °F    
Average Humidity 96    
Maximum Humidity 100    
Minimum Humidity 89    
Precipitation  
Precipitation 0.10 in 0.14 in 0.87 in (1956)
Month to date precipitation 0.96  
Year to date precipitation 0.96  
Since 1 July precipitation 8.53  
Sea Level Pressure  
Sea Level Pressure 30.14 in    
Wind  
Wind Speed 9 mph (ENE)    
Max Wind Speed 17 mph    
Max Gust Speed -    
Visibility 8 miles    
Events Rain    
T = Trace of Precipitation, MM = Missing Value Source: NWS Daily Summary

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Date:

Astronomy

Jan. 07, 1998 Rise Set
Actual Time 7:24 AM PST 5:07 PM PST
Civil Twilight 6:55 AM PST 5:36 PM PST
Nautical Twilight 6:23 AM PST 6:08 PM PST
Astronomical Twilight 5:51 AM PST 6:40 PM PST
Moon 1:26 PM PST (1/7) 2:13 AM PST (1/7)
Length of Visible Light 10h 40m
Length of Day
9h 42m
Waxing Gibbous, 74% of the Moon is Illuminated
Jan 7
Waxing Gibbous
Jan 12
Full
Jan 20
Last Quarter
Jan 27
New
Feb 3
First Quarter

Hourly Weather History & Observations

Time (PST) Temp. Dew Point Humidity Pressure Visibility Wind Dir Wind Speed Gust Speed Precip Events Conditions
12:21 AM 48.2 °F 48.2 °F 100% 30.14 in 3.0 mi East 11.5 mph - 0.01 in Rain Light Rain
12:56 AM 48.0 °F 48.0 °F 100% 30.14 in 2.5 mi East 9.2 mph - 0.03 in Rain Light Rain
1:26 AM 48.2 °F 48.2 °F 100% 30.13 in 3.0 mi East 8.1 mph - 0.02 in Rain Light Rain
1:56 AM 48.0 °F 48.0 °F 100% 30.14 in 3.0 mi East 6.9 mph - 0.03 in Rain Light Rain
2:12 AM 48.2 °F 48.2 °F 100% 30.13 in 4.0 mi East 5.8 mph - 0.01 in Rain Light Rain
2:41 AM 48.2 °F 48.2 °F 100% 30.14 in 4.0 mi ESE 5.8 mph - 0.01 in Rain Light Rain
2:56 AM 48.0 °F 48.0 °F 100% 30.13 in 9.0 mi ESE 6.9 mph - 0.01 in   Overcast
3:56 AM 48.9 °F 48.0 °F 97% 30.12 in 10.0 mi ESE 5.8 mph - 0.01 in   Overcast
4:03 AM 48.2 °F 48.2 °F 100% 30.11 in 10.0 mi SE 4.6 mph - N/A   Overcast
4:56 AM 48.9 °F 48.0 °F 97% 30.12 in 10.0 mi NNE 5.8 mph - 0.01 in   Overcast
5:56 AM 48.9 °F 48.0 °F 97% 30.13 in 9.0 mi NE 4.6 mph - 0.01 in   Overcast
6:15 AM 48.2 °F 48.2 °F 100% 30.13 in 10.0 mi ENE 6.9 mph - N/A   Overcast
6:56 AM 50.0 °F 48.9 °F 96% 30.14 in 10.0 mi NE 6.9 mph - N/A   Overcast
7:56 AM 48.9 °F 48.9 °F 100% 30.15 in 6.0 mi NE 9.2 mph - N/A   Overcast
8:39 AM 48.2 °F 46.4 °F 93% 30.16 in 10.0 mi NNE 10.4 mph - N/A   Overcast
8:56 AM 48.0 °F 46.0 °F 93% 30.17 in 10.0 mi NNE 10.4 mph - N/A   Overcast
9:56 AM 48.0 °F 46.0 °F 93% 30.19 in 10.0 mi NNE 6.9 mph - N/A   Overcast
10:56 AM 48.9 °F 46.9 °F 93% 30.19 in 10.0 mi NNE 10.4 mph - N/A   Overcast
12:43 PM 48.2 °F 46.4 °F 93% 30.14 in 10.0 mi NE 4.6 mph - N/A   Overcast
12:56 PM 48.9 °F 46.9 °F 93% 30.14 in 10.0 mi East 5.8 mph - N/A   Overcast
1:56 PM 48.9 °F 46.9 °F 93% 30.13 in 9.0 mi NNE 5.8 mph - N/A   Overcast
2:56 PM 48.9 °F 46.9 °F 93% 30.13 in 10.0 mi NE 10.4 mph - N/A   Overcast
3:56 PM 48.9 °F 46.9 °F 93% 30.13 in 10.0 mi NNE 8.1 mph - N/A   Overcast
4:56 PM 48.9 °F 46.0 °F 90% 30.13 in 10.0 mi NE 3.5 mph - N/A   Overcast
5:56 PM 48.9 °F 46.9 °F 93% 30.12 in 10.0 mi ENE 8.1 mph - N/A   Overcast
6:56 PM 48.0 °F 46.0 °F 93% 30.12 in 9.0 mi NE 13.8 mph - N/A   Overcast
7:56 PM 48.0 °F 46.0 °F 93% 30.11 in 8.0 mi NE 13.8 mph - N/A   Mostly Cloudy
8:56 PM 48.0 °F 46.0 °F 93% 30.11 in 7.0 mi NE 17.3 mph - N/A   Overcast
9:56 PM 48.0 °F 46.0 °F 93% 30.13 in 6.0 mi NE 12.7 mph - N/A   Overcast
10:56 PM 48.0 °F 46.0 °F 93% 30.13 in 8.0 mi NE 11.5 mph - N/A   Overcast
11:56 PM 48.0 °F 45.0 °F 89% 30.12 in 10.0 mi ENE 12.7 mph - N/A   Overcast