San Francisco, CA

7:37 AM PST on February 23, 2017 (GMT -0800)
San Francisco International

Weather History for KSFO - December, 1998

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Tuesday, December 29, 1998

  Actual Average Record
Temperature  
Mean Temperature 46 °F 50 °F  
Max Temperature 52 °F 56 °F 68 °F (2013)
Min Temperature 41 °F 44 °F 33 °F (1988)
Degree Days  
Heating Degree Days 18 15  
Month to date heating degree days 415  
Since 1 July heating degree days 979  
Cooling Degree Days 0 0  
Month to date cooling degree days 0  
Year to date cooling degree days 164  
Moisture  
Dew Point 44 °F    
Average Humidity 96    
Maximum Humidity 100    
Minimum Humidity 77    
Precipitation  
Precipitation 0.01 in 0.14 in 2.60 in (2003)
Month to date precipitation 3.75  
Year to date precipitation 20.37  
Sea Level Pressure  
Sea Level Pressure 30.25 in    
Wind  
Wind Speed 3 mph (East)    
Max Wind Speed 12 mph    
Max Gust Speed -    
Visibility 3 miles    
Events Fog    
T = Trace of Precipitation, MM = Missing Value Source: NWS Daily Summary

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Date:

Astronomy

Dec. 29, 1998 Rise Set
Actual Time 7:23 AM PST 4:59 PM PST
Civil Twilight 6:54 AM PST 5:28 PM PST
Nautical Twilight 6:21 AM PST 6:01 PM PST
Astronomical Twilight 5:49 AM PST 6:33 PM PST
Moon 2:27 PM PST (12/29) 3:23 AM PST (12/29)
Length of Visible Light 10h 34m
Length of Day
9h 35m
Waxing Gibbous, 85% of the Moon is Illuminated
Dec 29
Waxing Gibbous
Jan 1
Full
Jan 9
Last Quarter
Jan 17
New
Jan 24
First Quarter

Hourly Weather History & Observations

Time (PST) Temp. Windchill Dew Point Humidity Pressure Visibility Wind Dir Wind Speed Gust Speed Precip Events Conditions
12:56 AM 41.0 °F - 41.0 °F 100% 30.32 in 0.2 mi Calm Calm - 0.01 in Fog Fog
1:56 AM 42.1 °F - 42.1 °F 100% 30.31 in 0.2 mi Calm Calm - N/A Fog Fog
1:58 AM 42.8 °F - 42.8 °F 100% 30.31 in 0.2 mi Calm Calm - N/A Fog Fog
2:56 AM 43.0 °F 38.2 °F 43.0 °F 100% 30.31 in 0.2 mi NNW 8.1 mph - N/A Fog Fog
3:56 AM 43.0 °F 41.3 °F 43.0 °F 100% 30.30 in 0.2 mi NNW 3.5 mph - N/A Fog Fog
4:56 AM 43.0 °F - 43.0 °F 100% 30.28 in 0.2 mi Calm Calm - N/A Fog Fog
5:56 AM 43.0 °F 41.3 °F 43.0 °F 100% 30.28 in 0.2 mi SE 3.5 mph - N/A Fog Fog
6:56 AM 43.0 °F 40.3 °F 43.0 °F 100% 30.30 in 0.2 mi ESE 4.6 mph - N/A Fog Fog
7:07 AM 42.8 °F - 42.8 °F 100% 30.30 in 0.5 mi Calm Calm - N/A Fog Fog
7:17 AM 42.8 °F 41.1 °F 42.8 °F 100% 30.30 in 1.0 mi ESE 3.5 mph - N/A   Mostly Cloudy
7:26 AM 42.8 °F 41.1 °F 42.8 °F 100% 30.30 in 1.2 mi East 3.5 mph - N/A   Mostly Cloudy
7:48 AM 44.6 °F - 44.6 °F 100% 30.30 in 2.0 mi Calm Calm - N/A   Mostly Cloudy
7:56 AM 43.0 °F - 43.0 °F 100% 30.30 in 2.0 mi Calm Calm - N/A   Mostly Cloudy
8:32 AM 42.8 °F 41.1 °F 42.8 °F 100% 30.30 in 2.0 mi SE 3.5 mph - N/A   Mostly Cloudy
8:56 AM 45.0 °F - 44.1 °F 97% 30.30 in 2.0 mi Calm Calm - N/A   Mostly Cloudy
9:20 AM 44.6 °F - 44.6 °F 100% 30.31 in 1.5 mi Calm Calm - N/A   Mostly Cloudy
9:56 AM 45.0 °F - 44.1 °F 97% 30.31 in 1.0 mi Calm Calm - N/A   Mostly Cloudy
10:23 AM 44.6 °F 42.2 °F 44.6 °F 100% 30.31 in 2.0 mi ENE 4.6 mph - N/A   Mostly Cloudy
10:56 AM 46.0 °F 44.8 °F 45.0 °F 96% 30.31 in 1.5 mi North 3.5 mph - N/A   Mostly Cloudy
11:39 AM 46.4 °F 45.2 °F 44.6 °F 93% 30.29 in 1.8 mi North 3.5 mph - N/A   Scattered Clouds
11:56 AM 46.0 °F 43.9 °F 45.0 °F 96% 30.28 in 1.8 mi ENE 4.6 mph - N/A   Scattered Clouds
12:03 PM 46.4 °F 44.3 °F 44.6 °F 93% 30.27 in 2.0 mi ENE 4.6 mph - N/A   Mostly Cloudy
12:16 PM 46.4 °F 44.3 °F 44.6 °F 93% 30.26 in 2.5 mi East 4.6 mph - N/A   Scattered Clouds
12:56 PM 48.0 °F - 46.0 °F 93% 30.22 in 3.0 mi East 6.9 mph - N/A   Scattered Clouds
1:56 PM 48.9 °F - 46.0 °F 90% 30.20 in 5.0 mi North 3.5 mph - N/A   Clear
2:56 PM 48.9 °F - 46.0 °F 90% 30.17 in 5.0 mi ENE 8.1 mph - N/A   Clear
3:04 PM 48.2 °F - 46.4 °F 93% 30.18 in 1.8 mi East 8.1 mph - N/A   Partly Cloudy
3:07 PM 46.4 °F 42.4 °F 46.4 °F 100% 30.18 in 0.8 mi East 8.1 mph - N/A   Mist
3:12 PM 46.4 °F 42.9 °F 44.6 °F 93% 30.18 in 1.5 mi East 6.9 mph - N/A   Scattered Clouds
3:56 PM 45.0 °F - 45.0 °F 100% 30.17 in 3.0 mi Calm Calm - N/A   Scattered Clouds
4:56 PM 52.0 °F - 45.0 °F 77% 30.15 in 10.0 mi West 8.1 mph - N/A   Scattered Clouds
5:56 PM 50.0 °F - 46.9 °F 89% 30.15 in 10.0 mi West 11.5 mph - N/A   Clear
6:56 PM 48.9 °F - 46.0 °F 90% 30.15 in 10.0 mi West 4.6 mph - N/A   Partly Cloudy
7:56 PM 48.0 °F - 44.1 °F 86% 30.16 in 10.0 mi Calm Calm - N/A   Partly Cloudy
8:56 PM 48.9 °F - 46.9 °F 93% 30.17 in 10.0 mi WSW 4.6 mph - N/A   Clear
9:56 PM 45.0 °F 41.8 °F 43.0 °F 93% 30.16 in 10.0 mi SE 5.8 mph - N/A   Clear
10:56 PM 44.1 °F 40.8 °F 42.1 °F 93% 30.15 in 10.0 mi SE 5.8 mph - N/A   Clear
11:56 PM 45.0 °F 43.5 °F 42.1 °F 90% 30.15 in 10.0 mi SSW 3.5 mph - N/A   Clear