Reporting Station : San Francisco International Airport, CA

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12°C

Clear. Cool.

  • 80%
  • 15 km/hWNW
  • 80%
    Humidity
  • 8°C
    Dew Point
  • 10°C
    Comfort Level
  • 16 km
    Visibility
  • 1014.10 mb

    Barometric Pressure
  • Air Quality
Current Time : 04:26 AM PDT  Refresh Nearest / Estimated
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MAY 21ST, 1860-A swarm of tornadoes occurred in the Ohio Valley. Tornadoes struck the cities of Louisville KY, Cincinnati OH, Chillicothe OH and Marietta OH causing a million dollars damage.

Previously
MAY 21ST, 1860 A swarm of tornadoes occurred in the Ohio Valley. Tornadoes struck the cities of Louisville KY, Cincinnati OH, Chillicothe OH and Marietta OH causing a million dollars damage.
 
MAY 21ST, 1896 The mercury soared to 124 degrees at Salton CA to establish a U.S. record for May.
 
MAY 20TH, 1916 On the same day on this year and again in 1917 and 1918, tornadoes strike Codell, KS.
 
MAY 20TH, 1957 A tornado touched down to the southwest of Kansas City and traveled a distance of seventy-one miles cutting a swath of near total destruction through the southeastern suburbs of Ruskin Heights and Hickman Mills. The tornado claimed the lives of forty-five persons, and left hundreds homeless. It was the worst weather disaster of record for Kansas City. About all that remained of one house was a small table and a fish bowl atop, with the fish still swimming about inside the bowl, rather unconcerned.
 
MAY 19TH, 1955 Lake Maloya NM received 11.28 inches of rain in 24 hours to establish a state record.
 
MAY 19TH, 1780 The infamous "dark day" in New England tradition. At noon it was nearly as dark as night. Chickens went to roost, and many persons were fearful of divine wrath. The phenomena was caused by forest fires to the west of New England.
 
MAY 18TH, 1980 Mount Saint Helens (in Washington State) erupted spewing ash and smoke sixty-three thousand feet into the air. Heavy ash covered the ground to the immediate northwest, and small particles were carried to the Atlantic coast.
 
MAY 18TH, 1825 A tornado (said to have crossed all of the state of Ohio) smashed into the log cabin settlement of Burlington, northeast of Columbus.
 
MAY 17TH, 1883 A three day flood in the Black Hills of western South Dakota resulted in a million dollars damage at Rapid City.
 
MAY 17TH, 1979 A reading of 12 degrees at Mauna Kea Observatory established an all-time record low for the state of Hawaii.
 
MAY 16TH, 1952 High winds in the Wasatch Canyon of Utah struck Ogden and Brigham City. Winds at Hill Air Force Base gusted to 92 mph.
 
Wind Advisory
Issued By NWS Field Office Broadcast Time Mon, 29 Dec 2014 03:43:00 PST
Issuing Time Mon, 29 Dec 2014 03:43:00 PST Valid Until Mon, 29 Dec 2014 03:43:00 PST

Strong northerly winds are forecast to develop across the San Francisco Bay Area by midday Tuesday and continue through midday Wednesday. A strong..cold and dry storm system will sweep into northern and central California late Monday night and Tuesday morning. This system will generate strong and gusty north to northest winds across the region from midday Tuesday through midday Wednesday.

History
Weather Station: San Francisco , CA , US
May Data Choose another month
Averages
Average High Temperature
13.30 °C
Average Low Temperature
7.80 °C
Average Mean Temp
10.60 °C
Average Dew Point
* °C
Average Windspeed
* km/h
Average Wind Direction
*
Average Morning Relative Humidity
*
Average Afternoon Relative Humidity
*
Typical Sky Cover
*
Average Precipitation (US Only)
10.41
Average Snowfall (US Only)
*
Daily Counts
Days With Precipitation
11
Days With Thunderstorms
*
Days With Fog
*
Days With Snow
0
Days With Lows Below Freezing
15
Days above 90° F (32.2° C)
0
Records
Record High
26.10 °C
Record Low
-1.10 °C
Record Wind Speed
-183.30 km/h
Record Monthly Snowfall
* cm
Record 24-hour Snowfall
* cm
Record Monthly Rainfall
272 mm
Record 24-hour Rainfall
81 mm
Record Minimum Monthly Precipitation
1.27 mm
Averages
Average High Temperature
15.60 °C
Average Low Temperature
8.90 °C
Average Mean Temp
12.20 °C
Average Dew Point
* °C
Average Windspeed
* km/h
Average Wind Direction
*
Average Morning Relative Humidity
*
Average Afternoon Relative Humidity
*
Typical Sky Cover
*
Average Precipitation (US Only)
8.88
Average Snowfall (US Only)
*
Daily Counts
Days With Precipitation
10
Days With Thunderstorms
1
Days With Fog
1
Days With Snow
0
Days With Lows Below Freezing
7
Days above 90° F (32.2° C)
0
Records
Record High
27.20 °C
Record Low
-0.60 °C
Record Wind Speed
-183.30 km/h
Record Monthly Snowfall
* cm
Record 24-hour Snowfall
* cm
Record Monthly Rainfall
256 mm
Record 24-hour Rainfall
53 mm
Record Minimum Monthly Precipitation
* mm
Averages
Average High Temperature
16.10 °C
Average Low Temperature
9.40 °C
Average Mean Temp
12.80 °C
Average Dew Point
* °C
Average Windspeed
* km/h
Average Wind Direction
*
Average Morning Relative Humidity
*
Average Afternoon Relative Humidity
*
Typical Sky Cover
*
Average Precipitation (US Only)
7.36
Average Snowfall (US Only)
*
Daily Counts
Days With Precipitation
10
Days With Thunderstorms
*
Days With Fog
0
Days With Snow
0
Days With Lows Below Freezing
4
Days above 90° F (32.2° C)
0
Records
Record High
28.90 °C
Record Low
1.70 °C
Record Wind Speed
-183.30 km/h
Record Monthly Snowfall
* cm
Record 24-hour Snowfall
* cm
Record Monthly Rainfall
228 mm
Record 24-hour Rainfall
63 mm
Record Minimum Monthly Precipitation
* mm
Averages
Average High Temperature
17.20 °C
Average Low Temperature
10.00 °C
Average Mean Temp
13.30 °C
Average Dew Point
* °C
Average Windspeed
* km/h
Average Wind Direction
*
Average Morning Relative Humidity
*
Average Afternoon Relative Humidity
*
Typical Sky Cover
*
Average Precipitation (US Only)
3.81
Average Snowfall (US Only)
0.00
Daily Counts
Days With Precipitation
6
Days With Thunderstorms
1
Days With Fog
0
Days With Snow
0
Days With Lows Below Freezing
2
Days above 90° F (32.2° C)
*
Records
Record High
34.40 °C
Record Low
4.40 °C
Record Wind Speed
16.70 km/h
Record Monthly Snowfall
0.0 cm
Record 24-hour Snowfall
0.00 cm
Record Monthly Rainfall
140 mm
Record 24-hour Rainfall
51 mm
Record Minimum Monthly Precipitation
* mm
Averages
Average High Temperature
17.80 °C
Average Low Temperature
10.60 °C
Average Mean Temp
14.40 °C
Average Dew Point
* °C
Average Windspeed
* km/h
Average Wind Direction
*
Average Morning Relative Humidity
*
Average Afternoon Relative Humidity
*
Typical Sky Cover
*
Average Precipitation (US Only)
1.27
Average Snowfall (US Only)
0.00
Daily Counts
Days With Precipitation
3
Days With Thunderstorms
0
Days With Fog
0
Days With Snow
0
Days With Lows Below Freezing
*
Days above 90° F (32.2° C)
*
Records
Record High
35.60 °C
Record Low
6.70 °C
Record Wind Speed
-183.30 km/h
Record Monthly Snowfall
0.0 cm
Record 24-hour Snowfall
0.00 cm
Record Monthly Rainfall
102 mm
Record 24-hour Rainfall
36 mm
Record Minimum Monthly Precipitation
0.00 mm
Averages
Average High Temperature
18.90 °C
Average Low Temperature
11.70 °C
Average Mean Temp
15.60 °C
Average Dew Point
* °C
Average Windspeed
* km/h
Average Wind Direction
*
Average Morning Relative Humidity
*
Average Afternoon Relative Humidity
*
Typical Sky Cover
*
Average Precipitation (US Only)
0.51
Average Snowfall (US Only)
0.00
Daily Counts
Days With Precipitation
1
Days With Thunderstorms
*
Days With Fog
0
Days With Snow
0
Days With Lows Below Freezing
0
Days above 90° F (32.2° C)
*
Records
Record High
38.30 °C
Record Low
8.30 °C
Record Wind Speed
-183.30 km/h
Record Monthly Snowfall
0.0 cm
Record 24-hour Snowfall
0.00 cm
Record Monthly Rainfall
36 mm
Record 24-hour Rainfall
33 mm
Record Minimum Monthly Precipitation
0.00 mm
Averages
Average High Temperature
18.90 °C
Average Low Temperature
12.20 °C
Average Mean Temp
15.60 °C
Average Dew Point
* °C
Average Windspeed
* km/h
Average Wind Direction
*
Average Morning Relative Humidity
*
Average Afternoon Relative Humidity
*
Typical Sky Cover
*
Average Precipitation (US Only)
*
Average Snowfall (US Only)
0.00
Daily Counts
Days With Precipitation
1
Days With Thunderstorms
1
Days With Fog
0
Days With Snow
0
Days With Lows Below Freezing
0
Days above 90° F (32.2° C)
*
Records
Record High
39.40 °C
Record Low
8.30 °C
Record Wind Speed
-183.30 km/h
Record Monthly Snowfall
0.0 cm
Record 24-hour Snowfall
0.00 cm
Record Monthly Rainfall
5 mm
Record 24-hour Rainfall
3 mm
Record Minimum Monthly Precipitation
0.00 mm
Averages
Average High Temperature
18.90 °C
Average Low Temperature
12.20 °C
Average Mean Temp
16.10 °C
Average Dew Point
* °C
Average Windspeed
* km/h
Average Wind Direction
*
Average Morning Relative Humidity
*
Average Afternoon Relative Humidity
*
Typical Sky Cover
*
Average Precipitation (US Only)
*
Average Snowfall (US Only)
0.00
Daily Counts
Days With Precipitation
1
Days With Thunderstorms
1
Days With Fog
0
Days With Snow
0
Days With Lows Below Freezing
0
Days above 90° F (32.2° C)
*
Records
Record High
35.60 °C
Record Low
8.90 °C
Record Wind Speed
-183.30 km/h
Record Monthly Snowfall
0.0 cm
Record 24-hour Snowfall
0.00 cm
Record Monthly Rainfall
13 mm
Record 24-hour Rainfall
13 mm
Record Minimum Monthly Precipitation
0.00 mm
Averages
Average High Temperature
21.10 °C
Average Low Temperature
13.30 °C
Average Mean Temp
17.20 °C
Average Dew Point
* °C
Average Windspeed
* km/h
Average Wind Direction
*
Average Morning Relative Humidity
*
Average Afternoon Relative Humidity
*
Typical Sky Cover
*
Average Precipitation (US Only)
0.51
Average Snowfall (US Only)
0.00
Daily Counts
Days With Precipitation
1
Days With Thunderstorms
*
Days With Fog
0
Days With Snow
0
Days With Lows Below Freezing
0
Days above 90° F (32.2° C)
1
Records
Record High
38.30 °C
Record Low
8.90 °C
Record Wind Speed
-183.30 km/h
Record Monthly Snowfall
0.0 cm
Record 24-hour Snowfall
0.00 cm
Record Monthly Rainfall
53 mm
Record 24-hour Rainfall
51 mm
Record Minimum Monthly Precipitation
0.00 mm
Averages
Average High Temperature
20.60 °C
Average Low Temperature
12.80 °C
Average Mean Temp
16.70 °C
Average Dew Point
* °C
Average Windspeed
* km/h
Average Wind Direction
*
Average Morning Relative Humidity
*
Average Afternoon Relative Humidity
*
Typical Sky Cover
*
Average Precipitation (US Only)
2.79
Average Snowfall (US Only)
0.00
Daily Counts
Days With Precipitation
4
Days With Thunderstorms
1
Days With Fog
0
Days With Snow
0
Days With Lows Below Freezing
*
Days above 90° F (32.2° C)
*
Records
Record High
38.90 °C
Record Low
6.10 °C
Record Wind Speed
16.70 km/h
Record Monthly Snowfall
0.0 cm
Record 24-hour Snowfall
0.00 cm
Record Monthly Rainfall
140 mm
Record 24-hour Rainfall
58 mm
Record Minimum Monthly Precipitation
* mm
Averages
Average High Temperature
17.80 °C
Average Low Temperature
10.60 °C
Average Mean Temp
14.40 °C
Average Dew Point
* °C
Average Windspeed
* km/h
Average Wind Direction
*
Average Morning Relative Humidity
*
Average Afternoon Relative Humidity
*
Typical Sky Cover
*
Average Precipitation (US Only)
6.60
Average Snowfall (US Only)
0.00
Daily Counts
Days With Precipitation
8
Days With Thunderstorms
*
Days With Fog
0
Days With Snow
0
Days With Lows Below Freezing
1
Days above 90° F (32.2° C)
0
Records
Record High
30.00 °C
Record Low
3.90 °C
Record Wind Speed
-183.30 km/h
Record Monthly Snowfall
0.0 cm
Record 24-hour Snowfall
0.00 cm
Record Monthly Rainfall
208 mm
Record 24-hour Rainfall
63 mm
Record Minimum Monthly Precipitation
0.00 mm
Averages
Average High Temperature
13.90 °C
Average Low Temperature
8.30 °C
Average Mean Temp
11.10 °C
Average Dew Point
* °C
Average Windspeed
* km/h
Average Wind Direction
*
Average Morning Relative Humidity
*
Average Afternoon Relative Humidity
*
Typical Sky Cover
*
Average Precipitation (US Only)
9.90
Average Snowfall (US Only)
*
Daily Counts
Days With Precipitation
10
Days With Thunderstorms
0
Days With Fog
0
Days With Snow
*
Days With Lows Below Freezing
11
Days above 90° F (32.2° C)
0
Records
Record High
24.40 °C
Record Low
-2.80 °C
Record Wind Speed
16.70 km/h
Record Monthly Snowfall
2.5 cm
Record 24-hour Snowfall
2.50 cm
Record Monthly Rainfall
292 mm
Record 24-hour Rainfall
79 mm
Record Minimum Monthly Precipitation
0.00 mm
Day   Reason Upper Soil Moisture Lower Soil Moisture
Tuesday cw_fire_low
Fire danger low 22% 29%
Wednesday cw_fire_moderate
Fire danger moderate 22% 29%
Thursday cw_fire_moderate
Fire danger moderate 22% 29%
Friday cw_fire_moderate
Fire danger moderate 22% 29%
Saturday cw_fire_moderate
Fire danger moderate 22% 29%
Sunday cw_fire_moderate
Fire danger moderate 22% 29%
Snow conditions provided by SnoCountry Mountain Reports™

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